| Patents for G01H 9 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means (3,383) |
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| 04/30/1991 | US5012088 High performance fiber optic sensor |
| 04/30/1991 | US5011262 Fiber optic sensor array |
| 04/23/1991 | US5010248 Sampling hydrophone |
| 04/11/1991 | DE3932711A1 Sensitive optical shock wave sensor - has e.g. acrylic] light wave guide whose rounded end is described by specific equation and is immersed in liq. where shock wave spreads out |
| 04/04/1991 | DE3932056A1 Opto-electronic surface vibration measurer - uses reflection light barrier, voltage sources, resistors, amplifier and reflector |
| 03/27/1991 | EP0419021A2 Sensors with vibrating elements |
| 03/20/1991 | EP0417162A1 An interferometric fibre optic network |
| 03/19/1991 | US5001337 Fiber optic geophysical sensors |
| 03/06/1991 | EP0414889A1 Single beam ac interferometer |
| 03/05/1991 | US4998226 Hydrophone |
| 03/05/1991 | US4998225 Dual beam doppler shift hydrophone |
| 02/26/1991 | US4995257 Monitor for shaft vibration in an operating turbine |
| 02/19/1991 | US4994668 Planar fiber-optic interferometric acoustic sensor |
| 02/05/1991 | US4990791 Multi-dimensional laser Doppler velocimeter |
| 01/08/1991 | CA1278715C Fiber fabry-perot etalon |
| 01/02/1991 | EP0404984A1 Method and device for the representation and measurement of elastic waves with a laser probe |
| 12/25/1990 | US4979952 Ultrasonic vibration treatment apparatus |
| 12/25/1990 | US4979798 Pressure sensitive optical fiber having optimized coatings |
| 12/11/1990 | US4977546 Signal stabilization in optical hydrophones |
| 12/11/1990 | US4976507 Frequency shifter switch |
| 12/05/1990 | EP0216812B1 A measuring device |
| 11/28/1990 | EP0399861A1 Reading arrangement for polarimetric and interferometric sensors |
| 11/28/1990 | CN2066574U Device for measuring sound intensity |
| 11/22/1990 | EP0398319A2 Method and device for the interferometric detection of surface displacements of solid bodies |
| 11/14/1990 | EP0396811A1 Method and device for the true-phase representation and measurement of elastic wave fields using a laser probe |
| 11/14/1990 | EP0252971B1 System for marine seismic exploration |
| 11/13/1990 | CA1276078C Distributed sensor and method using coherence multiplexing of fiber-optic interferometric sensors |
| 11/07/1990 | CN1010346B Self-oscillating optical resonant sensor |
| 11/06/1990 | US4968144 Single beam AC interferometer |
| 10/31/1990 | EP0394219A1 Optical modulation and measurement process. |
| 10/30/1990 | US4966459 Broadband optical detection of transient motion from a scattering surface |
| 10/30/1990 | CA1275581C Method of producing a fiber-optical reflection sensor and sensor so produced |
| 10/18/1990 | DE4003787C1 Optical fibre monitoring device for foot step and sound detection - has light-waves, through fibre, modulated by mechanical stresses when trodden on or by sound-waves detected by microphone |
| 09/26/1990 | EP0301048B1 Improvements relating to optical interferometers |
| 09/25/1990 | US4959539 Sensor for acoustic vibrations in a fluid |
| 09/20/1990 | WO1990010842A1 Single beam ac interferometer |
| 09/11/1990 | US4956549 Optical sensing systems |
| 08/28/1990 | US4952797 System and method for optically controlled acoustic transmission and reception |
| 08/21/1990 | US4951271 Sensor for pressure variations in a fluid |
| 08/16/1990 | DE3903788A1 Acoustic sensor |
| 08/14/1990 | US4948255 Optical sensing device |
| 08/14/1990 | CA1272625A1 Optical devices |
| 08/09/1990 | DE4004669A1 Seismic vibration meter - with silicone oil filled cube monitored by three=dimensional light barriers |
| 07/18/1990 | EP0377571A1 Imaging process and system for transillumination with photon frequency marking. |
| 07/03/1990 | US4938597 Light responsive motion sensing device |
| 07/03/1990 | US4938225 Ultrasonic echograph utilizing at least one piezoelectric transducer with an associated random phase screen, and method of scanning an object by means of such an echograph |
| 05/29/1990 | US4929050 Traveling wave fiber optic interferometric sensor and method of polarization poling fiber optic |
| 05/29/1990 | US4928527 Method and device for nondestructive evaluation |
| 05/07/1990 | CA2002280A1 Turbine blade vibration monitor for non-magnetic blades |
| 05/02/1990 | EP0241530B1 Sensing system using fibre optic sensors |
| 05/01/1990 | US4922095 Method and apparatus for sensing disturbance using fiber-optic polarization rotation |
| 04/17/1990 | US4918303 Detecting disturbance with cross polarized fiber optic sensing |
| 04/10/1990 | US4914953 Turbine blade vibration monitor for non-magnetic blades |
| 04/03/1990 | US4913550 Interferometric measurement method and apparatus |
| 03/28/1990 | EP0360449A2 Acoustic transducing arrangements and methods |
| 03/20/1990 | CA1266786A1 Coherent distributed sensor and method using short coherence length sources |
| 03/06/1990 | US4905519 Interferometric vibration sensor |
| 02/27/1990 | US4905202 Detection panel and method for acoustic holography |
| 02/21/1990 | CN1006909B Photoelectric vibration measurer for spindle |
| 02/14/1990 | EP0354882A2 Fiber-optic vibration sensor |
| 02/14/1990 | EP0354229A1 Hydrophonic probe. |
| 02/13/1990 | US4900921 System and method for opto-acoustic liquid quantity measurement and transducer therefor |
| 02/13/1990 | US4900919 Wide bandwidth fiber optic accelerometer |
| 02/08/1990 | WO1990001149A1 An ultrasonic sensor |
| 02/06/1990 | US4898468 Sagnac distributed sensor |
| 01/30/1990 | US4896533 Miniaturization of flight deflection measurement system |
| 01/24/1990 | EP0351990A2 A hydrophone |
| 01/16/1990 | US4893930 Multiple axis, fiber optic interferometric seismic sensor |
| 01/10/1990 | CN1038701A Wide bandwidth fiber optic accelerometer |
| 01/09/1990 | US4892406 Method of and arrangement for measuring vibrations |
| 01/09/1990 | US4892373 Sign bit optical geophone |
| 01/02/1990 | US4891512 Thermo-optic differential expansion fiber sensor |
| 11/23/1989 | EP0342337A2 Device for the contactless recording of surface deviations of a specimen caused by ultrasound waves |
| 11/22/1989 | CN1037369A Photoelectric vibration measurer for spindle |
| 11/21/1989 | US4882716 Optic fiber hydrophone and antenna associating a series of hydrophones |
| 11/16/1989 | WO1989011110A1 An interferometric fibre optic network |
| 11/02/1989 | EP0339885A2 Method and device for nondestructive evaluation |
| 11/02/1989 | EP0339625A1 Broadband optical detection of transient motion from a scattering surface |
| 10/24/1989 | US4875373 Temperature compensated fiber optic vibration sensor |
| 10/10/1989 | US4872348 Signal added vibration transducer |
| 10/05/1989 | DE3810039A1 Optical oscillation-measuring device for glass fibres |
| 09/27/1989 | EP0334481A1 Optical fibre sensor |
| 09/26/1989 | US4870271 Method and apparatus for determining the size of defects in rolling element bearings with high frequency capability |
| 09/13/1989 | EP0331671A1 Self-oscillating, optical resonant sensor |
| 09/05/1989 | CA1259125A1 Sign bit optical geophone |
| 09/05/1989 | CA1259124A1 Sign bit optical-electrical geophone |
| 08/15/1989 | CA1258383A1 Wavelength switched passive fiber interferometric sensor |
| 08/08/1989 | US4854706 Modal domain optical fiber sensors |
| 08/02/1989 | EP0326476A1 Fibre-optical hydrophone, and antenna comprising a series of hydrophones |
| 08/02/1989 | EP0326199A2 An optical sensing apparatus |
| 07/27/1989 | WO1989006512A1 Hydrophonic probe |
| 07/25/1989 | US4850225 Measuring vibrational frequency of vibratable pins |
| 07/19/1989 | EP0324708A2 Method of and arrangement for measuring vibrations |
| 07/18/1989 | US4848906 Multiplexed fiber optic sensor |
| 07/04/1989 | US4844585 Optically excited vibratile transducer |
| 06/27/1989 | US4843597 System for marine seismic exploration |
| 06/27/1989 | US4843233 Device for detecting vibrations including a multimode optical fiber as sensitive element |
| 05/30/1989 | US4834111 Heterodyne interferometer |
| 05/16/1989 | US4830451 Technique and apparatus for fabricating a fiber Fabry-Perot etalon |
| 05/02/1989 | US4826322 Encapsulated motion transducer |