论文部分内容阅读
超声信号能引起SU-8材料的厚度变化,将一薄层厚度均匀的SU-8膜镀在盖玻片上,再镀一层均匀金属银制成光滑反射面,制作了一个光声传感器,并借助此传感器计了一套实时、动态的光声成像系统。该光声成像系统中,吸收性样品的光声信号引起光声探测器上SU-8材料厚度变化,当一束激光经过探测器反射面时,该厚度变化将会调制反射光的相位,系统借助光学相衬滤波法解调该相移,得到SU-8的厚度变化量,获取与样品光声信号的分布对应的光强分布,从而获得样品的动态实时光声像。对光声信号的产生(光致超声效应)、光声信号的调制、光声信号的解调(传感器的制作)进行了论述,并对SU-8光声探测器对光声信号的感应特性做了初步实验研究,结果验证了SU-8能够探测光声信号。
Ultrasound signals can cause changes in the thickness of the SU-8 material, a thin layer of uniform SU-8 film was coated on a cover glass, and then coated with a uniform layer of silver metal made smooth reflective surface, made a photoacoustic sensor and With this sensor a set of real-time, dynamic photoacoustic imaging system has been built. In the photoacoustic imaging system, the photoacoustic signal of the absorbing sample causes a change in the thickness of the SU-8 material on the photoacoustic probe. When a beam of laser light passes through the detector reflecting surface, the thickness variation will modulate the phase of the reflected light. The system The optical phase contrast filter was used to demodulate the phase shift to get the thickness variation of SU-8, and obtain the light intensity distribution corresponding to the distribution of the photoacoustic signal, so as to obtain the dynamic real-time photoacoustic image of the sample. The photoacoustic signal generation (photo-induced ultrasonic effect), the photoacoustic signal modulation, the photoacoustic signal demodulation (sensor production) are discussed, and the SU-8 photoacoustic probe for photoacoustic signal sensing characteristics A preliminary experimental study was done and the results verified that SU-8 can detect photoacoustic signals.