Light field matching heterodyne detection device and method based on array detector

An array detector and heterodyne detection technology, which is applied in the direction of measuring devices, measuring optics, instruments, etc., can solve the problems of long detection time, heterodyne detection, and no enhanced signal-to-noise ratio, so as to improve the signal-to-noise ratio and facilitate operation Effect

Inactive Publication Date: 2015-04-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this detection system has relatively large defects. It can only perform heterodyne detection on the spatial mismatch angle, and because the effective quantum efficiency function is constantly changing for scanning detecti

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
  • Light field matching heterodyne detection device and method based on array detector
  • Light field matching heterodyne detection device and method based on array detector
  • Light field matching heterodyne detection device and method based on array detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The heterodyne efficiency of heterodyne detection is a general index to measure the signal-to-noise ratio of a detection system. For array detectors, the signal-to-noise ratio can be described as

[0021] ( S N ) = R × Γ

[0022] where R = ηP s f S / hvB IF ,

[0023]

[0024] In the formula, h is Planck's constant, v is the optical frequency, η is the quantum efficiency of the detector, and P s is the signal optical power, B IF is the bandwidth of heterodyne IF signal, F S is the proportion of signal light incident on the photosensitive surface of the detector, U S is the light field distribution function of the signal, U l is the optical field distribution function of local oscillator light, U j is the gain coefficient of the jth unit in the array detector, A is the photosensitive area of ​​the array detector, is the phase differe...

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 discloses a light field matching heterodyne detection device and method based on an array detector, and belongs to the field of laser heterodyne detection, especially continuous heterodyne detection capable of utilizing the array detector for carrying out light field matching correction on signal light and local oscillator light. The signal-to-noise ratio of heterodyne detection can be improved. A light signal is received through the array detector, weighted stacking is carried out on receiving signals of all units of the array detector, and finally a total intermediate frequency signal obtained after stacking is output. In the target detection process, firstly, the signal light reflected back by a target is independently received, then the local oscillator light is independently received, weighting coefficients of all the detection units in the array detector are calculated according to detected light field distribution of the signal light and the local oscillator light, then the signal light and the local oscillator light are received at the same time, weighted stacking is carried out on detection signals output by the detection units according to the calculated weighing coefficients, and finally a composite signal obtained after stacking is output. Therefore, the effect of improving the signal-to-noise ratio of heterodyne detection and the effect of easy and convenient operation are achieved.

Description

technical field [0001] The invention belongs to the field of laser heterodyne detection, in particular, the array detector can be used to perform continuous heterodyne detection of light field matching correction between signal light and local oscillator light, and the signal-to-noise ratio of heterodyne detection can be improved. Background technique [0002] Laser heterodyne detection has many advantages, but the performance of this technique is limited by various factors. Factors such as atmospheric turbulence, receiving system aberration, and the angle between the signal light and the local oscillator light will cause the signal-to-noise ratio of heterodyne detection to decrease. These factors can be described as the mismatch between the signal light and the local oscillator light field. [0003] In a research document published in 2012 (Dong Hongzhou, Ao Mingwu, Yang Ruofu, etc. Research on space mismatch angle matching heterodyne detection based on array detectors [J] ...

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
IPC IPC(8): G01J9/02
Inventor 董洪舟杨若夫杨春平敖明武
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap