1. The temperature and humidity sensor will drift during use, which is impossible to avoid.
2. The fundamental reason for the drift is that all pressure sensors are based on the elastic deformation of a material, no matter how outstanding the elasticity of the raw material is, after each elastic recovery, there will always be a certain elastic fatigue.
3. In the process of using temperature and humidity sensors, the drift caused by elastic data varies according to different raw materials, but as long as it is a qualified product, it is on a small scale.
4. In addition to the drift caused by the data, there is also a more obvious drift, that is, temperature drift (referred to as temperature drift). Temperature drift generally refers to the change of transistor parameters when the ambient temperature changes, which will cause the instability of the static operation point, the instability of the dynamic parameters of the circuit, and even the failure of the circuit to operate normally. In the amplification circuit, any parameter changes, such as the fluctuation of the supply voltage, the aging of the components, and the changes in the parameters of the semiconductor components with the change of temperature. will produce a drift of the output voltage.
5. In addition to the drift of the above factors, the drift factors of temperature and humidity sensors also depend on the design of the circuit and the quality of the components.
6. If the temperature and humidity sensor is used for a long time, it rarely shows drift, and if it is left for a long time, the probability of temperature drift is relatively large.
So how to deal with the error caused by the offset of the temperature and humidity sensor?
In the temperature and humidity sensor, the output signal will drift with the change of temperature under other conditions, in order to reduce this phenomenon, we adopt a certain algorithm to correct the output result, so as to achieve the intention of eliminating the influence of temperature change on the output signal within a certain scale. This method is called temperature compensation of temperature and humidity sensors, or "temperature compensation" for short. At present, most temperature and humidity sensors are equipped with temperature compensation to ensure the accuracy of the temperature and humidity scale to ensure the accuracy of temperature and humidity sensor monitoring.
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