Semi-constant power circuit for use with a thermal radiation source
US6023069A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Oct 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/108
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A power circuit for use with a resistive thermal radiation source in which the power delivered to the resistive thermal radiation source will remain constant within a preselected deviation over a fixed period of time as the source resistance of the source varies between an initial source resistance and a second source resistance at the operating temperature. The power circuit is designed to maintain constant power within a preselected deviation by using the resistance of the resistive thermal radiation source to calculate a preselected resistance used in the power circuit according to the following equation: ##EQU1## wherein .DELTA.P=P.sub.si -P.sub.s ; P.sub.si =the initial power on the resistive thermal radiation source; P.sub.s =the power on the resistive thermal radiation source when the source resistance is equal to the second source resistance; K.sub.1 =RO/R.sub.si ; R0=the preselected resistance; R.sub.si =the initial source resistance; K.sub.2 =R.sub.s /R.sub.si ; and R.sub.s =the second source resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.