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 the principle of the sensor to be used, which requires analyzing various factors before a decision can be made. After all, even for the same physical quantity, there are multiple principle sensors available. Which principle is more suitable depends on the characteristics of the measured object and the sensor's operating conditions. Consider the following specific issues: the size of the measurement range; the volume requirements of the measured position 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

Generally, within the linear range of the sensor, a higher sensitivity is preferred. This is because only with high sensitivity does the output signal value correspond to the measured change, which is favorable for signal processing. However, it's important to note that high sensitivity in sensors also makes it easier for external noise unrelated to the measurement to mix in and be amplified by the system, affecting measurement accuracy. Therefore, sensors should inherently have a high signal-to-noise ratio and aim to minimize interference signals introduced from the outside. The sensitivity of sensors is directional. When the measured quantity is a single vector and has high directional requirements, a sensor with lower directional sensitivity should be chosen; if the measured quantity is a multi-dimensional vector, the smaller the cross-sensitivity of the sensor, the better.