Engineers, scientists, and technologists will find here, for the first time, a clear and comprehensive account of applications of ultrasonics in the field of process control. Using numerous examples of high-volume, low-cost applications, the author illustrates how the use of new transducer materials and designs, combined with microprocessor-based electronics, make technical and financial sense for concepts that only a few years ago might have been of interest only to academicians. Some of the important topics covered include coupling, acoustic isolation, transducer and sensor design, and signal detection in the presence of noise.

The tranducer as a circuit element. Interfacing considerations - bridges. Interfacing considerations - interference. Amplifiers and signal translation. Offseting and linearizing. Overall considerations. 2 interface-design examples. Thermoswitches and thermocouples. Resistance temperature detectors (RTDs). Thermistor interfacing. Semiconductor temperature transducers. Pressure-transducer interfacing. Force-transducer interfacing. Flowmeter interfacing. Interfacing level transducers. Application miscellany.