Portable LIBS composition analyzer
阅读说明:本技术 便携式libs成分分析仪 (Portable LIBS composition analyzer ) 是由 李阔湖 姬鹏飞 卫亚博 房坤 代克杰 王宇尧 杜豪杰 赵换丽 于 2019-12-13 设计创作,主要内容包括:本发明涉及一种便携式LIBS成分分析仪;该分析仪含有通过电缆连接在一起的主机箱和手持采集头,主机箱的箱体内设有控制电路和激光器的控制模块,手持采集头的机壳内设置有激光器的激光头﹑聚焦透镜﹑光采集器﹑光谱仪﹑活动平台﹑滑轨﹑微调装置和三个激光位移传感器;滑轨安装在机壳的内下壁上,活动平台通过其底部在滑轨上前后移动,激光头安装在活动平台的上表面,微调装置设置在机壳的内壁和激光头之间,激光位移传感器位于激光头发射口的四周,聚焦透镜位于激光头发射口的前方,光采集器位于激光头的一侧,机壳的前端面中部开有检测窗口;本发明克服了现有技术中因操作者手抖等因素引起检测条件变化的缺陷,减小了检测误差。(The invention relates to a portable LIBS composition analyzer; the analyzer comprises a main case and a handheld collecting head which are connected together through a cable, wherein a control circuit and a control module of a laser are arranged in the case of the main case, and a laser head, a focusing lens, an optical collector, a spectrometer, a movable platform, a sliding rail, a fine adjustment device and three laser displacement sensors of the laser are arranged in a shell of the handheld collecting head; the laser displacement sensor is positioned around the emitting opening of the laser head, the focusing lens is positioned in front of the emitting opening of the laser head, the light collector is positioned at one side of the laser head, and the middle part of the front end surface of the casing is provided with a detection window; the invention overcomes the defect of detection condition change caused by factors such as hand trembling of an operator and the like in the prior art, and reduces detection errors.)
1. A portable LIBS composition analyzer is characterized in that: the handheld collecting head comprises a casing, a laser head, a focusing lens, an optical collector, a spectrometer, a movable platform, a slide rail, an up-down fine adjustment device, a left-right fine adjustment device, a front-back fine adjustment device and three same laser displacement sensors, wherein the casing is internally provided with a box body; the laser for LIBS component analysis is emitted from an emitting port at the front end of a laser head, a horizontally arranged slide rail is fixedly arranged on the inner lower wall of a machine shell, the bottom of a movable platform is connected with the slide rail in a sliding way, the movable platform moves back and forth on the slide rail through the bottom of the movable platform, the laser head is fixedly arranged on the upper surface of the movable platform, two ends of an upper fine adjustment device and a lower fine adjustment device are respectively and fixedly connected with the inner upper wall of the machine shell and the upper side surface of the laser head through universal joints, two ends of a left fine adjustment device and a right fine adjustment device are respectively and fixedly connected with the inner left wall of the machine shell and the left side surface of the laser head through universal joints or two ends of the left fine adjustment device and the right fine adjustment device are respectively and fixedly connected with the inner front wall of the machine shell and the front side surface at the bottom of the movable platform or two ends of the front fine adjustment device and the rear, the laser displacement sensors are fixedly arranged in front of the laser head through a support, the support is fixedly connected with the upper surface of the movable platform, the three laser displacement sensors are positioned around the emission port of the laser head and are uniformly distributed around the central axis of the emission port of the laser head, and the emission ports of the three laser displacement sensors are arranged forwards; the upper fine adjustment device, the lower fine adjustment device, the left fine adjustment device, the right fine adjustment device and the front fine adjustment device and the rear fine adjustment device are fine adjustment devices with the same structure, each fine adjustment device comprises a cylindrical shell, one end of each cylindrical shell is closed, a through hole is formed in the middle of the end face of the other end of each cylindrical shell, a piezoelectric ceramic block, a stop block and a compression spring with inverse piezoelectric effect are sequentially installed in each cylindrical shell from the closed end of each cylindrical shell, a first connecting rod extends outwards from the closed end of each cylindrical shell, a second connecting rod extends out of the surface, in contact with the compression spring, of each stop block, and sequentially penetrates out of the compression spring and the through holes in the end face of each cylindrical shell, and the end parts of each first connecting rod and; the focusing lens, the light collector and the spectrometer are all arranged on the movable platform, the focusing lens is positioned in front of an emission port of the laser head, a main optical axis of the focusing lens is superposed with the central axis of the emission port of the laser head, the light collector is positioned at one side of the laser head, a receiving port of the light collector faces towards the inner front, laser emitted from the emission port of the laser head is converged at or near the objective lens focus of the receiving port of the light collector after passing through the focusing lens, the main optical axis of the focusing lens passes through the objective lens focus of the receiving port of the light collector, and the objective lens focus of the receiving port of the light collector is positioned on a plane where the front end face of the shell is positioned; the front end face of the machine shell is a plane perpendicular to the central axis of the emitting port of the laser head, the middle part of the front end face of the machine shell is provided with a detection window, lasers emitted by the laser head and the three laser displacement sensors are all emitted out of the detection window, light received by the receiving port of the light collector enters from the detection window, the front end face of the machine shell is provided with a laser protection switch, when the laser protection switch is pressed down, the surface of the laser protection switch and the front end face of the machine shell are positioned on the same plane, and the outer side face of the machine shell is provided with a laser light-emitting indicator; a handle is arranged on the outer bottom surface of the shell, and a trigger switch is arranged on the handle; the laser protection switch and the trigger switch are connected in series and then connected to a light-out/light-off control signal interface of the control module through a communication cable, a light-out indicator lamp of a laser is connected with a signal output end of an indicator lamp of the control module through the communication cable, a trigger signal output end of the control module is connected with an external trigger signal input end of a spectrometer through the communication cable, an output optical fiber interface of an optical collector is connected with an input optical fiber interface of the spectrometer, a detection signal output port of the spectrometer is connected with a spectrum detection signal input port of the control circuit through the communication cable, three laser displacement sensors are connected with a position signal input port of the control circuit through the communication cable, an upper fine adjustment device, a lower fine adjustment device, a left fine adjustment device, a right fine adjustment device and a piezoelectric ceramic block in the front fine adjustment device and the rear fine adjustment device are connected with an output port, a laser output control port of the control module is connected with the laser head through a communication cable; the laser protection switch and the trigger switch are both lock-free button switches.
2. The portable LIBS composition analyzer of claim 1, wherein: the movable platform comprises a base, a vertical rotating shaft and a platform supporting plate, wherein a sliding groove matched with the sliding rail is formed in the bottom surface of the base, the base is connected with the sliding rail in a sliding mode through the sliding groove, a round hole is formed in the upper surface of the base, the lower end of the vertical rotating shaft is installed in the round hole through a bearing, the upper end of the vertical rotating shaft is hinged to the middle of the lower surface of the platform supporting plate through a hinge shaft, the hinge shaft is horizontally arranged along the left-right direction, and the platform supporting plate rotates; two ends of the front and rear fine tuning devices are respectively fixedly connected with the inner front wall of the machine shell and the front side surface of the movable platform base or two ends of the front and rear fine tuning devices are respectively fixedly connected with the inner rear wall of the machine shell and the rear side surface of the movable platform base; the laser head and the bracket are fixedly arranged on the upper surface of the platform supporting plate, and the connecting parts of the laser head, the upper fine adjustment device, the lower fine adjustment device and the left fine adjustment device and the right fine adjustment device are positioned at the front part of the movable platform; a diaphragm is arranged between the laser head emission opening and the focusing lens, and the central axis of the diaphragm is superposed with the central axis of the laser head emission opening.
3. The portable LIBS composition analyzer of claim 2, wherein: the sliding groove is a dovetail groove, and the sliding rail is a dovetail-shaped sliding rail matched with the sliding groove; the focusing lens is arranged on the upper surface of the platform supporting plate through the lens bracket; the diaphragm is arranged on the upper surface of the platform supporting plate through the diaphragm bracket; the light collector is arranged on the lower surface of the platform supporting plate through a light collector bracket and is positioned on one side in front of the laser head emission port; the spectrometer is directly arranged on the lower surface of the platform supporting plate; the handle is of a combined hollow structure, the handle comprises a left half part and a right half part, and a connecting lead on the trigger switch sequentially penetrates through a vertical through hole on the bottom surface of the machine shell and a transverse groove on the bottom surface of the slide rail from the inside of the handle, enters the machine shell and is connected with the laser protection switch; the machine shell is of a combined structure and comprises a left shell and a right shell, and the sliding rail, the up-down fine adjustment device, the left-right fine adjustment device and the front-back fine adjustment device are all fixed on the inner wall of the right shell; the outer side of the trigger switch is surrounded by a trigger guard ring, one end of the trigger guard ring is connected to the front side surface of the handle, and the other end of the trigger guard ring is connected to the outer bottom surface of the shell.
4. The portable LIBS composition analyzer of claim 2, wherein: the support contains the ring of fixing in laser head the place ahead, and the central axis of ring and the coincidence of laser head transmission mouth, the upper surface fixed connection of bracing piece and platform backup pad is passed through to the lower part of ring, and the periphery of ring outwards evenly stretches out three the same installation pole, and three laser displacement sensor installs respectively on three installation pole, and the center of three laser displacement sensor is located same perpendicular to laser head transmission mouth the plane of central axis.
5. The portable LIBS composition analyzer of claim 4, wherein the central axes of the emission ports of the three laser displacement sensors intersect at a point on the central axis of the emission port of the laser head, and the included angles between the central axes of the emission ports of the three laser displacement sensors and the central axis of the emission port of the laser head are both α degrees and less than 25 degrees.
6. The portable LIBS composition analyzer as claimed in claim 5, wherein the three laser displacement sensors are respectively mounted on the side surfaces of the three mounting rods by three fastening bolts, and the size of the included angle α is adjusted by the fastening bolts.
7. The portable LIBS composition analyzer of claim 2, wherein: the laser head is the cylindricality, and the laser head is transversely fixed mounting on the upper surface of platform backup pad through the fastening hoop on it, and the fastening hoop is located the front portion of platform backup pad, and fine setting device is through the side fixed connection that goes up of fastening hoop and laser head about, also through fastening hoop and the left surface or the right flank fixed connection of laser head about fine setting device.
8. The portable LIBS composition analyzer of claim 1, wherein: the control circuit comprises a microcomputer, a battery pack, a starting button, three signal converters, three piezoelectric controllers, a piezoelectric control USB concentrator and a power supply, signal output ports of three laser displacement sensors are respectively connected with position signal input ports of the microcomputer through the three signal converters, a position adjusting signal output port of the microcomputer is connected with input ports of the piezoelectric control USB concentrator and the power supply, three output ports of the piezoelectric control USB concentrator and the power supply are respectively connected with upper and lower fine tuning devices, left and right fine tuning devices and piezoelectric ceramic blocks in the front and rear fine tuning devices through the three piezoelectric controllers, a detection signal output port of a spectrometer is connected with a spectrum detection signal input port of the microcomputer, a control signal input port of a control module of the laser is connected with a laser control signal output port of the microcomputer, and the battery pack gives the microcomputer, the control module of the laser, the three laser displacement sensors and the power supply through the starting button The piezoelectric control USB concentrator and the power supply; the laser is a miniature laser, and the spectrometer is a miniature spectrometer.
9. The portable LIBS composition analyzer of claim 8, wherein: the type of the laser is as follows: DPS-1064-mini; the laser displacement sensor has the following types: under pine HL-G108-S-J; the types of the piezoelectric ceramic blocks are as follows: PC4QR form of thralabs; the types of the piezoelectric controller are as follows: type KPZ101 of Throlabs; the piezoelectric control USB concentrator and the power supply are of the following types: (ii) the KCH301 form of thralabs; the universal joint is a spherical universal joint; the spectrometer has the following model: Avaspec-Mini2048-UVI 10; the front part of the shell is in a frustum shape; the signal converter is a USB-RS-422/485 converter, the signal output port of the laser displacement sensor is an RS-422 interface or an RS-485 interface, and the position signal input port of the microcomputer is a USB interface.
10. The portable LIBS composition analyzer of claim 8, wherein: the box body comprises an upper cover and a lower box body, a display of a microcomputer is mounted on the inner top surface of the upper cover, a host, a battery pack, three piezoelectric controllers, a piezoelectric control USB concentrator and a power supply of the microcomputer are mounted in an interlayer of the bottom surface of the lower box body, a starting button is mounted on the upper portion of the inner side surface of the lower box body, a connecting cable between the upper cover and the lower box body penetrates out of the upper cover and then enters the interlayer of the bottom surface of the lower box body from the inner side wall of the lower box body, and a communication cable between the host box and a handheld collecting head penetrates out of the inner bottom surface of the lower box body and then enters the casing from a threading hole in the rear portion of the casing.
The technical field is as follows:
the invention relates to a LIBS component analyzer, in particular to a portable LIBS component analyzer.
(II) background art:
the Laser Induced Breakdown Spectroscopy (LIBS) technique is an atomic emission Spectroscopy technique in which a sample is ablated by high-intensity pulsed Laser to excite plasma, and the collected plasma optical signals are analyzed by a spectrometer to obtain the types and contents of elements contained in the sample. The LIBS technology has great application potential in the fields of metallurgy, environmental monitoring, deep sea exploration, cultural relic identification, space exploration, energy development and the like.
The LIBS technology is very convenient for processing samples, can be used in laboratories as a new material identification and quantitative analysis technology, can also be used in industrial fields or on-line detection, and does not need to sample the samples to the laboratories for long-time preparation and analysis, so that the analysis technology is greatly expanded from the laboratory field to the outdoor, field and even production process. While a portable LIBS composition analyzer can achieve this advantage very well.
However, the portable LIBS component analyzer adopts a handheld collecting head to collect data, the hand shakes due to physiological factors such as respiration and heartbeat of a person, the surfaces of many samples are not standard planes, the situation is complex, the shaking cannot be completely avoided even if the front end surface of the collecting head is abutted against the surfaces of the samples for detection, the shaking can cause the distance between a lens and the samples and the change of the analysis conditions of the angles of light beams and the surfaces of the samples, the consistency of the detection and analysis conditions of the same sample for multiple times is difficult to ensure, the quality of collected data can be reduced, the analysis error can be caused, the analysis performance of the analyzer can be reduced, and the application and the full display of the detection capability of the LIBS in-site and field occasions can be limited.
(III) the invention content:
the technical problem to be solved by the invention is as follows: the portable LIBS component analyzer overcomes the defect that detection conditions change due to factors such as hand shaking of an operator in the working process of the conventional portable LIBS component analyzer, reduces detection errors and has better performance.
The technical scheme of the invention is as follows:
a portable LIBS composition analyzer comprises a main case and a handheld collecting head, wherein the main case comprises a case body, a control circuit and a control module of a laser are arranged in the case body, the handheld collecting head comprises a machine shell, a laser head, a focusing lens, an optical collector, a spectrometer, a movable platform, a sliding rail, an up-down fine adjustment device, a left-right fine adjustment device, a front-back fine adjustment device and three same laser displacement sensors are arranged in the machine shell, and the handheld collecting head is connected with the main case through a communication cable; the laser for LIBS component analysis is emitted from an emitting port at the front end of a laser head, a horizontally arranged slide rail is fixedly arranged on the inner lower wall of a machine shell, the bottom of a movable platform is connected with the slide rail in a sliding way, the movable platform moves back and forth on the slide rail through the bottom of the movable platform, the laser head is fixedly arranged on the upper surface of the movable platform, two ends of an upper fine adjustment device and a lower fine adjustment device are respectively and fixedly connected with the inner upper wall of the machine shell and the upper side surface of the laser head through universal joints, two ends of a left fine adjustment device and a right fine adjustment device are respectively and fixedly connected with the inner left wall of the machine shell and the left side surface of the laser head through universal joints or two ends of the left fine adjustment device and the right fine adjustment device are respectively and fixedly connected with the inner front wall of the machine shell and the front side surface at the bottom of the movable platform or two ends of the front fine adjustment device and the rear, the laser displacement sensors are fixedly arranged in front of the laser head through a support, the support is fixedly connected with the upper surface of the movable platform, the three laser displacement sensors are positioned around the emission port of the laser head and are uniformly distributed around the central axis of the emission port of the laser head, and the emission ports of the three laser displacement sensors are arranged forwards; the upper fine adjustment device, the lower fine adjustment device, the left fine adjustment device, the right fine adjustment device and the front fine adjustment device and the rear fine adjustment device are fine adjustment devices with the same structure, each fine adjustment device comprises a cylindrical shell, one end of each cylindrical shell is closed, a through hole is formed in the middle of the end face of the other end of each cylindrical shell, a piezoelectric ceramic block, a stop block and a compression spring with inverse piezoelectric effect are sequentially installed in each cylindrical shell from the closed end of each cylindrical shell, a first connecting rod extends outwards from the closed end of each cylindrical shell, a second connecting rod extends out of the surface, in contact with the compression spring, of each stop block, and sequentially penetrates out of the compression spring and the through holes in the end face of each cylindrical shell, and the end parts of each first connecting rod and; the focusing lens, the light collector and the spectrometer are all arranged on the movable platform, the focusing lens is positioned in front of an emission port of the laser head, a main optical axis of the focusing lens is superposed with the central axis of the emission port of the laser head, the light collector is positioned at one side of the laser head, a receiving port of the light collector faces towards the inner front, laser emitted from the emission port of the laser head is converged at or near the objective lens focus of the receiving port of the light collector after passing through the focusing lens, the main optical axis of the focusing lens passes through the objective lens focus of the receiving port of the light collector, and the objective lens focus of the receiving port of the light collector is positioned on a plane where the front end face of the shell is positioned; the front end face of the machine shell is a plane perpendicular to the central axis of the emitting port of the laser head, the middle part of the front end face of the machine shell is provided with a detection window, lasers emitted by the laser head and the three laser displacement sensors are all emitted out of the detection window, light received by the receiving port of the light collector enters from the detection window, the front end face of the machine shell is provided with a laser protection switch, when the laser protection switch is pressed down, the surface of the laser protection switch and the front end face of the machine shell are positioned on the same plane, and the outer side face of the machine shell is provided with a laser light-emitting indicator; a handle is arranged on the outer bottom surface of the shell, and a trigger switch is arranged on the handle; the laser protection switch and the trigger switch are connected in series and then connected to a light-out/light-off control signal interface of the control module through a communication cable, a light-out indicator lamp of the laser is connected with a signal output end of an indicator lamp of the control module through the communication cable, a trigger signal output end of the control module is connected with an external trigger signal input end of the spectrometer through the communication cable so as to control the signal acquisition time sequence of the spectrometer, an output optical fiber interface of the light collector is connected with an input optical fiber interface of the spectrometer, a detection signal output port of the spectrometer is connected with a spectrum detection signal input port of the control circuit through the communication cable, three laser displacement sensors are connected with a position signal input port of the control circuit through the communication cable, an upper fine adjustment device, a lower fine adjustment device, a left fine adjustment device, a right fine adjustment device and a piezoelectric ceramic block in, the power input end of the control module is connected with the power output end of the control circuit, and the laser output control port of the control module is connected with the laser head through a communication cable; the laser protection switch and the trigger switch are both lock-free button switches, and the laser light-emitting indicator lamp is an LED lamp.
The three laser displacement sensors detect the distance from a focusing lens to a sample and the angle of a laser axis relative to the surface of the sample by measuring the distance between the three laser displacement sensors and the surface of the sample, signals detected by the three laser displacement sensors are input into the control circuit, the control circuit judges the up-down, left-right and front-back postures of the laser head according to the received signals, if the postures of the laser head are found to be improper, a position adjusting signal is sent out, and the position adjusting signal controls the thicknesses of the piezoelectric ceramic blocks in the up-down fine adjusting device, the left-right fine adjusting device and the front-back fine adjusting device to change, so that the up-down, left-right and front-back postures of the laser head are finely adjusted, and offset generated by the improper postures of the laser head.
When the thickness of the piezoelectric ceramic block is increased, the stop block can be pushed to move towards the compression spring, so that the whole length of the fine adjustment device is increased; when the thickness of the piezoelectric ceramic block is reduced, the compression spring pushes the stop block to move towards the piezoelectric ceramic block, so that the whole length of the fine adjustment device is reduced; the posture of the laser head is adjusted by the three fine-adjustment devices through the length change of the three fine-adjustment devices, so that the laser beams emitted by the laser head are perpendicular to the surface of the sample, and the emitting ports and the surface of the sample keep a fixed distance.
The movable platform comprises a base, a vertical rotating shaft and a platform supporting plate, wherein a sliding groove matched with the sliding rail is formed in the bottom surface of the base, the base is connected with the sliding rail in a sliding mode through the sliding groove, a round hole is formed in the upper surface of the base, the lower end of the vertical rotating shaft is installed in the round hole through a bearing, the upper end of the vertical rotating shaft is hinged to the middle of the lower surface of the platform supporting plate through a hinge shaft, the hinge shaft is horizontally arranged along the left-right direction, and the platform supporting plate; two ends of the front and rear fine tuning devices are respectively fixedly connected with the inner front wall of the machine shell and the front side surface of the movable platform base or two ends of the front and rear fine tuning devices are respectively fixedly connected with the inner rear wall of the machine shell and the rear side surface of the movable platform base; the laser head and the support are fixedly arranged on the upper surface of the platform supporting plate, and the joints of the laser head, the upper fine adjustment device, the lower fine adjustment device and the left fine adjustment device and the right fine adjustment device are positioned at the front part of the movable platform. A diaphragm is arranged between the laser head emission opening and the focusing lens, and the central axis of the diaphragm is superposed with the central axis of the laser head emission opening. The diaphragm can reshape the laser emitted from the emitting opening of the laser head.
The sliding groove is a dovetail groove, and the sliding rail is a dovetail-shaped sliding rail matched with the sliding groove; the focusing lens is arranged on the upper surface of the platform supporting plate through the lens bracket; the diaphragm is arranged on the upper surface of the platform supporting plate through the diaphragm bracket; the light collector is arranged on the lower surface of the platform supporting plate through a light collector bracket and is positioned on one side in front of the laser head emission port; the spectrometer is directly arranged on the lower surface of the platform supporting plate; the handle is of a combined hollow structure, the handle comprises a left half part and a right half part, and a connecting lead on the trigger switch sequentially penetrates through a vertical through hole on the bottom surface of the machine shell and a transverse groove on the bottom surface of the slide rail from the inside of the handle, enters the machine shell and is connected with the laser protection switch; the machine shell is of a combined structure and comprises a left shell and a right shell, and the sliding rail, the up-down fine adjustment device, the left-right fine adjustment device and the front-back fine adjustment device are all fixed on the inner wall of the right shell; the outside of trigger switch has surrounded the trigger protective shroud, and the one end of trigger protective shroud is connected on the leading flank of handle, and the other end of trigger protective shroud is connected on the outer bottom surface of casing, and the trigger protective shroud can prevent that trigger switch from being touched by the mistake.
The support contains the ring of fixing in laser head the place ahead, and the central axis of ring coincides with the central axis of laser head transmission mouth, and the upper surface fixed connection of bracing piece and platform backup pad is passed through to the lower part of ring, and the periphery of ring outwards evenly stretches out three the same installation pole, and three laser displacement sensor installs respectively on three installation pole, and the center of three laser displacement sensor is located same perpendicular to laser head transmission mouth the plane of central axis.
The central axes of the three laser displacement sensor emitting ports intersect at one point on the central axis of the laser head emitting port, and the included angles between the central axes of the three laser displacement sensor emitting ports and the central axis of the laser head emitting port are α < 25 degrees.
Three laser displacement sensor installs respectively on the side of three installation pole through three fastening bolt, adjusts the size of contained angle α through fastening bolt.
The laser head is a column, the laser head is transversely fixedly installed on the upper surface of the platform supporting plate through a fastening hoop on the laser head, the fastening hoop is located in the front of the platform supporting plate, the upper fine adjustment device and the lower fine adjustment device are fixedly connected with the upper side surface of the laser head through the fastening hoop, and the left fine adjustment device and the right fine adjustment device are also fixedly connected with the left side surface or the right side surface of the laser head through the fastening hoop.
The control circuit comprises a microcomputer, a battery pack, a starting button, three signal converters, three piezoelectric controllers, a piezoelectric control USB concentrator and a power supply, signal output ports of three laser displacement sensors are respectively connected with position signal input ports of the microcomputer through the three signal converters, a position adjusting signal output port of the microcomputer is connected with input ports of the piezoelectric control USB concentrator and the power supply, three output ports of the piezoelectric control USB concentrator and the power supply are respectively connected with upper and lower fine tuning devices, left and right fine tuning devices and piezoelectric ceramic blocks in the front and rear fine tuning devices through the three piezoelectric controllers, a detection signal output port of a spectrometer is connected with a spectrum detection signal input port of the microcomputer, a control signal input port of a control module of the laser is connected with a laser control signal output port of the microcomputer, and the battery pack gives the microcomputer, a control module of the laser, three laser displacement sensors and the piezoelectric control USB concentrator through the starting button Controlling the USB concentrator and the power supply, and taking electricity from the microcomputer by the spectrometer through a power supply end on a detection signal output port (such as a USB port); the laser is a miniature laser, and the spectrometer is a miniature spectrometer.
The laser instrument comprises control module and laser head, and the model of laser instrument is: DPS-1064-mini type nanosecond pulse laser in new Changchun industry; the laser displacement sensor has the following types: under pine HL-G108-S-J; the types of the piezoelectric ceramic blocks are as follows: PC4QR form of thralabs; the types of the piezoelectric controller are as follows: type KPZ101 of Throlabs; the piezoelectric control USB concentrator and the power supply are of the following types: (ii) the KCH301 form of thralabs; the universal joint is a spherical universal joint; the spectrometer has the following model: Avaspec-Mini2048-
The box body comprises an upper cover and a lower box body, a display of a microcomputer is mounted on the inner top surface of the upper cover, a host of the microcomputer, a battery pack, a control module of a laser, three piezoelectric controllers, a piezoelectric control USB concentrator and a power supply are mounted in an interlayer on the bottom surface of the lower box body, a starting button is mounted on the upper portion of the inner side surface of the lower box body, a connecting cable between the upper cover and the lower box body penetrates out of the upper cover and then enters the interlayer on the bottom surface of the lower box body from the inner side wall of the lower box body, and a communication cable between the host box and a handheld collecting head penetrates out of the inner bottom surface of the lower box body and then enters the casing from a threading hole in the rear portion of the casing.
The use method of the portable LIBS component analyzer is as follows: the method comprises the steps that firstly, an upper cover of a mainframe box is opened, a starting button is pressed down, a battery pack supplies power to a microcomputer, a control module of a laser, three laser displacement sensors, a piezoelectric control USB concentrator and a power supply, the microcomputer and the laser are in a starting state, the microcomputer supplies power to a spectrometer through a USB data line, and the spectrometer is started. When LIBS analysis is needed, firstly, analysis parameters are set on the microcomputer, then a handle of the handheld collecting head is held by a hand, the front end face of the handheld collecting head is enabled to abut against the surface of a sample (at the moment, the laser protection switch is turned on), detection can be carried out by pulling the trigger switch, a detection analysis result is displayed on a display of the microcomputer, and after the detection is finished, the trigger switch is released, and the handheld collecting head is moved away from the surface of the sample.
Because the laser protection switch and the trigger switch are connected in series, the laser head can emit light only when the laser protection switch and the trigger switch are simultaneously turned on; the laser protection switch is opened only when the front end face of the handheld collecting head abuts against the surface of a sample, and the front end face of the handheld collecting head is disconnected when being separated from the surface of the sample, so that light emitting of the laser head is interrupted, and the risk of laser leakage is avoided.
The laser emits light, and the spectrometer is controlled by the trigger signal line to collect spectrum in reasonable time, and the spectrometer transmits collected spectrum data back to the microcomputer through the data line, and stores and analyzes the data on the microcomputer.
When the LIBS composition analyzer is not used, the handheld collecting head can be placed in the lower box body to be fixed, and then the upper cover is covered on the lower box body. The inner bottom surface of the lower box body can be provided with a pit matched with the handheld collecting head in shape, the handheld collecting head is clamped in the pit, and the starting button can also be arranged on the inner bottom surface of the lower box body.
The invention has the beneficial effects that:
the method comprises the steps that 1, three laser displacement sensors are adopted to detect the distance from an emitting port of a laser head of a laser to the surface of a sample and the angle relative to the surface of the sample, then the actions of an upper fine adjustment device, a lower fine adjustment device, a left fine adjustment device, a right fine adjustment device, a front fine adjustment device and a rear fine adjustment device are controlled through detected information, the posture of the laser head is adjusted in time, the emitting port of the laser head is always kept at a fixed distance from the sample, and emitted laser is perpendicular to the surface of the sample; the invention overcomes the defect of detection condition change caused by hand shake of an operator in the working process of the portable LIBS component analyzer, reduces the error of the component analyzer and ensures that the performance of the component analyzer is better.
2, the piezoelectric ceramic block with the inverse piezoelectric effect is adopted in the fine adjustment device, when the voltage on the piezoelectric ceramic block changes, the thickness of the piezoelectric ceramic block changes slightly, so that the length of the fine adjustment device changes slightly, and the purpose of fine adjustment of the posture of the laser head is achieved.
3, a miniature laser and a miniature spectrometer are adopted in the handheld collecting head, so that the handheld collecting head is small in size and flexible and free to use; the handheld collecting head can be placed in the box body of the mainframe box when not in use, and is convenient to carry; the microcomputer is a tablet personal computer, the tablet personal computer is installed in the upper cover of the mainframe box, when the tablet personal computer is detected, parameters can be set on the touch screen of the tablet personal computer and the result of detection and analysis can be observed by opening the upper cover of the box body, and the tablet personal computer is very convenient to use.
(IV) description of the drawings:
FIG. 1 is a schematic diagram of a portable LIBS composition analyzer;
FIG. 2 is a right side enlarged schematic view of the handheld pick head of FIG. 1;
FIG. 3 is a left side view of the structure of FIG. 2 (with the left housing of the housing and the left half of the handle removed);
FIG. 4 is a schematic sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of the structure of FIG. 2 with the frustoconical front portion of the housing removed;
fig. 6 is a schematic circuit diagram of the control circuit.
(V) detailed embodiment:
referring to fig. 1 to 6, in the drawings, the portable LIBS composition analyzer includes a main chassis and a handheld pick-up head, the main chassis includes a chassis body, a control circuit and a control module of a laser are disposed in the chassis body, the handheld pick-up head includes a
The three
When the thickness of the piezoelectric
The movable platform comprises a
The sliding
The
The central axes of the three
The three
The
The control circuit comprises a microcomputer, a battery pack, a start-
The laser instrument comprises control module and
The case body comprises an
The use method of the portable LIBS component analyzer is as follows: first, the
Because the
The laser emits light and controls the
When the LIBS analyzer is not used, the hand-held pick head can be placed in the
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