Liquid refractive index sensing system and method based on optical waveguide structure and weak measurement

By utilizing a liquid refractive index sensing system based on optical waveguide structure and weak measurement, and taking advantage of the polarization phase difference introduced by light reflection at the waveguide interface and combining it with the center wavelength displacement calculation, the system solves the problems of complex manufacturing and high cost of traditional optical sensors. It achieves high sensitivity and high accuracy in liquid refractive index detection and is applicable to fields such as food, petrochemicals, and pharmaceuticals.

CN116297186BActive Publication Date: 2026-04-28ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
CN202310135808.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-20
Publication Date
2026-04-28
Estimated Expiration
2043-02-20

AI Technical Summary

Technical Problem

Existing optical sensors for liquid refractive index measurement suffer from problems such as complex manufacturing, high cost, narrow applicability, or the need to consume raw materials, especially in the determination of sugar, alcohol and food additive content, where high-precision measurement is difficult to achieve.

Method used

A liquid refractive index sensing system based on optical waveguide structure and weak measurement is adopted. The polarization phase difference is introduced by the reflection of light at the waveguide interface, and the phase difference is detected by weak value amplification. The liquid refractive index is calculated by combining the center wavelength displacement. A linear common-path weak measurement system is designed to achieve high sensitivity and high accuracy of liquid refractive index detection.

Benefits of technology

It achieves high sensitivity and high precision in liquid refractive index detection, with good system stability, small measurement error, and easy integration. It is suitable for high-precision liquid refractive index measurement in fields such as food, petrochemicals, and pharmaceuticals.

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Abstract

The application discloses a liquid refractive index sensing system and method based on an optical waveguide structure and weak measurement. The application comprises an SLD light source, a Gaussian filter, a polarizer I, a polarizer II, an optical waveguide, a quarter-wave plate I, a quarter-wave plate II and a spectrometer. The SLD light source emits laser with a center wavelength of 830 nm, and the laser is pre-selected by the front selection polarizer after passing through the Gaussian filter. The light is emitted after multiple total internal reflections on the surface of the waveguide of the liquid to be measured, the phase of the p and s polarizations of the emitted light is adjusted by the wave plate, the light is post-selected by the post-selection polarizer, the emitted light is received by the spectrometer and the center wavelength is analyzed, and finally the refractive index of the liquid to be measured is calculated according to the center wavelength displacement by the computer. The application also provides a liquid refractive index sensing method based on an optical waveguide structure and weak measurement. The application realizes straight-line common path and multiple reflections through the optical waveguide, and has higher stability and sensitivity than traditional measurement methods.
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