Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1999-01-28
2000-02-01
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01N 2174
Patent
active
060209585
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 measurement conditions.
REFERENCES:
patent: 4890919 (1990-01-01), Tsukada et al.
Moriya Kazuo
Terui Yasushi
Tobe Hayato
Yamashita Hiromi
Evans F. L.
Hitachi , Ltd.
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