一种用于原位痕量气体检测的光纤尖端光声传感器。

A fiber-tip photoacoustic sensor for in situ trace gas detection.

作者信息

Zhou Sheng, Iannuzzi Davide

机构信息

Department of Physics and Astronomy, VU University Amsterdam, Amsterdam, The Netherlands.

出版信息

Rev Sci Instrum. 2019 Feb;90(2):023102. doi: 10.1063/1.5082955.

DOI:10.1063/1.5082955

PMID:30831736

Abstract

Most trace gas detection methods developed so far largely rely on active sampling procedures, which are known to introduce different kinds of artifacts. Here, we demonstrate sampling-free in situ trace gas detection in millimeter scale volumes with fiber coupled cantilever enhanced photoacoustic spectroscopy. Our 2.4 mm diameter fiber-tip sensor is free from the wavelength modulation induced background signal (a phenomenon that is often overlooked in photoacoustic spectroscopy) and reaches a normalized noise equivalent absorption coefficient of 1.3 × 10 W cm Hz for acetylene detection. To validate its in situ gas detection capability, we inserted the sensor into a mini fermenter for headspace monitoring of CO production during yeast fermentation. Our results show that the sensor can easily follow the different stages of the CO production of the fermentation process in great detail.

摘要

迄今为止开发的大多数痕量气体检测方法在很大程度上依赖于主动采样程序，而众所周知，这种程序会引入各种伪像。在此，我们展示了利用光纤耦合悬臂增强光声光谱技术在毫米级体积内进行免采样原位痕量气体检测。我们直径为2.4毫米的光纤尖端传感器没有波长调制引起的背景信号（这是光声光谱中经常被忽视的一种现象），在检测乙炔时达到了1.3×10⁻¹¹W cm⁻¹ Hz⁻¹/²的归一化噪声等效吸收系数。为了验证其原位气体检测能力，我们将该传感器插入一个小型发酵罐中，用于监测酵母发酵过程中CO₂的顶空产生情况。我们的结果表明，该传感器能够轻松且非常详细地跟踪发酵过程中CO₂产生的不同阶段。