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Micro-impulse measuring method based on multi-beam laser heterodyne second harmonic method and torsion pendulum method

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

Inactive Publication Date: 2012-01-18
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 multi-beam laser heterodyne, the present invention provides a multi-pulse based on torsion method. A Method for Measuring Micro-Impulse by Beam Laser Heterodyne Second Harmonic

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

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specific Embodiment approach 1

[0066] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this specific embodiment, the method for measuring micro-impulse based on multi-beam laser heterodyne second harmonic method and torsion pendulum method, it is to adopt the system of multi-beam laser heterodyne second harmonic measurement micro-impulse based on torsion pendulum method to realize, The system 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 signal processing system 1;

[0067] 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...

specific Embodiment approach 2

[0129] 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 signal processing system 1 is composed of a filter 17, a preamplifier 16, an analog-to-digital converter A / D and a digital signal processor DSP, and the filter 17 processes the signal output by the photodetector 2 Send to preamplifier 16 after filtering, and this preamplifier 16 sends to analog-to-digital converter A / D after the signal amplifying that receives, and analog-to-digital converter A / D converts the analog signal that receives into digital signal and sends to A digital signal processor DSP, the digital signal processor DSP is solidified with FFT algorithm, and the digital signal processor DSP is used t...

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Abstract

The invention relates to a micro-impulse measuring method, in particular to a micro-impulse measuring method based on a multi-beam laser heterodyne second harmonic method and a torsion pendulum method. The micro-impulse measuring method solves the problem of low measurement accuracy caused by poor laser difference frequency signal acquisition effect and low signal processing speed when the existing method of using multi-beam laser heterodyne to measure micro-impulses is adopted. By using the multi-beam laser heterodyne second harmonic method in the micro-impulse measuring method, the measurement of the micro-impulses is converted into the measurement of the swinging angle of a torsion pendulum, the information of the swinging angle to be measured can be obtained indirectly through the measurement of the thickness of a standard plane mirror, the measurement accuracy is effectively improved, the measured impulses are in a linear relation with the incident angles when a rotating angle issmaller than 5 degrees, the measurement error is smaller than 0.5 percent, the requirement on the measurement of the impulse of a laser micro-thruster can be satisfied, and a very good measurement means for evaluating the performance of the laser micro-thruster is provided.

Description

technical field [0001] The invention relates to a method for measuring micro-pulse. 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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