Dual-Wavelength Continuous Wave Photoacoustic Doppler Flow Measurement  

作　　者：Hongcai ZHAO Yanbin LIU Tayyab FAROOQ Hui FANG 

机构地区：[1]Institute of Modern Optics,Nankai University,Tianjin 300350,China [2]Institute of Microscale Optoelectronics,Nanophotonics Research Center&Shenzhen Key Laboratory of Micro-Scale Optical Information Technology,Shenzhen University,Shenzhen 518060,China [3]HMN Technologies Co.,Ltd.,Tianjin 300467,China

出　　处：《Photonic Sensors》2022年第1期1-9,共9页光子传感器（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China(Grant No.11774256);the Natural Science Foundation of Guangdong Province(Grant No.2018B03031104).

摘　　要：Photoacoustic Doppler flow measurement based on continuous wave laser excitation owns the merit of clearly presenting the Doppler power spectra.Extending this technique to dual wavelengths can gain the spectral information of the flow sample extra to the flow speed information.An experimental system with two laser diodes respectively operated at 405 nm and 660 nm wavelengths is built and the flow measurement with black and red dyed polystyrene beads is performed.The measured Doppler power spectra can vividly reflect the flow speed,the flow direction,as well as the bead color.Since it is straightforward to further apply the same principle to multiple wavelengths,we can expect this type of spectroscopic photoacoustic Doppler flow measurement will be developed in the near future which will be very useful for studying the metabolism of the slowly moving red blood cell inside microvessels.

关 键 词：Photoacoustic Doppler Doppler power spectra multispectral photoacoustics flow measurement continuous wave laser 

分 类 号：TN2[电子电信—物理电子学]