6 Characteristics of Modern Temperature and Humidity Sensors

Modern temperature and humidity sensors differ greatly in principle and structure. How to reasonably select temperature and humidity sensors 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 temperature and humidity sensor is determined, the matching measurement method and equipment can also be determined. The success or failure of the measurement results largely depends on whether the selection of temperature and humidity sensors is reasonable.

1. Frequency response characteristics:

The frequency response characteristic of the temperature and humidity sensor determines the measured frequency range, and the undistorted measurement conditions must be maintained within the allowable frequency range. The response of the sensor always has a certain delay, and the shorter the delay time, the better. The frequency response of the sensor is high, and the frequency range of the measurable signal is wide. Due to the influence of 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 (steady state, transient, random, etc.) should be based on the characteristics of the signal to avoid excessive errors.

1. Linear range:

The linear range of temperature and humidity sensors refers to the range in which the output is proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor is, the larger its range is, and certain measurement accuracy can be guaranteed. When selecting a sensor, when the type of sensor is determined, we should first see whether its range meets the requirements.

1. Determine the type of sensor according to the measurement object and measurement environment:

To carry out a specific measurement work, we must first consider the principle of the temperature and humidity sensor, which needs to analyze various factors before it can be determined. Because even when measuring the same physical quantity, there are many kinds of sensors with different principles to choose from. Which one is more suitable, we need to consider the following specific problems according to the characteristics of the measured and the conditions of the sensor: the size of the measuring range; Requirements of the measured position on the volume of the sensor; Whether the measurement method is contact or non-contact; Signal extraction method, wired or non-contact measurement; The source of the sensor, domestic or imported, whether the price is affordable, or self-developed.

1. Selection of sensitivity:

Generally, in the linear range of temperature and humidity sensors, the higher the 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 conducive to the signal to the process. However, it should be noted that the sensitivity of the sensor is high, and the external noise irrelevant to the measurement is easy to mix in, which 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 plant disturbance signal introduced from the outside.

1. Accuracy:

Accuracy is an important performance indicator of temperature and humidity sensors. It is an important link related to the measurement accuracy of the whole measurement system. The higher the accuracy of the sensor, the more expensive it is. Therefore, as long as the accuracy of the sensor meets the accuracy requirements of the whole measurement system, it is not necessary to choose too high. In this way, cheaper and simpler sensors can be selected from many sensors that meet the same measurement purpose.

1. Stability:

The ability of the temperature and humidity sensor to keep its performance unchanged after being used for some time is called stability. In addition to the structure of the sensor itself, the main factor affecting the long-term stability of the sensor is the operating environment of the sensor. Before selecting a sensor, its use environment should be investigated, and appropriate sensors should be selected according to the specific use environment, or appropriate measures should be taken to reduce the impact of the environment. There are quantitative indicators for the stability of the sensor. After exceeding the service life, it should be calibrated again before use to determine whether the performance of the sensor has changed.

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