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Method for measuring electrostrictive coefficient by using multi-beam laser heterodyne quadratic harmonic method

A laser heterodyne and second harmonic technology, applied in the measurement of electricity, measurement of electrical variables, measurement devices, etc., can solve the problems of poor laser difference frequency signal collection effect, slow signal processing operation speed, and low measurement accuracy.

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

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a multi-beam laser in order to solve the problem of low measurement accuracy caused by poor acquisition effect of laser difference frequency signal and slow operation speed of signal processing in the existing method of measuring electrostriction coefficient by multi-beam laser heterodyne. Method of Measuring Electrostrictive Coefficient by Heterodyne Second Harmonic Method

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  • Method for measuring electrostrictive coefficient by using multi-beam laser heterodyne quadratic harmonic method
  • Method for measuring electrostrictive coefficient by using multi-beam laser heterodyne quadratic harmonic method
  • Method for measuring electrostrictive coefficient by using multi-beam laser heterodyne quadratic harmonic method

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specific Embodiment approach 1

[0058] Specific implementation mode one, combination figure 1 In this specific embodiment, the method for measuring the electrostriction coefficient by the multi-beam laser heterodyne second-harmonic method is implemented based on the system for measuring the electrostriction coefficient by the multi-beam laser heterodyne second-harmonic method. By H 0 Solid-state laser 2, quarter wave plate 12, galvanometer 13, first plane mirror 3, polarizing beam splitter PBS11, converging lens 10, thin glass plate 9, second plane mirror 6, piezoelectric ceramic to be tested Tube 7, two-dimensional adjustment frame 8, high-voltage power supply, photoelectric detector 4 and signal processing system 5;

[0059] H 0 The linearly polarized light emitted by the solid-state laser 2 is reflected by the first plane mirror 3 and then enters the polarization beam splitter PBS11. The light beam reflected by the polarization beam splitter PBS11 is transmitted by the quarter wave plate 12 and then enters th...

specific Embodiment approach 2

[0111] The second embodiment is different from the method for measuring the electrostriction coefficient by the multi-beam laser heterodyne second harmonic method described in the first embodiment in that the piezoelectric ceramic tube 7 to be tested uses PZT piezoelectric ceramic Body production.

[0112] The piezoelectric body to be tested first uses a circular tube-shaped piezoelectric ceramic, its shape and structure are as figure 1 Shown. It is made of lead zirconate titanate (PZT). The inner and outer surfaces of the tube are plated with silver. As an electrode, the lead wire can be connected to apply an external voltage to it. Experiments show that when a voltage is applied to its outer surface When the surface is grounded), the tube is stretched, on the contrary, when a negative voltage is applied, the tube is shortened.

[0113] Let E represent the electric field strength of the radial electric field formed between the inner and outer surfaces of the tube after applying a...

specific Embodiment approach 3

[0120] Embodiment 3 The difference between this embodiment and the method for measuring electrostriction coefficient by the multi-beam laser heterodyne second harmonic method described in the first embodiment is that the multi-beam laser heterodyne second harmonic method measures electricity In the system of stretching coefficient, the signal processing system 5 is composed of a filter circuit 5-1, a preamplifier circuit 5-2, an analog-to-digital conversion circuit A / D and a digital signal processor DSP. The electric signal output by the photodetector 4 is filtered and sent to the preamplifier circuit 5-2. The signal amplified by the preamplifier circuit 5-2 is output to the analog-digital conversion circuit A / D. The digital conversion circuit A / D sends the converted signal to the digital signal processor DSP.

[0121] The following specific simulation experiments verify the effects of the present invention: figure 1 The shown multi-beam laser heterodyne second harmonic measureme...

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Abstract

The invention discloses a method for measuring an electrostrictive coefficient by using a multi-beam laser heterodyne quadratic harmonic method, relates to a method for measuring the electrostrictive coefficient and solves the problem of lower measuring precision caused by poor acquisition effect of a laser difference frequency signal and low operation speed of signal processing in a traditional method for measuring the electrostrictive coefficient by using multi-beam laser heterodyne. A galvanometer scanner is introduced in a light path, so that an optical frequency is additionally arranged on optical signals which are incident at different moments, reflecting light passing through the front surface of a thin glass plate and light which is reflected by a plane reflecting mirror for multiple times to transmit through the thin glass plate generate a multibeam laser heterodyne quadratic harmonic signal under the condition of meeting the interference and further information to be measured is modulated in a frequency difference of an intermediate-frequency quadratic harmonic signal. The method disclosed by the invention can be widely applied to the field of engineering design, such ascoherent laser wind-finding radars and the like.

Description

Technical field [0001] The invention relates to a method for measuring the electrostriction coefficient. Background technique [0002] In all electromechanical systems and devices involved in automatic control, the driver is often considered to be one of the most critical factors limiting its performance and life. Among the many types of drivers, piezoelectric / electrostrictive drivers are due to their fast response, The characteristics of high carrying capacity, 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 p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01B11/16
Inventor 李彦超王春晖高龙曲杨张峰
Owner HARBIN INST OF TECH
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