Method for measuring micro impulse by Doppler galvanometer sine-modulated multi-beam laser heterodyne second harmonic

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

Inactive Publication Date: 2011-10-19
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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  • Method for measuring micro impulse by Doppler galvanometer sine-modulated multi-beam laser heterodyne second harmonic
  • Method for measuring micro impulse by Doppler galvanometer sine-modulated multi-beam laser heterodyne second harmonic
  • Method for measuring micro impulse by Doppler galvanometer sine-modulated multi-beam laser heterodyne second harmonic

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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 plane standard mirror 14, a photodetector 2 and a signal processing system 1;

[0075] Wherein said H0 solid-state laser 10, torsion system, quarter-wave plate 12, vibrating mirror 13, polarizing 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, the torsion pendulum system is mad...

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 discloses a method for measuring micro impulse by Doppler galvanometer sine-modulated multi-beam laser heterodyne second harmonic, relates to a method for measuring micro impulse and aims to solve the problems of low acquired laser difference frequency signal quality and low signal processing computing speed in the micro impulse measurement of conventional laser heterodyne methods. The method comprises the following steps of: exciting a working medium target to generate plasma jet to rotate a beam of a standard beam; starting a driving power supply of an H0 solid laser and a galvanometer, and causing the galvanometer to perform simple harmonic motion and modulate optical frequency incident to the front surface of the galvanometer at different moments under the action of the driving power supply; and continuously acquiring signals transmitted by an optoelectronic detector in the pendulum process of a torsional pendulum system, and processing all the continuously acquired signals to obtain the micro impulse to which the beam of the standard beam is subjected by using a signal processing system. The method has the prominent advantages of high acquired laser difference frequency signal quality and high signal processing computing speed.

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, 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 China and the Institute of Equipment Command Technology have also carried out related research. Judging fr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 王春晖李彦超
Owner HARBIN INST OF TECH
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