Spectrophotometers with digital processing
US4180327A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1977 |
| Grant date | Dec 25, 1979 |
| Priority date | — |
| Expiry date | Oct 20, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Monochromatic light emitted from a monochromator is split into two light beams. These light beams are detected by a photodetector and converted into corresponding electric signals after having been transmitted, respectively, through a sample to be analyzed and a reference placed in the respective beam paths. The signal corresponding to the light beam transmitted through the sample and the signal corresponding to the light beam transmitted through the reference are converted into digital signals which are subsequently stored in respective digital storages or memories. The signal corresponding to the light beam transmitted through the reference is compared with a value in a predetermined range. The resultant value is then converted into an analog signal for operating a sensitivity regulator thereby to adjust the sensitivity of the photodetector. Thus, the signal corresponding to the light beam transmitted through the reference (reference light signal) is so controlled as to lie in a predetermined range. From the digital signals stored in the digital memory, ratio between the sample light signal and the reference light signal is arithmetically calculated by a digital processor unit fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.