Optical chopper for infrared thermometer
US4907895A · kind A · utility
45Cited by
14References
38Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Mar 31, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/0805
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The infrared thermometer optical chopper includes a planar shutter having infrared radiation transmissive and infrared reflective portions arranged on the shutter, and a mechanism for rotating the shutter sequentially through a series of stop positions in which the transmissive and reflective portions are sequentially aligned with the internal optics of the infrared thermometer. A mechanism is also preferably provided for sensing the positioning of the shutter at the stop positions, to determine whether the shutter stop position alignment is in an infrared radiation transmissive phase or in an infrared radiation reflective phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.