Micro impulse measuring apparatus using torsion pendulum method of using Doppler vibrating mirror to carry out sine modulation on multiple-beam laser heterodyne and method thereof

A Doppler galvanometer and laser heterodyne technology, which is applied in measurement devices, optical devices, force/torque/work measuring instruments, etc., can solve the problems of low measurement accuracy and singleness of the parameter values ​​to be measured.

Inactive Publication Date: 2012-02-15
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing method of measuring the micro-impulse of the micro-thruster by using the heterodyne interferometry can only obtain a single parameter value to be measured, so that the measurement accuracy of the parameter value to be measured is low, and provides a Doppler Device and method for measuring micro-impulse by oscillating multi-beam laser heterodyne modulation by galvanometer

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  • Micro impulse measuring apparatus using torsion pendulum method of using Doppler vibrating mirror to carry out sine modulation on multiple-beam laser heterodyne and method thereof
  • Micro impulse measuring apparatus using torsion pendulum method of using Doppler vibrating mirror to carry out sine modulation on multiple-beam laser heterodyne and method thereof
  • Micro impulse measuring apparatus using torsion pendulum method of using Doppler vibrating mirror to carry out sine modulation on multiple-beam laser heterodyne and method thereof

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specific Embodiment approach 1

[0078] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the device for measuring micro-impulse by Doppler vibrating mirror sinusoidally modulating multi-beam laser heterodyning in this embodiment, the device is composed of a digital signal processing system 1, a photodetector 2, a pulse laser 6, a torsion System, H 0 Composed of a solid-state laser 10, a polarizing beam splitter PBS11, a quarter-wave plate 12, a vibrating mirror 13, a plane standard mirror 14 and a converging lens 15,

[0079] 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 first vacuum window 3 and The second vacuum window 5, the torsion pendulum system is composed of a standard beam 8, a plane reflector 9 and a working medium target 7; a plane reflector 9 is pasted on the...

specific Embodiment approach 2

[0083] Specific embodiment two: this embodiment is a further description to embodiment one, digital signal processing system 1 is made up of filter 17, preamplifier 16, analog-to-digital converter A / D and digital signal processing controller DSP, filter 17 filters the signal output by the photodetector 2 and sends it 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 will receive The received analog signal is converted into a digital signal and sent to the digital signal processing controller DSP. The FFT algorithm is solidified in the digital signal processing controller DSP. The digital signal processing controller DSP is used to process the continuously received signal. After demodulation Obtain the micro-impulse received by the beam of the standard beam 8.

specific Embodiment approach 3

[0084] Specific embodiment three: this embodiment is a further explanation to embodiment one or two, and described vibrating mirror 13 is a Doppler vibrating mirror, and its simple harmonic vibration equation and velocity equation are x (t)=x respectively 0 cos(ω c t) and v(t) = -ω c x 0 sin(ω c t),

[0085] where x 0 is the vibration amplitude of the Doppler galvanometer, ω c is the angular frequency of the Doppler galvanometer, c is the speed of light, and t is time.

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Abstract

The invention provides a micro impulse measuring apparatus using a torsion pendulum method of using Doppler vibrating mirror to carry out sine modulation on multiple-beam laser heterodyne and a method thereof, belonging to the micro impulse measuring technology field. According to the apparatus and the method in the invention, a problem that employing a method of using heterodyne interferometry to measure micro impulse of a micro thruster, only a single property value to be measured can be obtained, and measuring precision of the property value to be measured is low is solved. The apparatus in the invention comprises a digital signal processing system, a photoelectric detector, a pulse laser, a torsion pendulum system, an HO solid state laser, a polarization beam splitter (PBS), a quarter-wave plate, a vibrating mirror, a plane standard mirror and a convergent lens. The method comprises the following steps: opening the HO solid state laser and the vibrating mirror, and employing the pulse laser to send a pulse laser excitation working medium target to enable a crossbeam of a standard beam to rotate; collecting a signal sent by the photoelectric detector with the digital signal processing system, carrying out processing on all continuously obtained signals, and obtaining micro impulse received by the crossbeam of the standard beam. The apparatus and the method are applied to the measurement of the micro impulse.

Description

technical field [0001] The invention relates to a device and a method for measuring micro-impulse by a Doppler vibrating mirror sinusoidally modulating multi-beam laser heterodyne and a torsion method, belonging to the technical field of micro-impulse measurement. 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-thruster; ] Related studies have also been carried out. Judging ...

Claims

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Application Information

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IPC IPC(8): G01L5/00G01B11/26
Inventor 李彦超王春晖高龙曲杨丛海芳邵文冕
Owner HARBIN INST OF TECH
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