Apparatus and process for measuring physical parameters of sheet material
US4766315A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1986 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Jul 14, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/8618
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and process for measuring physical parameters of sheet material via infrared absorption phenomena is disclosed. The invention employs an integral filter-detector package comprising at least two optical filter-detector combinations. The package is contained within a conventional sensor housing which traverses back and forth across the sheet material. The package may comprise an additional filter-detector combination that is selected to produce a detector response having a significantly higher signal-to-noise ratio than the response of remaining detectors. The former response is used in combination with synchronous detectors to provide a reference of the general shape and phase of the latter responses in the absence of high noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.