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Light Intensity Adaptive Laser Doppler Velocimeter

A Doppler velocimeter and self-adaptive technology, which is applied in the direction of instruments, measuring devices, radio wave measuring systems, etc., can solve problems such as lost signals, signal waveforms exceeding the screen, etc., to improve the instability of the signal-to-noise ratio and the signal-to-noise ratio Poor, avoid the inconvenience of manual adjustment, avoid the effect of super screen signal loss

Active Publication Date: 2018-04-27
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a light intensity adaptive laser Doppler velocimeter to solve the problem that the signal waveform of the existing laser Doppler velocimeter exceeds the screen and loses the signal during the detonation loading test

Method used

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  • Light Intensity Adaptive Laser Doppler Velocimeter
  • Light Intensity Adaptive Laser Doppler Velocimeter
  • Light Intensity Adaptive Laser Doppler Velocimeter

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1 provides a light intensity adaptive laser Doppler velocimeter, figure 2 The principle structure diagram of the light intensity adaptive laser Doppler velocimeter provided for Embodiment 1, such as figure 2 As shown, it includes a laser 1, a fiber beam splitter 2, a fiber probe 3, a fiber coupler 4, a circulator 15, and a feedback module for automatic gain adjustment of light intensity.

[0032] The light intensity automatic gain adjustment feedback module includes a light intensity modulator 5 , a controller 6 , a differential comparator 7 , a photoelectric converter 8 , a photoelectric converter 9 , an optical fiber splitter 10 , an optical fiber splitter 11 , and a photoelectric converter 12 .

[0033] One output end of the optical fiber splitter 2 is connected to the input end of the optical fiber splitter 10, the other output end of the optical fiber splitter 2 is connected to the port a of the circulator 15, and the port b of the circulator 15 is con...

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Abstract

The invention relates to the technical field of photoelectric transient tests, and provides a light-intensity-adaptive laser Doppler speed meter used for solving the problems that in the explosive loading test process of an existing laser Doppler speed meter, the signal waveform gets beyond a screen, and signals are lost.The light-intensity-adaptive laser Doppler speed meter comprises a laser device, a first optical fiber beam splitter, a circulator, an optical fiber probe, an optical fiber coupler and an automatic light intensity gain adjustment feedback module.The automatic light intensity gain adjustment feedback module comprises a light intensity modulator, a controller, a differential comparator, a first photoelectric converter, a second photoelectric converter, a second optical fiber beam splitter, a third optical fiber beam splitter and a third photoelectric converter.According to the technical scheme, it is guaranteed that interference signals acquired by the laser Doppler speed meter are in a stable state all the time, and the defect that a laser Doppler speed meter is unstable and poor in signal-to-noise ratio is overcome; besides, loss, caused by sudden light intensity changing, of signals getting beyond a screen is avoided, and the problem that effective signals of a laser Doppler speed meter in the prior art are lost is solved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric transient testing, in particular to a light intensity self-adaptive laser Doppler velocimeter. Background technique [0002] Laser Doppler velocimetry technology is a transient velocity history detection technology that has gradually emerged and developed rapidly in recent years. Due to its non-contact and continuous measurement characteristics, it has been widely used in various detonation loading experiments. The transient velocity evolution process of the target surface of the measured object is used to accurately analyze the detonation physical process. [0003] The laser Doppler velocimetry technology used in the detonation physics experiment is a kind of all-fiber transient velocimetry instrument using the communication band wavelength laser as the light source and the miniature fiber optic probe as the end sensor. figure 1 It is a schematic structural diagram of a laser Doppler veloc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/58G01S7/491
CPCG01S7/4918G01S17/58
Inventor 陈浩玉文雪峰汤铁钢莫俊杰金山张茹蒲国红
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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