Interference spectrum system based on band-pass sampling technology and target spectrum information acquisition method
A technology of band-pass sampling and interference spectroscopy, which is applied in the field of spectrum testing, can solve problems such as limited application scenarios, high cost, and complex structure of the interference spectrometer system, and achieve the effects of simplifying the system structure, reducing requirements, and reducing performance requirements
Active Publication Date: 2020-12-25
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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[0005] Based on the above-mentioned background technology, the present invention proposes an interference spectroscopy system based on bandpass sampling technology and a method for obtaining target spectrum information, which breaks through the Nyquist sampling limitation for interferometric spectrometer interferogram sampling and realizes wide-spectrum and high-resolution for traditional interferometric spectrometers. Provides a solution for rate detection, so as to solve the technical problems of complex structure, high cost and limited application scenarios of the interferometric spectrometer system
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[0044] The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.
[0045] Such as figure 1 As shown, the present invention proposes a kind of interference spectroscopy system based on band-pass sampling technology, including a pre-optical system 1, an aperture 2 with an aperture below 1mm (which can avoid the aliasing of the pre-dispersed spectrum, and ensure that the subsequent dispersion and parallel The converted spectrum can be arranged in sequence according to the wavelength), the collimating mirror group 3, the dispersion unit 4, the interferometer unit 5, and the photodetector 6.
[0046] The pinhole 2 is located on the output optical path of the front optical system 1, the collimating mirror group 3 is located on the output optical path of the light emitted from the aperture 2, the dispersion unit 4 is located on the output optical path of the collimating mirror group 3, and the interferometer unit 5 is ...
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The invention provides an interference spectrum system based on a band-pass sampling technology and a target spectrum information acquisition method, and aims to solve the technical problems of complex structure, high cost and limited application scene of an interference spectrometer system. The method comprises the following steps of: performing dispersion preprocessing on a broadband spectrum signal through a dispersion unit to obtain a broadband signal distributed by a wavelength function; performing interference modulation on the broadband signal through an interferometer unit; performinginterval sampling according to the requirements of the band-pass sampling technology; collecting interference pattern information by a photoelectric detector; dividing the interference pattern information collected by the photoelectric detector into interference pattern information corresponding to a plurality of narrow-band signals at equal intervals; and processing and inverting the interferencepattern information obtained by equal interval division to obtain spectrum distribution corresponding to a detection target. Compared with a Nyquist sampling technology, the interference spectrum system has the advantages that sampling is allowed to be performed at a larger sampling interval, the data volume is reduced, and the interference spectrum system has huge potential of satellite-borne spectrum detection application.
Description
technical field [0001] The invention relates to the field of spectrum testing, in particular to an interference spectrum system based on bandpass sampling technology and a method for acquiring target spectrum information. Background technique [0002] The interferometric spectrometer is based on the principle of light wave interference. By measuring the interferogram of the target and performing Fourier inverse transformation on the interferogram of the measured target, the spectral information of the target can be obtained. The interferometric spectrometer can indirectly obtain the spectral information of the target, and has the obvious advantages of multi-channel, high throughput, high detection accuracy and low stray light. [0003] The traditional Michelson-type interferometric spectrometer is a time-integrated interferometric spectrometer, which generates an optical path difference through the movement of the moving mirror, and then obtains a complete interferogram thro...
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IPC IPC(8): G01J3/45
CPCG01J3/45G01J2003/451
Inventor 李思远田飞飞王鹏冲张宏建张周锋
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI