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| Number | Title | Issue Date |
| 7193720 | Optical vibration imager A remote sensor capable of imaging vibrations at many simultaneous points using high-speed imaging cameras is disclosed. The preferred embodiment operates in heterodyne detection mode using a single camera to capture signals to recover multi-pixel vibrations. One al... | 03/20/2007 |
| 6945114 | Laser-air, hybrid, ultrasonic testing of railroad tracks Formed Laser Sources (FLS) using pulsed laser light for generation of ultrasonic stress waves are combined with air-coupled detection of ultrasound to provide for the hybrid non-contact, dynamic and remote ultrasonic testing of structural materials, especially railr... | 09/20/2005 |
| 6907799 | Apparatus and method for non-destructive inspection of large structures An automated inspection system and method enables rapid, remote and non-contact inspection of large objects, utilizing non-destructive inspection techniques, that does not require continuous manual repositioning of the inspection equipment. The inspection system inc... | 06/21/2005 |
| 6647792 | Ultrasonic probe, ultrasonic receiver and ultrasonic diagnostic apparatus An ultrasonic probe which does not require electric wiring to a large number of microcomponents and does not induce increase of crosstalk and electric impedance. This ultrasonic probe comprises an optical transmission path array incorporating a plurality ... | 11/18/2003 |
| 6354147 | Fluid parameter measurement in pipes using acoustic pressures At least one parameter of at least one fluid in a pipe 12 is measured using a spatial array of acoustic pressure sensors 14,16,18 placed at predetermined axial locations x1,x2,x3 along the pipe 12. The pressure sensors 14,16,18 provide acoustic pressure s... | 03/12/2002 |
| 6056696 | Frustrated total internal reflection acoustic field sensor A frustrated total internal reflection acoustic field sensor which allows the acquisition of the acoustic field over an entire plane, all at once. The sensor finds use in acoustic holography and acoustic diffraction tomography. For example, the sensor may... | 05/02/2000 |
| 5900935 | Homodyne interferometer and method of sensing material Faults, dimensions and other characteristics of a material or structure are sensed by a coherent beam's reflection from the material during ultrasonic or very fast vibration. The reflected beam acquires a phase substantially different from its original ph... | 05/04/1999 |
| 5841030 | Process for the determining the vibration characteristics of a body A process is disclosed for determining the vibration characteristics of a body by modal analysis. The body is made to vibrate at different frequencies and optical interference images of the body are recorded for the different frequencies. The interference... | 11/24/1998 |
| 5827971 | Optical vibration detection spectral analysis assembly and method for detecting vibration in an object of interest A vibration detection assembly is described which includes an emitter of light which has object and reference beams, the object beam reflected off of a vibrating object of interest; and a photorefractive substance having a given response time and which pa... | 10/27/1998 |
| 5679899 | Method and apparatus for non-destructive testing of structures A system for non-destructively inspecting or testing for faults or damage in or beneath the surface of structures, such as debonds or delaminations in composite materials, or cracks, broken stringers, delaminations and the like in structures. High energy ... | 10/21/1997 |
| 5680212 | Sensitive and fast response optical detection of transient motion from a scattering surface by two-wave mixing A method and apparatus are provided of optically detecting transient motion from the surface of a workpiece. After directing a laser beam onto a surface of a workpiece the beam is reflected from it and then interferes with a pump beam removed from the las... | 10/21/1997 |
| 5166742 | Optical deformation measuring apparatus by double-writing speckle images into a spatial light modulator An object is typically illuminated by laser light, and reflected light carrying a speckle pattern is amplified by an image intensifier. First and second speckle patterns representing the object before and after its deformation, respectively are written by... | 11/24/1992 |
| 5146289 | Nondestructive testing using air-coupled acoustic excitation An object is tested for defects by interferometry, by comparing images of the object taken under stressed and unstressed conditions. The stress is applied by perturbing the object with acoustic waves, produced by a speaker directed towards the object, wit... | 09/08/1992 |
| 4913547 | Optically phased-locked speckle pattern interferometer An optically phase-locked electronic speckle pattern interferometer mixes a local oscillator beam with a beam reflected from a target surface to create a speckle pattern at each of two separate image planes. The speckle pattern includes speckles whose int... | 04/03/1990 |
| 4871255 | Optical nondestructive testing method of composite materials An optical nondestructive testing method of composite materials utilizes optical interferometry to find the resonant vibration from at least one surface of the target part of an object being inspected, and also determines the resonant frequency at that ti... | 10/03/1989 |
| 4807996 | Transient holographic indication analysis A method of holographic analysis of an article is disclosed. The method involves generating holograms of an article to be analyzed and a reference article over a range of excitation energy levels and comparing the features of the holograms so generated to... | 02/28/1989 |
| 4689993 | Measuring and mapping vibrations A method and a device for measuring and mapping vibrations wherein one or a number of local sensors and a measuring means can make local registrations and frequency decompositions of the vibrations of an oscillating object. The same sensors and measuring ... | 09/01/1987 |
| 4620223 | Interferometric deformation analysis system Object deformations are analyzed by recording interferometric images using a television camera. The camera's photosensitive recording cathode is successively exposed to interferometric images of the object, respectively before and after a stress is applie... | 10/28/1986 |
| 4507966 | Method and means for imaging sound waves In the disclosed method and structure a pulse of a sound filed to be mapped is illuminated at at least two extremes values at different moments with a laser beam of short duration compared to the period of the illuminated sound pulse and interference prod... | 04/02/1985 |
| 4408881 | Holographic inspection technique A nondestructive testing technique for examining the integrity of a bonded joint consists of forming a time-average hologram of the object while it is being vibrated at a number of frequencies generated at random within a defined bandwidth.... | 10/11/1983 |
| 4248093 | Holographic resolution of complex sound fields A system for determining the spatial structure or composition of complex sound fields within a duct or other structural enclosure that is excited by acoustic energy is disclosed wherein at least two holograms are recorded and analyzed to provide both the ... | 02/03/1981 |
| 4171914 | Hologram apparatus for testing welds Hologram apparatus for testing for defects in welds has a frame with means for supporting the frame. A laser beam is directed towards one end of the frame where it is reflected by a rotatable mirror onto an area of the weld lying in a predetermined direct... | 10/23/1979 |
| 4084427 | Holographic recording instrument for structural integrity verification and other applications An improved holographic recording instrument for recording on a holographic recording medium two successive holograms of the structure under differing stress conditions to produce a holographic interferogram containing information defining a deformation f... | 04/18/1978 |
| 4080823 | Vibration measurement Apparatus and methods for measuring deflection of rotating fan blades of a gas turbine engine is disclosed. The measurement of bending and torsional deformation in response to integral and to nonintegral vibration as well as to structural loading is devel... | 03/28/1978 |
| 4028935 | Method, appliance and installation for the optical determination of small displacements of points on the surface of a solid body The invention provides a method, an appliance and an installation for the termination of small displacements of points on the surface of a solid body. A catadioptric covering, such as a catadioptric paint or a piece of a sheet with catadioptric properties... | 06/14/1977 |
| 4028933 | Acoustic microscope A scanning acoustic microscope wherein a high frequency acoustic plane wave is focused by an acoustic lens to scan an object at the focal plane and is then recollimated by a second acoustic lens, detected with a piezoelectric detector, and the detected ac... | 06/14/1977 |
| 4013366 | Method and apparatus for investigation of small displacements of a solid body by means of coherent light Method and apparatus for monitoring the vibratory displacements of a diffusing or reflecting solid body which in a preferred application is a turbine blade. A laser source of rectilinearly polarized monochromatic light provides a laser beam which is direc... | 03/22/1977 |
| 3934461 | Multiple exposure holographic interferometer method Apparatus and method wherein a photographic plate is doubly exposed by pulsed laser illumination to record successive instants in the history of an object under consideration. The doubly exposed plate is then developed and the photograph or hologram is us... | 01/27/1976 |
