| 摘要 |
PURPOSE:To permit the execution of an internal standard correction within the same time by providing a means with which the other spectroscope detects the wavelength of the internal standard element by scanning and is fixed at said wavelength before one spectroscope detects the wavelength of a measuring element by scanning. CONSTITUTION:The light from induction coupled plasma 1 is split 2 and one of the beams is made incident on the 1st spectroscope 4 and the other beam is made incident via a mirror 3 to the 2nd spectroscope 5. The light which is made monochromatic 4 enters a multiplexer (MUX)1 via a photomultiplier 6 and a preamplifier 10. The light which is similarly made monochromatic 5 enters an MUX12 via a photomultiplier 7 and a preamplifier 11. The signal changed over tat a high speed by the MUX12 enters a CPU16 via an A/D converter 13 and a CPU bus 15. On the other hand, both spectroscopes 4, 5 are subjected to wavelength driving 18 by a pulse motor driving circuit 14 and pulse motors 8, 9 and before the spectroscope 4 detects the wavelength of the measuring element by scanning, the spectroscope 5 detects the wavelength of the internal standard element by scanning and is fixed at that wavelength, by which the internal standard correction is made possible.
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