| 摘要 |
PURPOSE:To easily obtain a spectral output at a prescribed level necessary for a measurement processing by arranging a CCD in the imaging position of a spectroscopic optical system for conducting a spectral diffraction on measuring light and forming an image, conducting a conversion to electric signals and controlling the exposure time of the CCD in accordance with the intensity of the measuring light. CONSTITUTION:As a CCD 6, the line sensor type CCD is used wherein a plurality of photodetector pixels are arranged on a straight line. Photoelectric signals corresponding to spectral intensity from the CCD 6 are converted to digital signals to be written in a buffer memory 9. A gate circuit 8 reads out photoelectric data from the memory 9 to supply a CPU 10 therewith. The CPU 10 conducts a measurement processing determined in advance on the basis of the photoelectric data detected by the CCD 6 to obtain spectral intensity distribution and, at the same time, sets the exposure time of the CCD 6. Receiving the setting signal of the exposure time from the CPU 10, an exposure time control circuit 12 controls the exposure time and the exposure time of the CCD 6 can be determined by the driving control of a CCD driving circuit 13. |
