Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for increasing signal and noise ratio of atmospheric sounding Fourier spectrometer

An atmospheric detection and spectrometer technology, applied in the field of improving the signal-to-noise ratio of the spectrometer, can solve the problems that the analog filter cannot filter the quantization noise, the spectral bandwidth of the atmospheric detection spectrometer is narrow, and the noise of the detection spectral band is increased, so as to simplify the design difficulty and avoid Analog circuit design, effect of increasing sampling data rate

Active Publication Date: 2017-06-13
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
View PDF7 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Due to the limitation of the number and function of the analog filter chip and the limitation of special design software, the design of the analog filter is complicated and it is very difficult to adjust the parameters;
[0008] (2) The analog filter components themselves will also introduce noise;
[0009] (3) The spectral bandwidth of the atmospheric detection spectrometer is narrow, and the sampling frequency of the system is low, which makes the out-of-band noise easily aliased into the detection spectral band, increases the noise in the detection spectral band, and lowers the signal-to-noise ratio;
[0010] (4) The analog filter cannot filter out the quantization noise introduced by the sampling of the analog-to-digital converter;

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for increasing signal and noise ratio of atmospheric sounding Fourier spectrometer
  • Method for increasing signal and noise ratio of atmospheric sounding Fourier spectrometer
  • Method for increasing signal and noise ratio of atmospheric sounding Fourier spectrometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The basic idea of ​​the present invention is: to propose a method for improving the signal-to-noise ratio of the Fourier infrared spectrometer for atmospheric detection. Sampling, and subdividing each zero-crossing pulse cycle into several sub-pulses with equal time intervals, using the subdivided sub-pulses as trigger signals to realize oversampling of infrared interference signals, and sampling the collected infrared interference signals The time coordinate information of the point is transformed into the optical path difference coordinate information, and the equal optical path difference interpolation resampling calculation is performed on the sampled data between the zero crossing points, and the digital downsampling filter is performed on the resampled data. The method of the invention improves the data sampling frequency and realizes digital filtering, not only can eliminate aliasing noise and quantization noise in sampling, but also avoids noise introduced by ana...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for increasing a signal and noise ratio of an atmospheric sounding Fourier infrared spectrometer. The method comprises the following steps of according to the working principle of the Fourier infrared spectrometer, sampling a zero-crossing pulse of an interference signal of the Fourier infrared spectrometer by a high-frequency clock, dividing the cycle of each zero-crossing pulse into a plurality of subpulses with equal time intervals, and using each divided subpulse as a triggering signal, so as to realize the oversampling of the infrared interference signal; converting the time coordinate information of the collected infrared interference signal sampling point into optical path difference coordinate information, and performing equal-optical path difference interpolation resampling and calculation on the sampling data crossing zero, and performing digital downsampling filtering on the resampled data. The method has the advantages that the data sampling frequency is improved, the digital filtering is realized, the aliasing noise and quantizing noise in the sampling can be eliminated, the noise introduced by an analog filtering device is avoided, and the signal and noise ratio of the spectrometer is increased.

Description

technical field [0001] The invention relates to a method for improving the signal-to-noise ratio of a spectrometer. In particular, it is a method for improving the spectral signal-to-noise ratio of atmospheric detection Fourier spectrometers with high spectral resolution and weak interference signals. Background technique [0002] The Atmospheric Detection Fourier Infrared Spectrometer is a time-modulated infrared interferometer with Michelson interferometer as the core, which modulates the light by the mechanical swing motion of the moving mirror. The Fourier spectrometer can only directly obtain the interference curve of the target object, and the energy in a certain spectral segment is obtained through the Fourier transform of the interferogram, so the signal-to-noise ratio of each spectral wavenumber and the signal-to-noise ratio of the entire interferogram relevant. In the actual inversion analysis of spectrometer data, the accuracy of the calculation result of the ab...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01J3/45
CPCG01J3/45G01N21/3504G01N2021/3595
Inventor 王建宇荣鹏于双江苏浩航倪建军张磊闫静纯程甘霖黄竞
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products