【报告题目】：Compact and high sensitivity in-situ trace gas monitoring with laser photoacoustic spectrosopy
【报告人】：刘丽娴副教授，西安电子科技大学
【报告时间】：2024年5月24日（周五）14:30
【报告地点】：科技北楼29-218
【报告内容】：Enhancing multi-gas detectability using photoacoustic spectroscopy capable of simultaneous detection, highly selectivity and less cross-interference is essential for trace gas detection. We investigated three types of photoacoustic resonators for different designated applications namely transformer oil dissolved and greenhouse gas monitoring: 1) A T-type cell with multiple resonances was designed and verified to be an appropriate sensor for the oil dissolved gas detection, due to the resonant frequencies of which are determined jointly by absorption and resonant cylinders. The three designated resonance modes were investigated to present the comparable amplitude responses by introducing excitation beam position optimization. The capability of multi-gas detection was demonstrated by measuring CO, CH4 and C2H2 simultaneously using Quantum Cascade Laser (QCL), Interband Cascade Laser (ICL) and distributed feedback lasers as excitation sources respectively. The experimentally determined minimum detection limits (MDL) of CO, CH4 and C2H2 were 89ppb, 80ppb and 664ppb respectively. 2) Three optimized differential cells combined with QCLS were introduced for the greenhouse gas detection due to the extreme-high sensitivity requirements. The influence of ambient parameters such as flow rate, pressure and humidity have been examined and optimized. With 5s lock constant of the self-designed processing unit, the MDLs of the main greenhouse targets were 3ppb (CH4), 0.3 ppb (CO) and 8ppb (CO2). This greenhouse gas sensor was deployed in an observatory of Tongchuan, Shaanxi (one of the small and medium-sized pilot cities for the Carbon Monitoring Project). These application results demonstrate the laser photoacoustic spectroscopy technology is feasible for multiple trace gas detection with good selectivy and high sensitivity.
【报告人简介】刘丽娴，西安电子科技大学光电工程学院副教授，博士生导师，光电工程学院光电仪器系书记，光电仪器系副主任。2022年获XX教育部LH青年人才项目支持。2023年获陕西省秦创原科学家+工程师团队首席科学家。2017年获电子科技大学光学工程博士学位，2014年至2016年，加拿大多伦多大学联合培养博士生。
主要从事高性能痕量气体探测、高精度光学检测技术、激光技术与应用等方面研究。在国内外高水平期刊发表SCI论文40余篇，其中第一作者和通讯作者发表在IEEE Transactions on Industrial Electronics、Optics Letters 和Photoacoustics等期刊34篇，H-index为12，申请国家发明专利16项，授权9项。主持国家自然科学基金面上项目、国家自然科学基金青年项目、教育部联合基金、陕西省产业链揭榜挂帅项目、陕西省自然科学基金项目、浙江省重点实验室项目、中国博士后科学基金特别资助、中国博士后科学基金面上项目和其他多个某部队研究课题。担任《现代应用物理》、《Frontiers in Mechanical Engineering》等杂志编辑。
