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
DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 Sensor Selection

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DESIGN OF ENGINEERING SYSTEMS I March 24, 2011 Stimulus
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:
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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