Radiation thermometer
US5001657A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1989 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Dec 6, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/80
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radiation thermometer has a detector for receiving radiation energy from a target object, and the detector generates an AC signal as a result of movement of a chopper. The AC signal is rectified by a rectifying circuit and the rectified signal is supplied to a microcomputer. On the other hand, temperatures around the detector are detected by a temperature sensor and the temperature of the target object is measured based on those detected values. In addition, the radiation thermometer has various calibration modes other than a measurement mode. In a calibration mode I, calibration data concerning a difference in characteristics of the temperature sensor for each thermometer is obtained. Data for correcting timing for synchronous rectification by the rectifying circuit is obtained in a calibration mode II. Calibration data for calculation of the temperature of the target object is obtained in a calibration mode III. Those calibration data are temporarily stored in a non-volatile RAM so that the temperature of the target object can be calculated by using those calibration data when the measurement mode is selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.