Optical power control system, control method and laser Doppler velocimeter

An optical power control and optical power technology, applied in the field of laser Doppler velocimeters, can solve problems such as interference signal amplitude and baseline instability, oscilloscope test waveform over-screen, affecting test results, etc., to enhance the ability to transmit optical power , the effect of extending the test depth of field and improving the quality

Active Publication Date: 2016-08-10
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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AI Technical Summary

Problems solved by technology

[0002] At present, when the traditional laser Doppler velocimeter is used to measure the moving speed of the sample under detonation loading, since the emitted test light power is constant, the surface state (roughness, reflection angle, etc.) ) will change abruptly, and the optical power of the emitted light reflected back to the instrument through the surface of the tested sample changes with the surface state of the measured object. The interference signal amplitude and baseline Unstable, easy to cause the oscilloscope test waveform to appear beyond the screen or even signal loss, thus affecting the test results

Method used

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  • Optical power control system, control method and laser Doppler velocimeter
  • Optical power control system, control method and laser Doppler velocimeter
  • Optical power control system, control method and laser Doppler velocimeter

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Embodiment 1

[0038] figure 1 It is a functional block diagram of the optical power control system provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the optical power control system 1 includes an optical power reference input module 11 , a reflected optical power detection module 12 , a controller 13 , and an optical power adjustment module 14 . The controller 13 includes a difference module 131 and a control amount calculation module 132 . Specifically, the input end of the optical power adjustment module 14 receives the transmitted light, the input end of the optical power reference value input module 11 receives the reference light, the reflected optical power detection module 12 receives the reflected light, and the output end of the control amount calculation module 132 is connected to the optical power The electrical input end of the adjustment module is connected, an input end of the difference seeking module 131 is connected with the output end of the re...

Embodiment 2

[0045] Embodiment 2 provides an optical power control method, including the following steps.

[0046] Step (1): The optical power reference value input module receives the reference light emitted by the laser of the laser Doppler velocimeter and detects the reference optical power, converts the reference optical power information into an electrical signal and sends the electrical signal to the controller.

[0047] Step (2): The reflected light power detection module receives the reflected light and detects the reflected light power, converts the reflected light power information into an electrical signal, and sends the electrical signal to the controller;

[0048] Step (3): The controller calculates the difference between the reference optical power and the reflected optical power, calculates a control amount based on the difference in conjunction with a control algorithm, and sends the control amount to the optical power adjustment module. In this embodiment, the control algo...

Embodiment 3

[0051] Embodiment 3 provides a laser Doppler velocimeter, which includes the laser Doppler velocimeter optical power control system 1 in Embodiment 1.

[0052] figure 2 The functional block diagram of the laser Doppler velocimeter provided for embodiment three, as figure 2 As shown, it includes the optical power control system 1 in Embodiment 1, which also includes a laser 2, a first optical splitter 3, a circulator 4, a coupler 5, a photoelectric conversion module 6, a probe 7, a second optical splitter 8, The third optical splitter 9, the output end of the laser 2 is connected with the input end of the first optical splitter 3, an output end of the first optical splitter 3 is connected with the input end of the second optical splitter 8, and an output of the second optical splitter 8 end is connected with the optical power reference value input module 11, the other output end of the second optical splitter 8 is connected with the coupler 5, the other output end of the fir...

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Abstract

The invention relates to the technical field of photoelectric transient state testing and provides an optical control system, a control method and a laser Doppler velocimeter. The optical control system includes an optical power reference value input module, a reflected light power detection module, a controller and an optical power adjusting module. According to the technical scheme provided by the invention, dynamic adjustment of emitted light power can be performed according to the change of reflected light power, so that the reflected power is kept constant and is equal to or in a fixed proportion with the reference light power; amplitude stability and base line stability of coupling interference signals of reflected light and reference light can be ensured; a condition that a to-be-detected object can reflect light of sufficient power can be ensured; testing signal quality can be improved; signal-to-noise ratio of signals can be improved; and a phenomenon of signal loss caused by too weak reflected light can also be inhibited; and the testing reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric transient testing, and in particular relates to an optical power control system, a control method and a laser Doppler velocimeter. Background technique [0002] At present, when the traditional laser Doppler velocimeter is used to measure the moving speed of the sample under detonation loading, since the emitted test light power is constant, the surface state (roughness, reflection angle, etc.) ) will change abruptly, and the optical power of the emitted light reflected back to the instrument through the surface of the tested sample changes with the surface state of the measured object. The interference signal amplitude and baseline Unstable, easy to cause the oscilloscope test waveform to appear beyond the screen or even signal loss, thus affecting the test results. Contents of the invention [0003] 【Technical problems to be solved】 [0004] The object of the present invention is to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/58
CPCG01S17/58
Inventor 文雪峰陈浩玉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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