Temperature and humidity sensors are widely used in many fields, and their accuracy is significantly affected by a variety of environmental factors.
First of all, the temperature change range has a greater impact on the accuracy of the temperature humidity sensor. In extreme high or low temperature environments, the characteristics of the sensitive components inside the sensor may change. For example, the capacitance value of some capacitive temperature humidity sensors will change non-linearly with temperature. After exceeding the appropriate temperature range, this change will lead to an increase in the deviation of humidity measurement. Moreover, high temperatures may degrade the performance of the sensor's packaging material, affecting its sensing and transmission of humidity, thus reducing the overall measurement accuracy.
Secondly, the humidity level itself is also a key factor. In a high-humidity environment, moisture may condense on the sensor surface, interfering with the normal operation of the sensor. For sensors that rely on changes in resistance to measure humidity, condensation may change the relationship between resistance and humidity, causing inaccurate measurement values. In addition, microorganisms may breed or chemical reactions may occur in high-humidity environments, corroding the metal parts of the sensor or affecting its insulation performance, thereby damaging accuracy.
Fluctuations in atmospheric pressure cannot be ignored. When the atmospheric pressure changes, the density and heat conduction characteristics of the air change accordingly, which will have an indirect impact on the measurement of the temperature humidity sensor. Especially in some meteorological observations or aerospace applications that require extremely high accuracy, changes in atmospheric pressure may cause significant errors in temperature and humidity measurements, because the sensors are usually calibrated at standard atmospheric pressure. When the air pressure deviates from the standard value, its measurement Accuracy will be challenged.
The presence of dust and contaminants has a significant impact on accuracy. Dust particles may adhere to the sensing surface of the sensor, blocking the normal adsorption and diffusion of humidity, making the sensor unable to accurately sense the true humidity of the surrounding environment. For temperature measurement, dust accumulation may affect the transfer and exchange of heat, causing deviations in temperature measurements. For example, in dusty environments such as industrial production workshops, temperature humidity sensors require regular cleaning and maintenance to ensure accuracy.
Electromagnetic interference environments can also reduce sensor accuracy. Strong electric fields or magnetic fields may interfere with the circuit signal transmission and processing inside the sensor, causing abnormal fluctuations in measurement data. In areas where some electronic equipment is densely packed or near high-voltage power facilities, the temperature humidity sensor is susceptible to electromagnetic interference, and its output signal may be superimposed with noise, thus affecting the accurate measurement and judgment of temperature and humidity.
In addition, light intensity has an impact in some cases. For some temperature humidity sensors based on optical principles, excessive illumination may change the light propagation and absorption characteristics inside the sensor, thereby affecting the measurement results of humidity and temperature. Especially in outdoor environments exposed to direct sunlight or strong light, this effect may be more obvious.
The accuracy of the temperature humidity sensor is comprehensively affected by various environmental factors such as temperature, humidity, atmospheric pressure, dust, electromagnetic interference, and light intensity. In practical applications, these factors must be fully considered and corresponding measures must be taken to ensure its measurement accuracy.
