PROBLEM TO BE SOLVED: To compensate deterioration of an interference signal obtained by OCT measurement and improve a quality of tomographic information obtained by frequency analysis.SOLUTION: Light in a predetermined wavelength band emitted from a light source is divided into measurement light and reference light reflected light produced by reflecting the divided measurement light from an object to be measured and the reference light are combined and the intensity of the interference light of the combined reflected light and the reference light is detected by an interference signal detector 2. The intensity of the interference light combining the reflected light that the measurement light is reflected from a predetermined depth position of a substance and the reference light is previously measured, by using the substance having characteristics similar to the object instead of the object and the attenuation factor and the refractive index obtained by the previous measurement are stored in a compensation data storing unit 51, as compensating data C. Attenuation compensation and dispersion compensation of the strength of the interference signal I is performed by using the compensation data C, by a compensating unit 52 and the tomographic information r(z) of the object is acquired by frequency analyzing the compensated interference signal Ic by a tomographic information acquiring unit 53.COPYRIGHT: (C)2008,JPO&INPIT【課題】OCT計測よって得られた干渉信号の劣化を補償し、周波数解析によって得られる断層情報の品質を向上させる【解決手段】干渉信号検出器2より、光源より射出した所定の波長帯域の光を測定光と参照光とに分割し、分割した前記測定光が測定対象から反射した反射光と前記参照光とを合波し、合波した前記反射光と前記参照光との干渉光の強度を干渉信号として検出する。測定対象の代わりに前記測定対象に近い特性を有す物質を用いて、該物質の所定の深さ位置から前記測定光が反射した反射光と前記参照光とを合波した干渉光の強度を予め計測して得られた減衰率と屈折率とを補償用データCとして補償データ記憶手段51に記憶する。補償手段52により補償用データCを用いて干渉信号Iの強度の減衰補償と分散補償を行ない、断層情報取得手段53により、補償された干渉信号Icを周波数解析することにより測定対象の断層情報r(z)を取得する。【選択図】図3
