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Trigger sampling device and method of photoelastic modulation type spectrograph

A technology of elastic optical modulation and sampling device, which is applied in the direction of interference spectroscopy, measuring device, spectrometry/spectrophotometry/monochromator, etc., and can solve the problem of low sampling rate, unreal time performance, and large amount of calculation etc. to achieve good autocorrelation, simple control circuit, and high sampling accuracy

Pending Publication Date: 2020-10-09
ZHONGBEI UNIV
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Problems solved by technology

[0004] Aiming at the technical problems of the above-mentioned elasto-optical modulation spectrometer with low sampling rate, large amount of calculation, and unsatisfactory real-time performance, the present invention provides a triggering method for an elasto-optic modulation spectrometer with high sampling accuracy, small calculation amount, and strong real-time performance. Sampling device and method

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  • Trigger sampling device and method of photoelastic modulation type spectrograph
  • Trigger sampling device and method of photoelastic modulation type spectrograph
  • Trigger sampling device and method of photoelastic modulation type spectrograph

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[0030]Electro-optic, magneto-optic, acousto-optic, and elasto-optic modulators that tune the refractive index of materials through electricity, magnetism, ultrasound, or stress can be used as interferometers in Fourier transform spectrometers (FTS). Among them, the application potential of elastic optical modulators in FTS is great. Elasto-optic modulation is an artificial birefringence phenomenon based on the elasto-optic effect. The PEM is mainly composed of a driver that generates a driving force and an elastic-optic birefringent crystal, and a piezoelectric driver is usually used to drive the elastic-optic crystal. The basic working principle is that the optical element and the piezoelectric driver are coupled in a certain way, and a periodic stress is applied through the piezoelectric driver, so that the optical element and the piezoelectric driver perform periodic reciprocating motions in opposite directions, and the entire elastic optical modulator generally works In t...

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Abstract

The invention belongs to the technical field of data sampling of photoelastic modulation type spectrographs, and specifically relates to a trigger sampling device and method of a photoelastic modulation type spectrograph. A telescope, a polarizer and a photoelastic modulator are sequentially arranged on one side of a measured radiation target; an analyzer and an infrared detector are sequentiallyarranged on one side of the photoelastic modulator; a reference laser and a silicon photodetector are respectively arranged on two reflection light paths of the photoelastic modulator; the silicon photodetector is connected with an amplifying and filtering module; a preprocessing module and a zero-crossing comparison module are both connected to an ADC acquisition module; the ADC acquisition module is connected to an FPGA-controlled driving and spectrum restoration processing module; and the FPGA-controlled driving and spectrum restoration processing module is connected to the photoelastic modulator. According to the invention, zero-crossing detection is carried out on a reference interferogram to generate a trigger square wave signal which is used as a clock signal to trigger the ADC acquisition module, so equal optical path difference sampling of the interferogram is realized. The device and method are used for data sampling of the photoelastic modulation type spectrograph.

Description

technical field [0001] The invention belongs to the technical field of data sampling of an elasto-optic modulation spectrometer, and in particular relates to a trigger sampling device and method for an elasto-optic modulation spectrometer. Background technique [0002] According to the working principle, spectrometers are divided into two types: spectroscopic and modulating. One of the spectroscopic spectrometers is a dispersion spectrometer composed of prisms. It has low resolution, is sensitive to temperature and humidity, and is demanding on the environment. The other is composed of The dispersive spectrometer composed of grating adopts advanced grating engraving and replication technology, which improves the resolution, broadens the measurement band, and reduces the environmental requirements. The modulation spectrometer is a Fourier transform spectrometer with wide measurement range, high precision and high resolution. At present, in the infrared and visible light band...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/02G01J3/45
CPCG01J3/0205G01J3/027G01J3/45
Inventor 李克武王志斌张敏娟胡将
Owner ZHONGBEI UNIV
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