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Second harmonic multi-beam laser heterodyne measurement method for micro impulse based on doppler oscillating mirror sinusoidal modulation

A Doppler galvanometer and laser heterodyne technology, which is used in measurement devices, force/torque/work measuring instruments, instruments, etc., can solve the problems of poor quality of collected laser difference frequency signals and slow signal processing operation speed.

Inactive Publication Date: 2012-02-15
HARBIN INST OF TECH
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Problems solved by technology

[0006] In order to solve the problem that the existing laser heterodyne method has poor quality of collecting laser difference frequency signal and slow operation speed of signal processing when measuring micro-impulse, the proposed Doppler vibrating mirror sinusoidal modulation multi-beam laser heterodyne secondary The Method of Harmonic Measuring Micro-Impulse

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  • Second harmonic multi-beam laser heterodyne measurement method for micro impulse based on doppler oscillating mirror sinusoidal modulation
  • Second harmonic multi-beam laser heterodyne measurement method for micro impulse based on doppler oscillating mirror sinusoidal modulation
  • Second harmonic multi-beam laser heterodyne measurement method for micro impulse based on doppler oscillating mirror sinusoidal modulation

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specific Embodiment approach 1

[0074] Specific implementation mode one: combine figure 1 Describe this embodiment, the method for measuring micro-impulse with Doppler vibrating mirror sinusoidally modulating multi-beam laser heterodyne second harmonic in this embodiment, it adopts Doppler vibrating mirror sinusoidally modulating multi-beam laser external It is realized by a system for measuring micro-pulse with second harmonic difference, and the system includes a H0 solid-state laser 10, a torsion system, a quarter-wave plate 12, a vibrating mirror 13, a polarizing beam splitter PBS11, a converging lens 15, and a pulse laser 6 , a flat standard mirror 14, a photodetector 2 and a signal processing system 1;

[0075] Wherein said pulse laser 6, H0 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. There is a vacuum window 3. The torsion ...

specific Embodiment approach 2

[0138] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in the system for measuring micro-impulse with Doppler vibrating mirror sinusoidally modulated multi-beam laser heterodyne second harmonic based on the torsion method, the signal processing system 1 consists of Filter 17, preamplifier 16, analog-to-digital converter A / D and digital signal processor DSP are formed, and filter 17 sends to preamplifier 16 after filtering the signal that photodetector 2 outputs, and this preamplifier 16 The received signal is amplified and sent 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 digital signal processor DSP, which is solidified in the digital signal processor DSP There is an FFT algorithm, and the digital signal processor DSP is used to process the continuously received signals, and obtain the micro-impulse received by the bea...

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Abstract

The invention relates to a method for measuring a micro impulse, more particularly to for a second harmonic multi-beam laser heterodyne measurement method for a micro impulse based on doppler oscillating mirror sinusoidal modulation. The invention aims at solving a problem of poor qualities of collected laser difference frequency signals and slow operation speeds of signal processing during microimpulse measurement in the current laser heterodyne method. According to the method, a pulsed laser emits a pulse laser excitation working medium target that generates plasma injection, and the plasma injection enables a crossbeam of a standard beam to make rotations; driving powers of an H0 solid state laser and an oscillating mirror are started; the oscillating mirror, which is driven by the driving power, makes simple harmonic motions and carries out modulation on optical frequencies that are incident to the front surface of the oscillating mirror at different times; and a signal processing system collects continuously signals emitted by a photoelectric detector during a swing process of a torsion pendulum system and also carries out processing on all continuously obtained signals, so that a micro impulse I exerted on the crossbeam of the standard beam is obtained. According to the invention, the method has advantages of high qualities of collected laser difference frequency signals and a fast operation speed during signal processing.

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, ...

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Application Information

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IPC IPC(8): G01L5/00
Inventor 王春晖李彦超
Owner HARBIN INST OF TECH
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