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光纤光热干涉气体检测技术研究进展
Advances in optical fiber photothermal interferometry for gas detection
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摘要: 本文阐述光纤光热干涉气体检测的基本原理,从光纤光热相位调制的产生、动态过程、探测方法以及响应时间等方面出发,综述本研究组在光纤光热干涉气体检测方面的最新工作进展.光纤光热干涉技术具有灵敏度高、动态范围大、测量不受散射及其他损耗影响等优势,能够实现小型化、多点复用、组网及远程监测,在环境、医疗、安防等领域具有重要的应用.Abstract: We report our recent work on the development of a highly sensitive gas detection technique-photothermal interferometry spectroscopy with hollow-core optical fibers.The basic principle of operation,generation and detection of dynamic photothermal phase modulation,and method to improve the response time of the hollow-core fiber sensors are described.The technique has ultra-high sensitivity and dynamic range,and the measurement is not affected by reflection/scattering and other non-absorbing losses.Sensors based on such a technique could be made compact in size with remote detection,multiplexing and networking capability,which would enable a range of high performance applications in environmental,medical and safety monitoring.
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