Loss compensation using digital-signal processing in fiber-optic fluorescence sensors
AssigneeAmerican Research Corporation of Virginia
InventorsK. Peter Lo, Howard P. Groger, Shufang Luo, Russell J. Churchill
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Abstract
An optical fiber fluorescence sensor system capable of compensating fiber bending loss is provided. The system uses a modulated light-emitting diode and digital-signal processing chips to enhance the measurement of fluorescence signals. A fiber-optic oxygen sensor system suitable for measuring oxygen levels in gas and in aqueous media is provided. The system alleviates fiber bending loss. Detection of the signal-to-noise ratio of the system which exceeds 30 dB is done by using inexpensive components.
Claims21
A fiber-bending loss compensating system comprising a light source, a fiber-optic fluorescence sensor, a digital-signal processor connected to the sensor for enhancing a measurement of fluorescence signals and a computer for analyzing and outputting data relative to the signals, wherein the sensor is a fiber-optic oxygen sensor for measuring oxygen levels in a medium, further comprising a ruthenium complex in the oxygen sensor for quenching the fluorescence by singlet oxygen atoms.
A fiber-bending loss compensating system comprising a light source, a fiber-optic fluorescence oxygen sensor for measuring oxygen levels, a ruthenium complex in the sensor for quenching fluorescence signals by singlet oxygen atoms, a digital-signal processor connected to the sensor for enhancing a measurement of the fluorescence signals and a computer for analyzing and outputting data relative to the signals, wherein the ruthenium complex is Ruthenium (II) tris (4,7-diphenyl-1,10-phenanthroline) dichloride.
Dependencies are inferred from the claim text.