Abstract
The analysis of vibroacoustic diagnostics systems was carried out. It was found that vibration acceleration sensors (accelerometers) from the class of electromagnetic transducers designed to measure low-frequency dynamic processes are of the greatest practical interest. A new version of a solenoid-type electrode inductive vibration acceleration sensor with an elastic suspension of an inertial element was proposed to measure low-frequency dynamic processes. A new vibration sensor design and its electrical equivalent circuit are presented as well as the operating principle of the vibration sensor. The sensor informative parameter, which is affected by external mechanical vibrations, is the insertion depth of the armature-plunger into the measuring coil cavity. To process the measurement information, a bridge circuit is used, and capacitive elements are used as auxiliary shoulder elements of this circuit, which are an integral design part of the sensor itself providing a high invariance level to destabilizing factors. In this case, the resonant excitation mode of the measuring coils is used, which ensures high sensitivity of the sensor as a whole. The analytical description of the main physical processes that determine the novelty of the considered technical solution was carried out. It is proposed to use an additional transformation of the information signal from the sensor in the form of quarter-phase detection by means of a synchronous detector.
Keywords
Vibration sensor, measuring coil, inertial element, elastic suspension, turn-to-turn capacitance of the winding, coupling capacitors of measuring coils with supply voltage, bridge measuring circuit, resonance, quarter-phase detection.
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