Infrared spectrometry device
A measuring device and infrared spectrum technology, applied in color/spectral characteristic measurement, spectrum investigation, etc., can solve the problems of poor work stability, complex optical structure, high processing cost of optical components, etc., to avoid inaccurate spectral measurement results and reduce processing Cost, the effect of simplifying the optical structure
Inactive Publication Date: 2015-03-25
WUHAN YUHONG ENVIRONMENT PROTECTION DEV
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[0005] The present invention mainly solves the technical problems existing in the prior art that the optical structure in the atmosphere is complex, the processing cost of the optical elements is high, the adjustment of the optical path is difficult and the work stability is poor, and an infrared spectrum measuring device is provided. The device can simplify the optical structure of the Fourier infrared spectrometer, reduce the processing cost of optical components and the difficulty of adjusting the optical path, and at the same time use a magnetic encoder to fundamentally avoid the inaccurate spectral measurement results caused by the laser wavelength drift with temperature, and even directly cause The phenomenon that the spectrometer cannot scan normally provides a basis for highly stable and reliable infrared spectrum measurement and analysis
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[0027] According to the theory of Fourier transform infrared spectroscopy, it can be known that the sampling interval Δx of the infrared interference signal needs to meet the conditions:
[0028] Δx ≤ 1 2 ( v max - v min ) - - - ( 1 )
[0029] In formula (1), v max is the upper limit of the wave number region of the infrared spectrum signal, v min is the lower limit of the wave number region of the infrared spectrum signal.
[0030] For the traditional Fourier transform infrared spectrometer, a laser with a wavelength of 0.6328 μm is usually used as the laser light source, and the He-Ne wavelength is used as the sampling interval, that is, Δ...
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The invention relates to a spectrometry device, in particular to an infrared spectrometry device and belongs to the field of environment monitoring. According to the device, a magnetic encoder is used for replacing a laser device in a classic Fourier infrared spectrometer, the optical structure of the Fourier infrared spectrometer is simplified, the machining cost of an optical element is lowered, the adjusting difficulty of a light path is lowered, the phenomenon that laser wavelength drifts along with temperature, so that spectral measurement results are not accurate, or a spectrograph cannot even carry out normal scanning is fundamentally avoided, and a foundation is provided for high-stability high-reliability infrared spectrometry analysis.
Description
technical field [0001] The invention relates to a spectrum measuring device, which belongs to the field of environmental monitoring, in particular to an infrared spectrum measuring device. Background technique [0002] Fourier transform infrared spectrometer is an important instrument widely used in chemical analysis, environmental monitoring and other fields. The classical Fourier transform infrared spectrum includes a laser to generate a laser interference signal. The signal has two functions: one is to monitor the position and direction of the moving corner mirror to ensure its reciprocating scanning near zero optical path difference; The second is to control the high-speed data acquisition card to sample the infrared interference signal at equidistant intervals (the interval is an integer multiple of the half-wavelength of the laser). [0003] Due to the existence of lasers, the optical structure of traditional Fourier transform infrared spectrometers is complicated, an...
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IPC IPC(8): G01J3/28G01N21/35
Inventor 李虹杰任利兵张洁李恺骅
Owner WUHAN YUHONG ENVIRONMENT PROTECTION DEV