selection of sensors (mechatronics)
TRANSCRIPT
Konstruktiotekniikka
Mechatronics Components and Instrumentation(MSc Course: EDE-31206)
Selection of Sensors
Mithun ChowdhuryTomáš Spáčil
16/11/2013
Konstruktiotekniikka
DESIGN PROCESS
Distinguish into 6 major phases• Conceptual design• Preliminary design• Detail design and development• Construction• Operation use• Retirement
Sensors are necessarily part of almost all phases
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REQUIREMENTS Summarizing possible future application of the system
Measurement principles• Environment• Size, weight
Sensing method• Resolution, range, frequency,...• Output• Cost
Best compromise
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SENSOR x TRANSDUCER
Sensor produce a signal relating to the physical quantity being measured.
Transducer converts one type of energy to another form of energy.• Transducer consists of a sensor and electronic circuit.• Output from of a transducer is normally voltage (V) or current (A).
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ROTATIONAL• Potentiometer• Resolvers• Magnetic / optical encoders• Capacitive encoders• Inductive encoders
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TEMPERATURE
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MAGNETIC• Hall sensor• Magnetoresistive sensor• Magnetodiode• Induction coil• SQUID
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Sensor Topology
Sensitivity Range Precision Resolution Accuracy Offset Linearity Hysteresis Response Time Dynamic Linearity
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Sensitivity• defined as the input parameter change required to produce a
standardized output change
Range• is the maximum and minimum values of applied parameter that can be
measured
Precision• refers to the degree of reproducibility of a measurement
Resolution• is the smallest detectable incremental change of input parameter that
can be detected in the output signal.
Sensor Topology
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Accuracy• maximum difference that will exist between the actual value (which
must be measured by a primary or good secondary standard) and the indicated value at the output of the sensor
Linearity• is an expression of the extent to which the actual measured curve of a
sensor departs from the ideal curve.
Response Time• Sensors do not change output state immediately when an input
parameter change occurs. Rather, it will change to the new state over a period of time, called the response time.
Sensor Topology
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Choose the Right Sensor for an Measurement System
Depend on Temperature Strain Sound Vibration Position and Displacement Pressure Force
Konstruktiotekniikka
Mechatronics Components and Instrumentation(MSc Course: EDE-31206)
Thanks for your attention!
Mithun ChowdhuryTomáš Spáčil
16/11/2013