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

Photoacoustic-cell weak-photoacoustic-signal detection method based on Duffing system

A detection method and signal detection technology, which are applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of complex operation, low cost, high sensitivity, etc., and achieve the effect of simple operation mode.

Inactive Publication Date: 2014-12-31
CENT SOUTH UNIV
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of existing weak signal detection methods such as high cost, complicated operation or poor sensitivity, and low real-time performance, the present invention provides a new detection method, which not only solves the above problems, but also has high sensitivity and low cost

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
  • Photoacoustic-cell weak-photoacoustic-signal detection method based on Duffing system
  • Photoacoustic-cell weak-photoacoustic-signal detection method based on Duffing system
  • Photoacoustic-cell weak-photoacoustic-signal detection method based on Duffing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation process, but the protection scope of the present invention is not limited to the following embodiments.

[0035] The overall structure diagram of the weak signal detection system based on the photoacoustic cell provided by the present invention is as follows figure 1 shown, including the following parts:

[0036] 1. Gas collection unit

[0037] 2. Photoacoustic unit

[0038] 3. Signal detection processing unit

[0039] 1: Gas collection unit

[0040] The gas collection unit is the basic part of the detection system. The gas collection unit is used to collect pollution source gas samples and store them for subsequent detection.

[0041] Two: photoacoustic unit

[0042] The photoacoustic unit is the key part of the photoacoustic effect. Different gases have different absorption lines and different laser wavelengths. The pollution ...

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 photoacoustic-cell weak-photoacoustic-signal detection method based on a Duffing system. The method comprises: performing detection based on the sensitivity of the Duffing system to a same-frequency weak signal and noise immune performance of the Duffing system, observing phase diagram variation, and finally utilizing the driving-force amplitude for two times to perform subtraction, so as to obtain the amplitude of the weak photoacoustic signal. The concrete steps comprise: firstly setting the frequency of the driving force signal and a to-be detected signal to be same, changing the driving force, observing the phase diagram, and recording the value at the moment of a large-scale period state; then adding the to-be detected signal, adjusting the driving force again to obtain the large-scale period state again, and recording the value at the moment; and finally performing subtraction on the two amplitudes, so as to obtain the weak photoacoustic signal amplitude. The method realizes real-time high-sensitivity visual detection, has extremely good social and economic benefit, and is applicable to detection of pollution source gases.

Description

Technical field [0001] The invention relates to a precision scientific detection instrument widely used in multiple fields such as physics, chemistry, biology, medicine, chemical industry, environmental protection, etc., and specifically relates to a photoacoustic weak signal detection method for detection of pollution source gases. Background technique [0002] With the development of pollution source gas detection system, photoacoustic spectroscopy detection technology [1，2] It has become a key technology for the detection of pollution source gases in environmental protection. The detection accuracy of photoacoustic signals has been paid more and more attention by people. As a key point in photoacoustic spectroscopy detection, weak signal detection is also in constant development [0003] Existing weak signal detection methods and technologies mainly include: (1) Time-domain-based detection methods: correlation detection, sampling integration, and time-domain averaging. ...

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): G01N21/17
Inventor 许雪梅戴鹏杨兵初陶少华李奔荣
Owner CENT SOUTH UNIV
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com