Sensitivity: Refers to the voltage signal output value u that can be obtained for the unit vibration input x along the measuring axis of the sensor, that is. With agility
An index related to the degree is the resolution, which refers to the output voltage change △u plus the minimum recognizable mechanical vibration input change
In order to measure small vibration changes, the sensor should have a higher sensitivity. When the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is beneficial to signal processing. The sensitivity of the sensor is high, and external noise that has nothing to do with the measurement is also easy to mix in, and it will also be amplified by the amplification system, which affects the measurement accuracy.
The sensitivity of the sensor is directional. When the measured is a single vector, and its directivity requirements are high, the sensor with less sensitivity in other directions should be selected; if the measured is a multi-dimensional vector, the smaller the cross-sensitivity of the sensor, the better.
Use frequency range: Refers to the frequency range where the magnitude of sensitivity changes with frequency does not exceed the given error. The two ends are the frequency lower limit and
Upper limit. In order to measure static mechanical quantities, the sensor should have a zero frequency response characteristic. The frequency range of the sensor, in addition to the sensor itself
In addition to the frequency response characteristics, it is also related to the sensor installation conditions (mainly affecting the upper frequency limit). The frequency response characteristic of the sensor determines the frequency range to be measured, and it must remain undistorted within the allowable frequency range. In fact, the response of the sensor always has a fixed delay, and it is hoped that the delay time is as short as possible. The higher the frequency response of the sensor, the wider the measurable signal frequency range.
Dynamic range: dynamic range can be measured range, which refers to the input mechanical quantity whose sensitivity change with amplitude does not exceed the given error limit
Amplitude range. In this range, the output voltage is proportional to the mechanical input, so it is also called the linear range. Dynamic range generally does not use absolute quantity
The value is expressed in decibels. This is because the measured vibration value changes too much. It is more convenient to use decibels.
Phase shift: refers to the phase lag of the output voltage signal with the same frequency relative to the input when the simple harmonic vibration is input. The existence of phase shift may make the output
The synthesized waveform produces turbulence. In order to avoid output distortion, the phase shift value is required to be zero or Π, or change in proportion to the frequency.