| 摘要 |
PURPOSE:To eliminate difference in steps of spectrum recording due to rapid change in a stray light and the like, by attaching plural kinds of filters to the periphery of a rotary disk so that the filters can be driven by a pulse motor, and slowly changing the filters in correspondence with the range of a specified wavelength in synchronization with the wavlength sending of a spectroscope. CONSTITUTION:A CPU controls the rotation of a pulse motor PM and a wavelength scanning pulse motor 6 of a spectroscope 2 through driver circuits 4 and 5. Plural kinds of filters F are attached to the periphery of a fan shaped plate. One edge of the fan shaped plate is detected by a photocoupler PC. The fan shaped plate is stopped at an edge detecting position. In synchronization with the pulses for wavelength scanning of the spectroscope, the pulses are sent to the driver circuit 4. The fan shaped plate is rotated in synchrnization with the spectroscope through the pulse motor PM. The filters are sequentially changed in correspondence with the range of the specified wavelength. The transmitted light is detected by a light receiving element D. Therefore, the difference in steps of the spectrum recording due to the rapid change in a stray light and the like can be eliminated. |
