A Method for Preprocessing of Elasto-optic Modulation Interference Signal
An elastic-optical modulation and interference signal technology, which is applied in the field of elastic-optical modulation interference signal preprocessing, can solve the problem that interference data is not specified in detail, and achieve the effect of realizing wavelength calibration and improving accuracy.
Inactive Publication Date: 2016-01-20
ZHONGBEI UNIV
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[0004] The existing technologies all use the non-uniform sampling method, and the specific processing of the interference data is not explained in detail. Therefore, in order to realize the processing of the interference data and the calibration of the restored spectrum, it is necessary to preprocess the high-resolution elasto-optic modulation interference signal method for research
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[0020] The following embodiments will further describe the present invention in conjunction with the accompanying drawings.
[0021] The optical path difference of the high-resolution elasto-optical modulation interferometer is relatively large. In the spectral detection of visible light and near-infrared bands, the signal frequency is very high, and the traditional equal-phase sampling method cannot be used to realize the sampling of interference signals. Therefore, the elasto-optic modulation Fourier transform spectrometer of the present invention adopts the clock chip as the clock of the AD converter, realizes the equal time sampling of the interference signal, and realizes the fast Fourier transform of the interference signal with the non-uniform Fourier transform algorithm. leaf transformation. In order to ensure the undistorted collection of interferograms, the sampling frequency should satisfy the formula:
[0022] The interference data collected by the AD converter ...
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The invention discloses a photoelastic modulation interference signal preprocessing method, belonging to the field of the data processing of a photoelastic modulation interference signal. The invention provides a photoelastic modulation interference signal preprocessing method of sampling a high resolution photoelastic modulation interference signal, extracting a complete interference picture and detecting the transient maximum optical path difference of the interference picture. The sampling of the high resolution photoelastic modulation interference signal is that a clock chip is used as the clock of an AD converter, the equal time sampling of the interference signal is realized, the rapid Fourier transform of the interference signal is realized with a non-uniform Fourier transform algorithm. The extraction of the complete interference picture is that when a radiation resource is a complex color light source, by using the characteristic that a zero light path difference point amplitude is absolutely largest, through detecting data amount between two adjacent interference picture maximum values, the complete interference picture is determined. The method is mainly applied to the data processing of a photoelastic modulation interference signal.
Description
technical field [0001] The invention relates to a method for preprocessing an elasto-optic modulation interference signal, which belongs to the field of data processing of an elasto-optic modulation interference signal. Background technique [0002] With the deepening of scientific research, higher requirements are put forward for spectroscopic instruments. The existing time-modulated Fourier transform spectrometer has slow detection speed and poor seismic performance, and is not suitable for operating in harsh environments; the static Fourier transform spectrometer has a narrow spectral range and low resolution, and requires an array of detectors. Its application in high-speed spectral measurement. Therefore, it is difficult for existing Fourier transform spectrometers to meet the detection speed requirements of transient spectrum detection. [0003] Elasto-optic modulation Fourier transform spectrometer has the advantages of fast measurement speed, wide spectral range, g...
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IPC IPC(8): G01J3/28G01J3/02
Inventor 张敏娟李晋华王志斌李世伟陈友华陈媛媛张瑞
Owner ZHONGBEI UNIV