| Patents for G01H 3 - Measuring vibrations by using a detector in a fluid (2,243) |
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| 02/04/1992 | US5085081 Ultrasonic imaging apparatus without phase distortion |
| 01/14/1992 | US5079952 Ultrasonic transducer assembly and ultrasonic acoustic microscope |
| 01/11/1992 | CA2020795A1 Apparatus for detecting and indicating when a body falls in the water |
| 12/26/1991 | WO1991019459A1 Method for monitoring the effectiveness of pressure waves from a pressure wave generator |
| 12/22/1991 | WO1991019989A1 Method and apparatus for wave analysis and event recognition |
| 12/22/1991 | CA2085887A1 Method and apparatus for wave analysis and event recognition |
| 12/18/1991 | CN1057107A 超声功率计 Ultrasonic Power Meter |
| 12/17/1991 | USRE33771 Visualizing method for three dimensional standing wave sound field |
| 12/12/1991 | DE4017936A1 Measuring probe for sound intensity determination - has at least four spatially distributed individual microphones, with output voltages determining acoustic pressure |
| 12/10/1991 | US5072415 Method and microprocessor-based apparatus for directly measuring a particular index for the evaluation of the environmental noise pollution |
| 11/26/1991 | US5068834 Method and device for correcting the signals given by the hydrophones of an antenna |
| 11/13/1991 | EP0456520A1 An apparatus for detecting intensity and/or density of shot blasting |
| 10/23/1991 | EP0453293A2 Sound field variable apparatus |
| 10/23/1991 | CN1014464B Apparatus and method for ultrasound detection |
| 10/22/1991 | US5060201 Probe for ultrasonic microscope |
| 10/08/1991 | US5056069 Ultrasonic sensor |
| 10/08/1991 | US5054310 Test object and method of measurement of an ultrasonic beam |
| 10/01/1991 | US5054039 Digital calibration circuit employing composite sine wave signals |
| 10/01/1991 | US5053747 Ultrasonic air-in-line detector self-test technique |
| 09/25/1991 | EP0448121A2 Electronic noise attenuation method and apparatus for use in effecting such method |
| 09/11/1991 | EP0445907A2 A collision detector for a vehicle |
| 08/27/1991 | US5042304 Ultrasonic microscope |
| 08/27/1991 | US5042303 Apparatus for ultrasound detection |
| 08/21/1991 | EP0442207A1 A method and apparatus for testing the response of a stress wave sensor |
| 08/20/1991 | US5041752 Apparatus for detecting and signalling the fall of bodies in water, particularly swimming pools |
| 07/25/1991 | WO1991010905A1 Areal sound intensity receiver |
| 06/26/1991 | EP0433652A2 Method and apparatus for compensation of sensitivity variations |
| 06/11/1991 | US5023847 Boom event analyzer recorder |
| 05/15/1991 | EP0426761A1 Acoustic field transducers. |
| 05/08/1991 | EP0426276A2 Transducer testing |
| 04/23/1991 | US5010525 Sonar test system and method |
| 04/02/1991 | US5004985 Method and apparatus for testing the response of a stress wave sensor |
| 03/26/1991 | US5001933 Micromechanical vibration sensor |
| 03/21/1991 | DE3929077A1 Acoustic identification and classification of helicopters - using mathematical model transforming ambient noise into frequency domain and identifying rotor frequency ratio from power spectrum |
| 03/20/1991 | EP0296588B1 Method and circuit arrangement for the automatic recognition of signal sequences |
| 03/13/1991 | EP0416911A2 Ultrasonic air-in-line detector self-test technique |
| 02/28/1991 | DE3927840A1 Arrangement for measuring sound incidence levels - has rule or tape with scale enabling sound level to be determined from distance from source |
| 02/13/1991 | EP0412902A2 Electroacoustic device for hearing needs including noise cancellation |
| 02/11/1991 | CA2022888A1 Electroacoustic device for hearing needs including noise cancellation |
| 01/29/1991 | US4988979 Fault inspection system for rotary machines |
| 01/22/1991 | US4986125 Ultrasonic microscope |
| 01/03/1991 | DE3920885A1 Ultrasonic shock wave sensor - with non-piezoelectric polymeric dielectric, for lithotriptor |
| 01/01/1991 | US4982375 Acoustic intensity probe |
| 12/18/1990 | US4977779 Ultrasonic microscope having a focusing mechanism |
| 12/13/1990 | DE3919049A1 Spectacles with integral deaf aid vol. control - has visual indicator of acoustic loudness measured by integral or separate microphone |
| 12/11/1990 | US4977544 Ultrasonic microscope |
| 12/05/1990 | EP0401073A1 Process and device for correcting hydrophone signals from an antenna and sonar antenna using this device |
| 11/29/1990 | WO1990014739A1 Analysis of waveforms |
| 11/29/1990 | WO1990014656A1 Apparatus and methods for the generation of stabilised images from waveforms |
| 11/22/1990 | EP0398428A2 Probe for ultrasonic microscope |
| 11/01/1990 | WO1990012658A1 Process for manufacturing an acoustic sensor with an essentially non-detachable protective layer, and acoustic sensor so obtained |
| 10/31/1990 | DE3913786A1 Contact-free monitoring sonic emission - from workpieces during high energy beam working, using plate transparent to high energy beam attached to sonic sensor |
| 10/24/1990 | EP0393828A2 A method and apparatus for testing the response of a stress wave sensor |
| 10/16/1990 | US4962752 Coupling member for a shock wave therapy device |
| 10/03/1990 | EP0389953A2 Ultrasound generator assembly and ultrasonic acoustic microscope |
| 10/02/1990 | US4960970 Method and apparatus for acoustic breakthrough detection |
| 10/02/1990 | US4959992 Piezo-electric transducer test apparatus |
| 09/25/1990 | US4959638 Combustion efficiency analyzer, acoustic |
| 09/25/1990 | CA1274618A1 Finding the direction of a sound |
| 09/12/1990 | EP0386820A1 Method and arrangement for probabilistic pitch measuring |
| 09/11/1990 | US4955366 Ultrasonic therapeutical apparatus |
| 09/05/1990 | EP0385897A1 Microechographic probe using ultrasound focusing through a deformable surface |
| 09/04/1990 | US4955001 Areal sound intensity receiver |
| 08/22/1990 | EP0383649A1 Apparatus for detecting and signalling articles dropping into the water |
| 08/21/1990 | US4950936 Piezoelectric sandwich polymer transducer |
| 08/21/1990 | US4949580 Audio analysis system |
| 08/16/1990 | EP0381796A1 Ultrasonic sensor |
| 08/02/1990 | DE4001202A1 Ultrasonic microscope for testing surfaces of specimens mounted on rod |
| 08/01/1990 | EP0380310A2 An acoustic analysis device and a frequency conversion device used therefor |
| 07/18/1990 | CN1008831B Apparatus for ultrasonically inspecting large shaft from luguid-filled bose |
| 07/17/1990 | US4942614 Calibration of ultrasonic transducers |
| 06/26/1990 | CA1270938A1 Apparatus for ultrasonicly inspecting a large shaft from a liquid-filled bore |
| 06/19/1990 | US4935908 Finding the direction of a sound |
| 06/13/1990 | EP0372060A1 An acoustic screen scan microscope for the examination of an object in the short-range field of a resonant acoustic oscillator. |
| 06/12/1990 | US4932250 Multi point sensor |
| 05/23/1990 | DE3839343A1 Ultrasound camera |
| 05/08/1990 | US4924508 Pitch detection for use in a predictive speech coder |
| 05/01/1990 | US4920803 Ultrasonic microscope apparatus |
| 04/24/1990 | CA1268246A1 Audio cartography device |
| 04/17/1990 | US4918730 Process and circuit arrangement for the automatic recognition of signal sequences |
| 04/05/1990 | DE3832431A1 Method and measuring device for the determination of the attenuation properties of sound absorbing installations |
| 03/27/1990 | US4910838 Method for providing a desired sound field as well as an ultrasonic transducer for carrying out the method |
| 03/21/1990 | EP0358904A2 Method and system for dual phase scanning acoustic microscopy |
| 03/20/1990 | US4910512 Monitoring equipment for the safety devices used in vehicles when driving in reverse |
| 02/27/1990 | US4903523 Test object and method of characterization of an ultrasonic beam and its side lobes |
| 02/20/1990 | US4903249 Rigid foraminous microphone probe for acoustic measurement in turbulent flow |
| 01/25/1990 | WO1990000730A1 Acoustic field transducers |
| 01/16/1990 | US4894806 Ultrasonic imaging system using bundle of acoustic waveguides |
| 12/28/1989 | WO1989012805A1 An acoustic screen scan microscope for the examination of an object in the short-range field of a resonant acoustic oscillator |
| 12/05/1989 | US4885781 Frequency-selective sound transducer |
| 11/30/1989 | WO1989011636A1 Improvements in or relating to electro-magnetically operable devices |
| 11/29/1989 | EP0343969A2 Ultrasound diagnostic equipment |
| 11/29/1989 | CN1037589A Detecting method and apparatus of weak vibration |
| 11/14/1989 | US4879895 Normal shock locator |
| 11/02/1989 | EP0339823A2 Piezo-electric transducer test apparatus |
| 11/01/1989 | CN1005676B Meter and measurement of harmonic distortion under great power of louderspeaker |
| 10/31/1989 | US4878210 Visualizing method for three dimensional standing wave sound field |
| 10/24/1989 | US4876721 Method and device for identifying different species of honeybees |
| 10/11/1989 | EP0336085A1 Cible |
| 09/26/1989 | CA1260132A1 Surface acoustic wave spectrum analyzer |