Method for measuring electrostriction coefficient of sinusoidal modulation multi-beam laser heterodyne second harmonic waves by utilizing Doppler vibration mirror

A technology of Doppler galvanometer and sinusoidal modulation, which is applied to the measurement of phase influence characteristics, etc., can solve the problems of slow signal processing speed and low quality of laser difference frequency signal acquisition

Inactive Publication Date: 2011-11-23
HARBIN INST OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the existing laser heterodyne measurement technology is used to measure the electrostriction coefficient, the quality of the collected laser difference frequency signal is low, and the calculation speed of the signal processing is slow, and the proposed Doppler vibrating mirror sinusoidal modulation multi-beam Method of Measuring Electrostrictive Coefficient by Laser Heterodyne Second Harmonic

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  • Method for measuring electrostriction coefficient of sinusoidal modulation multi-beam laser heterodyne second harmonic waves by utilizing Doppler vibration mirror
  • Method for measuring electrostriction coefficient of sinusoidal modulation multi-beam laser heterodyne second harmonic waves by utilizing Doppler vibration mirror
  • Method for measuring electrostriction coefficient of sinusoidal modulation multi-beam laser heterodyne second harmonic waves by utilizing Doppler vibration mirror

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specific Embodiment approach 1

[0062] Specific implementation mode 1: Combination Figure 1 to Figure 5 To explain this embodiment, the method for measuring the electrostriction coefficient of the Doppler galvanometer sinusoidally modulated multi-beam laser heterodyne second harmonic is based on the Doppler galvanometer sinusoidally modulated multi-beam laser heterodyne second harmonic method. The sub-harmonic measurement of the electrostriction coefficient is realized by the H0 solid-state laser 2, quarter wave plate 12, galvanometer 13, first plane mirror 3, polarization beam splitter PBS11, converging lens 10, thin It is composed of a glass plate 9, a second plane mirror 6, a piezoelectric ceramic tube to be tested 7, a two-dimensional adjustment frame 8, a high-voltage power supply, a photodetector 4, and a signal processing system 5;

[0063] The linearly polarized light emitted by the H0 solid-state laser 2 is reflected by the first plane mirror 3 and then enters the polarization beam splitter PBS11. The...

specific Embodiment approach 2

[0115] The second embodiment: This embodiment is different from the first embodiment in that the piezoelectric ceramic tube 7 to be tested is made of a PZT piezoelectric ceramic body. Other components and connection modes are the same as the first embodiment.

specific Embodiment approach 3

[0116] Specific embodiment three: this embodiment is different from specific embodiment one in that in the system for measuring the electrostriction coefficient by the multi-beam laser heterodyne second harmonic method, the signal processing system 5 consists of a filter circuit 5-1 and a preamplifier circuit 5-2. The analog-to-digital conversion circuit A / D and the digital signal processor DSP are composed. The filter circuit 5-1 filters the received electrical signal output by the photodetector 4 and sends it to the preamplifier circuit 5-2. , The signal amplified by the pre-amplification circuit 5-2 is output to the analog-digital conversion circuit A / D, and the analog-digital conversion circuit A / D sends the converted signal to the digital signal processor DSP. Other components and connection modes are the same as the first embodiment.

[0117] based on figure 1 The shown multi-beam laser heterodyne second harmonic measurement system uses MATLAB software to simulate and measu...

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Abstract

The invention relates to a method for measuring the electrostriction coefficient of sinusoidal modulation multi-beam laser heterodyne second harmonic waves by utilizing a Doppler vibration mirror and particularly relates to a method for measuring electrostriction coefficient. The method is provided for solving the problems of low acquisition laser difference frequency signal quality and low signal processing computing speed of the existing laser heterodyne measuring technique in the measurement process of the electrostriction coefficient. In the method provided by the invention, the reflection surface of a second plane reflector is parallel to a thin glass plate; a vibration mirror starts simple harmonic vibration; an H0 solid laser is simultaneously turned on to adjust output voltage signals of a high-voltage power supply; simultaneously, a signal processing system continuously collects and processes electric signals which are output by a photoelectric detector to obtain the distance variable quantity between the second plane reflector and the rear surface of the thin glass plate, thereby obtaining the electrostriction coefficient of a piezoelectric ceramic pipe to be measured; and the method has the advantages that the quality of collected laser difference frequency signals is high and computation speed of signal processing computing is high. The method can be widely used in the fields of relative laser wind measuring radars and the like.

Description

Technical field [0001] The invention relates to a method for measuring the electrostriction coefficient. Background technique [0002] Among all the electromechanical systems and devices involved in automatic control, the actuator is often considered to be one of the most critical factors limiting its performance and life. Among the many types of actuators, piezoelectric / electrostrictive actuators are due to their fast response and bearing capacity. High power, low energy consumption and low price have attracted much attention. At present, piezoelectric / electrostrictive actuators have been successfully applied in many technical fields such as laser cavity, precision positioning, precision machining, intelligent structure, bioengineering, aerospace, electronic communication, automotive industry, robot joints, medical equipment, etc. An industry with great potential is being formed. Therefore, the development and application of new piezoelectric / electrostrictive materials, new pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45
Inventor 王春晖李彦超
Owner HARBIN INST OF TECH
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