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CN-121298666-B - Miniaturized near infrared spectrometer imaging system

CN121298666BCN 121298666 BCN121298666 BCN 121298666BCN-121298666-B

Abstract

The application relates to a miniaturized near infrared spectrometer imaging system, which relates to the field of near infrared spectrometers and comprises a light source module, a sample light generating module, an optical fiber coupler, an optical fiber F-P filter, a photoelectric detector and a multimode optical fiber, wherein light generated by the light source module can irradiate a sample through the sample light generating module and generate sample light, the optical fiber coupler is connected with the optical fiber F-P filter and the photoelectric detector through multimode optical fibers, and the optical fiber coupler receives the sample optical fiber and transmits the sample optical fiber to the photoelectric detector through the multimode optical fiber, the optical fiber F-P filter and the multimode optical fiber. The application has the effects of reducing baseline drift and noise of the spectrum, improving the accuracy of the spectrum, and having smaller volume and lighter weight.

Inventors

  • YING KANG
  • CAI SHENGWEN

Assignees

  • 过程(江苏)分析技术有限公司

Dates

Publication Date
20260512
Application Date
20251108

Claims (10)

  1. 1. The miniaturized near infrared spectrometer imaging system is characterized by comprising a light source module (11), a sample light generating module (14), an optical fiber coupler (15), an optical fiber F-P filter (16), a photoelectric detector (17) and a multimode optical fiber (18); The light generated by the light source module (11) can irradiate a sample through the sample light generating module (14) and generate sample light, the optical fiber coupler (15) is connected with the optical fiber F-P filter (16) and the optical fiber F-P filter (16) is connected with the photoelectric detector (17) through the multimode optical fiber (18), and the optical fiber coupler (15) receives the sample light and transmits the sample light to the photoelectric detector (17) through the multimode optical fiber (18), the optical fiber F-P filter (16) and the multimode optical fiber (18).
  2. 2. The miniaturized near infrared spectrometer imaging system according to claim 1, wherein a condenser (12) and a collimating lens (13) are arranged between the light source module (11) and the sample light ray generation module (14), and light rays generated by the light source module (11) are sequentially transmitted to the sample light ray generation module (14) after passing through the condenser (12) and the collimating lens (13).
  3. 3. The miniaturized near infrared spectrometer imaging system of claim 2, wherein the sample light generation module (14) comprises a semi-transparent half mirror (141) and a carrier module (142), wherein the carrier module (142) is used for placing a sample, and the semi-transparent half mirror (141) is capable of transmitting incident light and reflecting sample light to the optical fiber coupler (15).
  4. 4. The miniaturized near infrared spectrometer imaging system of claim 1, wherein the sample light generation module (14) comprises a transparent carrier platform (143) through which incident light can be transmitted to the fiber optic coupler (15) through the transparent carrier platform (143).
  5. 5. The miniaturized near infrared spectrometer imaging system according to claim 3, wherein a first reflector (21) is arranged between the collimating lens (13) and the semi-transparent semi-reflecting mirror (141), the first reflector (21) can slide up or deviate from the light path of the incident light, the first reflector (21) transmits the incident light to the sample through an incident mirror group (22), and the sample light generated by transmitting the sample is transmitted to the optical fiber coupler (15) through an emergent mirror group (23).
  6. 6. The miniaturized near infrared spectrometer imaging system according to claim 5, wherein the incident mirror set (22) comprises a second reflector (221) and a third reflector (222), the included angle between the first reflector (21) and the incident light is 45 degrees, the second reflector (221) is arranged in parallel with the first reflector (21), and the third reflector (222) is arranged perpendicular to the second reflector (221) and opposite to the sample.
  7. 7. The miniaturized near infrared spectrometer imaging system according to claim 6, wherein the exit mirror set (23) comprises a fourth mirror (231), a fifth mirror (232), the fourth mirror (231) being arranged parallel to the second mirror (221) and being adapted to reflect sample light transmitted through the sample to the fifth mirror (232), the fifth mirror (232) being adapted to reflect sample light to the fiber optic coupler (15).
  8. 8. The miniaturized near infrared spectrometer imaging system of claim 7, wherein the fifth mirror (232) is disposed in the optical path between the fiber coupler (15) and the sample, the fifth mirror (232) being capable of sliding up or off the optical path.
  9. 9. The miniaturized near infrared spectrometer imaging system of claim 7, further comprising a linear drive mechanism (24), wherein the linear drive mechanism (24) is connected to the first mirror (21) and the fifth mirror (232) to drive the first mirror (21) and the fifth mirror (232) to slide up or off the corresponding optical paths.
  10. 10. The miniaturized near infrared spectrometer imaging system of claim 1, wherein the fiber F-P filter (16) is a tunable fiber F-P filter having an operating wavelength in the range of 780-2500nm.

Description

Miniaturized near infrared spectrometer imaging system Technical Field The application relates to the field of near infrared spectrometers, in particular to a miniaturized near infrared spectrometer imaging system. Background The near infrared spectrometer is an instrument for acquiring information of a sample by utilizing a near infrared spectrum technology, and has the characteristics of simpler instrument, high analysis speed, no damage, small sample preparation amount, almost suitability for analysis of various samples (liquid, viscous body, coating, powder and solid), simultaneous determination of multiple components and multiple channels and the like, and is widely applied to a plurality of fields including agriculture and grazing, food, chemical industry, petrochemical industry, pharmacy, tobacco and the like. In the near infrared spectrometer in the prior art, light reflected or transmitted by a sample irradiates a photoelectric detector through a grating, and the photoelectric detector converts an optical signal into an electric signal to be output, so that the spectral output of the near infrared spectrometer is completed. However, in the prior art, light is transmitted to the grating through space and then transmitted to the photoelectric detector through space, and in the process of light re-space transmission, the space gas is easy to change in temperature to cause fluctuation of air refractive index, so that stray light in the light is increased, baseline drift of a spectrum is overlapped with noise, and the accuracy of the spectrum is reduced. Disclosure of Invention In order to solve the problem that the accuracy of a spectrum is reduced due to the fact that baseline drift of the spectrum is overlapped with noise caused by the rising of stray light in the light beam splitting process, the application provides a miniaturized near infrared spectrometer imaging system. The application provides a miniaturized near infrared spectrometer imaging system which adopts the following technical scheme: A miniaturized near infrared spectrometer imaging system comprises a light source module, a sample light generating module, an optical fiber coupler, an optical fiber F-P filter, a photoelectric detector and a multimode optical fiber; The light generated by the light source module can irradiate a sample through the sample light generating module and generate sample light, the optical fiber coupler is connected with the optical fiber F-P filter and the photoelectric detector through the multimode optical fibers, and the optical fiber coupler receives the sample light and transmits the sample light to the photoelectric detector through the multimode optical fibers, the optical fiber F-P filter and the multimode optical fibers. By adopting the technical scheme, when a sample is detected, a light source generated by the light source module is transmitted to the sample light generating module, sample light is generated, the sample light is transmitted to the input end of the optical fiber coupler, the sample light is coupled by the optical fiber coupler and then transmitted to the optical fiber F-P filter through the multimode optical fiber, and light with specific wavelength screened by the optical fiber F-P filter is transmitted to the detector through the other section of multimode optical fiber, so that the receiving of an optical signal is completed. And in the process that the sample light is transmitted to the photoelectric detector through the optical fiber coupler, the multimode optical fiber F-P filter and the multimode optical fiber, the optical signal is transmitted in the multimode optical fiber, stray light mixing caused by air scattering and dust pollution is avoided, baseline drift and noise of a spectrum are reduced, and the accuracy of the spectrum is improved. The optical fiber F-P filter is matched with the flexible multimode optical fiber, so that the optical fiber F-P filter can be flexibly distributed inside an instrument without reserving a mechanical rotation space, and compared with the original grating scheme, the optical spectrometer is smaller in size and lighter in weight. Preferably, a condensing lens and a collimating lens are arranged between the light source module and the sample light generating module, and light generated by the light source module is transmitted to the sample light generating module after passing through the condensing lens and the collimating lens in sequence. By adopting the technical scheme, the condensing lens and the collimating lens perform condensation and collimation treatment on the light generated by the light source module, so that the light is more concentrated and transmitted to the sample light generating module in a more consistent direction, the light utilization rate is enhanced, the intensity and quality of the sample light are improved, and the accuracy and the sensitivity of spectrum detection are improved. Preferably, the sample light g