Light path reflection enhanced furfural detection system

By using an optical path reflection enhancement detection system, visible light is made to pass through the thermal lens region twice using a dichroic mirror and an optical path extension unit. This solves the problem of insufficient detection sensitivity of furfural in transformer oil and improves detection accuracy and stability.

CN122409541APending Publication Date: 2026-07-17CHINA YANGTZE POWER
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Patent Information

Application Number
CN202610309668.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-13
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing methods for detecting furfural in transformer oil lack sufficient sensitivity, making it difficult to meet the real-time monitoring needs in online, in-situ, or energized conditions. Furthermore, there is room for improvement in the signal acquisition efficiency of traditional transmissive optical path configurations.

Method used

An optical path reflection enhancement detection system is adopted, which uses a dichroic mirror to achieve optical path coupling between infrared light and visible light. This allows visible light to pass through the thermal lens region excited by infrared light twice by reflection, and then undergo multiple reflections through the optical path extension unit to amplify the signal. Combined with the signal modulation unit, the electrical signal is converted and processed.

Benefits of technology

It improves the accuracy and stability of furfural detection, enhances the detection accuracy of furfural concentration in transformer oil, suppresses common-mode noise, and improves the system's measurement stability and environmental adaptability.

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Abstract

The invention relates to an optical path reflection enhanced furfural detection system, which is characterized in that an infrared light modulation unit generates and modulates infrared light, the modulated infrared light enters a dichroscope, the infrared light is transmitted to a fixed optical path sample cell through the dichroscope, and the infrared light excites transformer oil in the fixed optical path sample cell to generate a thermal lens effect. The visible light modulation unit generates and modulates visible light, the modulated visible light passes through the fixed optical path sample cell for the first time and then enters the dichroscope, the visible light passes through the fixed optical path sample cell for the second time after being reflected by the dichroscope, and the visible light output by the fixed optical path sample cell enters the optical path extension unit for transmission. Visible light output by the optical path extension unit enters the signal modulation unit, and an optical signal is converted into an electric signal and modulated; the upper computer is in electric signal connection with the signal modulation unit, and the upper computer obtains the electric signal output by the signal modulation unit and calculates the furfural concentration value. The light path reflection enhanced furfural detection system provided by the invention improves the detection precision.
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