【摘要】 研究了一维情况下,光激励液体辐射光声波的特性.通过解声压波动方程,得到光激励流体辐射产生的光声波的时间函数,研究了空间热函数与时间δ函数乘积所描绘的热沉积产生的超声波情况.结果表明:热的空间沉积形式直接描绘光声波的时间图像,对于脉冲宽度比声波通过声源的时间长的激光来说,光声波形也是与激光脉冲时间图形相称的,同时,也导出了具有任意空间函数辐射源的多级辐射表达式.更多还原

【Abstract】 The time dependence of the photoacoustic wave generated by irradiation of liquid with optical radiation can be found by solution of the wave equation for pressure in one dimension,also with the generation of ultrasonic wave where heat deposition is described by a spatial heating function times a delta function in time.The solution shows that the spatial deposition of heat is directly mapped in to the time profile of the photoacoustic wave.For laser pulses long compared with the transit time of sound across the irradiated body,the photoacoustic waveform is directly proportional to the intensity of the exciting radiation pulse,also the multipole radiation in one dimension is presented.更多还原