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US 4,890,919 AGranted
Atomic absorption spectrophotometer
AssigneeHitachi, Ltd.
InventorsMasamichi Tsukada, Konosuke Oishi, Katsuhito Harada, Toyoharu Okumoto
Life of this patent
Estimating the term…
Abstract
An atomic absorption spectrophotometer is disclosed in which, in order to detect the temperature of a graphite cuvette correctly on the basis of the radiation emitted from the inner wall of the graphite cuvette, the above radiation and the measuring light emitted from a hollow cathode lamp are both taken out by the same optical members, and then the radiation is separated from the measuring light, to be detected and used for measuring the temperature of the graphite cuvette.
Claims8
An atomic absorption spectrophotometer comprising:
- a light source for emitting measuring light;
- a graphite cuvette for atomizing a sample;
- first optical means for focusing the measuring light from said light source, on a position within said graphite cuvette;
- second optical means for focusing the measuring light having passed through said graphite cuvette, on a slit;
- separation means disposed between said second optical means and said slit for separating radiation which is emitted from the inner wall of said graphite cuvette, from the measuring light with substantially no reduction of the energy of the measuring light;
- detection means for detecting the radiation which has been separated form the measuring light;
- a spectroscope for separating the measuring light having passed through said slit, into spectral components;
- and
- a detector for detecting light which emerges from said spectroscope;
- wherein said separation means includes a reflecting plate having a through hole at a central portion thereof and being disposed between said second optical means and said slit, and the measuring light passes through said through hole.
7 more elements
An atomic absorption spectrophotometer comprising:
- a light source for emitting measuring light;
- a graphite cuvette for atomizing a sample;
- first optical means for focusing the measuring light from said light source, on a position within said graphite cuvette;
- second optical means for focusing the measuring light having passed through said graphite cuvette, on a slit;
- separation means disposed between said second optical means and said slit for separating radiation which is emitted from the inner wall of said graphite cuvette, from the measuring light with substantially no reduction of the energy of the measuring light;
- detection means for detecting the radiation which has been separated from the measuring light;
- a spectroscope for separating the measuring light having passed through said slit, into spectral components;
- and
- a detector for detecting light which emerges from said spectroscope;
- wherein said separation means includes an optical fiber.
7 more elements
Dependencies are inferred from the claim text.