| 摘要 |
PURPOSE:To accurately set an attenuating amount with a desired arbitrary wavelength by reducing the storage capacity of data and only measuring relation between the attenuating amount of two wavelengths and the rotational angle of a continuous attenuation filter. CONSTITUTION:An optical power meter measuring means 1 measures the rotational angle of the filter to the attenuatmng amount of two wavelengths in the range of use. This measured data is stored in a data storage part (storing means) 4 and when a wavelength/attenuating amount set part (setting means) 2 sets the wavelength and the attenuating amount, a linear approximating means 3a reads the measured data from the storing means 4 and linearly approximates it for each same attenuating amount. A calculating means 3b calculates the rotational angle of a continuous attenuation filter (filter) 7 to the attenuating amount of the set wavelength based on the linearly approximated data. |
