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Method for measuring micro-impulse based on multi-beam laser heterodyne second harmonic method and torsion pendulum method

A laser heterodyne, second harmonic technology, applied in force/torque/work measuring instruments, measuring devices, instruments, etc., can solve the problem of slow signal processing operation speed, low measurement accuracy, poor laser difference frequency signal collection effect, etc. question

Inactive Publication Date: 2013-04-24
HARBIN INST OF TECH
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Problems solved by technology

[0006] In order to solve the problem of low measurement accuracy caused by poor acquisition effect of laser difference frequency signal and slow operation speed of signal processing in the existing method of measuring micro-impulse by using multi-beam laser heterodyne, the present invention provides a multi-beam laser heterodyne based method. Method of Measuring Micro Impulse by Difference Second Harmonic Method and Torsion Pendulum Method

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  • Method for measuring micro-impulse based on multi-beam laser heterodyne second harmonic method and torsion pendulum method
  • Method for measuring micro-impulse based on multi-beam laser heterodyne second harmonic method and torsion pendulum method
  • Method for measuring micro-impulse based on multi-beam laser heterodyne second harmonic method and torsion pendulum method

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specific Embodiment approach 1

[0064] Specific implementation mode one, combination figure 1 with figure 2 In this specific embodiment, the method for measuring the micro-impulse of the second harmonic of a multi-beam laser heterodyne method based on the torsion pendulum method is implemented by adopting a system of measuring the micro-impulse of the second harmonic of a multi-beam laser heterodyne method based on the torsion pendulum method. The system includes H 0 Solid-state laser 10, torsion pendulum system, quarter wave plate 12, galvanometer 13, polarization beam splitter PBS11, converging lens 15, pulse laser 6, plane standard mirror 14, photodetector 2 and digital signal processing system 1;

[0065] Where the H 0 The solid-state laser 10, the torsion pendulum system, the quarter wave plate 12, the galvanometer 13, the polarization beam splitter PBS11, the convergent lens 15 and the plane standard mirror 14 are located in the vacuum chamber 4, which has a vacuum window 3, so The torsion pendulum system...

specific Embodiment approach 2

[0124] Specific embodiment two, the difference between this specific embodiment and the method for measuring micro impulse based on the torsion pendulum method for the second-harmonic multi-beam laser heterodyne method described in the first embodiment is that the multi-beam laser heterodyne second-order method based on the torsion pendulum method In the harmonic measurement micro-impulse system, the digital signal processing system 1 is composed of a filter 17, a preamplifier 16, an analog-to-digital converter A / D and a digital signal processing controller DSP. The filter 17 outputs the photodetector 2 The signal is filtered and sent to the preamplifier 16. The preamplifier 16 amplifies the received signal and sends it to the analog-to-digital converter A / D. The analog-to-digital converter A / D converts the received analog signal into a digital signal Send to the digital signal processing controller DSP, the FFT algorithm is solidified in the digital signal processing controller...

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Abstract

The invention discloses a method for measuring micro-impulse based on a multi-beam laser heterodyne second harmonic method and a torsion pendulum method, relates to a micro-impulse measurement method, and solves the problem of low measurement accuracy caused by poor effect of acquiring a laser difference frequency signal and low operation speed of signal processing in the conventional method for measuring the micro-impulse by using the multi-beam laser heterodyne second harmonic method. The multi-beam laser heterodyne second harmonic method is applicable to the micro-impulse measurement method; the measurement of the micro-impulse is converted into the measurement of a pendulum angle of torsion pendulum, and the size of the micro-impulse is obtained by directly measuring the pendulum angle of the torsion pendulum by using the multi-beam laser heterodyne second harmonic method, so measurement accuracy is effectively improved; when a rotating angle is smaller than 5 DEG, the measured micro-impulse has a linear relation with an incident angle, and a measurement error is smaller than 0.5 percent; requirements for measurement of the impulse of a laser micro-thruster can be met; and good measurement means can be provided for evaluation of the performance of the laser micro-thruster.

Description

Technical field [0001] The present invention relates to a method for measuring micro impulse. Background technique [0002] Laser micro thrusters have broad and in-depth application prospects in the field of micro-satellite attitude and orbit control. They have high specific impulse, large impulse dynamic range, small minimum impulse, low power consumption, high energy coupling efficiency, easy realization, light weight and Significant advantages such as digital control have attracted wide attention from scholars at home and abroad. The impulse is an important parameter reflecting the performance of the laser micro-thruster, and it is characterized by a small magnitude, about 10 -7 ~10 -5 N·s. Photonic Associates group Phipps et al. proposed in 1999 to use a torsion pendulum system to measure the tiny impulse generated by a laser micro-thruster, and use it to test the performance parameters of the micro-thruster; then the domestic University of Science and Technology of China an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00
Inventor 李彦超王春晖高龙曲杨张峰
Owner HARBIN INST OF TECH
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