Spectral sensing system
The invention relates to a sensing system comprising at least one light emitting source, a sensing element comprising a sensing area, and an optical means for directing light being emitted by the at least one light emitting source onto the sensing area of the sensing element and for directing light being transmitted or reflected from the sensing area of the sensing element to an integrated interrogator; the interrogator having at least one detector configured for detecting part of the spectrum of the light directed from the sensing area of the sensing element.
1 . A sensing system comprising:
at least one light emitting source;
a sensing element comprising a sensing area; and
an optical director configured to direct light emitted by the at least one light emitting source onto the sensing area of the sensing element, and to direct light transmitted or reflected from the sensing area of the sensing element to an integrated interrogator;
wherein the integrated interrogator comprises at least two detectors, wherein each detector comprises a filter and is configured to detect part of the spectrum of the light directed from the sensing area of the sensing element, and wherein each filter is positioned on a top face of its respective detector or within its respective detector, as viewed from a direction of the light leaving the sensing element.
2 . The sensing system according to claim 1 , wherein the filters and the detectors are co-integrated in a resonant-cavity detector structure.
3 . The sensing system according to claim 1 , wherein the at least two detectors are arranged in a circular, a square, a rectangular, a spiral, or an interlaced configuration.
4 . The sensing system according to claim 1 , wherein the sensing area of the sensing element comprises at least one sample sensor part and at least one reference sensor part, and wherein multiple detectors are used in the interrogator to measure differential wavelength shifts between the at least one sample sensor part and the at least one reference sensor part.
5 . The sensing system according to claim 1 , wherein the sensing element is selected from the group including a grating, a photonic crystal, a metallic structure, a semiconductor structure, a Fabry-Perot cavity, and a semiconductor slab, and whereby the spectrum of light transmitted or reflected from the sensing element changes depending on temperature, pressure, refractive index, or the binding of molecules on the surface of the sensing area.
6 . The sensing system according to claim 1 , wherein a surface of the sensing area of the sensing element is configured to facilitate or suppress a selective binding of a certain molecule or type of molecule.
7 . The sensing system according to claim 1 , wherein the sensing element is configured to accommodate a microfluid cell element in the sensing area.
8 . The sensing system according to claim 1 , wherein:
the at least one light emitting source comprises an array of light emitting diode elements;
the sensor element comprises an array of sensor areas; and
the integrated interrogator comprises an array of detectors.
9 . The sensing system according to claim 1 , wherein the at least one light emitting source, the sensing element, and the integrated interrogator are mounted face-to-face in a linear or 2D matrix configuration.
10 . The sensing system according to claim 1 , wherein the at least one light source, the sensing element, and the optical director are optically coupled via single-mode or multi-mode optical fibers.
11 . The sensing system according to claim 1 , wherein the at least one light source, the sensing element, and the optical director are provided in a single housing module.