Patent ID: 8670122
Filing Date: 2014-03-11
Classification: G01N

Abstract:
1. A SPR measuring device comprising: a circularly polarized heterodyne light source that produces a circularly polarized heterodyne light beam; a beam splitting element that splits the circularly polarized heterodyne light beam into a reference beam and a signal beam; a first light sensing unit that receives a reference light intensity of the reference beam; a SPR sensor that receives the signal beam and reflects a reflected signal beam; a second light sensing unit that receives a reflected light intensity of the reflected signal beam; and a processing circuit that calculates a phase difference between the reference light intensity and the reflected light intensity; wherein the circularly polarized heterodyne light source includes: a heterodyne light source produces a heterodyne light beam, the heterodyne light source includes: a phase retardation component that retards the heterodyne light beam to produce the circularly polarized heterodyne light beam.