The causes of sensor drift and temperature drift and solution

Sensor has zero drift and temperature drift, these two kinds of drift very impact sensor measurement accuracy, how to solve these two kinds of drift is very important.

due to the asymmetric sensor element parameters in bridge road itself; Elastic element and a sensitive grid material temperature coefficient of resistance strain gage, different linear expansion coefficient, comprehensive factors such as set of bridge leads to inconsistent, resulting in overall temperature coefficient of sensor after the bridge adjacent arm has a certain difference, when the temperature changes, the adjacent arm resistance variation is different, so that the bridge output is not balance, namely the zero drift; For smart linear displacement sensor, encoder, electronic scale, import displacement sensor, the drift - — For the system, with the increase of time, is equivalent to the aging of the system for processing, in this way, the structure characteristics of the system is about to change, resulting in a drift. Temperature drift - — Affected by the temperature instability caused by zero. Visible, the influence of temperature is the main factor in the production of zero drift, is also the most difficult to control.

solve sensor temperature drift generally there are two kinds of methods, hardware and software. Hardware method is appropriate constant in series and parallel bridge arm resistance method, bridge arm thermistor compensation method, bridge outside the thermistor in series, in parallel compensation method, double bridge compensation technology, triode compensation technique, etc. A software methodology is eliminated by software program migration, this method corresponding digital output of the sensor is very practical, customers can themselves by writing software to realize, or is the sensor with digital display table when can also be done by regulating digital display table. Is very convenient.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor