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6 factors for selecting sensors

by:Kaidi Sensors     2022-09-27
How to choose the right sensor? 1. First, determine the type of sensor according to the measurement environment and the measurement object. Which principle sensor is used, even if it measures the same physical quantity, there are various principle sensors to choose from. Which principle sensor is more suitable, then the need to follow The characteristics of the measurand and the application of the sensor require consideration of the following specific issues: the size of the range; the requirements of the measured position on the volume of the sensor; the measurement method is contact or non-contact; the signal extraction method, contact or non-contact measurement; Whether the sensor is domestic or exported, price factors and so on. After the above problems are determined, which type of sensor to choose can be determined. 2. Factors such as frequency response The frequency response characteristics of the sensor determine the frequency range to be measured. It is necessary to adhere to the undistorted measurement requirements within the allowable frequency range. In fact, the response of the sensor always has a certain delay. It is hoped that the shorter the delay time, the better . The frequency response of the sensor is high, and the measurable signal frequency range is wide, and due to the influence of the structural characteristics, the inertia of the mechanical system is large, and the frequency of the measurable signal of the sensor with low frequency is low. In static measurement, the characteristics should be echoed according to the characteristics of the signal (steady-state, transient, random, etc.) to prevent excessive errors. 3. Selection of sensitivity Generally, in the linear field of the sensor, it is hoped that the higher the sensitivity of the sensor, the better. Because only when the sensitivity is high, the value of the input signal corresponding to the change of the measured quality is relatively large, which is beneficial to signal processing. However, it should be noted that the sensitivity of the sensor is high, and the external noise related to the measurement is easily mixed, which affects the measurement accuracy. The sensitivity of the sensor is non-directional. When the measurand is a single vector, and its directivity request is high, the sensor with low sensitivity in other directions should be selected; if the measurand is a multi-dimensional vector, the smaller the interleaving sensitivity of the requested sensor, the better. 4. Linear range The linear range of a sensor is the range in which the output is proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the larger its range, and can guarantee a certain measurement accuracy. When selecting a sensor, when the type of the sensor is determined, it first depends on whether its range meets the requirements. But in fact, the linearity that any sensor cannot guarantee, its linearity is also relative. When the required measurement accuracy is relatively low, within a certain range, the sensor with less nonlinear error can be approximately regarded as linear, which will bring great convenience to the measurement. 5. Accuracy requirements Accuracy is an important performance index 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 it is. Therefore, the accuracy of the sensor only needs to meet the accuracy requirements of the entire measurement system, and it is not necessary to select it too high. This makes it possible to choose a cheaper and simpler sensor among many sensors for the same measurement purpose. Accuracy is an important performance index of the sensor. If the purpose of measurement is qualitative analysis, the sensor with high repeatability can be selected, and it is not suitable to use the sensor with high precision; if the measurement value must be obtained for quantitative analysis, the accuracy must be selected. A sensor with a grade that meets the requirements. For some special occasions, if a suitable sensor cannot be selected, it is necessary to design and manufacture the sensor by itself. The performance of the self-made sensor should meet the requirements for use. 6. Stability The ability of a sensor to keep its performance unchanged after a period of use is called stability. In addition to the structure of the sensor itself, the factors affecting the long-term stability of the sensor are mainly the use environment of the sensor. Therefore, to make the sensor have good stability, the sensor must have strong environmental adaptability. Before selecting a sensor, the use environment should be investigated, and the appropriate sensor should be selected according to the specific use environment, or appropriate measures should be taken to reduce the impact of the environment. The stability of the sensor has quantitative indicators. After the period of use, it should be re-calibrated before use to determine whether the performance of the sensor has changed. In some occasions where the sensor is required to be used for a long time but cannot be easily replaced or calibrated, the selected sensor has stricter stability requirements and must be able to withstand the test of a long time.
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