Abstract:  Ultrasonic process tomography has revealed many advantages and promising applications in industry process on-
line measurement and environmental monitoring. However, what still remains as a crucial problem in this technology is the
quick and synchronous acquisition of useful and sufficient experimental data,which play a key role in the mathematical inversion
and image reconstruction.This work presented a transmission-mode ultrasonic process tomography system consisting of a
sensor array with a higlrspecd data acquisition cardCDAQ)and signal processing devices with switching device. The sensor array
contains 16 ultrasonic transducers and each transducer can emit farrshaped beams with angle as lark as 150 de}recs. A personal
computer is used for recording experimental data and communicates with the other device as a host. By implementing a Lab
VIEW-based program it can synchronously acquire the real-time data of 16 channels of two DAQ cards at 12 bit resolution
where the multiple-channels switching device with microprogrammed control unit(MCU)is of utmost importance for real-time
measurements.Though the configuration of this system has feature of simple and easy operation,an experiment on Zcflon cyl
inder has demonstrated that it can work well in one transmitting and multi-receiving mode in which the attenuated ultrasonic
waves from the transmitting transducer can be received by other transducers simultaneously. More significantly, an accurate
cross-section image of the object under investigation can be reconstructed using the experimental data.