Accession Number : ADD015207

Title :   Pressurized Membrane Chemical Sensor.

Descriptive Note : Patent, Filed 13 Oct 88, patented 15 Oct 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Inman, Scott M ; Lieberman, Stephen H ; Stromvall, Erik J

Report Date : 15 Oct 1991

Pagination or Media Count : 11

Abstract : A fiber optic based chemical sensor detects chemical species in solution. A fluorogenic indicator is forced through an ultrafiltration membrane into an analyte solution. Complex formation between indicator molecules and target ions occurs at the membrane-solution interface where light from a bifurcated fiber optic cable stimulates fluorescence. Fluorescent emission from a sample is transmitted back up the fiber optic cable to a linear photo diode detector. The sensor responds linearly to increasing and decreasing concentration changes on time scales of one second. Chemical modification of an indicator solution enhanced sensitivity. The present invention directed to providing a fiber optic sensor that uses a pressurized membrane indicator delivery system for remotely detecting chemical species in solution. The apparatus provides an indication of the concentration of a chemical of interest in solution. A source of radiation creates an illuminating wavelength and a detector of radiation at fluorescence wavelengths are appropriately optically coupled to a fiber optic cable. A reservoir of a ligand is included that has the property to fluoresce at the fluorescence wavelength when the chemical of interest is complexed with the ligand and is radiated with the illuminating wavelength.

Descriptors :   CHEMICAL PROPERTIES, CHEMICALS, DETECTORS, EMISSION, FIBER OPTICS, FIBER OPTICS TRANSMISSION LINES, FLUORESCENCE, FREQUENCY, ILLUMINATION, INDICATORS, IONS, LINEAR ARRAYS, MEMBRANES, MODIFICATION, MOLECULES, PHOTODIODES, PRESSURIZATION, RADIATION, SCALE, SOLUTIONS(GENERAL), SOURCES, TARGETS, TIME, ULTRAFILTRATION

Subject Categories : Miscellaneous Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE