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Low-frequency accelerometer based on fiber grating

A technology of acceleration sensor and optical fiber grating, which is applied in the direction of measurement of acceleration, velocity/acceleration/shock measurement, acceleration measurement using inertial force, etc. It can solve the problems of application limitation, difficulty in measurement, difficulty in overcoming the influence of electromagnetic field interference, etc., and achieve strong Anti-electromagnetic interference ability, high sensitivity effect

Inactive Publication Date: 2016-06-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The monitoring of these low-frequency vibrations often uses electrical sensors to pick up signals, but in a strong electromagnetic field environment, it is difficult for electrical vibration sensors to overcome the interference of electromagnetic fields. Its application is also limited, and the acceleration amplitude of low-frequency vibration is small, and it is difficult to measure, so a high-sensitivity non-electrical acceleration sensor is required

Method used

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  • Low-frequency accelerometer based on fiber grating
  • Low-frequency accelerometer based on fiber grating
  • Low-frequency accelerometer based on fiber grating

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing.

[0020] Such as Figure 1-5 As shown, this embodiment provides a low-frequency acceleration sensor based on fiber gratings, including a base 1, on which at least one set of elastic mass components is provided, and the elastic mass components include a mass block 2 of a cuboid structure and a curved elastic piece 5 , the curved shrapnel is L-shaped, and its bend is a circular arc transition. There are a plurality of through holes on the curved shrapnel. The mass block 2 is installed under the curved shrapnel 5, and multiple One threaded hole, one end of 5 of the curved shrapnel is connected with the base 1, the other end is pressed onto the base with a screw 3, and a fiber grating 6 is installed above the bent shrapnel, and the fiber grating 6 passes through the ring Oxygen resin 4 is bonded to the curved elastic pieces 5, and when the elastic mass components are more than t...

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PUM

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Abstract

The invention discloses a low-frequency accelerometer based on a fiber grating. The accelerometer comprises a pedestal, two symmetrical elastic mass assemblies are arranged on the pedestal, each elastic mass assembly comprises a mass block and a bending spring, the mass block is placed under the bending spring, one end of the bending spring is connected with the pedestal, the other end of the bending spring is pressed on the pedestal by the mass block, and the fiber grating is placed on the bending springs and adhered to the bending springs. The bending springs vibrate to enable axial strains in opposite directions at the two ends of the fiber grating, an axial strain sensing mechanism of the fiber grating is utilized to measure the acceleration, and the measuring sensitivity is multiplied. A fiber is used to transmit sensing signals, measurement and transmission are integrated, and the low-frequency accelerometer based on the fiber grating further has the advantages including high sensitivity, high performance in anti-electromagnetic interference, and capability of long-distance monitoring.

Description

technical field [0001] The invention belongs to the technical field of acceleration sensors, in particular to a low-frequency acceleration sensor based on a fiber grating. Background technique [0002] Low-frequency vibration widely exists in production practice, and its vibration frequency is generally below 100Hz. For example, the vibration frequency of large hydroelectric generating units is below 15Hz; the natural frequency of general road and railway bridge vibration is about 2-10Hz; the engineering earthquake pulsation frequency is generally between 2-50Hz. The monitoring of these low-frequency vibrations often uses electrical sensors to pick up signals, but in a strong electromagnetic field environment, it is difficult for electrical vibration sensors to overcome the interference of electromagnetic fields. Its application is also limited, and the acceleration amplitude of low-frequency vibration is small, and the measurement is difficult. Therefore, a non-electrical ...

Claims

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Application Information

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IPC IPC(8): G01P15/03
CPCG01P15/032
Inventor 戴玉堂胡鹏飞殷广林
Owner WUHAN UNIV OF TECH
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