Sensors and Transducers
In this book Ian Sinclair provides the practical knowhow required by technician engineers, systems designers and students. The focus is firmly on understanding the technologies and their different applications, not a mathematical approach. The result is a highly readable text which provides a unique introduction to the selection and application of sensors, transducers and switches, and a grounding in the practicalities of designing with these devices.
The devices covered encompass heat, light and motion, environmental sensing, sensing in industrial control, and signal-carrying and non-signal switches.
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Chapter 3 Light and associated radiation
Chapter 4 Temperature sensors and thermal transducers
Chapter 5 Sound infransound and ultrasound
Chapter 6 Solids liquids and gases
Chapter 7 Environmental senssors
Chapter 8 Other sensing methods
aˇected acceleration action aerial amount ampli˘er amplitude analogue applications beam bridge circuit cable capacitance capacitor cause cell circuit coil connected contact resistance crystal D^A converter detect detector device diˇerence di¤cult diaphragm diode display distance eˇect e¤ciency electrical electronic energy example frequency gases gure humidity hysteresis illustrated in Figure impedance inductive input ionization light linear liquid loudspeaker magnetic eld material maximum measured mechanical metal methods microphone microswitch needed normal op-amp operating optical opto-isolator oscillator output photocathode photocell photodiode piezoelectric plate polarizing position potentiometer pressure principle problem pulse quantity radiation range reŁected reed switch relay resistor resonant rotation sampling semiconductor sensing sensitivity sensor signal slew rate sound wave speci˘ed speed strain gauge supply switch contacts temperature thermistor thermocouple thyristor transducer transistor tube typical ultrasonic unit usually velocity vibration voltage wavelength wire
Page x - A transducer is a device that converts energy from one form into another...
Page 17 - The positive gas ions are then attracted to a negatively charged electrode, and the amount of current carried by these ions is measured. Since the number of ions per unit volume depends on the number of atoms per unit volume, and this latter figure depends on pressure, the reading of ion current should be reasonably proportional to gas pressure.
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