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Device and method for measuring micro-impulse based on linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and torsional pendulum method

A linear frequency modulation and laser heterodyne technology, applied in the optical field, can solve the problems of small impulse accidental errors and low measurement accuracy, and achieve the effects of reducing measurement errors, high resolution, and strong anti-interference ability.

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

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of large occasional errors and low measurement accuracy in the measurement of micro-pulses by existing laser interferometry, and to provide a method for measuring micro-pulses based on linear frequency modulation multi-beam laser heterodyne second harmonic method and torsion pendulum method Device and method

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  • Device and method for measuring micro-impulse based on linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and torsional pendulum method
  • Device and method for measuring micro-impulse based on linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and torsional pendulum method
  • Device and method for measuring micro-impulse based on linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and torsional pendulum method

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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the device for measuring micro-impulse based on chirped multi-beam laser heterodyne second harmonic method and torsion method described in this embodiment, it includes chirp laser 1, first plane mirror 2, torsion system, pulse Laser 6, plane standard mirror 7, converging lens 8, photodetector 9 and signal processing system;

[0024] Described chirp laser 1, the first plane reflector 2, torsion system, pulse laser 6, plane standard mirror 7 and converging lens 8 are positioned in vacuum chamber 14, and vacuum chamber 14 is provided with a vacuum window 15; Described torsion system is made of standard Composed of beam 3, second plane mirror 4 and working medium target 5; a second plane mirror 4 is pasted on the lower surface of one end of the standard beam 3, and the upper surface of the standard beam 3 corresponds to the second plane mirror 4 The working medium target 5 is fix...

specific Embodiment approach 2

[0030] Specific implementation mode two: the following combination figure 2 Describe this embodiment mode, this embodiment mode is further described to embodiment mode one, and signal processing system comprises filter 10, preamplifier 11, A / D conversion circuit 12 and DSP microprocessor 13;

[0031] The input end of filter 10 is connected with the electric signal output end of photodetector 9; The output end of filter 10 is connected with the input end of preamplifier 11; The signal input terminal is connected; the digital signal output terminal of the A / D conversion circuit 12 is connected with the input terminal of the DSP microprocessor 13 .

specific Embodiment approach 3

[0032] Specific implementation mode three: the following combination figure 2Describe this embodiment, based on the method of the device for measuring micro-impulse based on the chirped multi-beam laser heterodyne second harmonic method and the torsion method described in the second embodiment, the method includes the following steps:

[0033] Step 1, turn on chirp laser 1 and pulse laser 6 at the same time;

[0034] The pulsed laser 6 is used to emit pulsed laser light to excite the working medium target 5, so that the working medium target 5 generates plasma jetting, and the reverse spray effect of the generated plasma jetting makes the standard beam 3 rotate;

[0035] Step 2: The signal processing system continuously collects the electrical signals sent by the photodetector 9 during the swinging process of the torsion system, and processes the continuously obtained electrical signals, and measures the beam incidence by using the chirp multi-beam laser heterodyne second har...

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Abstract

The invention provides a device and method for measuring the micro-impulse based on a linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and a torsional pendulum method, and belongs to the field of optics. The device and the method aim at solving the problems that when the micro-impulse is measured through an existing laser interference method, accidental errors are large and measurement accuracy is low. The device comprises a linear frequency modulation laser device, a first plane mirror, a torsional pendulum system, a pulse laser device, a plane standard mirror, a converging lens, a photoelectric detector and a signal processing system. Laser beams emitted by the pulse laser device and a working medium target act to generate plasma jetting, and a standard beam is made to rotate under the reverse jetting action. Linearly-polarized light passes through the surface of a second plane mirror pasted on the standard beam, the light, transmitted by the front surface of the plane standard mirror, of reflected light is reflected by the rear surface of the plane standard mirror and then converged to the light sensitive face of the photoelectric detector through the converging lens together with the light, reflected by the front surface of the plane standard mirror, of the reflected light, the tilt angle of the standard beam is obtained through the signal processing system, and therefore the micro-impulse generated when lasers and the working medium target act is measured.

Description

technical field [0001] The invention relates to a device and a method for measuring micro-impulse based on a linear frequency modulation multi-beam laser heterodyne second harmonic method and a torsion method, belonging to the field of optics. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 李彦超杨九如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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