Patent ID: 8988688
Filing Date: 2015-03-24
Classification: G01N

Abstract:
1. An optical sensing device comprising: a source unit configured to generate a polychromatic light beam containing p-polarized and s-polarized components, a spectral interferometric unit configured to split the light beam into a probe beam passing a first path and a reference beam passing a second path and to recombine the probe beam output from the first path and the reference beam output from the second path, wherein both of the beams contain p- and s-polarization components, wherein the interferometric unit is a spectral interferometric unit that comprises: a beam splitter splitting the light beam into the probe beam and the reference beam; a first reflective unit located at the end of the first path to reflect the probe beam so that the probe beam passes the sensing unit twice; and a second reflective unit located at the end of the second path to reflect the reference light so that the reference beam passes the reference unit twice, wherein the reflected probe beam and the reflected reference beam are recombined by the beam splitter; a sensing unit disposed in the first path to introduce a first SPR effect associated with a target sample to the probe beam; and a detection unit, detecting target sample characteristics by obtaining an intensity spectrum of the recombined light beam, the detection unit further comprising a dual channel analyzer wherein each channel of the dual channel analyzer comprises: a reference unit disposed in the second path to introduce a second SPR effect associated with a reference sample to the reference beam so as to provide optical path compensation on spectral dispersion introduced by the sensing unit, wherein each of the sensing unit and the reference unit is a long-range SPR sensing unit comprising: