Starecki Tomasz, Pietrzak Michał Henryk, Ścisłowski Marcin Kamil
Institute of Electronic Systems, Faculty of Electronics and Information Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland.
XIV LO im. Stanisława Staszica, Nowowiejska 37A, 02-010 Warsaw, Poland.
Sensors (Basel). 2023 Aug 13;23(16):7150. doi: 10.3390/s23167150.
The output signal from a photoacoustic cell based on a symmetrical Helmholtz resonator structure can be substantially increased if a counterphase light stimulation is applied to the cell cavities. However even slight differences in the intensity of the light beams irradiating the cavities may affect the frequency response of the cell and the output signal level. This paper shows the influence of the imbalanced light irradiation on the properties of such a cell. It was found that even at relatively high irradiation mismatch, and even with the photoacoustic signal detection implemented with a single microphone, the influence of the irradiation imbalance on the frequency response of the cell around the resonance frequency is not critical. In the case of differential detection of the photoacoustic signal, the imbalance of the light irradiation does not affect the frequency response of the cell, but only the output signal level.
如果对基于对称亥姆霍兹共振器结构的光声池的腔室施加反相光刺激，那么来自该光声池的输出信号可大幅增加。然而，照射腔室的光束强度即使存在细微差异，也可能影响光声池的频率响应和输出信号电平。本文展示了不平衡光照射对这种光声池特性的影响。研究发现，即使在相对较高的照射失配情况下，甚至在使用单个麦克风实现光声信号检测时，照射不平衡对光声池在共振频率附近的频率响应的影响也并不关键。在光声信号差分检测的情况下，光照射的不平衡不会影响光声池的频率响应，而只会影响输出信号电平。
