Ambient temperature micro-bolometer control, calibration, and operation
US6267501A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1999 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Apr 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for measuring the temperature of a scene using a detector having at least one reference pixel, with an integratable sampling circuit associated with each pixel. Initially, an ambient reference temperature is observed with the reference pixel(s) to provide a parameter, generally voltage, indicative of that temperature to provide a constant voltage output indicating that temperature by varying the sampling circuit integration time. Each non-reference pixel is exposed to different scene and ambient temperatures and the integration time for each set of data for each pixel is recorded. For each pixel, an equation is provided relating integration time to pixel voltage when the ambient temperature and the scene temperature are the same to correct for offsets and an equation is provided relating integration time and offset corrected pixel value to the difference between the ambient temperature and the scene temperature when the ambient temperature and scene temperature differ for correction of responsivity. An equation is provided relating integration time to ambient temperature for calculating ambient temperature. The voltage level for each of the pixels and the integration is de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.