| 摘要 |
PURPOSE:To enable a high-accuracy measurement by measuring wavelength and correcting the sensitivity of a quantum type photoelectric converting element automatically according to the measured wavelength. CONSTITUTION:Unpolarized object light of power measurement applied to a beam splitter 6 is split into a 1st light beam and a 2nd light beam having linear polarized components. The 1st light beam is applied to a 1st photoelectric converting element 9 through a Faraday element 7 and a polarizing plate 8, and the 2nd light beam is applied to a 2nd photoelectric converting element 11. A controller 10 adjusts the intensity of a magnetic field applied to the Faraday element 7 so that the output signal of the 1st photoelectric converting element 9 is maximum. The wavelength of the light beam is found from the intensity of the magnetic field applied to the Faraday element 7. An arithmetic processor 13 corrects the spectral sensitivity characteristics to the output signal of an adder 12 based on wavelength data applied from the controller 10, automatically. |
