Abstract: Fiber optic sensors include sensor regions in which an optical phase is modulated by an analyte to be detected. A long period fiber grating (LPG) is coupled to a coating that is arranged to selectively interact with the analyte. The resulting phase change is detected based on a transmission spectrum associated with the LPG so that analyte is detected and quantified. A plurality of such sensors is distributed along a fiber to form a sensor array that can be situated to detect analyte at a plurality of discrete regions.

Abstract: Fiber optic sensors include sensor regions in which an optical phase is modulated by an analyte to be detected. A long period fiber grating (LPG) is coupled to a coating that is arranged to selectively interact with the analyte. The resulting phase change is detected based on a transmission spectrum associated with the LPG so that analyte is detected and quantified. A plurality of such sensors is distributed along a fiber to form a sensor array that can be situated to detect analyte at a plurality of discrete regions.

Abstract: An apparatus for measuring dimensions of a micro-scale object includes a movable stylus, a probe and at least one acoustic emissions sensor. The movable stylus is positionable to contact an object to be measured. The probe is rotatably coupled to the stylus and has a distal end that circumscribes a circle when rotated. The acoustic emissions sensor is operatively coupled to the probe. The sensor is operative to detect acoustic emissions generated from contact between the distal end of the probe and the object, thereby allowing dimensions of the object to be determined.