Temperature Drift Characteristics of Pressure Sensor

Sensors are devices used to measure different physical and chemical parameters. Different types of sensors are used to measure different physical and chemical parameters. Pressure sensors made of the piezoresistive effect of semiconductor materials are called piezoresistive pressure sensors, also known as diffusion silicon pressure sensors. This kind of sensor must be in contact with the measured object in the process of use to obtain the results, so it is easy to be affected by the ambient temperature, resulting in the sensor output signal will produce temperature drift phenomenon. This is mainly due to the temperature sensitivity of the physical properties of semiconductor materials. Therefore, the design of temperature compensation for pressure sensor has always been a research hotspot.

Many software-based numerical algorithms are used for temperature compensation of pressure sensors. These software technologies usually use microcontroller or embedded host computer and other devices to achieve the scheme. With advances in IC technology, the cost of these processors has decreased significantly, but analog signal conditioning circuits using integrated chips are still cheaper. In addition, some numerical methods due to computational overload can cause significant measurement delays that are not allowed when the sensor is part of a closed-loop feedback control system. Some software approaches require the use of computers to implement, which is not desirable for low-cost solutions.

Pressure sensors are usually 4 resistors connected to wheatstone bridge, and the resistance of the increase of the two resistance butt, so that the maximum sensitivity of the bridge.

Through the theoretical analysis of the temperature drift characteristics of the pressure sensor, the output of the pressure sensor will be affected by temperature, compared with constant voltage and constant current power supply, the output of the pressure sensor under constant current power supply is less affected by temperature. The experimental results show that the designed compensation circuit can compensate the temperature drift of the sensor well, and ensure the effectiveness of the sensor in the high-precision environment, which has a certain reference significance for the temperature compensation of the sensor.

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