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

Speed measurement method and system based on double etalons

An etalon and speed measurement technology, which is applied in the direction of radio wave measurement system, test/calibration of speed/acceleration/shock measurement equipment, measurement device, etc., can solve the problems that the pulse frequency jitter cannot be corrected, the cost is expensive, and the system is huge , to achieve the effects of reducing pulse frequency jitter, easy measurement, and cost reduction

Inactive Publication Date: 2016-09-28
NANJING UNIV OF INFORMATION SCI & TECH
View PDF10 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, in lidar applications, since the system uses the average lidar signal, the pulse frequency jitter of the pulse cannot be corrected, and its structure is complex, the system is large and expensive

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
  • Speed measurement method and system based on double etalons
  • Speed measurement method and system based on double etalons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the dual etalon-based speed measuring system of the present invention includes a laser emitting system, a laser receiving system and a photoelectric detection system. The laser emitting system includes a laser 1 , a beam expander 2 , a mirror M1 , and an emitting etalon 3 . The laser receiving system includes a receiving lens 4, a collimating mirror 5, a beam splitting mirror 6, a reflecting mirror M2, a receiving etalon 7, a converging mirror b8, and a converging mirror a9. The photoelectric detection system includes a photomultiplier tube a 11 , a photomultiplier tube b 10 , a high-speed AD acquisition card 12 and a computer 13 . The laser 1 emits the laser beam and expands the laser beam through the beam expander 2. The laser beam is incident on the emitting etalon 3 through the mirror M1, and then the laser is calibrated and sh...

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 speed measurement method and system based on double etalons. The method comprises the steps: carrying out the inversion of the speed of a to-be-measured target object through measuring the Doppler frequency shift of an echo signal, returned by the to-be-measured target object, of a laser beam; enabling the laser beam to form a plurality of narrow band laser beams with the split frequencies through a receiving etalon, and irradiating the to-be-measured target object; enabling the echo signal to be divided into two ways, wherein one way passes through the receiving etalon and a Doppler frequency shift detection signal is obtained, and the other way serves as a reference light signal; and obtaining the speed of the to-be-measured target object through the comparison of the Doppler frequency shift detection signal and the reference light signal. The system is simple in structure, and exerts low requirements on the laser line width and the frequency stability.

Description

technical field [0001] The invention relates to a method and system for measuring Doppler frequency shift by using double etalons. Background technique [0002] Doppler wind lidar uses the Doppler effect of light to measure the Doppler frequency shift of the echo signal transmitted by the laser beam in the atmosphere to retrieve the spatial wind speed distribution. There are two detection methods of Doppler wind lidar: coherent (heterodyne) detection and incoherent (direct) detection. Heterodyne detection uses the beat frequency signal of local oscillator light and signal light to measure the Doppler frequency shift of the laser. The measurement accuracy is relatively high, but the requirements for laser linewidth, frequency stability and optical alignment are quite strict. The direct detection method is mainly based on the edge technology laser Doppler frequency shift measurement method of the Fabry-Perot (F-P) interferometer, which converts the measurement of the light wa...

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): G01S7/497G01S17/58G01P5/26G01P21/02
CPCG01S7/497G01P5/26G01P21/025G01S17/58
Inventor 卜令兵张晋茹黄兴友郜海阳
Owner NANJING UNIV OF INFORMATION SCI & 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

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