Waveguide interference sensor

Abstract

The invention relates to the technical field of waveguide sensors. A novel Michelson interferometer for sensing measurement is designed by using the principle of waveguide nonlinear environment, and has a basic structure that two output ports of a 2*2 waveguide coupler of Mach-Zehnder interferometer are connected by waveguide, wherein the splitting ratio of the waveguide coupler is 1 to 1; or the middle part of a small section of waveguide (fiber) is directly rolled to manufacture a 2*2 waveguide coupler of which splitting ratio is 1 to 1; and the waveguide coupler is connected with another 2*2 waveguide coupler to form the Michelson interferometer. The waveguide interference sensor with low cost and same phase change and reflectivity at two reflection parts is provided with the novel Michelson interferometer structure so as to achieve the effects of improving interference contrast and improving measurement sensitivity.

Description

technical field [0001] The invention relates to the technical field of waveguide sensors, in particular to a structure of a novel waveguide Michelson interferometer for waveguide sensing. technical background [0002] Waveguide sensors have been widely used in various fields such as industry, agriculture, biology and medicine due to their inherent advantages. The most commonly used modulation methods are light intensity modulation, phase modulation and frequency modulation. The measurement of some physical quantities by optical phase modulation can obtain relatively high sensitivity, and the measurement of some physical quantities by optical frequency modulation can obtain extremely high sensitivity. Regardless of the modulation method used, the sensor is finally converted into a light intensity signal of the corresponding wavelength, and this work is completed by the interferometer. Commonly used waveguide interferometers include Michelson interferometer, Mach-Zehnder int...

AI Technical Summary

Problems solved by technology

First of all, the reflectivity of these mirrors is not high when they are actually used

Second, since the two mirrors cannot be guaranteed to be of exactly the same quality, the beam passing through the mirrors has a certain degree of phase and reflectivity uncertainty variation

Third, long-term use, the performance of the multi-layer dielectric film is partially detached or the waveguide grating is desensitized, and its performance is getting worse and worse.

Fourth, the cost is relatively high due to the use of anti-increasing multilayer dielectric films or fusion-bonded waveguide gratings

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