The temperature compensation (TC) method enables SENSORADE sensors to give a pressure measure that is compensated by the temperature. Indeed, the pressure sensor is a wheastone bridge (see Figure 1) where the outpout voltage (Vout span = Vout+ – Vout-) represents the level of pressure and the resistance of the bridge (R = (R1+R2) * (R3+R4)/(R1+R2+R3+R4)) represents the level of temperature.
To access this information, we make various measurements of the voltage’s output using the information provided by the deformation of the membrane. The latter deforms all the 4 resistances at the same time and therefore their values change at the image of the deformation of the membrane, as illustrated in Figure 2. The measure is made in known conditions of pressure and temperature (in a fixed range of temperature – from a minimum to a maximum value).
The objective of this tutorial is to present the possible strategy for measuring and or compensate the effect of the temperature. The following is an overview of the 4 possible options that can be done at your facilities*: