CN213090974U

CN213090974U - Broadband micro spectrometer

Info

Publication number: CN213090974U
Application number: CN202022462932.1U
Authority: CN
Inventors: 魏成; 于哲; 赵宇; 刘国肖; 葛迎吉
Original assignee: Cecep Talroad Technology Co ltd
Current assignee: Cecep Talroad Technology Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-04-30
Anticipated expiration: 2030-10-30

Abstract

A broadband micro spectrometer is composed of a shell, a light inlet part, a light splitting part and a receiving part, and is characterized in that a front optical fiber seat, a slit piece and a rear optical fiber seat of the light inlet part are fixed on a front shell cover through bolts, a concave flat field grating of the light splitting part is bonded on a grating mounting plate, the grating mounting plate is connected on the rear shell cover through an adjusting spring and an adjusting thread pair, a diaphragm of the receiving part is located on the rear optical fiber seat and is closed with a CMOS detector, the CMOS detector is installed on the front shell cover, a light filter for eliminating secondary diffraction is installed in front of the CMOS detector, and the front shell cover and the rear shell cover are fixed on the shell through bolts. The utility model discloses characteristics lie in having dwindled the broadband spectrum appearance size of a dimension to eliminate the second grade spectrum, the debugging is simple, small, the quality is light, convenient to use, can integrate, can produce in batches and advantages such as low cost.

Description

Broadband micro spectrometer

Technical Field

The utility model belongs to the technical field of optical instrument, especially, relate to a miniature spectrum appearance of adjustable broadband.

Background

Spectrometers are an important optical instrument. The spectrometer is a scientific instrument which decomposes light with complex components into spectral lines, captures optical information through the spectrometer, and analyzes the information of the spectrometer by matching with a series of optical, precision mechanical, electronic and computer systems, and a broadband spectrum (200nm-800nm) covers ultraviolet light and visible light, so that the spectrometer is vigorously developed in a plurality of application fields such as color sorting production line testing, environment-friendly water vapor detection, LED and other light source laboratories and production line testing in recent years. With the rapid development of portable analytical instruments, broad spectrum, easy adjustment, high resolution and miniaturization are inevitable trends in the development of grating spectrometers, which requires designers to continuously improve the structure of the spectrometer and the optimization design method thereof.

The micro spectrometer adopts the combination of the CCD or COMS detector and the flat field concave grating, thereby greatly reducing the number of optical elements and solving the problems of large volume, high cost, difficult debugging and the like of the traditional spectrometer. The size of the existing micro spectrometer is reduced to some extent, but the actual miniaturization is difficult to achieve, and the existing micro spectrometer is limited by narrow measuring wavelength range and has limitation in application.

Disclosure of Invention

The utility model aims at providing a miniature spectrum appearance of broadband further reduces the volume of spectrum appearance on current miniature optical fiber spectrum appearance's technical basis. The spectrometer can effectively inhibit stray light in a wide band range of 200nm-800nm, improve the sensitivity and resolution in the whole spectral range, and meanwhile, can well filter grating secondary diffraction light and improve the stability of the spectrometer.

The technical scheme of the utility model is, a miniature spectrum appearance of broadband, by the casing, advance the light part, beam split part and receiving element are constituteed, advance the optic fibre front stall and the slit piece and the optic fibre back seat of light part and pass through the bolt fastening on the casing protecgulum, the concave surface flat field grating of beam split part bonds on the grating mounting panel, the grating mounting panel passes through adjusting spring and adjusts the screw thread pair and cover behind the casing, receiving element's diaphragm is located the optic fibre back seat, it has the CMOS detector to press close to, the CMOS detector is installed on the casing protecgulum, the light filter of eliminating the second grade diffraction is being installed in CMOS detector front, casing protecgulum and casing back cover pass through the bolt fastening on the casing.

The utility model adopts the optical fiber as the transmission component of the light to lead the light to enter the light inlet part of the spectrometer, the light inlet part disperses the incident light into light with different wavelengths to be converged in the linear array, and the receiving part is used for adjusting the rotation of the grating, the pitching angle and the position of a focusing point,

the slit piece is compressed tightly and is fixed to the casing protecgulum through the bolt with optic fibre front stall and optic fibre backseat machinery, and the slit piece is easily changed, and 5um, 10um, 25um, 50um, 100um are selected to the slit width.

The second-order diffraction eliminating filter is spliced by JGS1 quartz, a 380nm long-pass filter and a 580nm long-pass filter.

The appearance of the spectrometer is of a cylindrical structure, and the front cover and the rear cover of the shell are fixed on the shell through bolts.

The utility model provides a miniature spectrum appearance of broadband has optimized ordinary broadband fiber optic spectrometer volume, has got rid of collimating mirror and the focus mirror inside traditional spectrum appearance, adopts the flat field concave grating that the design reduces the size to carry out the beam split and focus, thereby realize that the spectrum appearance volume reduces, compact structure, small, the portability is strong, can integrate the height, easily realize the modularization. The slit is mechanically fixed and is compressed by a bolt, so that the slit can be replaced conveniently to meet the requirements of different light source intensities and resolutions. The optical filter adopts JGS1 quartz, and the 380nm long-pass optical filter and the 580nm long-pass optical filter are spliced, so that the cost is reduced, secondary development and use are easy, and the adjustment is simple and convenient through the matching of three thread pairs and two springs.

The utility model discloses a miniature spectrum appearance of broadband all has the wide application in scientific research and many fields of industry, like environmental protection detection, chemical analysis, scientific and technological agriculture, quality of water on-line measuring etc..

Description of the drawings:

FIG. 1 is a schematic view of the structure of a broadband micro spectrometer of the present invention

FIG. 2 is the slit installation structure diagram of a broadband micro spectrometer

FIG. 3 is a schematic diagram of an adjusting structure of a broadband micro spectrometer

FIG. 4 is the schematic diagram of the optical filter of a broadband micro spectrometer

In the figure, 1-optical fiber front seat, 2-slit sheet, 3-diaphragm, 4-optical fiber rear seat, 5-concave flat field grating, 6-grating mounting plate, 7-adjusting spring, 8-adjusting screw thread pair, 9-CMOS detector, 10-optical filter, 11-shell front cover, 12-shell and 13-shell rear cover.

Detailed Description

By figure 1, the utility model discloses a miniature spectrum appearance of broadband, by the casing, advance the light part, divide light part and receiving element to constitute, advance the optic fibre front stall 1 and slit piece 2 and the optic fibre back seat 4 of light part and pass through the bolt fastening on casing protecgulum 11, the concave surface flat field grating 5 of light part bonds on grating mounting panel 6, the grating mounting panel passes through regulating spring 7 and adjusts the vice 8 connection of screw thread on casing hou gai 13, receiving element's diaphragm 3 is located optic fibre back seat 4, it has CMOS detector 9 to press close to, CMOS detector 9 installs on casing protecgulum 11, install the light filter 10 of eliminating the second grade diffraction in CMOS detector 9 front, casing protecgulum 11 and casing back lid 13 pass through the bolt fastening on casing 12.

As can be seen from fig. 2, the slit sheet is fixed between the optical fiber front seat and the optical fiber rear seat in a mechanical pressing and fixing manner, and the rear seat is provided with a light stop to match the numerical aperture of the spectrometer, thereby reducing stray light.

As can be seen from FIG. 3, the grating mounting plate is adjusted by two adjusting springs and three adjusting screw pairs to drive the grating to adjust.

As can be seen from FIG. 4, the optical filter is formed by splicing three parts, namely JGS1 quartz, a 380nm long-pass optical filter and a 580nm long-pass optical filter, and filtering out the second-order diffraction of the spectrum.

The utility model discloses method of installation and debugging: the utility model adopts the optical fiber as the transmission component of the light to lead the light to enter the light inlet part of the spectrometer, the light inlet part disperses the incident light into light with different wavelengths to be converged in the linear array, and the receiving part is used for adjusting the rotation of the grating, the pitching angle and the position of a focusing point,

the optical fiber front seat 1, the slit sheet 2 and the optical fiber rear seat 4 are fixed on the shell front cover 11 through bolts, the diaphragm 3 is located on the optical fiber rear seat 4, the optical filter is bonded on the shell front cover 11, the CMOS detector 9 is fixed on the shell front cover 11, the concave flat field grating 5 is bonded on the grating mounting plate 6, the grating mounting plate is connected on the shell rear cover 13 through the adjusting spring 7 and the adjusting thread pair 8, the shell front cover 11 and the shell rear cover 13 are fixed on the shell 12 through bolts, the three thread pairs 8 are adjusted in the same direction, the front and rear positions of the grating can be adjusted, and therefore the size of a light spot focused on the CMOS detector 9 is influenced, namely the resolution index of the spectrometer is influenced. The three thread pairs and the adjusting spring are matched to drive the rotation angle and the pitching of the flat-field concave grating, so that light spots focused on the CMOS detector 9 and with different wavelengths are located on a specified pixel point, and the CMOS detector 9 converts optical signals into electric signals to be output from the circuit board.

Claims

1. A broadband micro spectrometer is composed of a shell, a light inlet part, a light splitting part and a receiving part, and is characterized in that a front optical fiber seat, a slit piece and a rear optical fiber seat of the light inlet part are fixed on a front shell cover through bolts, a concave flat field grating of the light splitting part is bonded on a grating mounting plate, the grating mounting plate is connected on the rear shell cover through an adjusting spring and an adjusting thread pair, a diaphragm of the receiving part is located on the rear optical fiber seat and is closed with a CMOS detector, the CMOS detector is installed on the front shell cover, a light filter for eliminating secondary diffraction is installed in front of the CMOS detector, and the front shell cover and the rear shell cover are fixed on the shell through bolts.

2. The broadband micro spectrometer according to claim 1, wherein the concave grating is bonded to a grating mounting plate, the grating mounting plate being connected to the housing back cover by 2 adjustment springs and 3 adjustment screw pairs.

3. The broadband micro spectrometer according to claim 1, wherein the slit plate is mechanically pressed and fixed by a fiber front seat and a fiber rear seat, and the diaphragm is integrated on the fiber rear seat and fixed on the housing front cover by a bolt.

4. The broadband micro spectrometer according to claim 1, wherein the second-order spectral elimination filter is made of three materials which are JGS1 quartz, a 380nm long-pass filter and a 580nm long-pass filter by bonding with optical cement, and the whole filter is glued on the rear cover of the housing.

5. The broadband micro spectrometer according to claim 1, wherein the spectrometer has a cylindrical appearance, and the front cover and the rear cover of the housing are fixed to the housing by bolts.