System and process for measuring and correcting the values of a parameter of a sheet material
AssigneeMeasurex Corporation
InventorsJohn Dahlquist, John Goss, Gunnar Wennerberg
Life of this patent
Estimating the term…
Abstract
A system for measuring the values of a parameter of a sheet of material is provided. The system includes a head system with sensors mounted therein and a distance correction system to correct the measured parameter for variations in the distance between parts of the head system.
Claims17
A process for measuring the values of a parameter of a sheet of material at various points by a sensor system including a first head member and a second head member and for correcting the measured values of the parameter to account for variability of the separation of the head members from one another without determining the separation of either head member from the sheet, the process comprising;
- (a) measuring the values of the parameter with the sensor system without correction for variability of the separation of the head members from one another to provide uncorrected, measured values;
- (b) determining the separation of the head members from one another by transmitting a signal through the sheet but not determining the separation of the head members from the sheet;
- and,
- (c) correcting the uncorrected measured values according to the separation of the head members from one another, but not according to the separation of the head members from the sheet.
A system for measuring the values of a parameter of a sheet of material at various points by a sensor system including head means and for correcting the measured values of the parameter to account for variability of the separation of parts of the head means without measuring the distance from the sensor system to the sheet, the system comprising;
- (a) head means having a first part disposed on a first side of the sheet and a second part disposed on a second side of the sheet;
- (b) distance sensing means coupled to the head means to measure the distance between the two parts of the head means by transmitting a signal through the sheet;
- (c) sensor means coupled to the head means for measuring the values of a parameter of the sheet but not the distance between said sensor means and the sheet to produce uncorrected, measured values;
- (d) parameter determination means coupled to receive signals from the sensor means and from the distance sensing means for correcting the uncorrected, measured values according to the distance between said two parts of said head means but not according to the distance between the head means and the sheet.
Dependencies are inferred from the claim text.