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In-situ measurements on carbon aerosols with photoacoustic spectroscopy

机译：用光声光谱法对碳气溶胶​​进行原位测量

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Abstract: Up to now photoacoustic spectroscopy is the only available approach for an on- line and in-situ measurement of the absorption of radiation by airborne particles. The main disadvantage of the method is the need for a high-power laser in the visible or infrared spectral region with an optical output of 1 W or more as radiation source to achieve a detection limit for particulate carbon in the order of 1 $mu@g/m$+3$/. For the first time to our knowledge a laser diode was used to test the properties of this laser type as light source for photoacoustic spectroscopy of aerosols. The advantages of a laser diode compared with other high-power lasers in the visible are the emission wavelength of 800 nm, the small size of the laser, and the possibility of an electronic intensity modulation of the light instead of a modulation by a mechanical chopper, which results in a decreased background signal and an extended modulation frequency range.!9
机译：摘要：迄今为止，光声光谱法是在线和现场测量空气中颗粒物吸收辐射的唯一可行方法。该方法的主要缺点是需要在可见光或红外光谱区域中使用功率为1 W或更高的高功率激光器作为辐射源，以实现对颗粒碳的检出限为1 $ mu @。 g / m $ + 3 $ /。据我们所知，首次使用激光二极管来测试这种激光类型的特性，作为气溶胶光声光谱学的光源。与可见光中的其他大功率激光器相比，激光二极管的优点是发射波长为800 nm，激光器尺寸小，并且可以对光进行电子强度调制，而不是通过机械斩波器进行调制，这会导致背景信号减少和调制频率范围扩大。！9

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