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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 low measurement accuracy, poor laser difference frequency signal collection effect, slow signal processing operation speed, etc. question

Inactive Publication Date: 2012-02-01
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 1. Combination figure 1 and figure 2 Describe this specific embodiment, the method for measuring the micro-impulse by multi-beam laser heterodyne second harmonic based on torsion method, it is to adopt the system of multi-beam laser heterodyne second harmonic measurement micro-impulse based on torsion method to realize, so The system described includes H 0 Solid-state laser 10, torsion system, quarter-wave plate 12, vibrating mirror 13, polarizing beam splitter PBS11, converging lens 15, pulsed laser 6, planar standard mirror 14, photodetector 2 and digital signal processing system 1;

[0065] 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...

specific Embodiment approach 2

[0124] Specific Embodiment 2. The difference between this specific embodiment and the method for measuring micro-impulse by multi-beam laser heterodyne second harmonic based on the torsion method described in the first embodiment is that the multi-beam laser heterodyne second harmonic based on the torsion method In the system for harmonic measurement of micro-pulse, 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, and the filter 17 converts the output of the photodetector 2 After the signal is filtered, it is sent to the preamplifier 16, and the preamplifier 16 amplifies the received signal and sends 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 Send it to the digital signal processing controller DSP, the digital signal processing controller DSP is solidified with th...

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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 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 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, the Photonic Associates group Phipps et al. proposed to use the torsion system to measure the tiny impulse generated by the laser micro-thruster, and use it to test the performance parameters of the micro-thrust; Research. Judging from the research results reported at home and abroad, on the one hand, the noise of the measurement system will affect the accuracy of the system. At the small impulse level, the system error even reaches 50%. Plane...

Claims

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Application Information

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Patent Type & Authority Applications(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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