用于痕量气体监测的多功能积分球光声传感器
A versatile integrating sphere based photoacoustic sensor for trace gas monitoring
摘要：
报道了一种用于痕量气体检测的小型多功能光声传感器。该传感器是基于一个积分球作为PA吸收池与器官管连接，以增加PA传感器的灵敏度。的PA信号的灵敏度的多功能性和增强的影响，通过监测特定的振转线的CO2在2毫米波长区域和NO2在405 nm区域。测量的PA信号的增强因子超过1200，这是由于管的声共振和积分球相对于非共振单程室的吸收增强。据观察，由于聚四氟乙烯细胞壁中的热传导和扩散效应，背景吸收信号被高度衰减。这表明，仔细选择细胞壁材料可以对PA传感器的灵敏度非常有益。这些特性使该传感器适用于紫外到近红外波长区域的各种实际传感器应用，包括气候、环境和工业监测。
英文摘要：
A compact versatile photoacoustic (PA) sensor for trace gas detection is reported. The sensor is based on an integrating sphere as the PA absorption cell with an organ pipe tube attached to increase the sensitivity of the PA sensor. The versatility and enhancement of the sensitivity of the PA signal is investigated by monitoring specific ro-vibrational lines of CO2 in the 2 mm wavelength region and of NO2 in the 405 nm region. The measured enhancement factor of the PA signal exceeds 1200, which is due to the acoustic resonance of the tube and the absorption enhancement of the integrating sphere relatively to a non-resonant single pass cell. It is observed that the background absorption signals are highly attenuated due to the thermal conduction and diffusion effects in the polytetrafluoroethylene cell walls. This demonstrates that careful choice of cell wall materials can be highly beneficial to the sensitivity of the PA sensor. These properties makes the sensor suitable for various practical sensor applications in the ultraviolet to the near infrared wavelength region, including climate, environmental and industrial monitoring.
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