阅读说明：本技术 激光光声光谱在线质量分析仪表 (Laser photoacoustic spectrum on-line quality analysis instrument ) 是由 周泽龙 于 2019-09-25 设计创作，主要内容包括：本发明公开了一种激光光声光谱在线质量分析仪表,包括激光光声光谱传感单元、MCU主控单元、人机接口触摸屏、显示屏以及经验方案制定和质量决策选择单元,激光光声光谱传感单元将激光照射的油品介质通过光声效应产生的声频信号转换为电信号,MCU主控单元对电信号进行数值运算处理,与经验和品质特征进行比对,分析油品的特征元素的定性和量值的含量,得出油品的该项成分值和质量状况,把分析结果发送给显示屏和经验方案制定和质量决策选择单元,经验方案制定和质量决策选择单元找出纠正质量的最佳方案实时提供给工艺技术人员,或反馈到控制质量的调节回路进行调节闭环控制。本发明可以同时测量多种油品成分、能降低测量成本、提高测量效率。(The invention discloses a laser photoacoustic spectrum online quality analysis instrument, which comprises a laser photoacoustic spectrum sensing unit, an MCU (micro control unit), a man-machine interface touch screen, a display screen and an experience scheme making and quality decision selecting unit, wherein the laser photoacoustic spectrum sensing unit converts an audio signal generated by an oil medium irradiated by laser through a photoacoustic effect into an electric signal, the MCU carries out numerical operation processing on the electric signal, and comparing the quality information with experience and quality characteristics, analyzing the qualitative and quantity content of the characteristic elements of the oil product to obtain the component value and the quality condition of the oil product, sending the analysis result to a display screen and an experience scheme making and quality decision selecting unit, and finding out the optimal scheme for correcting the quality by the experience scheme making and quality decision selecting unit and providing the optimal scheme for a process technician in real time or feeding the optimal scheme back to a regulating loop for controlling the quality to carry out regulating closed-loop control. The invention can simultaneously measure various oil components, reduce the measurement cost and improve the measurement efficiency.)

1. The laser photoacoustic spectroscopy online quality analysis instrument is characterized by comprising a laser photoacoustic spectroscopy sensing unit, an MCU (micro control unit) main control unit, a human-computer interface touch screen, a display screen and an experience scheme making and quality decision selecting unit, wherein the laser photoacoustic spectroscopy sensing unit converts an audio signal generated by a laser-irradiated oil medium through a photoacoustic effect into an electric signal and sends the electric signal to the MCU main control unit, the MCU main control unit performs numerical operation on the electric signal and compares the electric signal with experience and quality characteristics to analyze the qualitative and quantity values of characteristic elements of an oil product and obtain the component value and quality condition of the oil product, and simultaneously sends an analysis result to the display screen and the experience scheme making and quality decision selecting unit, and the optimal scheme for finding out quality correction is provided for process technicians in real time through the experience scheme making and the quality decision selecting unit, or the human-computer interface touch screen is fed back to various quality control regulation loops to carry out regulation closed-loop control, and the human-computer interface touch screen is connected with the MCU main control unit and is used for realizing parameter setting, database input and scheme modification and change.

2. The laser photoacoustic spectrometry on-line quality analysis instrument according to claim 1, wherein the laser photoacoustic spectrometry sensing unit comprises a laser, an acoustic detection sensor, a pre-positioned signal processor with isolation, a microprocessor, a signal-to-digital-quantity communication interface and an isolation micro-power supply, the laser is connected with the pre-positioned signal processor with isolation through the acoustic detection sensor, the microprocessor is respectively connected with the pre-positioned signal processor with isolation and the signal-to-digital-quantity communication interface, and the isolation micro-power supply is connected with the pre-positioned signal processor with isolation.

3. The laser photoacoustic spectrometry on-line quality analysis instrument according to claim 2, wherein the two ends of the laser photoacoustic spectrometry sensing unit are provided with standard pipe joints.

4. The laser photoacoustic spectrometry on-line quality analyzer as claimed in claim 1, wherein the MCU master control unit comprises a DSP processor.

5. The laser photoacoustic spectrometry on-line quality analyzer as set forth in claim 1, wherein the empirical scheme making and quality decision selecting unit comprises a remote host computer.

6. The laser photoacoustic spectrometry on-line quality analyzer as claimed in any one of claims 1 to 5, further comprising a power supply module, wherein the power supply module is connected to the MCU master control unit, the power supply module comprises a first inductor, a first capacitor, a first resistor, a second inductor, a first triode, a second capacitor, a second resistor, a third resistor, a fourth resistor, a DC power supply, a second triode and a voltage output terminal, one end of the first inductor is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the first resistor, the base of the first triode and one end of the fourth resistor, the collector of the first triode is connected to one end of the second inductor, one end of the second capacitor, one end of the second resistor and the voltage output terminal, the other end of the first resistor is connected to the other end of the second inductor and the DC power supply, the other end of the second resistor is connected with one end of the third resistor and the base electrode of the second triode respectively, the collector electrode of the second triode is connected with the other end of the fourth resistor, the other end of the first inductor, the emitter electrode of the first triode, the other end of the second capacitor, the other end of the third resistor and the emitter electrode of the second triode are all grounded, and the resistance value of the fourth resistor is 36k omega.

7. The laser photoacoustic spectrometry on-line quality analyzer as claimed in claim 6, wherein the power supply module further comprises a first diode, the anode of the first diode is connected to the emitter of the second triode, the cathode of the first diode is grounded, and the first diode is S-272T in type.

8. The laser photoacoustic spectrometry on-line quality analyzer as claimed in claim 6, wherein the first transistor is an NPN transistor.

9. The laser photoacoustic spectrometry on-line quality analyzer as claimed in claim 6, wherein the second transistor is an NPN transistor.

Technical Field

The invention relates to the field of online quality analysis instruments, in particular to an online quality analysis instrument based on laser photoacoustic spectroscopy.

Background

At present, online quality instruments are widely applied, for example, the petrochemical industry is used for monitoring the quality of produced gasoline, the conventional method is manual sampling, then analysis is carried out in a laboratory, the analysis result is informed to a production process department for adjustment, the process is long, some unqualified products can be generated in the process, and some physical online analysis devices or other online analyzers are all used for measuring only one oil product component, when various oil product components need to be measured, a plurality of devices are needed, so that the measurement cost is high, and the measurement efficiency is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of providing a laser photoacoustic spectroscopy online quality analysis instrument which can simultaneously measure various oil product components, reduce the measurement cost and improve the measurement efficiency aiming at the defects in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a laser photoacoustic spectroscopy online quality analysis instrument is constructed and comprises a laser photoacoustic spectroscopy sensing unit, an MCU (microprogrammed control unit), a human-computer interface touch screen, a display screen and an experience scheme making and quality decision selecting unit, wherein the laser photoacoustic spectroscopy sensing unit converts an audio signal generated by a laser-irradiated oil medium through a photoacoustic effect into an electric signal and sends the electric signal to the MCU main control unit, the MCU main control unit performs numerical operation on the electric signal and compares the electric signal with experience and quality characteristics to analyze the content of characteristic elements and quantity values of the oil to obtain the qualitative and quality conditions of the oil, and simultaneously sends an analysis result to the display screen and the experience scheme making and quality decision selecting unit, and the optimal scheme for correcting the quality is found out through the experience scheme making and quality decision selecting unit and is provided to process technicians in real time, or the human-computer interface touch screen is fed back to various quality control regulation loops to carry out regulation closed-loop control, and the human-computer interface touch screen is connected with the MCU main control unit and is used for realizing parameter setting, database input and scheme modification and change.

In the online quality analysis instrument for laser photoacoustic spectroscopy, the laser photoacoustic spectroscopy sensing unit comprises a laser, a sound detection sensor, a preposed signal processor with isolation, a microprocessor, a signal digital quantity communication interface and an isolation micro power supply, wherein the laser is connected with the preposed signal processor with isolation through the sound detection sensor, the microprocessor is respectively connected with the preposed signal processor with isolation and the signal digital quantity communication interface, and the isolation micro power supply is connected with the preposed signal processor with isolation.

In the laser photoacoustic spectrum online quality analysis instrument, the two ends of the laser photoacoustic spectrum sensing unit are provided with standard pipe joints.

In the laser photoacoustic spectrometry online quality analysis instrument, the MCU main control unit comprises a DSP processor.

In the laser photoacoustic spectroscopy online quality analysis instrument, the empirical scheme making and quality decision selecting unit comprises a remote upper computer.

The laser photoacoustic spectrometry online quality analysis instrument further comprises a power supply module, wherein the power supply module is connected with the MCU main control unit and comprises a first inductor, a first capacitor, a first resistor, a second inductor, a first triode, a second capacitor, a second resistor, a third resistor, a fourth resistor, a direct current power supply, a second triode and a voltage output end, one end of the first inductor is connected with one end of the first capacitor, the other end of the first capacitor is respectively connected with one end of the first resistor, a base of the first triode and one end of the fourth resistor, a collector of the first triode is respectively connected with one end of the second inductor, one end of the second capacitor, one end of the second resistor and the voltage output end, the other end of the first resistor is respectively connected with the other end of the second inductor and the direct current power supply, the other end of the second resistor is connected with one end of the third resistor and the base electrode of the second triode respectively, the collector electrode of the second triode is connected with the other end of the fourth resistor, the other end of the first inductor, the emitter electrode of the first triode, the other end of the second capacitor, the other end of the third resistor and the emitter electrode of the second triode are all grounded, and the resistance value of the fourth resistor is 36k omega.

In the online quality analysis instrument for laser photoacoustic spectroscopy, the power supply module further comprises a first diode, the anode of the first diode is connected with the emitter of the second triode, the cathode of the first diode is grounded, and the type of the first diode is S-272T.

In the online quality analysis instrument for laser photoacoustic spectroscopy, the first triode is an NPN triode.

in the online quality analysis instrument for laser photoacoustic spectroscopy, the second triode is an NPN triode.

the laser photoacoustic spectrum online quality analysis instrument has the following beneficial effects: because the online quality analysis instrument is provided with the laser photoacoustic spectrum sensing unit, the MCU main control unit, the human-computer interface touch screen, the display screen and the experience scheme making and quality decision selecting unit, the laser photoacoustic spectrum sensing unit converts an audio signal generated by an oil medium irradiated by laser through a photoacoustic effect into an electric signal, the MCU main control unit performs numerical operation on the electric signal and compares the electric signal with experience and quality characteristics to analyze the qualitative and quantity content of characteristic elements of the oil to obtain the component value and the quality condition of the oil, the analysis result is sent to the experience scheme making and quality decision selecting unit, the optimal scheme for correcting the quality is found out and provided for process technicians in real time, or is fed back to adjusting loops of various control qualities to adjust closed-loop control, one online quality analysis instrument of the laser photoacoustic spectrum in the invention is equivalent to a plurality of different online quality analysis instruments in the traditional technology, the invention can simultaneously measure various oil components, reduce the measurement cost and improve the measurement efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of an on-line mass spectrometer of the present invention using laser photoacoustic spectroscopy;

FIG. 2 is a working schematic diagram of the laser photoacoustic spectroscopy online quality analysis instrument in the embodiment;

Fig. 3 is a schematic circuit diagram of the power supply module in the embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the embodiment of the laser photoacoustic spectrometry online mass analyzer of the present invention, a schematic structural diagram of the laser photoacoustic spectrometry online mass analyzer is shown in fig. 1. In fig. 1, the laser photoacoustic spectroscopy online quality analysis instrument comprises a laser photoacoustic spectroscopy sensing unit 1, an MCU main control unit 2, a human-computer interface touch screen 3, a display screen 4 and an experience scheme making and quality decision selecting unit 5, wherein the laser photoacoustic spectroscopy sensing unit 1 converts an audio signal generated by a laser-irradiated oil medium through a photoacoustic effect into an electrical signal and transmits the electrical signal to the MCU main control unit 2, the MCU main control unit 2 performs numerical operation on the electrical signal and compares the electrical signal with experience and quality characteristics to analyze qualitative and quantitative values of characteristic elements of the oil product to obtain the component value and quality condition of the oil product, and simultaneously transmits an analysis result to the display screen 4 and the experience scheme making and quality decision selecting unit to find out an optimal scheme for correcting quality through the experience scheme making and quality decision selecting unit and provide the optimal scheme to a process technician in real time, or the data is fed back to various regulating loops for controlling quality to carry out regulating closed-loop control, the display screen 4 can display parameters and states, and the human-computer interface touch screen 3 is connected with the MCU main control unit 2 and used for realizing parameter setting, database input, scheme modification and change and the like. The laser photoacoustic spectrometry online quality analysis instrument is equivalent to a plurality of different quality online quality analysis instruments in the traditional technology, and can simultaneously measure various oil product components, reduce the measurement cost and improve the measurement efficiency.

In this embodiment, the two ends of the laser photoacoustic spectroscopy sensing unit 1 are provided with standard pipe joints. The laser photoacoustic spectrum sensing unit 1 comprises a laser 11, an acoustic detection sensor 12, a preposed signal processor 13 with isolation, a microprocessor 14, a signal digital quantity communication interface 15 and an isolation micro power supply 16, wherein the laser 11 is connected with the preposed signal processor 13 with isolation through the acoustic detection sensor 12, the microprocessor 14 is respectively connected with the preposed signal processor 13 with isolation and the signal digital quantity communication interface 15, and the isolation micro power supply 16 is connected with the preposed signal processor 13 with isolation. The laser photoacoustic spectrum sensing unit 1 is integrated, can utilize photoacoustic effect generated by laser, and then converts the photoacoustic effect into electric signals corresponding to the element characteristics and the amplitude content of oil products to be picked up.

The experience scheme making and quality decision selecting unit 5 comprises a remote upper computer 51, a hardware system for controlling the production process by the configuration computer, an experience and various scheme database, an AI technology for analyzing quality elements, making corresponding scheme decisions, and closed-loop control and production elements for modifying the process.

The MCU main control unit 2 comprises a DSP processor 21 and receives signals from the laser photoacoustic spectrum sensing unit 1, the signals are subjected to numerical operation processing of the DSP processor 21 and are compared with experience and quality characteristics of the laser photoacoustic spectrum sensing unit 1 to analyze qualitative and quantity content of characteristic elements of the oil product, and accordingly the component value and the quality condition of the oil product are obtained. Meanwhile, the analysis result is sent to the display screen 4 and the upper computer 51 at the far end to find out the optimal scheme for correcting the quality, and the optimal scheme is provided for reference for process technicians in real time or fed back to various quality control regulation loops for regulation closed-loop control.

The laser photoacoustic spectrum online quality analyzer utilizes the laser photoacoustic effect to obtain the quality requirement of the oil product to analyze the oil product quality, and achieves the aim that one laser photoacoustic spectrum online quality analyzer achieves the aim of detecting the quality parameters of multiple traditional machines. And comparing with an experience database and a process scheme database to obtain qualitative and quantitative results of the quality of the oil product, and realizing closed-loop regulation of the quality of the oil product by using the scheme database.

The invention transmits the quality data collected from the scene to the upper computer 51 at the far end through the network, the data is further screened and analyzed in the upper computer 51 to obtain the accurate qualitative and quantitative confirmation, the elements of the elements are compared and classified with the mass data stored in the upper computer 51, the elements are collated with the empirical data of the upper computer 51 to find the scheme which accords with the optimal control quality, and the scheme is determined and provided for the technical department of the technology to make the selection of the quality control decision, or directly control and adjust the parameters of the production instrument (the part of the functions also have the functions of the data collection of the scene and the configuration of a closed-loop control circuit), thereby achieving the purpose of correcting the parameters.

Fig. 2 is a working principle diagram of the laser photoacoustic spectroscopy online mass spectrometer in the embodiment. For petrochemical oil products, the following C4, C8, H, O, S, etc. are required to be detected in the oil products, the structural composition of these elements can reflect the quality of the oil products, the differences can determine the properties of the oil products, and the analysis can be performed by a spectral method, such as gas chromatography, etc. The laser photoacoustic spectrum on-line quality analysis instrument is characterized in that a laser photoacoustic spectrum sensing unit 1 arranged on a bypass pipeline is irradiated by laser, an acoustic detection sensor 12 arranged on a pipeline of a passing oil product is used for picking up audio information, the information is related to basic elements (C4, C8 and H, O, S) contained in the oil product, when the picked-up information is displayed on a display screen 4, spectral lines containing the elements represent the characteristics of the elements and the quantity values of the elements, the content of the elements is reflected, the information is analyzed and compared with data defined by experience, characteristics, components and the like of a database, finally, the qualitative performance of the oil product and the content of each index are obtained, the information is sent to a remote upper computer 51 for comparison of schemes, selection control of quality control decision making is carried out, and the information is fed back to a production process regulation quality parameter. Therefore, the purpose of controlling the quality in real time is achieved, basic elements are matched with different oil quality data, the qualitative and quantitative properties of the obtained oil and the obtained oil index are obtained, and the purpose that one laser photoacoustic spectroscopy online quality analyzer achieves the purpose of detecting the quality parameters of a plurality of traditional quality analyzers is achieved.

In this embodiment, the laser photoacoustic spectroscopy online quality analysis instrument further includes a power supply module 6, and the power supply module 6 is connected with the MCU main control unit 2. Fig. 3 is a schematic circuit diagram of a power supply module in this embodiment, in fig. 3, the power supply module 6 includes a first inductor L1, a first capacitor C1, a first resistor R1, a second inductor L2, a first transistor Q1, a second capacitor C2, a second resistor R2, a third resistor R3, a fourth resistor R4, a dc power VCC, a second transistor Q2, and a voltage output terminal Vo, wherein one end of the first inductor L1 is connected to one end of a first capacitor C1, the other end of the first capacitor C1 is connected to one end of a first resistor R1, the base of the first transistor Q1, and one end of a fourth resistor R4, the collector of the first transistor Q1 is connected to one end of a second inductor L2, one end of a second capacitor C2, one end of a second resistor R2, and the voltage output terminal Vo, the other end of the first resistor R1 is connected to one end of a second inductor L VCC 28, the base of the second inductor L2, the second resistor R867, and the base of the second resistor R3, the collector of the second triode Q2 is connected with the other end of the fourth resistor R4, and the other end of the first inductor L1, the emitter of the first triode Q1, the other end of the second capacitor C2, the other end of the third resistor R3 and the emitter of the second triode Q2 are all grounded.

In this embodiment, the fourth resistor R4 is a current limiting resistor for performing current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the fourth resistor R4 is located is large, the current of the branch where the fourth resistor R4 is located can be reduced by the fourth resistor R4, so that the branch is kept in a normal operating state, and the components in the circuit are not burned out due to too large current, so that the safety and reliability of the circuit are high. It should be noted that, in the present embodiment, the resistance of the fourth resistor R4 is 36k Ω. Of course, in practical applications, the resistance of the fourth resistor R4 may also be adjusted according to specific situations, that is, the resistance of the fourth resistor R4 may also be increased or decreased according to specific situations.

In this embodiment, the first inductor L1 and the second inductor L2 are two coils wound on the same magnetic ring, the first inductor L1 is wound by 6 turns, the second inductor L2 is wound by 15 turns, the first inductor L1, the second inductor L2, the first capacitor C1, the first triode Q1 and the first resistor R1 form a resonant circuit, the second capacitor C2 is a filter capacitor, the second resistor R2 and the third resistor R3 form a voltage division sampling circuit, the voltage division sampling circuit is subjected to phase inversion by the second triode Q2 and then fed back to the base of the first triode Q1, so as to achieve the effect of output voltage stabilization, and the output voltage can be adjusted by adjusting the resistances of the second resistor R2 and the third resistor R3.

In this embodiment, the first transistor Q1 is an NPN transistor, and the second transistor Q2 is an NPN transistor. Of course, in practical applications, the first transistor Q1 and the second transistor Q2 may be PNP transistors, but the circuit structure is changed accordingly.

In this embodiment, the power supply module 6 further includes a first diode D1, an anode of the first diode D1 is connected to an emitter of the second transistor Q2, and a cathode of the first diode D1 is connected to the anode. The first diode D1 is a current limiting diode for current limiting protection. The current limiting protection principle is as follows: when the emitter current of the second triode Q2 is large, the first diode D1 can reduce the emitter current of the second triode Q2 to keep the second triode Q2 in a normal working state, so that the elements in the circuit are not burnt out due to too large current, and the safety and reliability of the circuit are further enhanced. It should be noted that in the present embodiment, the first diode D1 has a model number S-272T. Of course, in practical applications, the first diode D1 may also be another type of diode with similar functions.

In short, in the embodiment, one laser photoacoustic spectrometry online quality analyzer in the invention is equivalent to a plurality of different quality online quality analyzers in the traditional technology, and the invention can simultaneously measure a plurality of oil components, reduce the measurement cost and improve the measurement efficiency.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.