Patent ID: 8169608

Claim:
An optical characteristic measurement device, comprising: a housing; a spectrometer arranged in said housing; a photodetector arranged in said housing to receive light split by said spectrometer, said photodetector having a detection surface greater than a light incident surface receiving light from said spectrometer; and a processor configured to output a result of detection by said photodetector and configured to obtain a measurement spectrum detected in a first detection area corresponding to said light incident surface receiving light from said spectrometer and a signal intensity detected in a second detection area different from said light incident surface receiving light from said spectrometer, correct a pattern prepared in advance and exhibiting a noise characteristic of said photodetector based on said signal intensity to calculate a first correction spectrum, subtract a correction value calculated based on said signal intensity from each component value of said measurement spectrum to calculate a second correction spectrum, and subtract each component value of said first correction spectrum from a corresponding component value of said second correction spectrum to calculate an output spectrum representing a measurement result.