Method for measuring micro-impulse based on chirp multi-beam laser heterodyne second harmonic method and torsion pendulum method
A linear frequency modulation and laser heterodyne technology, which is applied in the optical field, can solve the problems of low measurement accuracy and large accidental errors of small impulses, and achieve the effects of high resolution, reduced measurement errors, and reduced requirements.
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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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