Method used for array waveguide optical grating demodulating system temperature compensation in smart clothes

Abstract

The invention discloses a method used for array waveguide optical grating demodulating system temperature compensation in smart clothes. The central wavelength lambda i of all channel output spectrums of an array waveguide optical grating has a temperature drift phenomenon, when human body temperature measurement is carried out through an array waveguide optical grating demodulating system in the smart clothes, due to the fact that the temperature difference among the left chest, the right chest, the left axilla, the right axilla and the back in the human body is within the range of 1.7 DEG C, the temperature variation value delta T of the array waveguide optical grating and a fiber bragg grating is considered to be integrated, the central wavelength is replaced with a relational expression containing the delta T, and an array waveguide optical grating temperature demodulating formula with the temperature compensation is derived. According to the method, the result of temperature demodulating shows that a kind of stable linear relation exists between a temperature value and a light intensity comparison value, temperature sensitivity is 0.25733 dB / DEG C, and demodulating precision of the array waveguide optical grating demodulating system used for the human body temperature measurement in the smart clothes can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber Bragg grating sensing and demodulation, in particular to human body temperature detection using optical fiber Bragg grating as a sensor and an arrayed waveguide grating as a demodulation device, which is applied in smart clothing. Background technique [0002] Fiber Bragg grating sensor is a new type of sensor, and it is widely used for its anti-electromagnetic interference, light weight, and high sensitivity. Commonly used demodulation methods include FBG tunable filter detection method, tunable optical fiber F-P filter detection method, unbalanced M-Z interferometer detection method, adjustable narrow-band light source detection method and active detection method, etc., but these demodulation methods are very difficult. It is difficult to simultaneously meet the requirements of the fiber Bragg grating demodulation system for multi-node, high precision, and dynamic and static wavelength dem...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention: to provide a temperature compensation method for the demodulation system of the arrayed waveguide grating used in smart clothing, to solve the problems of high cost and complex structure of the arrayed waveguide grating temperature compensation method realized through the design of the chip structure, which will further Promoting the Wide Application of Arrayed Waveguide Grating Demodulation System in Temperature Measurement of Smart Clothing

Images