Abstract: A photonic sensor system includes: a photodetector; a signal processor coupled to the photodetector; and a sensor structure configured to provide fluid-response selectivity, spatially distribute light, and to receive light from a light source and convey light to the photodetector. The sensor structure includes a plurality of fluid sensitive interferometric nanostructure layers manufactured on a substrate; wherein the plurality of fluid sensitive interferometric nanostructure layers includes alternating high and low porosity layers.

Abstract: A fluid sensor that includes fluid sensitive interferometric nanostructure layers configured into an open-air resonant structure. Another fluid sensor also includes a polarization sensitive photodetector configured to detect optical contributions of different components of a fluid to the structure. A photonic sensor system includes: a photodetector; a signal processor coupled to the photodetector; and a sensor structure configured to provide fluid-response selectivity, spatially distribute light, and to receive light from a light source and convey light to the photodetector. A method of selective measurement of components in fluid in a process area includes: exposing a sensing structure to the fluid; interrogating the sensing structure with light from outside the process area; measuring a change in optical properties of the sensing structure; correlating the measured change to a stored value; and providing quantitative values of levels of the components in the fluid.

Abstract: A sensor system for detection of an analyte in an industrial fluid in the presence of interferences which includes: a multivariable inductor-capacitor-resistor resonant transducer with multiple operationally independent outputs; a sensing material composition configured to provide different response patterns to an analyte in the fluid in the presence of interferences; and a signal processor that quantifies the analyte. Also, a sensor system for detection of an analyte that includes: a transducer with multiple operationally independent outputs; a sensing material compositions configured to provide different response patterns to an analyte in the industrial fluid in the presence of interferences; and a signal processor configured to quantify the analyte in the industrial fluid in the presence of interferences. An embodiment of the sensor system detects methane.