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Focus on Measurements, Measurement of Force
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Figure 151 Measurement system
quantity measured by the sensor (eg, temperature, ow rate) Other classi cations are also possible Table 151 presents a partial classi cation of sensors grouped according to the variable sensed; we do not claim that the table is complete, but we can safely state that most of the engineering measurements of interest to the reader are likely to fall in the categories listed in Table 151 Also included in the table are references to the Focus on Measurements boxes that describe sensors elsewhere in this book A sensor is usually accompanied by a set of speci cations that indicate its overall effectiveness in measuring the desired physical variable The following de nitions will help the reader understand sensor data sheets: Accuracy: Conformity of the measurement to the true value, usually in percent of full-scale reading Error: Difference between measurement and true value, usually in percent of full-scale reading Precision: Number of signi cant gures of the measurement Resolution: Smallest measurable increment Span: Linear operating range Range: The range of measurable values Linearity: Conformity to an ideal linear calibration curve, usually in percent of reading or of full-scale reading (whichever is greater) Motion and Dimensional Measurements The measurement of motion and dimension is perhaps the most commonly encountered engineering measurement Measurements of interest include absolute position, relative position (displacement), velocity, acceleration, and jerk (the derivative of acceleration) These can be either translational or rotational measurements; usually, the same principle can be applied to obtain both kinds of measurements These measurements are often based on changes in elementary properties, such as changes in the resistance of an element (eg, strain gauges, potentiometers), in an electric eld (eg, capacitive sensors), or in a magnetic eld (eg, inductive, variable-reluctance, or eddy current sensors) Other mechanisms may be based on special materials (eg, piezoelectric crystals), or on optical signals and imaging systems Table 151 lists several examples of dimensional and motion measurement that can be found in this book Force, Torque, and Pressure Measurements Another very common class of measurements is that of pressure and force, and the related measurement of torque Perhaps the single most common family of force and pressure transducers comprises those based on strain gauges (eg,
692 Table 151 Sensor classi cation Sensed variables Motion and dimensional variables
15
Electronic Instrumentation and Measurements
Sensors Resistive potentiometers Strain gauges Differential transformers (LVDTs) Variable-reluctance sensors Capacitive sensors
Focus on Measurements boxes Resistive Throttle Position Sensor ( 2) Resistance Strain Gauges, The Wheatstone Bridge, and Force Measurements ( 2) Linear Variable Differential Transformer (LVDT) ( 16) Magnetic Reluctance Position Sensor ( 16) Capacitive Displacement Transducer and Microphone ( 4); Peak Detector Circuit for Capacitive Displacement Transducer ( 8) Piezoelectric Sensor and Charge Ampli ers ( 12) Digital Position Encoders; Digital Measurement of Angular Position and Velocity ( 13) Seismic Transducer ( 16) Seismic Transducer ( 6) Resistance Strain Gauges, The Wheatstone Bridge, and Force Measurements ( 2) Piezoelectric Sensor and Charge Ampli ers ( 12) Capacitive Displacement Transducer and Microphone ( 4); Peak Detector Circuit for Capacitive Displacement Transducer ( 8) Hot-Wire Anemometer ( 15) Differential Pressure Sensor ( 15) Turbine Meters ( 15)
Piezoelectric sensors Electro-optical sensors Moving-coil transducers Seismic sensors Strain gauges Piezoelectric sensors Capacitive sensors
Force, torque, and pressure
Flow
Temperature
Pitot tube Hot-wire anemometer Differential pressure sensors Turbine meters Vortex shedding meters Ultrasonic sensors Electromagnetic sensors Imaging systems Thermocouples Resistance thermometers (RTDs) Semiconductor thermometers Radiation detectors Motion transducers Force transducers Differential-pressure measurement devices Semiconductor sensors Gas analysis equipment Solid-state gas sensors
Thermocouples ( 15) Resistance Thermometers (RTDs) ( 15) Diode Thermometer ( 8)
Liquid level
Humidity Chemical composition
load cells, diaphragm pressure transducers) Also very common are piezoelectric transducers Capacitive transducers again nd application in the measurement of pressure Table 151 indicates where the reader can nd examples of these measurements in this book
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