Patent ID: 8231833

Claim:
A whispering gallery mode resonator based optical sensor assembly comprising: a flow channel permeable to optical energy, first and second optical waveguides adjacent to a first section of said flow channel and adapted to be in first and second evanescent field couplings respectively with said first section, such that said first section forms a first whispering gallery mode resonator responsive to a first optical signal conveyed in said first optical waveguide and communicates a second optical signal to said second optical waveguide indicative of a resonance wavelength of the whispering gallery mode resonator; a first detector optically coupled to the second optical waveguide for detecting the output signal; and a signal processor for detecting a shift in the output signal responsive to an analyte fluid flowing through said first section, said shift being indicative of the identity of at least one constituent of the analyte fluid; wherein said first and second optical waveguides are arranged in a generally “V-shaped” configuration, defining an angle therebetween, wherein said angle between said first and second optical waveguides is adjustable.