| 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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| 05/02/1989 | US4825698 Method of measuring direction of mechanical vibrations |
| 04/25/1989 | US4825424 Sensing systems |
| 04/25/1989 | US4824240 Internal laser interferometer |
| 04/25/1989 | CA1253211A1 Laser based sensor and telemetry system |
| 04/04/1989 | US4818064 Sensor array and method of selective interferometric sensing by use of coherence synthesis |
| 03/21/1989 | US4814603 Method and apparatus for determining the size of defects in rolling element bearings with high frequency capability |
| 03/21/1989 | CA1251552A1 Non-coherent frequency source and sector scanning apparatus for ultrasonic imaging system using a liquid crystal detector cell |
| 03/09/1989 | WO1989002067A1 Improvements relating to optical sensing systems |
| 03/09/1989 | WO1989002063A1 Improvements relating to optical fibre sensors |
| 03/08/1989 | EP0306227A2 Fiber optic sensor |
| 02/28/1989 | US4807996 Transient holographic indication analysis |
| 02/21/1989 | US4805985 Method of producing a fiber-optical reflection sensor and sensor so produced |
| 02/01/1989 | EP0301048A1 Improvements relating to optical interferometers. |
| 01/31/1989 | US4801799 Fiber optic system for detecting vibrations of a reflecting surface |
| 01/26/1989 | WO1989000677A1 Self-oscillating, optical resonant sensor |
| 01/24/1989 | US4800266 Fiber optic sensor with light sampling for referencing |
| 01/24/1989 | US4799752 Fiber optic gradient hydrophone and method of using same |
| 01/18/1989 | EP0299638A2 Improvements relating to optical sensing systems |
| 01/17/1989 | US4799202 Complementary interferometric hydrophone |
| 01/17/1989 | US4798087 Inclination detector |
| 01/12/1989 | WO1989000278A1 Imaging process and system for transillumination with photon frequency marking |
| 01/11/1989 | EP0298899A2 Transient holographic indication analysis |
| 01/11/1989 | EP0298090A1 Acoustic sensor |
| 01/11/1989 | CN1030302A 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 |
| 01/03/1989 | US4795226 Optical fibre reflective diffraction grating devices |
| 12/20/1988 | US4792931 Optical seismic detector |
| 12/07/1988 | EP0293996A1 Ultrasonic echographic apparatus using at least one piezoelectric transducer in association with a phase-randomizing screen, and method for the examination of a medium by means of such an echographic apparatus |
| 12/06/1988 | US4789240 Wavelength switched passive interferometric sensor system |
| 12/06/1988 | US4788866 Method and apparatus for visualizing ultrasonic waves in liquid-solid systems |
| 12/06/1988 | US4788865 Construction of liquid crystal cell for acoustic imaging |
| 12/06/1988 | CA1246201A1 Ultrasonic detector cell and system |
| 11/29/1988 | US4787741 Fiber optic sensor |
| 11/29/1988 | US4787248 Method for measuring amplitude of mechanical vibrations |
| 11/17/1988 | EP0291404A1 Vibration-detecting device comprising a multimode optical fibre as the sensitive element |
| 11/02/1988 | EP0288489A1 Encapsulated motion transducer |
| 10/18/1988 | US4777825 Stabilized reference surface for laser vibration sensors |
| 09/27/1988 | US4773758 For sensing a time varying quantity |
| 09/20/1988 | US4772786 Photothermal oscillator force sensor |
| 09/13/1988 | US4771182 Spurious electromagnetic energy discriminator for electro-optical inspection systems |
| 09/13/1988 | US4770535 For remotely sensing environmental effects |
| 09/06/1988 | US4768381 Optical vibrometer |
| 08/30/1988 | US4767210 Optical fibre interferometer |
| 08/11/1988 | WO1988005903A1 Improvements relating to optical interferometers |
| 08/11/1988 | WO1988000684A3 Encapsulated motion transducer |
| 08/10/1988 | EP0277699A2 Multiplexed fiber optic sensor |
| 07/28/1988 | DE3700867A1 Method of contact-free detection of ultrasonic waves in a specimen |
| 07/07/1988 | DE3642055A1 Device for directly converting sound into digital information, digital microphone |
| 07/06/1988 | EP0100357B1 Methods and means for utilizing apodized beams |
| 06/14/1988 | US4751690 Fiber optic interferometric hydrophone |
| 06/14/1988 | US4751382 Laser sensor with encoded laser output signal |
| 06/07/1988 | US4749254 Optical sensor system |
| 06/02/1988 | WO1988004032A1 Acoustic sensor |
| 06/01/1988 | EP0269429A2 Acoustic imaging system and liquid crystal cell therefor |
| 06/01/1988 | DE3640950A1 Optoelectrical evaluation device for a fibre-optic interferometer |
| 05/17/1988 | US4744625 Methods of and apparatus for providing frequency modulated light |
| 05/10/1988 | US4743113 Optical fiber interferometer network |
| 04/27/1988 | EP0264622A1 Process for monitoring the deformations of components by means of optical wave guides |
| 04/27/1988 | EP0264509A1 Optical seismic detector |
| 03/30/1988 | EP0261768A2 Laser based sensor and telemetry apparatus |
| 03/29/1988 | US4733963 Method of measuring a sound pressure distribution in a solid body due to a ultrasonic probe by using photoelasticity |
| 03/29/1988 | US4733561 Self-oscillating, optical resonant sensor |
| 03/22/1988 | US4732599 Detecting displacement of a part; bonding to substrate |
| 03/10/1988 | WO1988001367A3 Spurious electromagnetic energy discriminator for electro-optical inspection systems |
| 02/25/1988 | WO1988001367A2 Spurious electromagnetic energy discriminator for electro-optical inspection systems |
| 02/09/1988 | US4723448 Method for remotely inspecting solid structures for discontinuities utilizing laser techniques |
| 02/03/1988 | CN87105179A Self-oscillating optical resonant sensor |
| 01/28/1988 | WO1988000684A2 Encapsulated motion transducer |
| 01/20/1988 | EP0252971A1 System for marine seismic exploration. |
| 01/19/1988 | CA1231549A1 Passive interferometric sensor arrays |
| 01/07/1988 | EP0251632A2 Distributed sensor array and method using a pulsed signal source |
| 12/29/1987 | CA1230753A1 Laser heterodyne interferometric method and system for measuring ultrasonic displacement |
| 11/24/1987 | CA1229674A1 Fiber optic sensor for detecting very small displacements of a surface |
| 11/07/1987 | CN86210604U Mechanical laser strobovibration controlling meter |
| 11/04/1987 | CN87203737U Sensor of multi-purpose electronic detector |
| 11/03/1987 | US4704540 Photoelectric shock wave detection system for vacuum protection |
| 10/27/1987 | US4703287 Phase modulator for fiber-optic sensors |
| 10/21/1987 | EP0241530A1 Sensing system using fibre optic sensors. |
| 10/13/1987 | US4699513 Distributed sensor and method using coherence multiplexing of fiber-optic interferometric sensors |
| 10/06/1987 | US4697926 Coherent distributed sensor and method using short coherence length sources |
| 09/17/1987 | DE3607868A1 Device for scanning mechanical vibrations by means of optoelectronic elements using the reflection principle |
| 09/15/1987 | US4694162 Sign bit optical-electrical geophone |
| 09/09/1987 | EP0235801A2 Fiber fabry-perot etalon |
| 09/01/1987 | US4689993 Measuring and mapping vibrations |
| 08/19/1987 | EP0232610A2 Force sensor using a vibrating element |
| 08/18/1987 | US4688200 Optical system for detecting acoustic wave energy in a fluid medium |
| 08/04/1987 | CA1224935A1 Optical interferometric reception of ultrasonic energy |
| 07/28/1987 | US4683374 Method and means for multiplexing optical sensors |
| 07/16/1987 | WO1987004258A1 System for marine seismic exploration |
| 07/14/1987 | US4679436 Reciprocating method and apparatus for producing uniform ultrasonic field for use in liquid crystal based acoustical imaging |
| 07/07/1987 | CA1223954A1 Optical fibre hydrophone |
| 05/26/1987 | US4668093 Optical grating demodulator and sensor system |
| 05/20/1987 | EP0222346A2 Method of measuring a sound pressure distribution in a solid body due to a ultrasonic probe by using photoelasticity |
| 05/05/1987 | US4662225 Seismic detector |
| 04/23/1987 | WO1987002453A1 Sensing system using fibre optic sensors |
| 04/22/1987 | EP0219187A1 Non-coherent frequency source and sector scanning apparatus for ultrasonic imaging system using a liquid crystal detector cell |
| 04/21/1987 | US4659224 Optical interferometric reception of ultrasonic energy |
| 04/08/1987 | EP0216812A1 A measuring device. |
| 04/07/1987 | US4655086 Method and means for measuring sound intensity |
| 04/01/1987 | EP0216565A2 Improvements relating to optical devices |
| 03/31/1987 | US4653916 Optical sensing systems |