Instrumentation Transducers And Interfacing

-~- ~_vane \::y;) \ c:=::J ] 0=0 ] Dc:=JD Fig. 2. 39 Seven-segment devices for large displays and good visibility at up to 300 m can readily be obtained. Summary The number of transducer types is almost unlimited, and in order to bring our area of study down to a more manageable size we have considered transduc ers under four main headings. Input transducers for detecting mechanical change allow us to sense force, pressure, position, proximity, displacement, velocity, acceleration, vibration and shock in all their multiple manifestations. The basis of many mechanical sensors is the strain gauge which is usually used in a bridge configuration. Other devices such as the L VDT and synchro are also widely used. Temperature transducers form another large group, and we have looked at the operating principles of the major types, with some of the techniques used in compensating for non-ideal characteristics. Radiation and chemical sensing transducers form the remaining groups. Actuators rely almost entirely on electromagnetic action and, in modern equipment, occur most commonly as solenoids and relays, including the reed relay, and stepper motors. Visual displays also come in a bewildering range of types and sizes, but, because of their ease of interfacing with electronic circuitry, the majority are based on the LED and LCD. Review questions 1. What is meant by gauge factor? 2. Define Young's modulus. 3.

The first edition (1986) was titled Transducers and interfacing--principles and techniques. This revised and enlarged edition provides first and second year degree and certificate students in electronic engineering and related courses with a coherent treatment of the principles of, and techniques in, modern instrumentation. Annotation copyrighted by Book News, Inc., Portland, OR

The aim of this text is to provide an integrated account of the principles and properties of the most important types of physical transducer, whether analogue or digital. The treatment is primarily from the measured standpoint, so that, for example, the different types of length transducer are discussed and compared together in one chapter.

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.

Tony Fischer-Cripps is a Project Leader in the Division of Telecommunications and Industrial Physics of the CSIRO (Commonwealth Scientific & Industrial Research Organisation), Australia. He was previously lecturer, University of Technology, Sydney (UTS), Australia, and has also worked for the National Institute of Standards and Technology, USA (NIST, formerly National Bureau of Standards - NBS). *The essential pocket reference for engineers and students *Interfacing in action: PCs, PLCs, transducers and instrumentation in one book *Develop systems and applications that work with Newnes Interfacing Companion

Comprehensive reference providing detailed treatment of sensors ranging from simple thermistors to strain gauges, electro-optics, and medical laboratory sensors. Practical application and interfacing to both analog and digital circuits are included. Covers the latest analog-to-digital converters for sensor interfacing to computers and interfacing sensors to the IBM-PC series computers. Also delivers a wealth of vital application examples. Intended for practical design of instrumentation devices. KEY FEATURES: - provides grounding, shielding, and interference reduction strategies. - includes in-depth coverage of noise and its effects on sensor signal processing. - covers DC power supply and excitation sources for sensors.

This volume thoroughly explores all the principles and techniques necessary for connecting any type of sensor to the IBM PC or equivalent computers -- e.g., sensors, transducers, data conversion, and interface techniques.