Ball spin rate measurement
US9868044B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2016 |
| Grant date | Jan 16, 2018 |
| Priority date | — |
| Expiry date | Jul 14, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2225/52
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
Systems and methods for ball spin rate measurement are described. Some embodiments provide a method whereby a phase-demodulated difference signal of a projectile in flight is received, such as from a Doppler radar system. A first periodic component of the phase-demodulated signal is detected, the first periodic component having a plurality of bipolar pulses, with each of the pulses having a first portion during which an apparent speed of the projectile is greater than a nominal speed of the projectile, and each of the pulses having a second portion during which the apparent speed of the projectile is less that the nominal speed of the projectile. A period of the first periodic component is detected, and the spin rate of the projectile in flight is determined based on the period of the first periodic component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.