Non Linear Hysteresis Compensation Models in Temperature Transducer Calibration
Generalized Prandtl-Ishlinskii play operators linearize directional thermal hysteresis loops, cutting transducer calibration uncertainty from 90 mK down to 13 mK.
Platinum Resistance Thermometry
Temperature Measurement
High-accuracy temperature determination relies on the predictable change in electrical resistance of a pure metal as it undergoes temperature changes. Through this method, platinum resistance thermometry provides a highly stable and repeatable measurement over a wide temperature range. The linear relationship between resistance and temperature makes this technique the preferred choice for industrial and laboratory calibration systems.
It operates from cryogenic zones up to several hundred degrees Celsius.
Sensor Construction
The sensor element consists of a fine platinum wire or a thin film deposited on a ceramic substrate. This metal must be of high purity to ensure a consistent temperature coefficient of resistance. Protective sheaths and lead wires connect the element to the measuring bridge circuit.
Calibration Precision
Precision measurements require the use of standard resistance thermometers calibrated at defined fixed points of the International Temperature Scale of 1990. These fixed points, such as the triple point of water, provide absolute reference conditions. This process reduces measurement uncertainty to less than a thousandth of a degree.
Industrial Standard
International standards like IEC 60751 define the nominal resistance values and tolerance classes for these sensors. Compliance with these standards ensures interchangeability of sensors across different manufacturers and instrumentation platforms. The resistance values are typically measured at zero degrees Celsius to verify compliance.