Fiber-optic amplifier-based apparatus and method for detecting multiple components in transformer oil

By integrating fiber amplifiers and Raman amplification technology and using a combination of multiple DFB lasers, the problems of cross-interference and insufficient sensitivity in photoacoustic spectroscopy were solved, and high-sensitivity detection of multi-component gases in transformer oil was achieved.

CN117470774BActive Publication Date: 2026-06-23HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Filing Date
2023-10-12
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Among existing photoacoustic spectroscopy technologies, far-infrared schemes suffer from significant cross-interference and are expensive, while near-infrared schemes lack sufficient sensitivity and are difficult to detect multiple gases in transformer oil simultaneously.

Method used

Employing a fiber amplifier-based structure, using at least six different DFB lasers, and integrating wavelength division multiplexing and Raman amplification techniques to cover all gas absorption wavelengths, combined with time division multiplexing and frequency division multiplexing, it achieves high-sensitivity detection of multi-component gases.

Benefits of technology

It significantly improves the sensitivity of multi-component gas concentration detection, solves the problems of cross-interference and insufficient sensitivity in existing technologies, and achieves effective amplification of the absorption wavelengths of all gases in transformer oil.

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Abstract

The application provides a transformer oil multi-component gas detection device and method based on a fiber amplifier, belongs to the field of trace gas detection, and comprises at least six different lasers, two different lasers form a group, the lasers in the same group are input to the same optical fiber after being combined by a wavelength division multiplexer, at least two optical fibers are double-clad erbium-ytterbium co-doped optical fibers, a laser pump source is arranged on the double-clad erbium-ytterbium co-doped optical fiber, the multi-path double-clad erbium-ytterbium co-doped optical fiber is input to one side of an optoacoustic cell after being combined, at least one optical fiber is a polarization maintaining optical fiber, the polarization maintaining optical fiber is input to the other side of the optoacoustic cell, a second self-focusing lens and a first self-focusing lens are oppositely arranged and are flush, and a sound signal generated by an optoacoustic effect in the optoacoustic cell is processed to obtain a concentration of a gas to be detected. The application also provides a detection method of the device. The application can overcome the problems of the existing photoacoustic spectroscopy technology, such as large cross interference of a mid-infrared scheme, high price, and insufficient sensitivity of a near-infrared scheme.
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