We reported the development of a quartz-enhanced photoacoustic sulfur hexafluoride (SF 6 ) sensor for ventilation studies using a continuous-wave distributed-feedback quantum cascade laser (QCL) at 10.5 µm. The SF 6 sensor was developed by detecting the gas-absorption induced acoustic wave using a tiny quartz tuning fork that is enclosed in a gas cell with a sample volume of 2.5 ml. By locking the QCL wavelength at the absorption peak of SF 6 , we obtained a recording time interval of 0.4 s and a detection limit of 4.6 ppb. The sensor response time (t 90 ) was found to be 2.8 s at a flow rate of 550 ml min −1 . The sensor was then implemented in measuring air exchange rates in a laboratory room using the standard tracer gas concentration decay method. Our measurements are in good agreement with a commercial analyzer when studying two typical passive ventilation scenarios of infiltration and natural ventilation. Additionally, the deve...

中文翻译：

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使用石英增强的光声SF 6气体传感器快速现场测量通风率

我们报道了使用10.5 µm的连续波分布反馈量子级联激光器（QCL）进行通风研究的石英增强型光声六氟化硫（SF 6）传感器的开发。SF 6传感器是通过使用微型石英音叉检测气体吸收感应声波而开发的，该石英音叉被封闭在气室中，样品体积为2.5 ml。通过将QCL波长锁定在SF 6的吸收峰上，我们获得了0.4 s的记录时间间隔和4.6 ppb的检测限。发现在550ml min -1的流速下，传感器响应时间（t 90）为2.8s。然后，使用标准示踪气体浓度衰减方法将传感器安装在实验室的空气交换率测量中。在研究渗透和自然通风的两种典型被动通风场景时，我们的测量值与商用分析仪非常吻合。此外，开发人员...