Patent ID: 6633384
Filing Date: 2003-10-14
Classification: G01B,G01D,G01N

Abstract:
An optical interferometeric apparatus for measuring incoming de-polarized light comprising:a first cavity having a first confocal lens structure; a second cavity having a second confocal lens structure; a beam splitter for dividing incoming de-polarized light into a first polarized light component and a second polarized light component and for directing said first and second polarized light components into the first and second cavities; a first collection optics for collecting light transmitted through the first confocal lens structure wherein said collected light being represented by variable VT1; a second collection optics for collecting light reflected back through the first confocal lens structure wherein said collected light being represented by variable VR1; a third collection optics for collecting light transmitted through the second confocal lens structure wherein said collected light being represented by variable VT2; a fourth collection optics for collecting light reflected back through the first confocal lens structure wherein said collected light being represented by variable VT2; a control system for adjusting the first cavity to vary an amount of light transmitted through the first cavity in relationship to an amount of light reflected back through the first cavity; and a second control system for adjusting the second cavity to vary an amount of light transmitted through the second cavity in relationship to an amount of light reflected back through the second cavity.