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Apparatus for measuring libration by optical fibre and measuring method

A vibration device and optical fiber measurement technology, which is applied in the direction of measuring devices, ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of interferometric optical fiber sensing system drift and susceptibility to external environment changes, etc.

Inactive Publication Date: 2007-05-16
CHINA NAT ACAD NANOTECH & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-sensitivity fiber-optic vibration sensors mostly use fiber-optic interference technology, and interferometric fiber-optic sensing systems are vulnerable to changes in the external environment. For example, changes in temperature often lead to drift of interferometric fiber-optic sensing systems

Method used

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  • Apparatus for measuring libration by optical fibre and measuring method

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Embodiment Construction

[0012] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. As shown in Figure 2, after removing the coating from one end of the common single-mode optical fiber, use a fiber cutter to cut its end face perpendicular to the axis of the optical fiber. A semi-transparent and semi-reflective film (103) that can have a reflectivity of 20-40% for light in the 1550nm wave band is coated on the end face by using optical coating technology. The material and size of the micro-cantilever beam (104) can be selected and designed according to the characteristics of the vibration signal to be measured. In this embodiment, the micro-cantilever 104 is the micro-cantilever on the probe of the scanning probe microscope, the material is silicon nitride, the shape is triangular, the length is 200 microns, and the thickness is 600 nm. Under the microscope, the optical fiber and the micro-cantilever beam are al...

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Abstract

This invention discloses one fiber measurement vibration device and its test method, wherein, the device comprises DFB semiconductor laser, light ring device and its connected single mode fiber sensor, photoelectricity detector orderly connected to signal processor and current and temperature controller, wherein, the current and temperature controller and laser and cooling device are connected; the initial process of system is to determine laser temperature work point through amplifying and filtering photoelectricity output signals alternating volume as vibration signals to be tested.

Description

technical field [0001] The invention relates to an optical fiber measuring vibration device and a measuring method, which belong to the vibration measuring technology. Background technique [0002] Vibration measurement has a wide range of applications in many fields. These areas include detection of sound and ultrasonic signals, seismic monitoring, oil exploration, vibration modal analysis of various mechanical systems, and hydroacoustic systems. At present, the existing vibration sensors can be divided into electromagnetic vibration sensors, variable capacitance vibration sensors and piezoelectric vibration sensors according to their different principles. These vibration sensors are all electrical sensors. Corresponding to the electrical sensor, there is another type of vibration sensor, that is, the optical fiber vibration sensor. Compared with electrical sensors, optical fiber vibration sensors have significant advantages such as anti-electromagnetic interference, cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 李恩邦
Owner CHINA NAT ACAD NANOTECH & ENG
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