阅读说明：本技术 一种单点扫描式光谱仪 (Single-point scanning type spectrometer ) 是由 陈兴海 李伟 张卓 张宏宇 孙玉琳 于 2021-09-02 设计创作，主要内容包括：本发明公开了一种单点扫描式光谱仪,包括沿光路方向依次设置的收光元件、滤光片、狭缝和探测器,滤光片为线性渐变滤光片,滤光片沿垂直于光路方向活动设置,使滤光片的光谱特性沿其移动方向线性变化。本发明的光谱仪通过驱动线性渐变滤光片改变位置,使单点探测器采集不同光谱数据,相对于线阵探测器,能够达到相同的效果,并且大大降低了成本；相较于傅里叶型单点光谱仪需要动镜进行匀速运动,对动镜的驱动要求较高,该光谱仪结构简单,只有一维运动,稳定性较高。(The invention discloses a single-point scanning spectrometer which comprises a light receiving element, a light filter, a slit and a detector which are sequentially arranged along the direction of a light path, wherein the light filter is a linear gradient light filter, and the light filter is movably arranged along the direction vertical to the direction of the light path, so that the spectral characteristics of the light filter are linearly changed along the moving direction of the light filter. The spectrometer of the invention enables the single-point detector to collect different spectral data by driving the linear gradient filter to change the position, can achieve the same effect compared with a linear array detector, and greatly reduces the cost; compared with a Fourier type single-point spectrometer, the spectrometer has the advantages that the moving mirror needs to move at a constant speed, the requirement on driving of the moving mirror is high, the spectrometer is simple in structure and only moves in one dimension, and the stability is high.)

1. The utility model provides a single-point scanning formula spectrum appearance, includes along light path direction set gradually receive optical element (1), light filter (3), slit (6) and detector (7), its characterized in that, light filter (3) are linear gradual change light filter, light filter (3) are along perpendicular to light path direction activity setting, make the spectral characteristic of light filter (3) is along its moving direction linear variation.

2. The single-point scanning spectrometer according to claim 1, wherein a one-dimensional displacement stage is disposed on the filter (3), and the one-dimensional displacement stage is configured to control the filter (3) to move.

3. The single-point scanning spectrometer according to claim 2, wherein the one-dimensional displacement platform comprises a mounting substrate (5), a slide rail (4) is disposed on the mounting substrate (5) perpendicular to the optical path direction, a moving base (2) is slidably disposed on the slide rail (4), and the optical filter (3) is connected to the moving base (2).

4. The single-point scanning spectrometer according to claim 3, wherein a through hole is formed in the movable base (2) in a direction perpendicular to the distribution direction of the slide rail (4), the through hole and the optical filter (3) are located in the same plane, an insertion strip (10) matched with the through hole is inserted into the through hole, one end of the insertion strip (10) is fixed to the optical filter (3), a set screw (9) is connected to the movable base (2) through a thread, and the end of the set screw (9) abuts against the insertion strip (10).

5. The single-point scanning spectrometer according to claim 1, wherein the detector (7) is a single-point silicon detector or a single-point indium gallium arsenic detector.

Technical Field

The invention belongs to the technical field of spectrometers, and particularly relates to a single-point scanning type spectrometer.

Background

The visible light and near infrared spectrum technology is a novel analysis technology which is simple to use, rapid in analysis and free of damage to substances, can detect multiple components and physical characteristic parameters in a sample at the same time, and the analysis result can accurately approach the traditional determination method.

Currently, single-point spectrometers are roughly classified into reflection holographic grating type single-point spectrometers and fourier type single-point spectrometers. The reflection holographic grating type single-point spectrometer uses a single-point detector or a linear array detector to collect optical signals, the linear array detector can collect the spectrum of a required wave band at one time, but the equipment cost is high, the single-point detector needs to use an encoder to record the position of each time of grating scanning, and finally, the conversion from a pixel domain to a wavelength domain is carried out, so that the operation is complicated. The Fourier single-point spectrometer receives light through a light receiving device, then the light passes through a beam splitter, half of the light is reflected to a fixed mirror, half of the light is transmitted to a movable mirror, then the movable mirror moves at a constant speed, interference light with different optical path differences enters a single-point detector to be collected, the movable mirror needs to move at a constant speed during use, the requirement on driving of the movable mirror is high, and the stability is not high. Therefore, a spectrometer is needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a single-point scanning type spectrometer, which aims to solve the technical problems of complex operation, high use cost and poor stability of the existing single-point spectrometer.

In order to solve the technical problems, the specific technical scheme of the single-point scanning spectrometer of the invention is as follows:

the single-point scanning spectrometer comprises a light receiving element, an optical filter, a slit and a detector which are sequentially arranged along the direction of a light path, wherein the optical filter is a linear gradient optical filter, and the optical filter is movably arranged along the direction vertical to the direction of the light path, so that the spectral characteristics of the optical filter linearly change along the moving direction of the optical filter.

Preferably, in order to control the movement of the optical filter, a one-dimensional displacement platform is arranged on the optical filter, and the one-dimensional displacement platform is configured to control the movement of the optical filter.

Preferably, in order to improve the reliability of the optical filter in moving, the one-dimensional displacement platform comprises a mounting substrate, a sliding rail is arranged on the mounting substrate and perpendicular to the direction of the light path, a moving seat is arranged on the sliding rail in a sliding manner, and the optical filter is connected with the moving seat.

Preferably, in order to adjust the position of the optical filter and facilitate the disassembly, assembly and replacement of the optical filter, a through hole is formed in the movable seat and perpendicular to the distribution direction of the sliding rails, the through hole and the optical filter are located in the same plane, an inserting strip matched with the through hole is inserted in the through hole, one end of the inserting strip is fixed with the optical filter, a set screw is connected to the movable seat in a threaded manner, and the end of the set screw abuts against the inserting strip.

Preferably, in order to detect spectral data of different wavebands, the detector is a single-point silicon detector or a single-point indium gallium arsenic detector.

The single-point scanning spectrometer of the invention has the following advantages:

1. the spectrometer enables the single-point detector to acquire different spectral data by driving the linear gradient filter to change the position, can achieve the same effect relative to a linear array detector, and greatly reduces the cost;

2. compared with a Fourier type single-point spectrometer, the spectrometer has the advantages that the moving mirror needs to move at a constant speed, the requirement on driving of the moving mirror is high, the spectrometer is simple in structure and only moves in one dimension, and the stability is high.

Drawings

FIG. 1 is a schematic diagram of a single-point scanning spectrometer according to the present invention;

FIG. 2 is a schematic structural diagram of a one-dimensional displacement stage according to the present invention;

the notation in the figure is: 1. a light receiving element; 2. a movable seat; 3. an optical filter; 4. a slide rail; 5. a mounting substrate; 6. a slit; 7. a detector; 8. a lead screw; 9. tightening the screw; 10. inserting strips; 11. an electric motor.

Detailed Description

For better understanding of the purpose, structure and function of the present invention, a single-point scanning spectrometer according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-2, a single-point scanning spectrometer comprises a light receiving element 1, a filter 3, a slit 6 and a detector 7 sequentially arranged along a light path direction, wherein the filter 3 is a linear gradient filter, a one-dimensional displacement platform is arranged on the filter 3, the one-dimensional displacement platform comprises a mounting substrate 5, a slide rail 4 is arranged on the mounting substrate 5 and is perpendicular to the light path direction, a moving seat 2 is arranged on the slide rail 4 in a sliding manner, through holes are arranged on the moving seat 2 and are perpendicular to the distribution direction of the slide rail 4, the through holes and the filter 3 are positioned in the same plane, insertion strips 10 matched with the through holes are inserted in the through holes, one ends of the insertion strips 10 are fixed with the filter 3, a set screw 9 is connected to the moving seat 2 in a threaded manner, the end portions of the set screw 9 abut against the insertion strips 10, and the position of the filter 3 can be adjusted by adjusting the insertion depth of the insertion strips 10, meanwhile, the optical filter 3 is convenient to replace, the motor 11 and the lead screw 8 are installed on the installation substrate 5, the movement can be more stable and reliable through the drive of the lead screw 8, the electric control module is further installed in the spectrometer and used for controlling the motor 8 and the detector 7, the motor 8 provides power, the moving seat 2 is driven by the lead screw 8 to move along the sliding rail 4, the optical filter 3 is driven by the moving seat 2 to be movably arranged along the direction perpendicular to the light path, and the spectral characteristic of the optical filter 3 is linearly changed along the moving direction.

When the spectrometer is used, the light receiving element 1 collects a target spectrum, and the target spectrum is collected by the detector 7 after passing through the optical filter 3; the linear gradient filter adopts a continuous coating mode, the filtering characteristic of continuous change of space is realized based on a multilayer wedge-shaped film structure, the slope of the film can be adjusted according to the dispersion requirement, so that the target linear change rate is obtained, the linear gradient filter has the light splitting capacity with high integration level, in the process, the electric control module controls the filter 3 to move to one position every time, the detector 7 collects data once, all spectral data of a required waveband can be obtained through the movement of the filter 3 and the multiple collection of the detector 7, and then the conversion from pixel domain spectrum to wavelength domain spectrum is carried out on all the collected data, so that the final spectrum is obtained; the exit slit 6 in front of the detector 7 can control the resolution of the spectrum; different spectrums can be obtained by selecting linear gradient filters with different wave bands to be matched with different detectors 7, when the linear gradient filter with the wave band of 400-plus-1000 nm and the single-point silicon detector are used, a target spectrum with the wave band of 400-plus-1000 nm can be obtained, and when the linear gradient filter with the wave band of 900-plus-1700 nm and the single-point indium gallium arsenic detector are used, a target spectrum with the wave band of 900-plus-1700 nm can be obtained.

The spectrometer enables the single-point detector to acquire different spectral data by driving the linear gradient filter to change the position, can achieve the same effect relative to a linear array detector, and greatly reduces the cost; compared with a Fourier type single-point spectrometer, the spectrometer has the advantages that the moving mirror needs to move at a constant speed, the requirement on driving of the moving mirror is high, the spectrometer is simple in structure and only moves in one dimension, and the stability is high.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.