Spectrophotometer
US4500205A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1983 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Feb 10, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/1232
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a spectrophotometer of double beam type comprising a radiation source, reference and sample cells, a photo detector, and beam path switching means, a current-voltage converting amplifier and a logarithmic amplifier in parallel connection are connected to the photo detector. In measuring the transmittance of a sample material in the sample cell, an output of the detector responding to a sample cell transmitted beam is directly supplied to the logarithmic amplifier without undergoing current-voltage conversion while an output of the detector responding to a reference cell transmitted beam is supplied to the current-voltage converting amplifier without undergoing logarithmic amplification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.