Patent ID: 11940386
Assignee: THE UNIVERSITY OF BRITISH COLUMBIA
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 28:
29. Apparatus for monitoring a sample for at least one analyte, the apparatus comprising:
an optical waveguide comprising a sensing portion and a phase shift portion wherein the sensing portion passes through a volume for receiving the sample;
a fixed wavelength light source coupled to deliver fixed wavelength light into the waveguide;
a phase shift modulator operative to periodically modulate a phase shift of the light effected by the phase shift portion of the optical waveguide;
at least one light detector operable to monitor an intensity of the light relative to the phase shift of the light effected by the phase shift portion of the waveguide; and
a second optical waveguide comprising a second sensing portion and a second phase shift portion, wherein the sensing portion passes through a volume for receiving a second sample;
wherein the light source is coupled to deliver fixed wavelength light into the second waveguide;
a second phase shift modulator operative to periodically modulate a phase shift of the light effected by the second phase shift portion of the second waveguide; and
wherein the at least one light detector is operable to monitor an intensity of the light relative to the phase shift of the light effected by the second phase shift portion of the second waveguide.