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Digital laser image vibration measurer

A vibrometer, digital technology, applied in the direction of instruments, measuring devices, measuring acceleration, etc., can solve the problems of difficult to use laser non-contact measurement method, limited range of laser non-contact vibration measurement, etc., achieve light weight, simple structure, low cost cost effect

Inactive Publication Date: 2007-07-18
BEIHANG UNIV
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Problems solved by technology

For portable non-contact vibrometers, from a technical point of view, considering physical factors such as hardware volume, cost, and weight, the essential link is the non-contact transmission of vibration signals. Optical effects are common non-contact measurement methods. However, due to the complexity of optical interference signals and the limitations of modern optical and electronic devices, the range of general laser non-contact vibration measurement is very limited. The vibration frequency they detect is below several hundred Hz, and the amplitude range is on the order of microns. , conventional vibration signal detection is always difficult to use laser non-contact measurement method, this field has been dominated by various contact measurement methods

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] A digital laser image vibrometer of the present invention first divides the incident light into reference light and measurement light according to the principle of Michelson laser interference, the measurement light is reflected from the vibration surface and interferes with the reference light, and passes through the aperture 2 to remove the dryness. The interference image is obtained on the camera, the camera converts the interference light intensity image into an electrical signal, and outputs it to the CPU, and the CPU obtains the digital signal of the laser interference image through the camera driver, and stores it in the memory. After collecting for a period of time, a series of interference image information is obtained, and the CPU transforms, reconstructs, re-samples, and differentiates the collected information to obtain the frequency and amplitude of ...

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Abstract

A vibrometer comprises CPU, laser emitter, camera shooting head, display, keyboard and system power. It is featured as emitting laser signal to generate interference of issued laser beam with measured vibration face through light path formed by Michelson interferometer principle, converting interference signal to be electrical signal and sending it to CPU, carrying out algorithm of signal reconstructed, antiinterference, filter and signal conversion for obtaining detection result, and using Motorola longzhu MXL as signal processing kernel for CPU.

Description

technical field [0001] The invention relates to a measuring instrument for measuring vibration, more particularly a non-contact laser vibrometer with a high-frequency (0.01HZ-10KHZ) and large-amplitude (0.001-20mm) vibration parameter measurement range. This instrument adopts the anti-jamming algorithm, signal reconstruction algorithm, filtering algorithm, and signal transformation algorithm to obtain the detection results of the received image information, which changes the situation that the general non-contact laser vibration measurement can only be used for low-frequency and small-signal vibration measurement. It can be used to replace common contact-type rotating machinery fault diagnosis instruments, and its measurement range can fully meet the needs of use. Background technique [0002] As the most commonly used tool for vibration testing and analysis, vibrometers are widely used in industrial fields. It is of great practical significance to develop and develop non-co...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00G01P15/00
Inventor 郑红姚俊孙晓涛李子鹏
Owner BEIHANG UNIV