What is the principle of modern temperature and humidity sensors? What are the characteristics?
June 16,2022
wireless temperature humidity sensor,remote temperature humidity sensor
Modern wireless temperature humidity sensors vary widely in principle and structure. How to select a temperature and humidity sensor reasonably according to the specific measurement purpose, measurement object and measurement environment is the first problem to be solved when measuring a certain quantity.
When the wireless temperature humidity sensor is determined, the corresponding measurement method and measurement equipment can also be determined. The success or failure of the measurement results depends to a large extent on whether the selection of temperature and humidity sensors is reasonable.
1. Frequency response characteristics:
The frequency response characteristic of the wireless temperature humidity sensor determines the frequency range to be measured, and the measurement condition must be maintained without distortion within the allowable frequency range. In fact, the response of the sensor always has a certain delay, and it is hoped that the shorter the delay time, the better. The frequency response of the sensor is high, the frequency range of the measurable signal is wide, and due to the influence of the structural characteristics, the inertia of the mechanical system is large, and the frequency of the measurable signal of the sensor with low frequency is low. In dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady-state, transient, random, etc.) to avoid excessive errors.
2. Linear range:
The linear range of the wireless temperature humidity sensor refers to the range where the output is proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the larger its range, and can guarantee a certain measurement accuracy. When choosing a wireless temperature humidity sensor, when the type of the sensor is determined, it first depends on whether its range meets the requirements.
3. Determine the type of sensor according to the measurement object and measurement environment:
To carry out a specific measurement work, we must first consider which principle of remote temperature humidity sensor to use, which can only be determined after analyzing various factors. Because, even for measuring the same physical quantity, there are remote temperature humidity sensors with various principles to choose from. Which principle sensor is more suitable, you need to consider the following specific issues according to the characteristics of the measured and the use conditions of the sensor: Range The size of the sensor; the requirements of the measured position on the sensor volume; the measurement method is contact or non-contact; the method of signal extraction, wired or non-contact measurement; the source of the remote temperature humidity sensor, domestic or imported, whether the price can bear it, or Self-developed.
4. Sensitivity selection:
Generally, within the linear range of the remote temperature humidity sensor, it is desirable to have the higher sensitivity of the sensor, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is beneficial to signal processing. However, it should be noted that the sensitivity of the sensor is high, and the external noise unrelated to the measurement is also easily mixed, and it will also be amplified by the amplification system, affecting the measurement accuracy. Therefore, it is required that the sensor itself should have a high signal-to-noise ratio to minimize the disturbance signal introduced from the outside world.
5. Accuracy:
Accuracy is an important performance indicator of remote temperature humidity sensor, and it is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive it is. Therefore, the accuracy of the sensor only needs to meet the accuracy requirements of the entire measurement system, and it is not necessary to select it too high. This makes it possible to choose a cheaper and simpler sensor among many sensors for the same measurement purpose.
6. Stability:
The ability of the remote temperature humidity sensor to remain unchanged after a period of use is called stability. In addition to the structure of the sensor itself, the factors affecting the long-term stability of the sensor are mainly the use environment of the sensor. Before selecting a sensor, the use environment should be investigated, and the appropriate sensor should be selected according to the specific use environment, or appropriate measures should be taken to reduce the impact of the environment. The stability of the sensor has quantitative indicators. After the period of use, it should be re-calibrated before use to determine whether the performance of the sensor has changed.
Wireless temperature humidity sensor, remote temperature humidity sensor The temperature and humidity sensor is widely used in various fields, especially in places that need to record changes in parameters such as temperature and humidity in real time.