| 摘要 |
PURPOSE:To elevate the measuring accuracy with the applicability in a wider wavelength range, by using multiple degrees of diffraction light obtained from a grating varying the angle of the grating with respect to the incident light. CONSTITUTION:An output of an operation setting section 15 is fed to a wavelength range discriminating section 16 and a control section 18. The discriminating section 16 compares wavelengths, namely, those lambda4 and lambda6 governing the switching between the primary light 4a and a secondary light 4b set with a wavelength range setting section 17 with a wavelength data lambda outputted from the setting section 15. When the results of comparison are lambda<=lambda6, a signal S1 is fed to a control means 19 to select the secondary light and when they are lambda<=lambda4, a signal S2 is fed to a control means 20 to select the primary light. The control section 18 determines the angle of setting a grating 1 within a spectroscope 21 based on the signal S1 and S2 and the wavelength data lambda to control the position of a mirror 12 in a photo detector 9. |
