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 to decide. After all, even for the same physical quantity, there are multiple principle-based sensors available. The suitability of a particular principle depends on the characteristics of the measurement and the sensor's operating conditions. Consider the following specific issues: the range size; the sensor volume requirement at the measurement location; whether the measurement is contact or non-contact; the signal extraction method, wired or non-contact measurement; the source of the sensor, domestic or imported, affordability, or self-developed. 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 a sensor, the higher the sensitivity, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is large, which is beneficial for signal processing. However, it is important to note that a highly sensitive sensor is also prone to picking up external noise unrelated to the measurement, which can be amplified by the system and affect measurement accuracy. Therefore, it is required that the sensor itself have a high signal-to-noise ratio and minimize interference signals introduced from the outside. The sensitivity of a sensor is directional. When the measured quantity is a single vector and high directional requirements are placed on it, 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.