Double-beam laser Doppler velocity measurement system adopting phase modulator

A phase modulator and speed measurement technology, applied in the field of optical measurement, can solve the problems of high cost and complicated speed measurement system technology, and achieve the effect of reducing technical complexity and cost

Pending Publication Date: 2020-01-14
北京微厘光电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of velocity measuring instrument has two beams: one consists of light waves (lasers) emitted from different sources - called pulses). One beam travels faster when there are no obstacles between them or if they have any debris on their way through it's pathway. Another beam goes slower because its own motion causes interference patterns around other objects like trees or buildings along roadways. These techniques help measure both forward movement and backward movements accurately by detecting changes caused by these disturbances.

Problems solved by technology

Technological Problem: Current Laser Detection System's Optical Path Structure involves combining multiple laser signals together through an interference process called cohotropic effect. However, current methods require many components like filters and amplifiers, making them difficult to miniaturized due to their large sizes. Additionally, these techniques may result in increased noise levels during measurements.

Method used

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  • Double-beam laser Doppler velocity measurement system adopting phase modulator
  • Double-beam laser Doppler velocity measurement system adopting phase modulator
  • Double-beam laser Doppler velocity measurement system adopting phase modulator

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings, but it is not intended to limit the present invention.

[0023] refer to figure 1 As shown, the dual-beam laser Doppler velocimetry system using the phase modulator disclosed in the embodiment of the present invention is composed of an infrared semiconductor laser 1, a red light indicating semiconductor laser 2, a coupler 3, a phase modulator 4, and a first collimator. The lens 5, the second collimating lens 6, the receiving lens 7, the infrared light detector 8, and the optical fiber 10 are composed.

[0024] The infrared semiconductor laser 1 and the red light indicating semiconductor laser 2 are respectively connected to one end of the coupler 3 through their respective two optical fibers. The red light from the red light indicating semiconductor laser 2 is coupled into the lithium niobate phase modulator 4 through the coupler 3, and then divided into two beam

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Abstract

The invention belongs to the field of optics, and discloses a double-beam laser Doppler velocity measurement system adopting a phase modulator. The double-beam laser Doppler velocity measurement system comprises an infrared semiconductor laser, a red light indicating semiconductor laser, a coupler, the phase modulator, a first collimating lens, a second collimating lens, a receiving lens and an infrared light detector, wherein the infrared semiconductor laser and the red light indicating semiconductor laser are connected with one end of the coupler by means of optical fibers respectively, theother end of the coupler is connected with the phase modulator by means of an optical fiber, the phase modulator divides conducted infrared laser into two uniform paths, the two paths of infrared laser are conducted to the front end of the first collimating lens and the front end of the second collimating lens by means of optical fibers respectively, and light reflected by a moving object is focused to the infrared light detector by means of the receiving lens. The double-beam laser Doppler velocity measurement system solves the problems of complex technology and high cost of an original velocity measurement system adopting an acousto-optic frequency shifter for frequency shift.

Description

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Claims

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Application Information

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Owner 北京微厘光电技术有限公司
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