Inertia parameter sensing device based on spring optical fiber microbending loss

Abstract

The invention discloses an inertia parameter sensing device based on spring optical fiber microbending loss, which comprises a multi-ring spring member composed of a spring wire, wherein the upper surface and the lower surface of the spring wire are respectively provided with a plurality of staggered corresponding deformed teeth along the longitudinal direction of the spring wire, and a signal optical fiber is clamped between the deformed teeth of the upper surface and the lower surface; and one end of the spring member is fixed with an oscillator. When inertia parameters are changed, if the vibration occurs in, the oscillator immediately responds and drives positions at two ends of the spring member to be changed as well as causes that the distance between the two adjacent rings of spring wire in the spring member is changed, thereby ensuring the positions between the deformed teeth on the lower surface of the upper spring wire and the deformed teeth on the upper surface of the lower spring wire in the two rings of spring wire are changed to cause that the bending loss of the signal optical fiber is changed; parameters of amplitude, frequency and the like of the vibration of the oscillator response are inferred, and the inertia parameter is obtained. The inertia parameter sensing device has the advantages of high accuracy, low failure rate and wide application prospect.

Description

technical field [0001] The invention relates to an inertia parameter sensor, more precisely, relates to a high-precision optical fiber type inertia parameter sensing device based on the change of microbending loss of spring type optical fiber. Inertia parameters include parameters such as acceleration, vibration amplitude, and vibration frequency. Background technique [0002] Acceleration, vibration and other inertia parameter testing instruments are widely used in various industries, such as geological exploration, transportation, precision machinery, high-precision instruments, power generation, aerospace and other fields. In the field of seismic exploration, vibration testing devices are used To collect seismic wave signals, these data can be processed to invert the underground geological structure, which is widely used in petroleum, coal and mining industries. In the past few decades, electromagnetic geophones were usually used, but with the influence of factors such a...

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Problems solved by technology

Among them, optical fiber technology has attracted the attention of researchers with its unique advantages. Optical fiber sensing technology has the advantages of anti-electromagnetic interference, large dynamic range, long-distance transmission, and easy construction of distributed or array sensing systems. Micro-bend sensing technology has low cost, easy measurement, high measurement frequency, and large dynamic range. In particular, its advantages in measurement frequency and dynamic range are very prominent. The measurement frequency can easily reach up to MHz, while conventional electromagnetic vibration detection The sensor is generally within hundreds of Hz. In terms of dynamic range, the fiber optic microbend sensing technology can easily achieve more than 200dB, and it can be even higher, while it is difficult for conventional electromagnetic vibration detectors to achieve 100dB. , but most of the existing optical fiber vibration sensors based on microbending loss technology have not fully explored this potential. For example, the Chinese patent application number 200410046705.9 discloses "Feedback Optical Fiber Resonance Sensor"; Component fiber optic vibration measurement device", because of its structural design defects, it has not fully utilized and reflected the advantages of fiber optic microbend sensing technology

At present, more optical fiber vibration sensors are mainly concentrated on the technology with fiber grating as the core. For example, the Chinese patent whose authorization announcement number is CN2784933Y discloses "Fiber Bragg Grating Acceleration Sensor"; Arm Beam Fiber Bragg Grating Vibration Sensor "; Publication No. CN 1587946A Chinese patent discloses "Optical Fiber Micro Vibration Sensor Based on Fiber Bragg Grating"; Publication No. CN1752729A Chinese Patent Publication "Fiber Bragg Grating Vibration Sensor for Tunable Matched Filter Demodulation" However, the main problems of fiber optic vibration sensors based on fiber gratings are small dynamic range, high cost of test instruments, low test frequency, difficulty in packaging fiber gratings, and difficulty in building distributed or array sensing systems, which limits the scope of use of this type of sensor

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