Patent ID: 9474476
Filing Date: 2016-10-25
CPC Classification: A61B,G01B,G01J,G01N

Claim Text:
1. A spectral characteristics measurement device comprising: a fixed mirror and a movable mirror; an incident optical system that causes measurement light emitted from an object to be measured to enter the fixed mirror and the movable mirror, wherein the fixed mirror and movable mirror are positioned adjacent to each other in an area such that: (1) the measurement light reaches the area defined by the fixed mirror and the movable mirror and (2) a part of the measurement light is reflected by the fixed mirror and a different part of the measurement light is reflected by the movable mirror; an imaging optical system that forms interference light of the light reflected by the fixed mirror and the light reflected by the movable mirror; a measurement light detector that detects an intensity of the interference light of measurement light formed by the imaging optical system, wherein an interferogram of measurement light is acquired based on a change in the intensity of the interference light of measurement light obtained by moving the movable mirror; a light casting surface that causes reference light of a narrow wavelength band included in a wavelength band of the measurement light to enter the fixed mirror and the moveable mirror; and a reference light detector that detects an intensity of interference light of the reference light formed by the imaging optical system, wherein the interferogram of measurement light is corrected based on an amplitude of a change in the intensity of the interference light of the reference light detected by the reference light detector by moving the movable mirror and based on a phase difference between narrow wavelength band measurement light having the same wavelength as the reference light in the measurement light and the reference light, and that acquires a spectrum of the measurement light based on the corrected interferogram of measurement light.