Multi-laser-beam heterodyne micro-impulse-measuring device and method

A technology of laser heterodyne and measurement method, which is applied to measuring devices, force/torque/power measuring instruments, instruments, etc., can solve the problems of reduced energy coupling efficiency and large system errors, so as to improve performance, improve accuracy, and meet test requirements. required effect

Inactive Publication Date: 2011-09-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of reduced energy coupling efficiency and large system errors existing in the existing small impu

Method used

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  • Multi-laser-beam heterodyne micro-impulse-measuring device and method
  • Multi-laser-beam heterodyne micro-impulse-measuring device and method
  • Multi-laser-beam heterodyne micro-impulse-measuring device and method

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specific Embodiment approach 1

[0015] Specific embodiment one: What this embodiment describes is a kind of device of multi-beam laser heterodyne measurement micro-impulse, and this device consists of H 0 Composed of a solid-state laser 10, a torsion system, a quarter-wave plate 12, a galvanometer 13, a polarizing beam splitter PBS11, a converging lens 15, a pulse laser 6, a plane standard mirror 14, an optical detector 2 and a signal processing system 1;

[0016] where the H 0 Solid-state laser 10, torsion system, quarter-wave plate 12, vibrating mirror 13, polarization beam splitter PBS11, converging lens 15 and plane standard mirror 14 are located in vacuum chamber 4, and this vacuum chamber 4 has a vacuum window 3, so The torsion pendulum system is composed of a standard beam 8, a plane reflector 9 and a working medium target 7; a plane reflector 9 is pasted on the plane at one end of the crossbeam of the standard beam 8, and the other end of the crossbeam opposite to the plane reflector 9 A working med...

specific Embodiment approach 2

[0023]Embodiment 2: This embodiment is a further limitation of the device for measuring micro-impulse by multi-beam laser heterodyne described in Embodiment 1. In this embodiment, the signal processing system 1 is composed of a filter 17, a preamplifier 16. Composed of analog-to-digital converter A / D and signal processing controller DSP, the filter 17 filters the signal output by the photodetector 2 and then sends it to the preamplifier 16, which amplifies the received signal Send it to the analog-to-digital converter A / D, and the analog-to-digital converter A / D converts the received analog signal into a digital signal and sends it to the signal processing controller DSP. The signal processing controller DSP is solidified with FFT algorithm, and the signal processing control The DSP is used to process the continuously received signal, and obtain the micro-pulse received by the beam of the standard beam 8 after demodulation.

specific Embodiment approach 3

[0024] Specific embodiment three: what this embodiment describes is the method for realizing micro-impulse measurement based on the above-mentioned multi-beam laser heterodyne measurement device for micro-impulse, the process of this method is:

[0025] First, the pulsed laser 6 is used to emit pulsed laser light to excite the working medium target 7, so that the working medium target 7 generates plasma jetting, and the backspray effect of the generated plasma jetting makes the crossbeam of the standard beam 8 rotate;

[0026] At the same time, open the H 0 The driving power of the solid-state laser 10 and the vibrating mirror 13;

[0027] Then, the signal processing system 1 continuously collects the signals emitted by the photodetector 2 during the swinging process of the torsion pendulum system, and processes all the continuously obtained signals to obtain the micro-impulse received by the beam of the standard beam 8 .

[0028] The signal processing system 1 continuously c...

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Abstract

The invention discloses a multi-laser-beam heterodyne micro-impulse-measuring device and a multi-laser-beam heterodyne micro-impulse-measuring method and relates to the technical field of micro impulse detection. By the device and the method, the problems of low energy coupling efficiency and big system error in the current small-impulse-measuring system are solved and the micro impulse measurement is carried out on the basis of a laser heterodyne technology and a Doppler effect. The method comprises the steps of: converting the micro impulse generated under the action of the laser and a target into a rotating angle of a torsional pendulum; then introducing a scanner into the measuring light path to attach an optical frequency to each of the light signals entering at different time points, so that a reflected light from the front surface of a planer standard lens and a transmitted light reflected by the front surface and the back surface of the planer standard lens for many times generate a multi-beam heterodyne interfering signal under an interfering condition; and thus modulating the change information of the rotating angle of a standard beam into the frequency difference of a medium-frequency heterodyne signal successfully. With polyvinyl chloride (PVC) and 2 percent of carbon (C) as working fluid, the micro impulse generated under the action of the laser and the working fluid is simulatively measured by using a torsional pendulum method and the measurement result shows that the maximum relative error of the measurement is less than 2.3 percent.

Description

technical field [0001] The invention relates to the technical field of micro-pulse detection, in particular to a device and a method for measuring micro-pulse by laser heterodyne method. Background technique [0002] Laser micro-thrusters have broad and in-depth application prospects in the field of attitude and orbit control of micro-satellites. Significant advantages such as digital control have attracted extensive attention from scholars at home and abroad. The impulse is an important parameter reflecting the performance of the laser micro thruster, which is characterized by a small magnitude, about 10 -7 ~10 -5 N·s. In 1999, Phipps et al. from the Photonic Associates group proposed to use the torsion pendulum system to measure the micro-impulse generated by the laser micro-thruster, and used it to test the performance parameters of the micro-thruster; in 2002, Phipps et al. improved the torsion system, and then The domestic University of Science and Technology of Chi...

Claims

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Application Information

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IPC IPC(8): G01L5/00
Inventor 李彦超王春晖高龙曲杨
Owner HARBIN INST OF TECH
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