Noncontact photoacoustic imaging by using a modified optical-fiber Michelson interferometer

• 作 者: JiaoLu[1]YingzheGao[2]ZhenheMa[2]YiWang[3]
• 机 构: Schoolof Sino-Dutch Biomedical and Information Engineering,Northeastern University at Shen Yang,Shen
• 出 处: 2015年中国生物医学工程联合学术年会
• 发表日期: 2015年期

　　We design a noncontact photoacoustic imaging(PAI)system in which an optical interferometer is used for ultrasound detection.The noncontact probing technique could improve the practicability of thephotoacousticimaging(PAI)system.The system is based on a modified optical-fiber Michelson interferometer that measures the surface displacement caused by photoacoustic pressure.A synchronization method is utilized to keep the system at its high sensitive region in order to reduce the influence of ambient vibrations on the detection.While the system is at its highly sensitive region,the laser emission,photoacousticinspiration and photoacousticsignal acquisition are accomplished integrally to implement noncontact photoacousticsignal detection in stably and sensitively.The system is experimentally verified by the imaging of a scattering phantom embedded with hairs and the blood vessels within a chick embryo.The experimental results indicate that the proposed system can be used for noncontact PAI with high resolution and high bandwidth.The system has the feasibility to be used as a photoacoustic tomography imaging method,and may provide a kind of possibility of noncontact real-time photoacoustic imaging(PAI).