Abstract
In distributed non-destructive testing (NDT), the acquisition of ultrasonic measurements occasionally has to be performed at different locations distant from the central station, where the ultrasonic data must be analysed and displayed. In this paper, the design details of an ultrasonic system with such objective are described. The system aims to perform remote acquisitions and transmit them to a central station using mobile telephony. Ultrasonic and telecommunication sub-systems involved in this system are described. The practical implementation here depicted combines own-designed modules with some low-cost commercial devices. Some design consideration and the block schemes of each subsystem are detailed. Finally, a laboratory prototype, developed for design viability purposes, is presented. This development includes stages for: transducer driving by means of a high-voltage pulse generator, broad-band amplification, acquisition, multiplexing and A/D conversion of signals, ultrasonic data transmission by mobile telephony, and the control of telemetering aspects by remote and local software.
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