3-24-2011 v1

3-24-2011 v1 - Sensor A sensor is an element in a...

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DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 A sensor is an element in a measurement system that detects the magnitude of a physical parameter and changes it into a signal that can be processed by the system. A sensor is a device that receives a stimulus and responds with an electrical signal. Sensor Sensor Input Signal Output Signal
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DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 Sensors are a category of transducer , a generic term which applies to devices that transform energy from one form to another. Actuators are also transducers. Sensor Actuators Sensors Electrical Input Physical Input Physical Input Electrical Input
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DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 Sensor Selection
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DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 Stimulus
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DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 Transfer function : The functional relationship between the physical input signal (the measured) and the electrical output signal. This may be expressed as a formula, or plotted as a graph. Sensor Performance Characteristics Two-dimensional transfer function of a thermal radiation sensor
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DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 Sensitivity : The relationship between input physical signal and output electrical signal. The sensitivity is often expressed as the ratio between a change in output signal to a given change in the input signal, i.e., the derivative of the transfer function with respect to the input physical signal. Sensor Performance Characteristics linear relationship S =a +bs where a is the intercept (i.e., the output signal at zero input signal) and b is the slope, sensitivity . nonlinear relationship, at a given s 0 Example: Sensitivity:
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March 24, 2011 Span/dynamic range/input full scale(FS) : The range of input physical signals which may be converted to electrical signals by the sensor. For the sensors with a very broad and nonlinear response characteristic, a dynamic range of the input stimuli is often expressed in decibels, which is a logarithmic measure of ratios of either power or force (voltage). Sensor Performance Characteristics
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3-24-2011 v1 - Sensor A sensor is an element in a...

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