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Double-detector micro near-infrared spectrometer with whole spectral band of 800-2,500nm

A near-infrared spectrometer and dual-detector technology, applied in the field of spectral measurement, can solve the problems of inability to preprocess the spectrum, obtain continuous spectrum, poor wavelength resolution, etc., achieve improved control stability and precision, and stable optical path structure , The effect of reducing the volume of the instrument

Active Publication Date: 2017-02-15
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

The disadvantages of this type of instrument are: monochromatic light has a wide spectral band and poor wavelength resolution; it is more sensitive to temperature and humidity; it cannot obtain continuous spectrum; it cannot preprocess the spectrogram, and the amount of information obtained is small
The disadvantage is that it is more sensitive to the polarization state, and the resolution is lower, etc.

Method used

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  • Double-detector micro near-infrared spectrometer with whole spectral band of 800-2,500nm
  • Double-detector micro near-infrared spectrometer with whole spectral band of 800-2,500nm
  • Double-detector micro near-infrared spectrometer with whole spectral band of 800-2,500nm

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing.

[0026] see figure 1 , in one embodiment of the present invention, the optical path system of miniature near-infrared spectrometer is composed of near-infrared light source 1, incident slit 2, concave collimator mirror 3, MOEMS scanning grating micromirror 4, concave imaging mirror 5, exit slit 6 , 500nm-1700nm single-tube near-infrared detector 7 and 900nm-2600nm single-tube near-infrared detector 8.

[0027]In this embodiment, the optical path system of the improved Czerny-Turner structure is adopted, and the MOEMS scanning grating micromirror 4 is used as the optical axis. Two groups of concave collimating mirrors 3 with a diameter of 100mm, the vertical axis distances from the center of mass of the two to the optical axis are 16.5mm and 19.5mm respectively, and the off-axis angles are -10 o and 5 o , the rotation angle of MOEMS scanning grating micromirror 4 is ±6.5 ...

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Abstract

The invention provides a double-detector micro near-infrared spectrometer with a whole spectral band of 800-2,500nm. The double-detector micro near-infrared spectrometer consists of a near-infrared light source, an entrance slit, a concave collimating lens, an MOEMS scanning raster micro-mirror, a concave imaging lens, an exit slit and mono-tube near-infrared double sensors different in response wavelength range. In the invention, the improved Czerny-Turner optical path system effectively inhibits aberration and guarantees the imaging quality of the system. By adopting the MOEMS scanning raster micro-mirror integrated with an angle sensor, the double-detector micro near-infrared spectrometer provided by the invention has scanning and light splitting functions in a broadband range and also can accurately control the scanning angle in real time to realize continuous and accurate detection of different wavelengths of the mono-tube near-infrared double sensors. The double-detector micro near-infrared spectrometer has the advantages of low price, small volume, fast response, high precision, wide detection spectral range and the like.

Description

technical field [0001] The invention relates to a miniature near-infrared spectrometer, which belongs to the technical field of spectrum measurement. Background technique [0002] Spectral analysis instruments are an important part of modern optical instruments. Through the use of spectroscopic principles, qualitative and quantitative analysis of the structure and components of substances can be achieved. Near-infrared spectrum refers to electromagnetic waves with wavelengths in the range of 800nm-2500nm. In the range of near-infrared spectroscopy, the main research is the combined and doubled frequency absorption of hydrogen-containing group vibrations. Different molecular structures have different vibration frequencies, so the corresponding infrared absorption spectra are also different. The near-infrared spectrometer realizes the component identification function by identifying the absorption spectra of different molecular structures. Existing near-infrared spectromete...

Claims

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Application Information

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IPC IPC(8): G01N21/359
CPCG01N21/359
Inventor 温志渝周颖温泉黄俭
Owner CHONGQING UNIV
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