Temperature Measurement Systems
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12 Terms
Seebeck Voltage Creation
EMF generated at junction of dissimilar conductors under thermal gradient
Cold Junction Compensation
Requires reference temperature measurement at terminal block
Pt100 Standard
100 Q resistance at OOC using pure platinum wire.
Lead Wire Configurations
3-wire and 4-wire Wheatstone bridge connections cancel lead resistance.
NTC Thermistors
Steinhart-Hart Model
Silicon Bandgap ICs
Thermistors & IC Temperature Sensors
NTC Thermistors
Exponential resistance drop with increasing temperature.
Steinhart-Hart Model
High accuracy 3rd-order logarithmic calibration curve.
Silicon Bandgap ICs
Direct linear analog voltage output (10 mV/OC)
Stefan-Boltzmann Law
Emissivity Factors (E)
Non-Contact Radiation Pyrometry
Stefan-Boltzmann Law
Total radiated energy scales with fourth power of temperature.
Emissivity Factors (E)
Surface reflectance requires spectral emissivity adjustment.