DEVICE FOR MEASURING SPECTRAL COMPOSITION OF SPECIFIC BUOYANCY SPORTS FLOORING Russian patent published in 2017 - IPC G01R15/00 

FIELD: measuring equipment.

SUBSTANCE: device is stated for measuring the spectral composition of the specific buoyancy sports flooring consisting of an aluminium tube sliding inside a metal rod, the bottom end of which ends as a tapered replaceable nozzle, and the upper one is press-fitted into the plate, to which an additional load is attached, characterised in that on the same plate acceleration sensor is still attached, which via coaxial cable is connected to the input of the spectrum analyzer, wherein the interchangeable RC-chains set the bandpass filters, and as the acceleration indicator to the output spectrum analyzer a voltmeter is connected. The measurements are carried out in the following way: a steel rod with a variable mass with an accelerometer mounted on its upper end falls onto the floor covering from the fixed height, and bounces off from it with a certain acceleration and an unknown frequency. To determine the frequency of the rod rebound, the sensor signal is passed through the spectrum analyzer with strip filters that are replaced by the RC-chains. If the frequency of the rod rebound coincides with the frequency of the bandpass filter, the acceleration of the rod will be maximum, and the required frequency of the rebound is determined therefrom.

EFFECT: increasing the accuracy of measuring the rebound frequency of the rod with specific gravity mk at its free fall on the floor covering.

1 dwg, 1 tbl