Non-contact techniques for measuring temperature or radiation-heated objects
US5154512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1990 |
| Grant date | Oct 13, 1992 |
| Priority date | — |
| Expiry date | Apr 10, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/0818
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-contact pyrometric technique is provided for measuring the temperature and/or emissivity of an object that is being heated by electromagnetic radiation within the optical range. The measurement is made at short wavelengths for the best results. The measurement may be made at wavelengths within those of the heating optical radiation, and the resulting potential error from detecting heating radiation reflected from the object is avoided by one of two specific techniques. A first technique utilizes a mirror positioned between the heating lamps and the object, the mirror reflecting a narrow wavelength band of radiation in which the optical pyrometer detector operates. The second technique is to independently measure the a.c. ripple of the heating lamp radiation and subtract the background optical noise from the detected object signal in order to determine temperature and emissivity of the object. Both of these techniques can be combined, if desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.