A laser interference rotor vibration measuring device and its measuring method

A measurement method, a technology of laser interference, applied in measurement devices, measuring ultrasonic/sonic/infrasonic waves, using wave/particle radiation, etc., can solve the problem of inability to measure the bending vibration of the rotor, and achieve outstanding substantive characteristics, fast response speed, The effect of high measurement accuracy

Inactive Publication Date: 2016-05-04
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0005] At present, the rotor vibration measurement device based on the laser Doppler frequency shift effect can only measure a single vibration. The torsional vibration instrument is more commonly used, which can only measure the torsional vibration of the specified section of the rotor but not the bending vibration of the rotor. This is the current situation. There are deficiencies in the technology

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  • A laser interference rotor vibration measuring device and its measuring method

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Embodiment Construction

[0019] In order to clearly illustrate the technical features of the solution, the solution will be described below through a specific implementation mode combined with the accompanying drawings.

[0020] As can be seen from the accompanying drawings, this program includes a laser installed on a fixed base, a beam splitter A, a beam splitter B, a beam splitter C, a mirror, a lens A, a lens B, a lens A', a lens B', a detection Detector A, detector B and electronic processing unit; the electronic processing unit communicates data with detector A and detector B respectively;

[0021] The laser beam emitted by the laser is divided into two laser beams through the beam splitter C. The transmitted laser beam is the detection laser A, and the reflected laser beam is reflected by the mirror to be the detection laser B; the detection laser A and the detection laser B are parallel to each other;

[0022] The detection laser A passes through the beam splitter A and lens A and focuses on t...

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Abstract

The invention provides a technical scheme of a vibration measurement device for a laser interference rotor and a measurement method thereof. The scheme can simultaneously detect bending vibration and torsional vibration of a high-speed rotor based on beat frequency generated by laser Doppler effect, realizes frequency modulation measurement of a vibration signal under the condition of not using an expensive frequency shift device, and precisely distinguishes the directions of bending vibration and torsional vibration, has very strong anti-environment disturbance capability, and is low in manufacturing cost. The scheme belongs to non-contact measurement, the motion state of the to-be-measured rotor is free from interference, the accuracy in measurement is high, the response speed is fast, the dynamic range is wide, and the measurement can be performed at a further distance. The processing error of the rotor and measurement interference of torsional vibration and bending vibration from other vibration states are small.

Description

technical field [0001] The invention relates to a laser speed measuring device and a measuring method, in particular to a laser interference rotor vibration measuring device and a measuring method. Background technique [0002] In the prior art, it is known that the rotor is the most common functional component in mechanical equipment, and its performance has a decisive influence on the performance of the entire equipment. With the development of mechanical equipment in the direction of high speed, high precision and high reliability, the precise measurement of the actual motion state of the rotor is very important, whether it is for the research on the performance of the rotor in new equipment or the monitoring of the actual operating state of the equipment. [0003] The measurement methods of rotor vibration can be generally divided into contact measurement and non-contact measurement. In contact measurement, measurement sensors (such as strain gauges, etc.) Capacitance,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 赵登峰宋丹路曾国英黄娟熊平
Owner SOUTHWEAT UNIV OF SCI & TECH
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