| Patents for G01H 11 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties (3,253) |
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| 12/15/1992 | US5172345 Geophone system |
| 12/08/1992 | US5168758 Force/strain and structure-borne noise transducer |
| 12/02/1992 | EP0515443A1 Optical test apparatus. |
| 12/01/1992 | CA1311030C Turbine blade vibration detection system |
| 11/25/1992 | EP0514395A1 Crystal-oriented motion sensor and process for manufacturing it |
| 11/25/1992 | CN2123067U Magnet-adjustable sound emission transducer stationary clamp bed |
| 11/24/1992 | US5166612 Micromechanical sensor employing a squid to detect movement |
| 11/17/1992 | US5164920 Composite ultrasound transducer and method for manufacturing a structured component therefor of piezoelectric ceramic |
| 11/10/1992 | US5161414 Magnetically shielded apparatus for sensing vibration |
| 11/04/1992 | EP0511762A2 Piezoelectric sensor |
| 11/03/1992 | CA2041723A1 Fiber-optic piezoelectric devices |
| 10/28/1992 | CN1018862B Apparatus for precise detection of blade passing times |
| 10/21/1992 | EP0509800A2 A pressure measurement apparatus for inspecting therapeutic energy waves |
| 10/13/1992 | US5155708 Acoustic wave sensor and method of making same |
| 09/29/1992 | US5151763 Acceleration and vibration sensor and method of making the same |
| 09/29/1992 | US5150606 Acceleration detector |
| 09/08/1992 | US5146435 Acoustic transducer |
| 07/29/1992 | CN2111519U Rotor sound-electric signal transmiting device |
| 07/05/1992 | WO1992012441A1 Sensor for detecting vibration in two orthogonal directions |
| 07/05/1992 | CA2081362A1 Two orthogonal directions vibration sensor |
| 06/17/1992 | CN2107650U Pocket vibration testing measuring controlled by microcomputer |
| 06/02/1992 | US5119343 Transducers for acoustic logging tool |
| 05/06/1992 | EP0483603A2 Pressure pulse source |
| 04/16/1992 | DE4032550A1 Vibration analysis arrangement e.g. for vehicle - contains tetrade pressure sensors arranged around rail with restraining spring in housing |
| 04/02/1992 | DE4131948A1 Vibration part for ultrasonic motor - has two drive vibrators arranged at distance from each other and two sensors mutually spaced at preset distance |
| 03/31/1992 | CA1298283C Shaking apparatus |
| 02/12/1992 | EP0470639A2 Acoustic-emission sensor |
| 02/11/1992 | CA2048866A1 Acoustic-emission sensor |
| 01/29/1992 | EP0467980A1 Process and device for measuring vibrations, in particular nervous trembling in living organisms. |
| 01/28/1992 | CA1295033C Monitoring of exciter shaft torsional vibrations |
| 12/27/1991 | EP0462311A1 Composite ultrasound transducer and fabrication process of a structured component from piezoelectric ceramic |
| 12/04/1991 | EP0459948A2 Receiver-combination for force, elongation and sound conducted through solids |
| 12/03/1991 | US5069071 Vibration monitoring in the frequency domain with a capacitive accelerometer |
| 11/12/1991 | US5065372 Sonar transducer with explosive shock protector |
| 10/31/1991 | DE4113784A1 Vibration sensor esp. for IC engine knock detection - has piezoelectric element and vibration plate in housing with plastic sealing cover |
| 10/08/1991 | US5054322 Piezo electric relative motion sensor |
| 10/03/1991 | WO1991015089A1 Transducers for acoustic logging tool |
| 09/11/1991 | CN2084612U 微型振动传感器 Micro-vibration sensor |
| 09/10/1991 | CA1288612C Support member for pressure sensor |
| 09/04/1991 | CN1013808B Monitoring and method for exciter shaft torsional vibrations |
| 08/22/1991 | WO1991012497A1 Crystal-oriented motion sensor and process for manufacturing it |
| 08/21/1991 | CN2083297U Ultrasonic photoelectric sensor for local discharge of electrical equipment |
| 08/20/1991 | CA1287903C Steam trap operation detector |
| 08/16/1991 | WO1991012509A1 Optical test apparatus |
| 08/08/1991 | DE4003473A1 Kristallorientierter bewegungssensor und verfahren zu dessen herstellung Crystal-oriented motion sensor and process for its manufacture |
| 07/31/1991 | EP0205609B1 Acceleration responsive transducers |
| 07/24/1991 | CN2081529U Omnibearing vibrating sensor |
| 07/23/1991 | US5034729 Vibration monitor for rotating or moving equipment |
| 07/03/1991 | EP0434878A1 Vibration/acceleration sensor |
| 07/03/1991 | EP0434702A1 A geophone system. |
| 06/19/1991 | CN2079289U Logarithm ratio glottis sounding effect measuring device |
| 06/05/1991 | CN1051976A Mechano-electrically integrated measuring unit for mechanical vibration |
| 06/04/1991 | US5021737 Proximity sensor resistant to axial and torsional forces |
| 05/14/1991 | US5015949 Steam turbine blade arrival time processor with automatic gain control |
| 05/14/1991 | CA1284238C2 Method of treating an ultrasonic transducer element |
| 05/14/1991 | CA1284210C Acoustic transducer |
| 04/16/1991 | US5007292 Multicomponent transducer |
| 04/02/1991 | US5003824 Vibration/acceleration sensor |
| 03/27/1991 | EP0418663A1 Piezoelectric membrane hydrophone |
| 03/26/1991 | US5003517 Magnetohydrodynamic fluid apparatus and method |
| 03/26/1991 | US5001933 Micromechanical vibration sensor |
| 03/19/1991 | US5001682 Method and apparatus for detecting seismic events |
| 03/12/1991 | CA1281408C Variflux vibration transducer |
| 02/19/1991 | US4995014 Low frequency hydrophone and depth sensor assembly |
| 02/13/1991 | CN1011624B Sonic system for monitoring the trajectory of a projectile |
| 02/12/1991 | US4991439 Apparatus for detecting insect-induced vibrations in particulate matter |
| 02/07/1991 | DE4024339A1 Acceleration detector sensing IC engine knocking - has piezoelectric element, inertial wt. and output terminal stacked in cylindrical transducer element |
| 02/05/1991 | US4991150 Dynamic mechanical stress trnasducer |
| 01/16/1991 | CN1048595A Kind of directly conversion circuit for logarithmic analogue-digital |
| 01/08/1991 | CA1278715C Fiber fabry-perot etalon |
| 01/03/1991 | DE3920885A1 Ultrasonic shock wave sensor - with non-piezoelectric polymeric dielectric, for lithotriptor |
| 12/25/1990 | US4980873 Ultrasonic transducer with tensioned diaphragm and method |
| 12/18/1990 | US4978883 Vibration detecting device |
| 12/18/1990 | CA1278082C Pressure wave sensing device of the continuous structure piezoelectric type and method for fabricating said device |
| 12/12/1990 | CN2067403U Impact energy standardization test apparatus |
| 11/28/1990 | CN2066575U Flexible high sensitive hydrophone |
| 11/27/1990 | US4972713 Sensor of the theft and the like of automobiles |
| 11/22/1990 | DE4014199A1 Ultrasonic transducer for measuring gas flow speeds - has piezoelectric ceramic plate with quarter-wave transformation film consisting bubbled glass |
| 11/07/1990 | CN1010344B Steam trap operation detector |
| 10/30/1990 | US4966031 Vibration sensor |
| 10/24/1990 | CN2064503U Multi-functioned viberation pickup devices with the feature of alternating motion and no power-sourced servo |
| 10/23/1990 | US4965778 Helical magnetostrictive core line hydrophone |
| 10/18/1990 | WO1990012293A1 Process and device for measuring vibrations, in particular nervous trembling in living organisms |
| 10/04/1990 | DE3910200A1 Device for measuring ultrasonic amplitudes |
| 09/25/1990 | CA1274619A1 Ultrasonic transducer for use in a corrosive/abrasive environment |
| 09/19/1990 | CN2062441U Pouring shaping piezoelectric high polymer hydrophone vibrator |
| 09/05/1990 | EP0385575A2 Proximity sensor and method of making |
| 09/02/1990 | CA2008492A1 Proximity sensor and method of making |
| 08/22/1990 | CN1044855A Turbine blade arrival time processor |
| 08/21/1990 | US4949571 Acceleration detector |
| 08/15/1990 | CN2060545U Non-contact microcomputerized monitoring device for the vibration of turbine blades |
| 08/15/1990 | CN2060543U 防噪传声器 Noise canceling microphone |
| 08/14/1990 | US4949316 Acoustic logging tool transducers |
| 07/31/1990 | US4944179 Vibration detector |
| 06/22/1990 | CA2006286A1 Turbine blade arrival time processor |
| 06/19/1990 | US4934192 Turbine blade vibration detection system |
| 05/31/1990 | DE3524130A1 Monitoring device |
| 05/22/1990 | US4927299 Integral acoustic emission sensor for manufacturing processes and mechanical components |
| 05/08/1990 | US4922757 Apparatus for precise detection of blade passing times in a steam turbine |
| 05/01/1990 | US4921346 Tunnel current detecting photo-acoustic spectrometer |