apparatus for detecting defects, particularly in castings

1
4,824,016 43.40.Yq ACOUSTIC MONITORING OF TWO PHASE FEED NOZZLES GeorgeD. Cody et al., assigners to Exxon Research and Engineering Company 25 April 1989 (Class 239/8); filed 10 December 1987 Monitoring of nozzles that carry two-phase flows, such assteam and heavy oil, in chemical process plants is accomplished by use of accelere- meters attached to these nozzles. Changes in the spectra of the accelere- meter signals relative to a baseline spectrum areobserved in order to detect plugging of the nozzle andother flowirregularities.--EEU 4,841,774 43.40.Yq LASER ACCELEROMETER Lawrence H. Hall, assignerto Litton Systems, Incorporated 27 June 1989 (Class73/517R); filed 20 January 1988 This accelerometer uses a two-branched linear gaslaser with a cavity that isbent through some angle. In addition to the laser's two endmirrors, a third mirror is positioned at the bend in the cavity. The end mirrors and cavities are supported on cantilever beams relativeto the third mirror. Un- der acceleration, the angleof the cavities changes, resulting in frequency splitting that isa function of that angle, whichsplitting issensed to provide a measure of the acceleration.--EEU 4,829,822 43.40.Yq SEMICONDUCTOR ACCELEROMETER Masahito Imai et al., assigners to Nippondenso Company 16 May 1989 (Class 73/516 R); filed in Japan 17 September 1987 This patent pertains to an accelerometer in whicha cantilever of a semiconductor material serves as the seismic mass and the same material serves as a straingage at the root of the cantilever. This arrangement is mounted in a housing, whichis filledwith a liquidto provide damping.-- EEU 4,841,775 43.40.Yq VIBRATORY TRANSDUCER Kyoichi Ikeda, Tetsuya Watanabe, and Yasushi Higashino, assigners to Yokogawa Electric Corporation 27 June 1989 (Class73/704); filed in Japan 6 September 1985 This semiconductor transducer is intended for measurement of pres- sure, temperature, density, etc., 'by detecting changes in theresonance fre- quency of a vibrating-beam element.It incorporates means for inducing vibrations and for sensing these, as well as control and output circuits.-- EEU. 4,829,823 43.40.Yq APPARATUS FOR DETECTING DEFECTS, PARTICULARLY IN CASTINGS Jacob Michel, Hennebont, France 16 May 1989 (Class73/579); filed in France 27 December1985 Theapparatus described in this patent consists ofone or more vibrators and oneor more vibrationsensors attached to an item to betested, together with a microprocessor-controlled system for measuring the item's reso- nance frequencies. Changes in these frequencies fromstandard values pro- vide indications of defects.--EEU 4,843,233 43.40.Yq DEVICE FOR DETECTING VIBRATIONS INCLUDING A MULTIMODE OPTICAL FIBER AS SENSITIVE ELEMENT Luc Jeunhomme, assigner to Photonetics A.S. 27 June 1989 (Class250/227); filed in France 11 May 1987 In this device, oneendof a multimode opticalfiberis illuminated by a coherent light source and a photodetector senses the light emitted from the other end. Disturbances of the fibergive riseto "speckles" resulting from interferences due to different optical paths for the different optical modes propagating on the fiber.--EEU 4,834,111 43.40.Yq HETERODYNE INTERFEROMETER S. M. Khanna, J. F. Willemin, andR. Dandiker, assigners to Columbia University 30 May 1989 (Class 128/774); filed 12 January 1987 An optical interferometer, useful for measuring vibration of the inner ear or of otherobjects that havereflectivities of less than about 0.02% and that vibrate at amplitudes of less thanabout 10-•7 cm, makes use of a modulated laser and a beam splitter. The modulated reference light wave and that reflected from the vibrating object are recombined and sensed by a photodetector. The resulting frequency-modulated signal provides a mea- sure of the vibration.--EEU 4,826,322 43.40.Yq ENCAPSULATED MOTION TRANSDUCER Gerald J. Philips, Annapolis, MD 2 May 1989 (Class 356/373); filed 18 July 1986 Since accurate dynamic measurements cannot bemade with fiber optic devices where theoptical targetor theoptical path to thetarget is contami- nated,the tip of this opticalfiber device is encapsulated in a cylindrical container. At the far end of this container, there is an opticaltarget that is spring loaded, so that this target moves with the item, havingits motion measured if the device is pressed against the item.--EEU 4,836,025 43.40.Yq ACCELERoMETER Teruyoshi Mihara, assigner to Nissan Motor Company 6 June 1989 (Class 73/517R); filed in Japan 14 March 1986 Thispatent relates to a semiconductor accelerometer that uses a bridge of piezoresistive elements located on a flexure to sense the deflection in- ducedby acceleration of a mass.--EEU 4,829,821 43.40.Yq OPTICAL FIBER ACCELERoMETER Edward F. Careme, Shaker Hts., OH 16 May 1989 (Class73/516 LM); filed 8 April 1987 Two opticalfibercoilsare mounted in a housing containing a dense fluid. One of these coils is immersed in the fluid; the other is isolated from it. Phase-coherent light transmitted through the two coils is used to measure thechange in theoptical fiber length caused byacceleration of thesystem.-- EEU 1382 J. Acoust. Soc. Am. 87(3), March 1990; 0001-4966/90/031382-01500.80; @ 1990 Acoust. Soc. Am.; Patent Reviews 1382 Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 136.160.185.11 On: Wed, 03 Dec 2014 04:10:22

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Page 1: Apparatus for detecting defects, particularly in castings

4,824,016

43.40.Yq ACOUSTIC MONITORING OF TWO PHASE FEED NOZZLES

George D. Cody et al., assigners to Exxon Research and Engineering Company

25 April 1989 (Class 239/8); filed 10 December 1987

Monitoring of nozzles that carry two-phase flows, such as steam and heavy oil, in chemical process plants is accomplished by use of accelere- meters attached to these nozzles. Changes in the spectra of the accelere- meter signals relative to a baseline spectrum are observed in order to detect plugging of the nozzle and other flow irregularities.--EEU

4,841,774

43.40.Yq LASER ACCELEROMETER

Lawrence H. Hall, assigner to Litton Systems, Incorporated 27 June 1989 (Class 73/517R); filed 20 January 1988

This accelerometer uses a two-branched linear gas laser with a cavity that is bent through some angle. In addition to the laser's two end mirrors, a third mirror is positioned at the bend in the cavity. The end mirrors and cavities are supported on cantilever beams relative to the third mirror. Un- der acceleration, the angle of the cavities changes, resulting in frequency splitting that is a function of that angle, which splitting is sensed to provide a measure of the acceleration.--EEU

4,829,822

43.40.Yq SEMICONDUCTOR ACCELEROMETER

Masahito Imai et al., assigners to Nippondenso Company 16 May 1989 (Class 73/516 R); filed in Japan 17 September 1987

This patent pertains to an accelerometer in which a cantilever of a semiconductor material serves as the seismic mass and the same material

serves as a strain gage at the root of the cantilever. This arrangement is mounted in a housing, which is filled with a liquid to provide damping.-- EEU

4,841,775

43.40.Yq VIBRATORY TRANSDUCER

Kyoichi Ikeda, Tetsuya Watanabe, and Yasushi Higashino, assigners to Yokogawa Electric Corporation

27 June 1989 (Class 73/704); filed in Japan 6 September 1985

This semiconductor transducer is intended for measurement of pres- sure, temperature, density, etc., 'by detecting changes in the resonance fre- quency of a vibrating-beam element. It incorporates means for inducing vibrations and for sensing these, as well as control and output circuits.-- EEU.

4,829,823

43.40.Yq APPARATUS FOR DETECTING DEFECTS, PARTICULARLY IN CASTINGS

Jacob Michel, Hennebont, France 16 May 1989 (Class 73/579); filed in France 27 December 1985

The apparatus described in this patent consists of one or more vibrators and one or more vibration sensors attached to an item to be tested, together with a microprocessor-controlled system for measuring the item's reso- nance frequencies. Changes in these frequencies from standard values pro- vide indications of defects.--EEU

4,843,233

43.40.Yq DEVICE FOR DETECTING VIBRATIONS INCLUDING A MULTIMODE OPTICAL FIBER AS

SENSITIVE ELEMENT

Luc Jeunhomme, assigner to Photonetics A.S. 27 June 1989 (Class 250/227); filed in France 11 May 1987

In this device, one end of a multimode optical fiber is illuminated by a coherent light source and a photodetector senses the light emitted from the other end. Disturbances of the fiber give rise to "speckles" resulting from interferences due to different optical paths for the different optical modes propagating on the fiber.--EEU

4,834,111

43.40.Yq HETERODYNE INTERFEROMETER

S. M. Khanna, J. F. Willemin, and R. Dandiker, assigners to Columbia University

30 May 1989 (Class 128/774); filed 12 January 1987

An optical interferometer, useful for measuring vibration of the inner ear or of other objects that have reflectivities of less than about 0.02% and that vibrate at amplitudes of less than about 10-•7 cm, makes use of a modulated laser and a beam splitter. The modulated reference light wave and that reflected from the vibrating object are recombined and sensed by a photodetector. The resulting frequency-modulated signal provides a mea- sure of the vibration.--EEU

4,826,322

43.40.Yq ENCAPSULATED MOTION TRANSDUCER

Gerald J. Philips, Annapolis, MD 2 May 1989 (Class 356/373); filed 18 July 1986

Since accurate dynamic measurements cannot be made with fiber optic devices where the optical target or the optical path to the target is contami- nated, the tip of this optical fiber device is encapsulated in a cylindrical container. At the far end of this container, there is an optical target that is spring loaded, so that this target moves with the item, having its motion measured if the device is pressed against the item.--EEU

4,836,025

43.40.Yq ACCELERoMETER

Teruyoshi Mihara, assigner to Nissan Motor Company 6 June 1989 (Class 73/517R); filed in Japan 14 March 1986

This patent relates to a semiconductor accelerometer that uses a bridge of piezoresistive elements located on a flexure to sense the deflection in- duced by acceleration of a mass.--EEU

4,829,821

43.40.Yq OPTICAL FIBER ACCELERoMETER

Edward F. Careme, Shaker Hts., OH 16 May 1989 (Class 73/516 LM); filed 8 April 1987

Two optical fiber coils are mounted in a housing containing a dense fluid. One of these coils is immersed in the fluid; the other is isolated from it. Phase-coherent light transmitted through the two coils is used to measure the change in the optical fiber length caused by acceleration of the system.-- EEU

1382 J. Acoust. Soc. Am. 87(3), March 1990; 0001-4966/90/031382-01500.80; @ 1990 Acoust. Soc. Am.; Patent Reviews 1382

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 136.160.185.11 On: Wed, 03 Dec 2014 04:10:22