Optical fiber grating strain sensor with adjustable sensitivity and using method thereof

Abstract

An optical fiber grating strain sensor with adjustable sensitivity comprises a sensor housing, and a left adhesive plate, a spring, a right adhesive plate and an optical fiber with a strain grating provided inside the sensor housing, wherein the portions located on both side of the strain grating on the optical fiber are respectively connected to top ends of left and right adhesive plates throughadhesive points, the inner walls of the left and right adhesive plates are connected by springs, the left end of the first adjustment bolt is connected to the outer wall of the left adhesive plate, the right end of the first adjustment bolt is connected to the first adjustment nut through the left adhesive plate, the inner part of the spring, the right adhesive plate and the first adjustment nut in sequence, the outer walls of the left and right adhesive plates are correspondingly connected to the inner ends of left and right transmission rods, and the outer ends of the left and right transmission rods are correspondingly connected to left and right movable joints through the sensor housing, respectively. This design not only can adjust the sensitivity without changing the package structure, but also can adjust the measurement range, and has a wide application range.

Description

technical field [0001] The invention belongs to the field of optical fiber grating strain sensors, and in particular relates to an optical fiber grating strain sensor with adjustable sensitivity and a using method thereof. Background technique [0002] As one of the more popular high-tech, fiber grating has a series of unique advantages compared with traditional sensors, such as small size, light weight, high precision, passive, anti-electromagnetic interference, good long-term stability, and Optical fiber carriers can transmit signals over long distances, and have great application prospects in aerospace, national defense construction, energy, industrial production, and daily life. [0003] Fiber optic strain sensors are less affected by the environment after they are fully packaged. Compared with traditional strain testing methods such as resistance strain gauges, fiber optic strain sensors not only have better long-term stability and reliability, but also have small size,...

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Problems solved by technology

[0004] However, once the existing optical fiber strain sensor is packaged, the sensitivity and measurement range of the sensor are fixed, and due to different application fields, the requirements for the strain measurement range and sensitivity of the sensor are also different, so it is necessary to design different packaging structures or change Only the packaging structure can meet the actual needs, which leads to a lot of trouble when it is necessary to change the sensitivity of the sensor

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