Based on the measurement object and environment

Determine the type of sensor based on the measurement object and environment. For a specific measurement task, first consider which principle of sensor to use, which requires analyzing various factors before a decision can be made. Since there are multiple principles of sensors available for the same physical quantity, the suitability of each principle depends on the characteristics of the measured item and the sensor's operating conditions. Consider the following specific issues: the range of measurement; the volume requirements of the measurement location for the sensor; whether the measurement is contact or non-contact; the method of signal extraction, wired or non-contact measurement; the origin of the sensor, domestic or imported, whether the price is affordable, or whether to develop it independently. After considering these issues, you can determine the type of sensor to use, and then consider the specific performance indicators of the sensor.

Selection of sensitivity

Typically, within the linear range of sensors, it's preferable to have a high sensitivity. This is because only with high sensitivity does the output signal's value correspond to the measured change, which is beneficial for signal processing. However, it's important to note that a high sensor sensitivity also allows external noise, unrelated to the measurement, to easily mix in and be amplified by the system, affecting measurement accuracy. Therefore, the sensor itself should have a high signal-to-noise ratio and aim to minimize interference signals introduced from the outside. Sensors have a directional sensitivity. When the measured quantity is a single vector and requires high directional sensitivity, it's advisable to choose a sensor with lower sensitivity in other directions. If the measured quantity is a multi-dimensional vector, the smaller the cross-sensitivity of the sensor, the better.