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Simultaneous detection of molecular oxygen and water vapor in the tissue optical window using tunable diode laser spectroscopy

机译：使用可调二极管激光光谱仪同时检测组织光学窗口中的分子氧和水蒸气

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摘要

We report on a dual-diode laser spectroscopic system for simultaneous detection of two gases. The technique is demonstrated by performing gas measurements on absorbing samples such as an air distance, and on absorbing and scattering porous samples such as human tissue. In the latter it is possible to derive the concentration of one gas by normalizing to a second gas of known concentration. This is possible if the scattering and absorption of the bulk material is equal or similar for the two wavelengths used, resulting in a common effective pathlength. Two pigtailed diode lasers are operated in a wavelength modulation scheme to detect molecular oxygen similar to 760 nm and water vapor similar to 935 nm within the tissue optical window (600 nm to 1.3 mu m). Different modulation frequencies are used to distinguish between the two wavelengths. No crosstalk can be observed between the gas contents measured in the two gas channels. The system is made compact by using a computer board and performing software-based lock-in detection. The noise floor obtained corresponds to an absorption fraction of approximately 6 x 10(-5) for both oxygen and water vapor, yielding a minimum detection limit of similar to 2 mm for both gases in ambient air. The power of the technique is illustrated by the preliminary results of a clinical trial, nonintrusively investigating gas in human sinuses. (D 2008 Optical Society of America
机译：我们报告了同时检测两种气体的双二极管激光光谱系统。通过对吸收样品（例如空气距离）以及吸收和散射多孔样品（例如人体组织）进行气体测量来证明该技术。在后者中，可以通过归一化为已知浓度的第二种气体来推导一种气体的浓度。如果对于所使用的两个波长，散装材料的散射和吸收相等或相似，则这是可能的，从而导致共同的有效光程。两个尾纤二极管激光器以波长调制方案运行，以检测组织光学窗口（600 nm至1.3μm）内的类似于760 nm的分子氧和类似于935 nm的水蒸气。使用不同的调制频率来区分两个波长。在两个气体通道中测量的气体含量之间没有观察到串扰。通过使用计算机板并执行基于软件的锁定检测，可以使系统紧凑。对于氧气和水蒸气，获得的本底噪声对应于大约6 x 10（-5）的吸收率，对于环境空气中的两种气体，其最低检测极限类似于2 mm。临床试验的初步结果说明了该技术的力量，该研究非侵入式地研究了人鼻窦内的气体。 （D 2008美国眼镜学会

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