According to the different working modes of each component of the sensor, the sensor can be divided into different types; according to different receiving modes, there are relative and absolute (inertial) types; according to different electromechanical conversion outputs, there are two types: generator type and parameter type. The measuring circuit can output different relational characteristics to meet different test requirements. Such as displacement (gap) voltage characteristics, velocity voltage characteristics, acceleration voltage characteristics, etc. The so-called relative receiving mode refers to a working mode that uses the sensor housing as a reference coordinate to directly receive the mechanical vibration amount by means of changes in the push rod or gap. The result obtained is the relative vibration value with the housing as the reference coordinate. The inertial receiving mode receives the measured vibration amount through the mass-spring single-degree-of-freedom vibration system. When working, its housing is fixed on the vibrating object, and the entire sensor (including the mass block) vibrates with the vibrating object. However, the electromechanical conversion link-the coil is fixed on the housing with an extremely soft spring sheet, and its natural frequency is much lower than the vibration frequency of the vibrating body, so it is in a relatively static state with respect to the vibrating body. In other words, the coil is fixed and is an absolute reference coordinate system, so the measured result is the absolute vibration value. The inertial reception method is sometimes also called seismic.
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