Light amount measurement device and light amount measurement method
US7388660B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 1, 2006 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Dec 10, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for measuring the intensity of incoming light is disclosed. This device includes a rotatable light blocking unit which interrupts incident signal light at short regular intervals. The device also includes a light source which emits certain light different from the signal light while the signal light is interrupted by the block unit, and a measurement unit for measuring intensity values of the signal light and the certain light. A correction unit is provided for correcting the measured signal light intensity based on the certain light intensity. A calculator unit calculates a correction value through comparison of the intensity of the certain light to a reference value. The correction unit uses this correction value to correct the signal light intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.