Spectrometry and optical method and apparatus for obtaining a stable spectrum with use of an informationless spectrum contained therein
US5751418A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 10, 1996 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | May 10, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/314
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an optical measuring apparatus of the present invention, a spectroscopic optical system emits a measuring light beam that contains a measure light component of a measure wavelength domain where a measured object absorbs part of the light and a reference light component of a reference wavelength domain where the measured object almost completely absorbs the light, and separates the beam into beams, a photometric unit measures the light incident on an integrating sphere when a reference sample is inserted in the light path and stores the measurements in a memory and also measures the light incident on an integrating sphere when a measured object is inserted in the light path, and an arithmetic circuit calculates a light intensity ratio of the compensation light component for the measured object to the compensation light component stored in memory and then estimates background intensities during the measurement by multiplying the measurements stored in the memory by the intensity ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.