title: A far-field-viewing sensor for making analytical measurements in remote locations.
abstract: We demonstrate a far-field-viewing GRINscope sensor for making analytical measurements in remote locations. The GRINscope was fabricated by permanently affixing a micro-Gradient index (GRIN) lens on the distal face of a 350-micron-diameter optical imaging fiber. The GRINscope can obtain both chemical and visual information. In one application, a thin, pH-sensitive polymer layer was immobilized on the distal end of the GRINscope. The ability of the GRINscope to visually image its far-field surroundings and concurrently detect pH changes in a flowing stream was demonstrated. In a different application, the GRINscope was used to image pH- and O2-sensitive particles on a remote substrate and simultaneously measure their fluorescence intensity in response to pH or pO2 changes.
authors.affiliation: Max Tishler Laboratory for Organic Chemistry, Department of Chemistry, Tufts University, Medford, Massachusetts 02155, USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Michael
authors.forename: L C
authors.initials: LC
authors.lastname: Taylor
authors.forename: D R
authors.initials: DR
authors.lastname: Walt
mesh_terms: D002623:Chemistry Techniques, Analytical; D005336:Fiber Optic Technology; D011108:Polymers
chemical_list: D011108:Polymers