Intelligent bolt based on MEMS optical fiber pressure sensor

Abstract

The invention discloses an intelligent bolt based on an MEMS optical fiber pressure sensor, comprising a metal ball, a welding point, an MEMS optical fiber pressure sensor, an alloy hollow structuralpart, a connector and an optical fiber insertion core. Threads used for fixing a detection sensor are machined on the outer surface of the alloy hollow structural part. The MEMS optical fiber pressuresensor and the connector are connected through a metal sleeve to form a device. The optical fiber insertion core is arranged above the connector. According to the invention, the MEMS optical fiber pressure sensor is arranged in an intelligent bolt monitoring sensor, so that the advantage of the MEMS optical fiber pressure sensor for measuring the pressure with ultrahigh precision can be fully exerted, and the measurement precision of + / -0.05% can be realized. The intelligent monitoring precision, linearity and sensitivity of the bolt can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a smart bolt based on a MEMS optical fiber pressure sensor. Background technique [0002] Resonance principle of fiber optic MEMS-FP resonator. The FP resonant cavity is composed of MEMS double parallel mirrors. When the frequency of the incident light satisfies its resonance condition, its transmission spectrum will have a very high peak value, corresponding to a high transmittance. Lock the peak value, calculate the peak value change caused by the change of FP cavity length, and derive the corresponding physical quantity. [0003] This high-precision optical fiber MEMS pressure sensor uses the Fabry-Perot (F-P) interference principle to convert the pressure change into the cavity length change of the F-P pressure sensitive cavity inside the sensor. The F-P pressure sensitive cavity is composed of two parallel planes with a certain reflectivity. The beam is reflected multiple ...

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Problems solved by technology

[0006] The above technology has the following defects: 1. How to ensure the real-time online intelligent monitoring of bolts; 2. How to realize the long-term reliability of the bolt detection sensor, the reliability during use, vibration resistance, high and low temperature, waterproof, Dustproof; 3. How to realize that the bolt detection sensor can deform synchronously with the bolt, and the sensor has ultra-high measurement accuracy; 4. How to realize the low cost of the bolt detection sensor and can be mass-produced

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