Multi-wavelength absorption water sensor

By designing an immersible device including a broadband light source, a diffraction grating and a linear sensor array, the problem of difficulty in achieving ultraviolet wavelength resolution and measurement compensation of less than 1 nm in the prior art is solved, and high-precision measurement of organic compounds and nitrogen compounds is achieved.

CN119715432APending Publication Date: 2025-03-28ABB (SCHWEIZ) AG
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Patent Information

Application Number
CN202411358876.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-09-24
Filing Date
2024-09-27
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

Prior art When measuring organic and nitrogen compounds in water, it is difficult to achieve wavelength resolution of less than 1 nm in the UV region, while providing sufficient measurement compensation in the visible and near-infrared regions, resulting in poor measurement performance in challenging applications.

Method used

An immersible device is designed, which includes a broadband light source, a measurement area, a light sensor, an optical slit, a diffraction grating and a linear sensor array. The broadband light is decomposed into narrow ultraviolet bandwidth areas through a diffraction grating, and the light intensity of these areas is detected using a linear sensor array to achieve a wavelength resolution of less than 1 nm. At the same time, interference caused by particles, colloids, etc. is compensated for by visible light or near-infrared light sensors.

Benefits of technology

A wavelength resolution measurement of less than 1 nm in the ultraviolet light region is achieved, while providing effective measurement compensation in the visible and near-infrared light regions, improving the measurement accuracy and reliability of organic compounds and nitrogen compounds.

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Abstract

The invention relates to a multi-wavelength absorption water sensor. An apparatus and method are provided for measuring the absorption of a liquid at a plurality of high resolution wavelengths in the ultraviolet spectrum, as well as in the visible and / or near infrared light spectrum, of an additional wavelength or set of wavelengths. The device comprises a housing immersible in a liquid, the housing comprising a broadband light source emitting ultraviolet light, visible light and near-infrared light, an optical window defining a measurement area of the liquid, optical chopper units alternating between a reference beam and a measurement beam, an optical system includes a broadband light source, an optical sensor that detects a particular wavelength or set of wavelengths in the spectrum of visible light or near infrared light from the broadband light source, a slit that defines broadband light geometry onto a diffraction grating, the diffraction grating that modifies the broadband light beam to a wavelength of ultraviolet light at high wavelength resolution, and a line sensor that detects ultraviolet light at high wavelength resolution.
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