Patent ID: 9086264
Filing Date: 2015-07-21
Classification: G01B,G01N

Abstract:
1. An apparatus comprising: a first light path of a spectral domain optical coherence tomography (OCT) system reference arm through which a horizontally-polarized light beam passes; a second light path of the spectral domain OCT system reference arm through which a vertically-polarized light beam passes; a mobile reference mirror to reflect the horizontally-polarized light beam and the vertically-polarized light beam to form a joined beam with an optical pathlength difference between the horizontally-polarized light beam and the vertically-polarized light beam; and a signal modulation device that moves the mobile reference mirror at a constant velocity across a B scan to modulate, at a constant modulation frequency, an interference signal formed by the horizontally- and vertically-polarized light beams.