| abstract |
An optical spectrum sensing device is provided for determining at least one characteristic of a fluid. The apparatus includes an elongated porous body, a first end and a second end, a solid-state optical emitter at a first end of the body and oriented to emit radiation toward a second end of the body, and a solid-state optical emitter at a second end of the body, And a solid state optical detector oriented to detect the radiation emitted by the solid state optical detector. A package for detecting the characteristics of a fluid includes a body defining a cavity, and a movable and biased carrier for the optical detector or emitter is mounted in the cavity for increased reliability. A system for determining a relative concentration of a fluid in a sample includes emitter / detector pairs operating at a wavelength corresponding to a reference wavelength and an absorption peak of at least two fluids, and a processor for determining the concentration based on the measured data and the calibration data do. |