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Calibration fixture and method of calibrating contact sensors

  • US 5,131,259 A
  • Filed: 02/01/1991
  • Issued: 07/21/1992
  • Est. Priority Date: 02/01/1991
  • Status: Expired due to Term
First Claim
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1. A calibration fixture for a contact sensor comprising a first backing sheet having a first plurality of electrodes, a second backing sheet having a second plurality of electrodes confronting said first plurality and being disposed in a crossing pattern to define a plurality of intersections, and resistive material between the electrodes at each intersection to electrically isolate the confronting electrodes at each intersection, said contact sensor providing a variable output representative of the applied force at each intersection as force is applied thereto, and conductors for each of the electrodes terminating in remote contacts from which readings are taken, said fixture comprisinga first plate against which said contact sensor is supported,a second plate confronting said first plate and spaced therefrom,an annular sealing member supported on said second plate,a bladder disposed between said sealing member and said second plate to define a fluid pressure chamber circumscribed by said sealing member,a frame assembly for holding said first and second plates in their confronting relationship, anda pressurized fluid entry passage extending through said second plate and communicating with said pressure chamber,whereby when a contact sensor is disposed between said bladder and said first plate and the pressure chamber is pressurized, a uniform force is applied to each electrode intersection circumscribed by said annular sealing member.

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