Laser thickness gauge and method including passline angle correction
US9151595B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2014 |
| Grant date | Oct 6, 2015 |
| Priority date | — |
| Expiry date | Apr 18, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2210/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laser thickness gauge has three laser displacement sensors each transmitting a laser beam onto a target web. Two sensors are spaced along the web and face one surface of the web and the third sensor faces the opposite surface. The thickness of a web that is positioned along a passline plane between the sensor is measured even when the passline plane is not perpendicular to the beams of the sensors. A data processor computes the passline angle from the distance measurements communicated from the three sensors. During setup and calibration, data representing physical characteristics of the gauge are measured and stored and during operation are processed with currently measured data to generate correction factors that are used to correct thickness measurements determined from the three laser sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.