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Doppler vibrating mirror sine modulation multi-beam laser heterodyne second harmonic measurement device and method for measuring magnetostriction coefficient

A technology of magnetostriction coefficient and Doppler vibrating mirror, which is applied in the field of micro-displacement detection, can solve the problems of low quality of laser difference frequency signal collection and slow signal processing operation speed, etc., and achieve strong anti-interference ability, fast measurement speed, The effect of a large measuring range

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

[0007] In order to solve the problems of the existing laser heterodyne measurement technology in the measurement of the magnetostriction 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 Device and method for measuring magnetostriction coefficient with laser heterodyne second harmonic

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  • Doppler vibrating mirror sine modulation multi-beam laser heterodyne second harmonic measurement device and method for measuring magnetostriction coefficient
  • Doppler vibrating mirror sine modulation multi-beam laser heterodyne second harmonic measurement device and method for measuring magnetostriction coefficient
  • Doppler vibrating mirror sine modulation multi-beam laser heterodyne second harmonic measurement device and method for measuring magnetostriction coefficient

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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 the magnetostriction coefficient by the Doppler vibrating mirror sinusoidally modulating the multi-beam laser heterodyne second harmonic in this embodiment, the device consists of the first fixed rod 1-1, the second fixed rod 1 -2. Exciting coil 2. Iron-nickel alloy sample to be tested 3. DC regulated power supply 4. Plane mirror 5. Thin glass plate regardless of thickness 6. Polarizing beam splitter PBS7. H0 solid-state laser 8. Quarter wave plate 9. Consisting of vibrating mirror 10, converging lens 11, photodetector 12 and signal processing system 13,

[0024] The DC stabilized power supply 4 is used to provide working power for the excitation coil 2, the iron-nickel alloy sample 3 to be tested is placed in the center of the excitation coil 2, and one end of the iron-nickel alloy sample 3 to be tested is fixedly connected to one end of the first fix...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment is a further description of Embodiment 1, and the distance d is 20 mm.

specific Embodiment approach 3

[0031] Specific Embodiment 3: This embodiment is a further description of Embodiment 1 or 2. Both end surfaces of the first fixing rod 1-1 and the second fixing rod 1-2 are bonded with non-magnetic materials.

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Abstract

The invention relates to a Doppler vibrating mirror sine modulation multi-beam laser heterodyne second harmonic measurement device for measuring magnetostriction coefficient and a method thereof. The invention is brought forward to solve the problems of poor quality of acquired laser different frequency signals and slow operation speed of signal processing in present laser heterodyne measurement technologies for measuring the magnetostriction coefficient. The Doppler vibrating mirror sine modulation multi-beam laser heterodyne second harmonic measurement method for measuring the magnetostriction coefficient comprises the following steps of: demagnetizing a sample to be measured, arranging the positions of a planar mirror and a thin sheet of glass, turning on an H0 solid state laser, continuously acquiring measured second harmonic signals and processing electrical signals sent from a photodetector by a signal processing system to obtain the variable quantity of the distance between theplanar mirror and the thickness-ignoring thin glass plate and obtain the magnetostriction coefficient of the sample to be measured. The measurement method provided by the invention has advantages of high quality of the acquired laser different frequency signals and high operation speed of signal processing, and can be widely applied in ultra-precision measurements, detection, processing equipmentand laser radar systems.

Description

technical field [0001] The invention relates to a device and method for measuring magnetostriction coefficient by sinusoidally modulating multi-beam laser heterodyne second harmonics with a Doppler vibrating mirror, and belongs to the technical field of micro-displacement detection. Background technique [0002] The magnetic domains of ferromagnets will be aligned under the action of an external magnetic field, thereby causing changes in the lattice spacing in the medium, resulting in changes in the length of ferromagnets, which is called the magnetostrictive effect. Since this phenomenon was first discovered by Joule in 1842, it is also called the Joule effect. Magnetostriction not only has an important influence on the magnetism of materials, especially on initial permeability, coercive force, etc., but also the application of the magnetostrictive effect itself in practice is very extensive, such as magnetostrictive technology can It is used in mechanical vibration and ul...

Claims

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Application Information

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IPC IPC(8): G01N21/45
Inventor 王春晖李彦超
Owner HARBIN INST OF TECH
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