Simultaneous Detection of Photoacoustic and Fluorescence Signals

已尝试使用配备有为本目的而设计的光声单元的X射线荧光光谱仪同时测量光声和荧光信号。对金属箔和具有层状结构的模型样品进行了联合测量。荧光测量提供了有关样品元素的信息，光声信号提供了有关样品的X射线吸收总量和热性质的信息。同样的样品也通过可见光的普通光声测量进行了检查。与单独使用这些技术相比，在联合测量中使用不同的激发波长可以提供关于热和结构性质的更详细的信息。利用同步辐射的单色X射线束作为激发源，成功地进行了光热偏转测量。记录了厚度为20微米的铜箔的信号，积分时间为12.5s，信噪比约为50。信号强度与斩波频率成反比关系。用两种光学装置(直接偏转和小角度偏转)测量了钼箔样品的光束偏转。在直接排列中，样品和探针束必须仔细排列，但记录的信号的信噪比更好。

A simultaneous measurement of photoacoustic and fluorescence signals has been attempted using an X-ray fluorescence spectrometer equipped with a photoacoustic cell designed for the present purpose. The combined measurement was conducted for metal foils and model samples with layered structures. The fluorescence measurement gave information concerning the elements of the samples and the photoacoustic signal gave information Concerning the total amount of X-ray absorption and the thermal properties of the samples. The same samples were also examined through ordinary photoacoustic measurements by visible light. The use of different excitation wavelengths in the combined measurement was found to give more detailed information about the thermal and structural properties than the individual use of these techniques.Photothermal deflection measurement was successfully carried out using a monochromated X-ray beam of synchrotron radiation as an exciting source. The signal for copper foil of 20mum thickness was recorded with integration time of 12.5s showing a signal to noise ratio of about 50. The signal intensity had a reciprocal dependency on the chopping frequency. Two optical arrangements(direct and low angle deflection) were conducted to detect the beam deflection for a molybdenum foil sample. In the direct arrangement, the sample and the probe beam must be carefully arranged, but the recorded signal was found better in signal to noise ratio.