Method for measuring Young modulus through Doppler vibrating mirror sinusoidal modulation of multi-beam laser heterodyne second harmonic

A Doppler galvanometer and laser heterodyne technology, which is used in measuring devices, using optical devices, and applying stable tension/pressure to test the strength of materials, etc. question

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

[0004] In order to solve the problem that the collected laser difference frequency signal and the operation speed of signal processing are not ideal in the existing laser heterodyne measurement method when measuring Young's modulus, the proposed Doppler vibrating mirror sinusoidally modulates the multi-beam laser Method of Measuring Young's Modulus by Heterodyne Second Harmonic

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  • Method for measuring Young modulus through Doppler vibrating mirror sinusoidal modulation of multi-beam laser heterodyne second harmonic
  • Method for measuring Young modulus through Doppler vibrating mirror sinusoidal modulation of multi-beam laser heterodyne second harmonic
  • Method for measuring Young modulus through Doppler vibrating mirror sinusoidal modulation of multi-beam laser heterodyne second harmonic

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specific Embodiment approach 1

[0063] Specific implementation mode one: combine figure 1 Describe this embodiment, the method for measuring the Young's modulus of the second harmonic of the Doppler galvanometer sinusoidally modulated multi-beam laser heterodyne described in this embodiment, it is based on the Doppler galvanometer sinusoidally modulated multi-beam laser heterodyne two It is realized by a device for measuring Young's modulus with a subharmonic, and the device includes a device for measuring distance by multi-beam laser heterodyne, which consists of a H0 solid-state laser 1, a plane mirror 6, a quarter-wave plate 3, and a vibrating mirror 2 , galvanometer drive power supply, polarizing beam splitter 4, converging lens 9, thin glass plate 5, photodetector 10 and signal processing system, the galvanometer drive power supply is used to drive the galvanometer 2 to vibrate; the thin glass plate 5 is horizontally fixed, A plane reflector 6 is arranged at a distance d directly above the thin glass pl...

specific Embodiment approach 2

[0120] Embodiment 2: This embodiment differs from Embodiment 1 in that xMg is within the elastic limit of the metal wire to be tested. Other compositions and connection methods are the same as those in Embodiment 1.

specific Embodiment approach 3

[0121] Embodiment 3: This embodiment differs from Embodiment 1 in that the metal wire 8 to be tested is a steel wire. Other compositions and connection methods are the same as those in Embodiment 1.

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Abstract

The invention provides a method for measuring Young modulus through Doppler vibrating mirror sinusoidal modulation of multi-beam laser heterodyne second harmonic and relates to a method for measuring Young modulus. The method is provided for solving the problem that when the existing laser heterodyne measurement method is adopted to measure the Young modulus, the collected laser difference frequency signals and the operation speed of signal processing are not ideal. In the method, a metal wire to be tested is hung on a fixed support to ensure that the metal wire is perpendicular to the reflecting surface of a plane mirror, a laser is opened while the vibrating mirror begins performing simple harmonic vibration; a signal processing system collects the signal output by a photoelectric detector to obtain the distance parameter of a thin glass plate and the plane mirror, the weight of weights is increased, the distance parameter of the thin glass plate and the plane mirror is obtained again, the extension length is obtained according to the obtained two distance parameters; and the Young modulus of the metal wire is obtained. The method has outstanding advantages that the collected laser difference frequency signals have high quality and the operation speed of signal processing is high.

Description

technical field [0001] The invention relates to a method for measuring Young's modulus. Background technique [0002] Young's modulus of elasticity reflects the relationship between material deformation and internal stress. When a material is subjected to external force, it must be deformed. The ratio of its internal stress and strain (ie relative deformation) is called Young's modulus of elasticity. An important physical quantity of material properties is an important parameter in the selection of mechanical components in engineering technology. In recent years, in engineering measurement technology, optical rod method, optical fiber sensor method, CCD method, interference method, stretching method and diffraction method are mostly used, but these methods have more indirect measurements, larger accidental errors, and require A large amount of data processing is carried out. Therefore, the measurement accuracy of these methods is low and cannot meet the current high-precisi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/14G01B11/16
Inventor 王春晖李彦超
Owner HARBIN INST OF TECH
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