Stress sensor and stress measurement method based on fiber optic resonator vernier effect

Abstract

The invention discloses a stress sensor and a stress measurement method based on the vernier effect of an optical fiber resonator. The sensor includes a light source, an optical fiber coupler, an optical fiber ring, a long-period optical fiber grating, a spectrometer and a processing system; the optical output end of the light source is connected to the optical fiber coupler The first optical input end of the fiber coupler, the second optical input end and the second optical output end of the fiber coupler are respectively connected to the two ends of the fiber ring, the long-period fiber grating is connected to the middle of the fiber ring, and the first optical output end of the fiber coupler Connect the optical input end of the spectrometer, the electrical output end of the spectrometer is connected to the electrical input end of the processing system, and the electrical output end of the processing system outputs the sensor output signal; the optical fiber coupler, the optical fiber ring, and the long-period fiber grating form a fiber resonant cavity; The sensitive element is a long-period fiber grating, and the vernier effect of the fiber resonant cavity is the same as the measuring principle of the vernier caliper. The invention has the advantages of simple structure, no influence of electromagnetic field on the sensitive element, and high precision.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a stress sensor and a stress measurement method based on the vernier effect of an optical fiber resonant cavity. Background technique [0002] The stress sensor is a device that converts the stress into an available output signal by using the law that the properties of the material change with the stress. The measurement and control of the stress can be used in actual production practice to maintain production safety, ensure product quality, and improve production efficiency. For It plays a very important role in promoting the development of the national economy. Due to the universality of stress measurement, the number and types of stress sensors are various. In fact, the characteristics of many materials and components change with the change of stress, so there are quite a lot of materials and components that can be used for stress sensors. At present, the most commonly...

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Problems solved by technology

[0004] Based on the above deficiencies, the present invention provides a stress sensor and stress measurement method based on the vernier effect of the fiber resonator, which overcomes the problems of the current stress sensor with complex structure, easy to be affected by electromagnetic fields, and low sensing accuracy

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