Selection of sensitivity
In general, within the linear scale of the sensor, the higher the sensitivity of the sensor, the better. Because as long as the sensitivity is high, the value of the output signal corresponding to the change to be measured is relatively large, which is conducive to signal processing. However, it should be noted that the sensitivity of the sensor is high, and the external noise that is not related to the measurement is also simply mixed, which will also be expanded by the expansion system, which will affect the measurement accuracy. Therefore, the sensor itself should have a high signal-to-noise ratio to reduce the factory disturbance signal imported from the outside world. The sensitivity of the sensor is directional. When the measured quantity is a one-vector quantity and has high requirements for its directionality, the sensor with small sensitivity in other directions should be selected. If the measured is a multi-dimensional vector, the sensitivity of the sensor is required to be as small as possible.
Frequency response
The frequency response characteristics of the sensor determine the frequency scale to be measured, and it is necessary to adhere to the measurement condition without distortion within the promised frequency scale, in fact, 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 scale of the measurable signal is wide, while due to the influence of structural characteristics, the inertia of the mechanical system is larger, and the frequency of the measurable signal of the sensor with low frequency is low. In dynamic measurement, the response characteristics of the signal (steady-state, transient, random, etc.) should be based on the characteristics of the signal to avoid over-fire errors.
Linear Scale – The linear scale of a sensor refers to the scale at which the output is proportional to the input. Theoretically, the sensitivity sticks to a fixed value at this scale. The wider the linear scale of the sensor, the greater its measuring range and the guaranteed measurement accuracy. When selecting a sensor, when the variety of the sensor is determined, the first thing to see is whether its range meets the requirements. But in reality, no sensor can guarantee a certain linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, within a certain scale, the sensor with small nonlinear error can be approximately regarded as linear, which will bring great convenience to the measurement.
Stability
After a period of use, the function of the sensor does not change in order to be called stability. In addition to the structure of the sensor itself, the factors that affect the long-term stability of the sensor are mainly the operating environment of the sensor. Therefore, in order for the sensor to have outstanding stability, the sensor must have strong environmental adaptability.
precision
Accuracy is an important functional goal of the sensor, and it is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive its price, therefore, the accuracy of the sensor as long as it meets the accuracy requirements of the entire measurement system, and does not have to be too high. This makes it possible to choose a relatively inexpensive and simple sensor among many sensors that are satisfied with the same measurement intent. If the measurement intention is qualitative analysis, it is sufficient to choose a sensor with high repeatability, and it is not appropriate to choose a sensor with high accuracy of positive value; If it is necessary to obtain accurate measurements for quantitative analysis, it is necessary to select a sensor with an accuracy level that satisfies the requirements.
Use attention: Before selecting a sensor, the environment in which it is used should be investigated, and the appropriate sensor should be selected according to the specific application environment, or appropriate methods should be taken to reduce the impact of the environment. Anhui SECCO environmental protection technology sensor has a quantitative goal, beyond the use period, in the use of the re-calibration should be re-calibrated before use, to determine whether the function of the sensor has changed. In some situations where the sensor is required to be used for a long time and cannot be easily replaced or calibrated, the safety requirements of the selected sensor are more stringent, and it must be able to withstand long-term detection. For some special applications, if a suitable sensor cannot be selected, it is necessary to design and manufacture the sensor by itself. The function of the self-denial sensor should be satisfactory to the application requirements.
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