Direct pulling type acceleration transducer based on fiber Bragg grating

Abstract

The invention discloses a direct pulling type acceleration transducer based on a fiber Bragg grating (GBG), which comprises a case, a metal wire, a mass block and an FBG transducer basic element, wherein the FBG is used as an optical transducer element, and is also used as a structural element, the lower end of the transducer basic element is connected with the upper end of the mass block, the upper end of the transducer basic element is fixed onto the case, the transducer basic element is sagged to the horizontal plane, in addition, the mass block is symmetrically supported on the case by the metal wire, and the fixed horizontal position of the mass block is maintained. Because the invention adopts a direct tensioning and pulling type FBG acceleration transducer for sensing the acceleration, and the FBG basic element is used for directly sensing the axial deformation features, the FBG is used as an elastic body to be directly tensioned and pulled. Because of the special structural design of the transducer and the adoption of the fiber sensing elements, the invention reaches high resolution at the same time of maintaining higher natural frequency and wider use frequency range.

Description

Technical field [0001] The invention relates to an acceleration sensor, in particular to a straight-pull acceleration sensor based on fiber grating FBG. Background technique [0002] Acceleration sensors have a wide range of applications in industries such as automobiles, aerospace, civil engineering, etc. The number and variety of acceleration sensors are too numerous to count. Especially with the development of technology in the past ten years, new processes and new technologies in sensor manufacturing have created various types of acceleration sensors. At present, the common acceleration sensors on the market mainly include the following types: resistive acceleration sensors, piezoelectric acceleration sensors, capacitive acceleration sensors, and phase modulation optical fiber acceleration sensors. [0003] However, the existing electrical acceleration sensor has its specific limitations in application. For example, resistive acceleration sensors are relatively large in size ...

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Problems solved by technology

[0003] However, the existing electrical acceleration sensor has its specific limitations in application

For example, the resistive acceleration sensor is relatively large in size and is only suitable for low-frequency and small vibration measurements; the piezoelectric acceleration sensor has no steady-state response and the resistance output impedance is too high, and a low-noise cable with a low-value capacitor is required to cooperate with it. Heavy wiring work and sensitivity to electromagnetic fields have become obstacles to installation on buildings; optical acceleration sensors have inherent advantages over ordinary electrical sensors, such as being free from electromagnetic field interference and being able to transmit signals over long distances without signal amplification. Greatly reduce the wiring work, but the existing fiber optic acceleration sensor is based on the phase modulation of the Mach-Zehnder interferometer, which is very susceptible to interference, not only has high requirements for the measurement environment, but also has high costs

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