| 摘要 |
PURPOSE:To obtain a monochrometer which enables high speed scanning by using a diffraction grating having a blaze wavelength at 400-800nm, measuring the secondary light of the diffracted light to measure <=400nm wavelength and measuring the primary light to measure >=400nm wavelength. CONSTITUTION:Light of a wavelength lambda is made incident to a diffraction grating 3 having a blaze wavelength at 400-800nm through an incident slit 1 and a concave mirror 2, whereafter the light is diffracted and condensed by the mirror 4 and is drawn out from an exit slit 5. The secondary light in the light diffracted by a plane mirror 6 controlled with a control device 9 in this stage is detected with a photodetector 8b having sensitivity at <=400nm and the <=400nm light in the primary light is cut off with a filter 7. The >=400nm primary light is detected with a photodetector 8a. Therefore, the scanning range is made shorter as compared to the prior art which wherein only the primary light is measured, and the monochrometer which enables high speed scanning is obtd. |
