面向气体绝缘设备故障检测的高灵敏SO2光声气体传感器

A Highly Sensitive SO2 Photoacoustic Gas Sensor for Fault Detection in Gas-Insulated Equipment

摘要:

针对气体绝缘开关设备（GIS）中二氧化硫（SO₂）浓度高灵敏度检测的需求，设计并构建了一种基于 LD 泵浦全固态调 Q 激光器的紫外光声气体传感器。该传感器以中心波长为 266 nm、发射功率高达 36. 93 mW 的紫外激光器为光声信号激励光源，采用体积仅 0. 39 mL 的非共振光声池对微弱光声信号进行放大增强，最终通过检测光声信号实现对 SO₂浓度的在线反演。通过优化调制频率等关键参数，传感器在室温和常压条件的 SO₂探测灵敏度可达到 286. 9 ppb（在 1 s 积分时间内实现），且实验结果表明，当延长积分时间至 100 s 时，最低检测限低至 9. 1 ppb。该光声探测传感器具有高灵敏度、良好选择性和长期稳定性，能够为 GIS 设备潜在故障的早期诊断提供高效、可靠的技术支持。

Abstract:

To address the need for high-sensitivity detection of sulfur dioxide （SO₂） concentrations in gasinsulated switchgear （GIS）， this study designs and develops an ultraviolet photoacoustic gas sensor based on an LDpumped all-solid-state Q-switched laser. The sensor uses a UV laser with a central wavelength of 266 nm and an emission power of up to 36. 93 mW as the excitation source for the photoacoustic signal. A non-resonant photoacoustic cell with a volume of only 0. 39 mL is employed to amplify weak photoacoustic signals. By detecting these signals， the SO₂ concentration is determined in real time. Through the optimization of key parameters such as modulation frequency， the sensor achieves a detection sensitivity of 286. 9 ppb at room temperature and under atmospheric pressure， with a 1-second integration time. Experimental results further demonstrate that the minimum detection limit can reach 9. 1 ppb when the integration time is extended to 100 seconds. This photoacoustic detection sensor exhibits high sensitivity， excellent selectivity， and long-term stability， providing efficient and reliable technical support for the early diagnosis of potential GIS equipment faults.