Vibration measurement apparatus based on laser speckle of polarized singular-point light beam

Abstract

The invention relates to a vibration measurement apparatus based on a laser speckle of a polarized singular-point light beam. With the apparatus, a problem that non-destructive telemetering of vibration information can not be realized in the prior art can be solved. On the basis of the principle of laser speckle excitation by the polarized singular-point light beam and combination with a vector-light field coherent technology, a vector light field coherent technology passes through a light splitter and then irradiates a detected zone; a singular-point light beam laser scattering effect is generated by the detected zone; and a laser speckle passes through an out-of focus optical imaging system to carry out transmission. Another polarized singular-point light beam after light splitting passes through two wave plates; horizontal polarized distribution control is carried out and then reflection is carried out by a reflection element; an overlapped area with a laser speckle light filed exists to form an interference light field; and a photoelectric sensor detects the interference light field information and vibration information is obtained based on information processing. According to the invention, the vibration measurement apparatus has characteristics of non-contact detection, non-destructive detection, remote measurement realization, adjustable performance, high sensitivity and reliability, good anti-interference capability, wide frequency response characteristic, high information quantity, easy system construction, convenient usage, and wide application range and the like.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a vibration detection method, in particular to a vibration measurement device based on a polarized singularity beam laser speckle, which is mainly used in noise analysis, vibration monitoring, voice collection, engineering testing, risk assessment, environmental Vibration information measurement in perception, quality inspection, environmental monitoring, resource exploration, biological life, medical treatment, smart health, process control, national defense security, Internet of Things, process control, advanced manufacturing, etc. Background technique [0002] Vibration is a very common and important physical phenomenon that exists widely in our environment. In a broad sense, vibration also includes the fields of acoustics and audio. Vibration measurement has a wide range of applications in many fields. For example, in the field of engineering testing, the vibration of engineer...

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Problems solved by technology

[0003] There is a vibration information detection method in the prior art, a piezoelectric vibration sensor, (see US patent, patent name: Piezoelectric vibration sensor, inventor: Orten Birger, patent number: US7656524B2, patent authorization time: May 06, 2008 ), although there are certain characteristics, but there are still essential deficiencies: 1) Use the piezoelectric principle for vibration detection, and make a vibration sensor based on piezoelectric materials, and then the vibration sensor is in contact with the detected object to sense the vibration information, so in essence it needs The piezoelectric sensor and the detected vibration object are in close contact, and long-distance vibration telemetry cannot be realized; 2) The piezoelectric vibration sensor and the detected object are used in close proximity, and the dete

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