Integrated Waveguide Optical Biochemical Sensor Based on Optical Power Ratio Demodulation

Abstract

The invention discloses an integrated waveguide optical biochemical sensor based on luminous power specific value demodulation and belongs to the technical field of optical sensing. The integrated waveguide optical biochemical sensor comprises a light path part, a sensing branch and a circuit part, wherein light waves output by a laser device enter a first optical waveguide directional coupler through a first straight optical waveguide to be divided into two paths; the two paths respectively enter a sensing branch optical waveguide and a reference branch optical waveguide; the concentrations of biochemical samples to be detected are different and the optical wave phase changing amounts are different; the light waves which are transmitted by the sensing branch optical waveguide and the reference branch optical waveguide enter a second optical waveguide directional coupler of a branch to be coupled and divided; an obtained optical signal is converted into optical current through a photoelectric detector and enters a data acquiring and processing unit to be converted into luminous power; specific values of the two paths of the luminous power are demodulated so that the concentration of the biochemical sample to be detected is obtained. Based on a photoelectric integration technology, all parts are integrated into one chip so that the size of an optical biochemical sensing detection device is reduced; the integrated waveguide optical biochemical sensor has the advantages of high stability and simplicity and convenience in operation.

Description

technical field [0001] The invention belongs to the technical field of optical sensing, and in particular relates to an integrated waveguide optical biochemical sensor based on optical power ratio demodulation. Background technique [0002] Optical biochemical sensors have broad application prospects in the fields of bioengineering, medical detection, and environmental monitoring. The basic principle is that the substance to be measured interacts with the light wave, so that some physical parameters of the light wave, such as wavelength, intensity, phase, polarization, etc., change, and the concentration and category of the substance to be measured can be obtained by measuring these physical parameters. and other information. [0003] Integrated waveguide optical biochemical sensors have attracted great attention due to their advantages of high sensitivity, less sample size, small volume, and low energy consumption. Integrated waveguide optics based on structures such as wa...

AI Technical Summary

Problems solved by technology

In addition to lasers and photodetectors, the sensor demodulation system also requires digital signal generators, lock-in amplifiers and other equipment, the sensor demodulation system is complex and expensive

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