Device for adopting linear frequency modulation double beam laser heterodyne method and torsional pendulum method to measure micro impulse and measuring method thereof

A linear frequency modulation, laser heterodyne technology, applied in measuring devices, force/torque/work measuring instruments, instruments, etc., can solve problems such as low measurement accuracy

Inactive Publication Date: 2014-07-30
HEILONGJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem of low measurement accuracy of existing devices and methods for measuring micro-impulse. The present invention provides a device for measuring micro-impulse using chirped double-beam laser heterodyne method and torsion pendulum method and a measurement method for the device.

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  • Device for adopting linear frequency modulation double beam laser heterodyne method and torsional pendulum method to measure micro impulse and measuring method thereof
  • Device for adopting linear frequency modulation double beam laser heterodyne method and torsional pendulum method to measure micro impulse and measuring method thereof
  • Device for adopting linear frequency modulation double beam laser heterodyne method and torsional pendulum method to measure micro impulse and measuring method thereof

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specific Embodiment approach 1

[0055] Specific implementation mode one: see figure 1 Describe this embodiment, the device for measuring micro-impulse using chirped double-beam laser heterodyne method and torsion method described in this embodiment, it includes pulse laser 1, working medium target 2, standard beam 3, and No. 2 plane mirror 4 , chirp laser 5, No. 1 plane mirror 6, plane standard mirror 7, converging lens 8, photodetector 9, signal processing system 10 and vacuum chamber 11;

[0056] The pulse laser 1, working medium target 2, standard beam 3, No. 2 plane mirror 4, chirp laser 5, No. 1 plane mirror 6, plane standard mirror 7 and converging lens 8 are all placed in a vacuum chamber,

[0057] A working fluid target 2 is fixed on the plane at one end of the beam of the standard beam 3, and a No. 2 plane reflector 4 is pasted on the opposite position of the other side plane of the standard beam 3 opposite to the working fluid target 2; 3 In the horizontal state, the optical axis of the laser ligh...

specific Embodiment approach 2

[0061] Embodiment 2: The difference between this embodiment and the device for measuring micro-impulse using chirped double-beam laser heterodyne method and torsion method described in Embodiment 1 is that the signal processing system 10 includes a filter 10-1 , preamplifier 10-2, A / D converter 10-3 and DSP10-4, the signal output end of described filter 10-1 is connected with the amplified signal input end of preamplifier 10-2, preamplifier The amplified signal output terminal of 10-2 is connected with the analog signal input terminal of A / D converter 10-3, and the digital signal output terminal of A / D converter 10-3 is connected with the data signal input terminal of DSP10-4.

specific Embodiment approach 3

[0062] Embodiment 3: This embodiment is based on the device for measuring micro-impulse by chirped double-beam laser heterodyne method and torsion method described in Embodiment 1 or 2 to realize the measurement method of micro-impulse. The specific process of this method is,

[0063] Firstly, make the pulsed laser 1, the chirp laser 5, the photodetector 9 and the signal processing system 10 in the working state, measure and obtain the swing angle θ′ of the standard beam 3,

[0064] Second, according to

[0065] I ′ = 2 Jω D · θ ′ 4 πJ DT ′ · θ ′ (Formula 1),

[0066] Calculate and obtain the micro-pulse I' generated by the action of the laser emitted by the pulsed laser 1 and t...

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Abstract

The invention relates to a device for adopting a linear frequency modulation double beam laser heterodyne method and a torsional pendulum method to measure micro impulse and a measuring method thereof and belongs to the field of micro impulse measurement. The problem that existing devices and methods for micro impulse measurement are low in measurement precision is solved. The linear frequency modulation double beam laser heterodyne method is applied to the micro impulse measurement method, measurement of the micro impulse is converted into measurement of a standard beam torsional pendulum angle, information of the to-be-measured standard beam torsional pendulum angle can be obtained indirectly through the measurement of the thickness of a plane standard lens, measurement accuracy is effectively improved, the measured micro impulse and the incidence angle theta 0 form linear relations when the turning angle is small (smaller than 5 degrees), the measuring error is smaller than 0.52%, the requirements of impulse measurement of a laser micro thruster can be met, and a good measurement means is provided for evaluating the performance of the laser micro thruster. The device and the measuring method are mainly applied to evaluation of the laser micro thruster.

Description

technical field [0001] The invention belongs to the field of micro-pulse 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, 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 杨九如李彦超冉玲苓高扬柳春郁杨瑞海杜军丁群王春晖马立峰于伟波
Owner HEILONGJIANG UNIV
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