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Fiber grating sensor for microearthquakes and manufacturing method of such fiber grating sensor

A technology of microseismic sensor and fiber grating, which is used in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., to achieve the effect of easy installation and simple structure

Inactive Publication Date: 2017-05-31
SHANDONG UNIV
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Problems solved by technology

[0004] In order to solve the above problems, the present invention discloses a fiber grating microseismic sensor and its manufacturing method. The two ends of the fiber grating of the sensor are welded on the vibrating beam to prevent the uneven strain of the vibrating beam from causing the chirp phenomenon of the fiber grating

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  • Fiber grating sensor for microearthquakes and manufacturing method of such fiber grating sensor
  • Fiber grating sensor for microearthquakes and manufacturing method of such fiber grating sensor
  • Fiber grating sensor for microearthquakes and manufacturing method of such fiber grating sensor

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the drawings:

[0038] Such as figure 1 As shown, a new type of fiber grating micro-seismic sensor of the present invention mainly includes fiber grating 1, vibration beam 2, mass 3, housing 4, transmission fiber 5 and signal demodulator 6. The vibration beam 2 is a carbon fiber sheet structure. 2 Screw holes are drilled in the middle and both ends. The center of the mass 3 has a screw hole that can be screwed to the middle of the axial centerline of the vibration beam 2. The shell 1 has a hollow groove structure and screw holes are drilled on both sides. Both ends of the vibrating beam 2 are fixed on the shell 1 with screws, and the mass 3 is fixed directly below the middle of the vibrating beam 2 with screws. The mass 3 cannot be in contact with the bottom surface of the shell 4, and the surface of the axial center line of the vibrating beam 2 is engraved. There are grooves, the two ends of the f...

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Abstract

The invention discloses a fiber grating sensor for microearthquakes and a manufacturing method of such fiber grating sensor. The fiber grating sensor mainly comprises a fiber grating, a vibrating beam, a mass block, a shell, a transmission fiber and a signal demodulator, wherein two ends of the vibrating beam are fixed in the shell, the mass block is fixed in the middle below an axial center line of a vibrating shaft, a set distance is reserved between the mass block and the bottom of the shell, a groove is engraved in the center line of the upper surface of the vibrating beam, the fiber grating is a metal-coated fiber grating, the two ends of the fiber grating are welded in the groove of the vibrating beam, and the transmission fiber is led out of one end of the shell and is used for transmitting a microearthquake signal to the signal demodulator. The fiber grating sensor for the microearthquakes has the advantages of simple structure, convenience in installation, anti-electromagnetic interference and low cost.

Description

Technical field [0001] The invention belongs to the field of geological engineering safety detection and optical fiber sensing, and particularly relates to a fiber grating microseismic sensor and a manufacturing method, which is mainly used for safety monitoring of geological engineering such as mines, tunnels, and bridges. Background technique [0002] With the rapid economic development, the demand for energy is rapidly increasing, and mining is gradually going deeper. Safety accidents such as mine earthquakes, coal and gas outbursts occur frequently, causing heavy casualties and economic losses. At the same time, my country's investment in infrastructure construction such as tunnels and bridges is also increasing. Especially in western China, a large number of deep-buried tunnels and large-span bridges have emerged, which poses greater safety risks. It is urgent to study effective methods for safety monitoring of large geological projects. Microseismic is an accompanying phen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 王静王正方隋青美叶青霖田长彬李亦佳向力为贾磊
Owner SHANDONG UNIV
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