The principle and structure of different types of intelligent sensors are very different, in use, the first problem to solve is how to reasonably select the sensor according to the specific measurement purpose, measurement object and environment. Secondly, after determining the sensor, you can also determine its matching measurement method and measuring equipment, after all, the success of the measurement results depends largely on the choice of the sensor, the following industrial procurement network from the following aspects to say specifically about the selection of the sensor!
1. Measurement object and measurement environment
To make a specific measurement, we must first consider which sensor to use. Before deciding, many factors need to be analyzed. Because even when measuring the same physical quantity, there are multiple principles of sensors to choose from, which one is more suitable, you need to consider issues based on the characteristics of the measurement and the conditions of use of the sensor, such as: the size of the range, the requirements of the measurement location for the volume of the sensor, the measurement method is contact or non-contact, signal extraction and other issues. After considering the above issues, we can determine which type of sensor to choose, and then consider the specific performance indicators of the sensor.
2. The sensor frequency response
The frequency response characteristics of the hardware sensor determines the frequency range to be measured. It must be in the allowable frequency range to maintain undistorted measurement conditions. In fact, the response of the sensor always has a fixed delay, the shorter the delay time the better. With a high frequency response of the sensor, the frequency range of the measurable signal is correspondingly wider. Due to the influence of structural characteristics, mechanical systems with high inertia and low frequency sensors have a low frequency of measurable signals. In the dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady state, transient, random, etc.) to avoid excessive errors.
3. The choice of sensor sensitivity
Usually, within the linear range of the sensor, 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 signal processing. However, it should be noted that the high sensitivity of the sensor, external noise unrelated to the measurement is also easy to mix in, thus affecting the measurement accuracy. Therefore, the sensor itself is required to have a high signal-to-noise ratio to reduce the interference signal introduced from the outside.
4. Sensor stability
Sensor performance after using a period of time thrown to maintain the same ability is called stability. In addition to the structure of the sensor itself, the factors affecting the long-term stability of the sensor is also mainly the use of the sensor environment. Therefore, in order to make the sensor has good stability, the sensor must have a strong environmental adaptability.
