A kind of multi-resolution broadband Fourier infrared spectrometer moving mirror motor control method
An infrared spectrometer, multi-resolution technology, applied in the field of Fourier infrared, can solve the problem of reduced response frequency, the optimal response frequency is only tens to hundreds of hertz, to simplify control and facilitate the multi-resolution of the instrument The effect of spectral detection
Active Publication Date: 2022-08-02
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
In order to expand the spectral response range of the Fourier transform infrared spectrometer, the spectral range of the instrument can be covered from near-infrared to far-infrared by switching detectors with different response bands and pre-amplifier circuits. However, as the response band of the detector extends to far-infrared, the device The response time constant of the pyroelectric detector is increasing, and the response frequency will gradually decrease. For example, the response band of the pyroelectric detector can cover 100 μm, but the best response frequency is only tens to hundreds of Hz
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[0026] Attached below figure 1 , 2 3. The specific implementation of the moving mirror motor control method of the multi-resolution broadband Fourier infrared spectrometer proposed by the present invention is further explained, and the instrument interference system is shown as follows: figure 2 As shown, the reference laser 101 selects a helium-neon laser with a wavelength of 632.8 nm. It can be seen that the reference laser is divided into two parts by the beam splitter 102, and the two beams of light are reflected by the fixed mirror 103 and the moving mirror 104 respectively. Interference, the interference results are collected by the off-axis parabolic mirror 105 and then incident on the laser detector 106. At the same time, the target radiation that has been optically collimated in front of the instrument is divided into two parts by the infrared target beam splitter 201, and incident on the laser detector 106 respectively. The mirror 202 and the moving mirror 203 are ...
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The invention discloses a method for controlling a moving mirror motor of a multi-resolution broadband Fourier infrared spectrometer. By adjusting the working speed of the moving mirror motor of the instrument, the frequency range of a target radiation interference signal is changed to match the switching frequency of different response bands. The optimal response frequency of the detector and the preamplifier circuit, thereby improving the quality of the output signal of the detector and the preamplifier circuit, and realizing the spectral detection of a wide band and a high signal-to-noise ratio with a spectral range covering the near-infrared to far-infrared; The movement period of the mirror motor, the effective stroke of the fixed motor constant speed section to implement the target radiation interference signal sampling, that is, the amount of data sampled by the instrument in each detection process is the same, and it meets the inversion needs of the maximum spectral resolution. , it is necessary to intercept the amount of data required for the inversion of the corresponding spectral resolution from the data obtained by sampling, taking the maximum signal sampled at the "0 optical path difference position" as the center, and then perform spectral inversion.
Description
Technical field: [0001] The invention relates to the field of Fourier infrared spectrometer, aiming at the application requirements of a multi-resolution, wide-band and high signal-to-noise ratio Fourier infrared spectrometer, by adjusting the working speed of a moving mirror motor in an instrument interference system to change the target radiation interference The frequency range of the signal matches the optimal response frequency of the switched detectors and preamplifier circuits of different response bands, thereby improving the quality of the output signals of the detectors and preamplifier circuits, and realizing the wide spectrum of the instrument covering the near-infrared to far-infrared. Band, high signal-to-noise ratio spectral detection; and by calibrating the motion period of the moving mirror motor of the instrument, the effective stroke of the instrument to implement the target radiation interference signal sampling in the constant speed section of the fixed mot...
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IPC IPC(8): G01J3/45G01J3/02G01J3/06
CPCG01J3/45G01J3/027G01J3/06G01J2003/062
Inventor 李飞飞何志平杨秋杰季海兵李春来
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI