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Apparatus for accurately determining a moving ball's position and speed

  • US 5,602,638 A
  • Filed: 04/01/1994
  • Issued: 02/11/1997
  • Est. Priority Date: 04/01/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus for determining, as a minimum, the position and speed of a spherical projectile passing through an emitter/sensor matrix constructed in a single plane, comprising of:

  • a plurality of emitter/sensor pairs, constructed as a matrix in a single plane for producing signals dependent on projectile speed and the vertical and horizontal positions of the projectile as it passes through the matrix of emitter/sensor pairs,a cyclical clock circuit for intensity modulating light produced by said emitters, and sensor processing circuits, including a band-pass filter for separating the intensity modulated light signals from ambient light and interference,a processor for receiving data signals representative of the intensity modulated light received by the light sensors for calculating a projectile speed value when a minimum of two sensors paths, in either array of said matrix, have been blocked as the projectile passes through the matrix and for processing the data signals to calculate projectile horizonal and vertical positions when a minimum of two sensor paths, in each array of said matrix, have been blocked as the projectile passes though the array; and

    a display system remotely located from said collection box for displaying performance and statistical information about a single or collection of projectiles passing through the matrix.

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