Flame atomic absorption spectrophtometer including apparatus and method for logarithmic conversion
US4726679A · kind A · utility
5Cited by
4References
8Claims
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Key dates
| Filing date | Mar 3, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Mar 3, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/127
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The optical measurement signals in a flame atomic absorption spectrophotometer are first amplified in a substantially linear variable gain amplifier. The gain of the variable gain amplifier is adjusted to provide a predetermined magnitude of output signal during a calibration phase of the spectrophotometer. The resultant output signals from the variable gain amplifier are then converted to a logarithmic function in a logarithmic amplifier during optical absorption measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.