1
John W Berthold, Daniel P Birmingham: Fiber optic sensing system for monitoring restrictions in hydrocarbon production systems. The Babcock & Wilcox Company, Daniel S Kalka, Robert J Edwards, December 1, 1998: US05845033 (95 worldwide citation)

A sensor apparatus and method for identifying a restriction in the flowline of a hydrocarbon production system, utilizes an optical fiber or optical fiber cable which is engaged along and preferably spirally wound around and along the flowline. Spaced apart strain gauges which are advantageously in ...


2
John W Berthold, Garry W Roman: Fiber optic acoustic emission sensor. McDermott Technology, R C Baraona, Eric Marich, September 11, 2001: US06289143 (38 worldwide citation)

A fiber optic acoustic emission (FOAE) sensor particularly suitable for vibration sensing in a hostile environment has a pair of optical fibers each having an end face. In one embodiment, a hollow tube or core having opposite open ends receives the end faces of the optical fibers. Means are provided ...


3
John W Berthold III: Variable integrated optical logic element. The United States of America represented by the Director of the National Security Agency, John R Utermohle, Thomas O Maser, Barry N Young, April 21, 1981: US04262992 (36 worldwide citation)

A variable integrated optical logic element, formed on a substrate of electro-optic material, capable of being controlled to perform the six basic logic operations AND, OR, EXCLUSIVE OR, NAND, NOR and EXCLUSIVE NOR. The optical logic element comprises a plurality of single-mode optical waveguides wh ...


4
Hudson R Carter, John W Berthold, Charles C England: Video temperature monitor. The Babcock & Wilcox Company, Vytas R Matas, Robert J Edwards, Daniel S Kalka, July 6, 1993: US05225883 (34 worldwide citation)

An apparatus and method for providing a real-time video display and a temperature map display of an object, in particular a flame, comprises a single CCD video camera and optical equipment which focuses separate light bundles onto a photosensitive surface of the camera. A separate band pass filter i ...


5
John W Berthold, Cevdet G Koksal, Larry A Jeffers: Radiation imaging fiber optic temperature distribution monitor. The Babcock & Wilcox Company, Vytas R Matas, Robert J Edwards, Daniel S Kalka, February 4, 1992: US05086220 (29 worldwide citation)

A monitor for measuring the temperature distribution of a product (12) including a plurality of ball lenses (14) lying in a lenticular array (18) across the product (12). A signal processor (22) is connected to a photodiode array (20). Each photodiode in the array (20) is connected by a separate opt ...


6
J Jeffrey Kidwell, John W Berthold, Stuart E Reed: Optical fiber loop temperature sensor. The Babcock & Wilcox Company, Vytas R Matas, Robert J Edwards, Daniel S Kalka, November 2, 1993: US05258614 (26 worldwide citation)

A fiber optic loop temperature sensor employs a fiber optic loop (90) having a predetermined fixed radius where a light source (96) supplies light to the signal optical fiber (92) with the loop and a second reference optical fiber (100) receives light from the light source (96) for providing a refer ...


7
John W Berthold, Michael L Malito, Larry Jeffers: Fluorescence analyzer for lignin. The Babcock & Wilcox Company, Vytas R Matas, Robert J Edwards, Daniel S Kalka, June 15, 1993: US05220172 (24 worldwide citation)

A method and appartus for measuring lignin concentration in an undiluted sample of wood pulp or black liquor comprises a light emitting arrangement for emitting an excitation light through optical fiber bundles into a probe which has a sensing end facing the sample. The excitation light causes the l ...


8
John W Berthold, Michael L Malito, Larry Jeffers: Fluorescence analyzer for lignin. The Babcock & Wilcox Company, Robert J Edwards, Vytas R Matas, Daniel S Kalka, June 1, 1993: US05216483 (23 worldwide citation)

A method and apparatus for measuring lignin concentration in a sample of wood pulp or black liquor comprises a light emitting arrangement for emitting an excitation light through optical fiber bundles into a probe which has an undiluted sensing end facing the sample. The excitation light causes the ...


9
Stuart E Reed, John W Holman, John W Berthold: Temperature compensated microbend fiber optic differential pressure transducer. The Babcock & Wilcox Company, Daniel S Kalka, Robert J Edwards, February 7, 1995: US05386729 (19 worldwide citation)

A differential pressure transducer cell comprises a housing and a pair of spaced diaphragms connected at one end to one portion of the housing and connected at an opposite end to a second portion of the housing. The diaphragms have an outer surface and an inner surface; and the outer surface of each ...


10
John W Berthold: Distributed fiber optic temperature sensor based on time domain transmission. The Babcock & Wilcox Company, Vytas R Matas, Robert J Edwards, Daniel S Kalka, July 30, 1991: US05035511 (17 worldwide citation)

An apparatus and method for sensing temperature of a surface comprises a plurality of time domain intensity transmission networks. Each network comprises pairs of fiber optic power dividers which are connected to each other by bridges. One power divider in each pair is connected in a series by delay ...