Apparatus and system for measuring substances in liquid under test by means of plasma spectroscopy

By directly detecting the plasma emission spectrum in aqueous solution using an optical fiber without a focusing element, the problem of existing detection devices being susceptible to the influence of bubbles and aqueous solution characteristics is solved, enabling portable, low-cost, fast, and accurate multi-metal detection.

WO2026076845A1 Publication Date: 2026-04-16HSU CHENG CHE
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Patent Information

Application Number
PCT/CN2025/070089
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-10-11
Filing Date
2025-01-02
Publication Date
2026-04-16

AI Technical Summary

Technical Problem

Existing methods for detecting substances in aqueous solutions cannot simultaneously achieve the following: portability, small device size, simple operation, low cost, simultaneous detection of multiple heavy metals, rapid detection, and minimal interference between different metals. Furthermore, they are easily affected by bubbles and the characteristics of aqueous solutions, leading to a decrease in the intensity and accuracy of the plasma emission spectrum signal.

Method used

Using optical fibers without focusing elements as photodetectors, which are directly placed in the liquid to be detected, the emission spectrum generated by the plasma is directly detected through the optical fiber, avoiding the influence of bubbles and aqueous solution characteristics on the signal. Combined with the simple setup of electrodes and photodetectors, rapid and accurate multi-metal detection is achieved.

Benefits of technology

It effectively improves the intensity and accuracy of plasma emission spectrum, achieving convenient portability, low cost, simple operation, and rapid detection of multiple heavy metals, reducing inter-metal interference, and improving the stability and accuracy of detection.

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Abstract

The present disclosure provides an apparatus and system for measuring substances in a liquid under test by means of plasma spectroscopy. The apparatus comprises: an electrode, at least a part of which is adapted to be arranged in a liquid under test and is adapted to be in contact with said liquid, the electrode being adapted to generate plasma in said liquid by means of an applied voltage, wherein the plasma is located in bubbles generated by the applied voltage; and an optical detection element, which is adapted to detect an emission spectrum generated by the plasma in the bubbles, wherein the optical detection element is an optical fiber, and there is no light converging element between the optical detection element and the plasma.
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