Due to the wide range of sensor applications and the wide variety of applications, they are used in a variety of industries. Therefore, the selection of the vibration sensor for the vibration test is mainly described here. According to the measurement of vibration parameters, it can be divided into three categories: displacement sensors, speed sensors and acceleration sensors (also known as accelerometers). In general, the displacement sensor is suitable for low frequency measurement, the speed sensor is suitable for medium frequency measurement, and the acceleration sensor is suitable for medium and high frequency measurement. Because the acceleration sensor has the characteristics of mature production process, wide frequency response range, large dynamic range and convenient installation, it is the most widely used in vibration testing. Therefore, the selection of the acceleration sensor is mainly introduced here.
The main contents of this paper include:
1. Sensor classification;
2. Common types of accelerometers;
3. Selection indicators;
4. Selection principle.
Sensor classification
In this case, two categories are mainly introduced, one is active and passive, and the other is isolated and non-isolated.
An active sensor is a sensor that converts non-electric energy into electrical energy output, transforms only the energy itself, and does not convert the energy signal, also known as an energy conversion sensor or transducer. Therefore, such sensors require external energy source excitation, such as excitation voltage, to work properly. Due to the need for energy conversion, the sensor is internally packaged with electronic components, which causes noise during the measurement process. Such sensors are ICP type (also known as IEPE type) acceleration sensors, zero frequency acceleration sensors, and the like.
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