Measurement and reconstruction of three-dimensional configurations of specimen with tiny scattering based on digital holographic tomography

Based on digital holographic tomography, a method for measuring the three-dimensional (3D) configuration of a transparent object with tiny scattering is proposed. By rotating a Michelson interferometer around static specimen, a series of the phase change distributions of reconstructed object beams carrying the structure information of specimen can be obtained at complete angle range, and the rotation of specimen can be avoided. In addition, phase multiplication of the interferometer can be used to improve the measurement sensitivity of specimen with tiny scattering. And then, as an example, the tomographic maps and 3D configurations of an ultrasonic standing wave field are measured according to the filtered-backprojection algorithm. The comparison between experimental and simulation results is provided to certify the feasibility and reliability of the proposed method.