To carry out a specific measurement work, the first thing to consider is what principle of inclination sensor to use, which requires analyzing multiple factors before determining. Because even when measuring the same physical quantity, there are multiple principles of tilt sensors available for selection. Which principle of tilt sensor is more suitable depends on the characteristics of the measured object and the usage conditions of the tilt sensor, taking into account the following specific issues: range size; The requirement for the volume of the tilt sensor at the measured position; Is the measurement method contact or non-contact; The method of signal extraction, wired or non-contact measurement; The source of the tilt sensor, whether it is domestically produced or imported, and whether the price is affordable, etc. After considering the above issues, it is possible to determine which type of sensor to choose, and then consider the specific performance indicators of the sensor. The following performance indicators are the main considerations:
1. Sensitivity
Usually, within the linear range of the tilt sensor, it is desirable for the sensitivity of the tilt sensor to be higher. Because only when the sensitivity is high, the value of the output signal corresponding to the measured angle change is relatively large, which is beneficial for signal processing. However, it should be noted that the sensitivity of the sensor is high, and external noise unrelated to the measured object is also easily mixed in, which can be amplified by the amplification system and affect the measurement accuracy. Therefore, it is required that the sensor itself should have a high signal-to-noise ratio and minimize the interference signals introduced from the outside.
The sensitivity of sensors is directional. When the measured quantity is unidirectional and requires high directionality, sensors with lower sensitivity in other directions should be selected; If the measured vector is multidimensional, the smaller the cross sensitivity of the sensor, the better. Of course, this is just a general requirement. Wuxi Huilian Information Technology Co., Ltd. adopts a special cross sensitivity suppression method to eliminate the influence of cross sensitivity.
2. Frequency response characteristics
The frequency response characteristics of sensors determine the frequency range being measured, and it is necessary to maintain measurement conditions without distortion within the allowable frequency range. In fact, the response of sensors always has a certain delay, and it is hoped that the shorter the delay time, the better.
The frequency response of sensors is high, and the frequency range of measurable signals is wide. However, due to the influence of structural characteristics, the inertia of mechanical systems is large, and sensors with low frequencies can measure signals with lower frequencies.
In dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady state, transient, random, etc.) to avoid frequency errors.
3. Linear range
The linear range of a sensor refers to the range where the output is proportional to the input. In theory, sensitivity remains constant within this range. The wider the linear range of the sensor, the larger its range and can ensure a certain measurement accuracy. When choosing a sensor, after determining the type of sensor, the first thing to consider is whether its range meets the requirements. However, in reality, no sensor can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, sensors with small nonlinear errors can be approximated as linear within a certain range, which will bring great convenience to the measurement.
4. Stability
The ability of a sensor to maintain its performance unchanged after a period of use is called stability. The factors that affect the long-term stability of sensors are not only the structure of the sensor itself, but also the usage environment of the sensor. Therefore, in order for sensors to have good stability, they must have strong environmental adaptability. Before selecting a sensor, it is necessary to investigate its usage environment and choose the appropriate sensor based on the specific usage environment, or take appropriate measures to reduce the impact of the environment. The stability of sensors has quantitative indicators, and after exceeding their service life, they should be recalibrated before use to determine their performance.
