DYNAMIC METHOD OF MEASURING VIBRATION ACCELERATION AND SENSOR FOR ITS IMPLEMENTATION Russian patent published in 2025 - IPC G01M7/02 

FIELD: test equipment.

SUBSTANCE: invention relates to means of indication and control of linear vibration accelerations, and can be used in devices and systems of vibroacoustic diagnostics. Vibration acceleration measurements are carried out relative to an artificial fixed reference system, in the capacity of which an inertial element is used, fixed on an elastic suspension relative to the controlled object, variable physical fields are created by the excitation elements, which act on the windings of the measuring coils, initiating in them the corresponding physical effect, which is manifested in the occurrence of the corresponding EMF on the windings of these coils, and determining their difference, which is proportional to the acceleration of the controlled object. Excitation elements used are metal electrodes, by means of which alternating physical fields are created in the form of alternating electric fields, which act on the lower row of turns of electric windings of measuring coils. Appropriate variable magnetic fields are created in the surrounding space, by acting on an inertial element from a non-magnetic material with high electrical conductivity, the eddy current effect is initiated in it, which is manifested in the appearance of a re-emitted alternating magnetic field, which acts on measuring coils and induces in their windings corresponding EMF of mutual induction, determining the difference value between them, selecting the reactive component of this difference value, which is proportional to the value of the relative displacement of the controlled object and the inertial element, and the controlled object movement acceleration is calculated in the absolute coordinate system by the formula. Sensor comprises a housing made of magnetic material and a movable inertial element installed inside the housing and supported by an elastic suspension in the form of a flat spring fixed on the housing, first and second excitation elements, first and second measuring coils, which are fixed relative to the controlled object, the windings of which have anti-serial connection. Excitation elements and measuring coils are installed inside the magnetic housing coaxially with respect to the movable inertial element. Inside the housing along its longitudinal axis there is a central rod made of magnetic material, on the entire length of which a thin-walled dielectric cylindrical bushing is coaxially located, on the outer surface of which the first and second measuring coils are coaxially installed, movable inertial element is made in the form of a ring from material with high electroconductivity, which is located coaxially and symmetrically relative to measuring coils in their external space.

EFFECT: simpler design and higher accuracy of measurements, higher sensitivity and noise immunity.

5 cl, 5 dwg