Atomic absorption spectrophotometer
US6020958A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1999 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Jan 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3103
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An atomic absorption spectrophotometer possessing an electrical heating unit which includes a graphite tube for atomizing a sample by heating the sample; a light emitting unit for emitting measuring light and irradiating the atomized sample with the measuring light; a spectroscope unit for diffracting the measuring light passing the electrical heating unit and selecting the required wavelength component; a detection unit for detecting the quantity of the required wavelength component selected by the spectroscope unit; an input unit to input at least one of the wavelengths of the required wavelength component and the required heating temperature of the electrical heating unit; and a control unit for controlling the above units, which comprises a shading device provided at the propagation axis of the measuring light between the electrical heating unit and the detection unit, and which possesses a light transmitting unit, for restricting the quantity of the measuring light passing the electrical heating unit, with the area of the light transmitting unit being changeable; and wherein the area of the light transmitting unit in the shading device is changed according to the set measureme…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.