Medamicus, Inc.

Dennis S Madison

A closed loop control system for a fiber optic pressure transducer and a method of operation for such a system are disclosed. A flexible, pressure sensitive membrane of the pressure transducer is pressure coupled on one surface to a pressure to be measured and on its opposite surface to a sealed passage within an optical fiber pathway connected to a control module. The pressure within the passage is adjusted by a pressure generator to compensate for changes in the pressure being measured, in response to an output signal from a comparator in the control module. That output signal is the result of a comparison between a predetermined reference pressure signal and a modulated light signal from the pressure transducer indicative of a change in the measured pressure. The adjusted pressure within the lumen passage is sensed to provide a pressure reading equivalent to the measured pressure, since the pressure in the lumen passage is adjusted to equalize the pressures on the opposite surfaces of the pressure sensitive membrane.

Closed loop pressure determination system and method for fiber optic

The present invention provides a method for normalization and calibration of a fiber optic pressure transducer wherein the normalization routine includes measuring the minimum and maximum light signals returning from the pressure transducer and adjusting the offset and the gain such that the difference is a predetermined constant and wherein the calibration method has steps including: measuring the light signals and the pressures associated therewith for a variety of pressures; evaluating the light signals at preselected intervals by averaging the light signal with the one preceding it and following it; constructing a table having the evaluated light signals and the pressure readings associated therewith.

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Ramsey, MN, United States of America

Dennis S Madison