Abstract:In clinical applications, the measurement of blood flow velocity in many affected areas needs to be performed under aseptic conditions. However, the traditional photoacoustic flow measurement methods based on ultrasonic transducers,the ultrasonic coupling medium between the probe and the detection area need to be filled, and thus sterile operation cannot be achieved, which could restrict clinical application. In this paper, a noncontact photoacoustic Doppler flowmetry is reported, and a low coherent Michelson interferometer is used to detect the photoacoustic signal to realize the velocity measurement. Compared with the photoacoustic Doppler flowmetry using the ultrasonic probe, this method can realize noncontact photoacoustic flow measurement. The transverse flow ranging from 0.23 mm/s as well as sectional flow imaging could be quantitatively measured measurement in the bloodmimicking flow phantoms. Besides, the blood flow imaging of the mouse ear in vivo show that this method can quantitatively measure blood flow information in a noncontact fashion.