| 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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| 04/24/1990 | US4918990 Ultrasonic transducer assembly |
| 04/18/1990 | CN2056245U Electromechanical-integrated detecting unit for measuring mechanical vibration |
| 04/17/1990 | US4918032 Method for fabricating three-dimensional microstructures and a high-sensitivity integrated vibration sensor using such microstructures |
| 04/17/1990 | CA1267950A1 Method and circuit arrangement for measuring the dynamical behavior of a rotating body |
| 04/10/1990 | US4916350 Sensor for detecting vibrations in a plane, particularly in a stringed musical instrument |
| 03/20/1990 | US4909082 Acoustic transducer for acoustic microscopy |
| 03/13/1990 | US4908536 Vibration suppressing by electrical termination impedance |
| 03/08/1990 | WO1990002346A1 Ultrasonic transducer and method |
| 03/07/1990 | EP0357268A2 Multicomponent transducer |
| 03/06/1990 | US4905517 Multicomponent transducer |
| 02/22/1990 | WO1990001712A1 A geophone system |
| 02/21/1990 | CN1006909B Photoelectric vibration measurer for spindle |
| 02/20/1990 | US4901573 Integral structural component vibratory behavior control |
| 02/20/1990 | CA1266119A1 Coaxial cable |
| 02/08/1990 | WO1990001163A1 Converter for recording acoustic emission signals |
| 02/07/1990 | CN1039482A Turbine blade vibration detection system |
| 01/10/1990 | CN2050972U Harmonic vibration type supersonic sensor for air leakage testing |
| 01/10/1990 | CN1038700A Apparatus for precise detection of blade passing times |
| 01/10/1990 | CN1006407B Narrow frequency band supersonic leak detector |
| 01/04/1990 | DE3821655A1 Electromechanical pickup for structure-borne sound |
| 01/03/1990 | CN2050596U Hand digital oscillation meter |
| 12/26/1989 | US4888991 Relative motion sensor |
| 12/20/1989 | CN2049768U Checker for machine failure |
| 12/19/1989 | US4888086 Ultrasonic method |
| 12/12/1989 | US4887246 Ultrasonic apparatus, system and method |
| 12/05/1989 | US4885781 Frequency-selective sound transducer |
| 11/30/1989 | WO1989011636A1 Improvements in or relating to electro-magnetically operable devices |
| 11/29/1989 | CN2048578U Field cross wave mini energy changing device |
| 11/22/1989 | CN1037369A Photoelectric vibration measurer for spindle |
| 10/17/1989 | US4873871 Mechanical field effect transistor sensor |
| 10/10/1989 | US4872348 Signal added vibration transducer |
| 10/04/1989 | EP0334988A2 Vibration detector |
| 10/03/1989 | US4872148 Ultrasonic transducer for use in a corrosive/abrasive environment |
| 09/26/1989 | US4869095 Vibration detecting device |
| 09/05/1989 | US4864288 Hall effect motion detector responsive to dual frequency stimuli |
| 08/29/1989 | US4862430 Wide pass band elastic wave omnidirectional transducer |
| 08/02/1989 | CN1034429A Capacitance-type vibration sensor |
| 07/26/1989 | CN1034267A Narrow frequency band supersonic leak detector |
| 07/19/1989 | EP0324187A2 Vibration sensor |
| 07/19/1989 | CN1034057A Using electret microphone as supersonic sensor |
| 07/12/1989 | CN2041035U Popular electronic tone-setting device |
| 07/05/1989 | CN1033729A Acoustic emission transducer and electrical oscillator |
| 06/21/1989 | CN1033503A Acoustic emission transducer and electrical oscillator |
| 06/20/1989 | US4840183 Electrocardiograph |
| 06/15/1989 | WO1989005558A1 Ultrasonic transducer with tensioned diaphragm and method |
| 06/15/1989 | WO1989005445A1 An acoustic emission transducer and an electrical oscillator |
| 06/15/1989 | WO1989005199A1 An acoustic emission transducer and an electrical oscillator |
| 05/30/1989 | US4835747 Compensating sensor device for a charge amplifier circuit used in piezoelectric hydrophones |
| 05/16/1989 | US4830451 Technique and apparatus for fabricating a fiber Fabry-Perot etalon |
| 04/26/1989 | EP0313367A2 Monitoring of exciter shaft torsional vibrations |
| 04/26/1989 | CN1032586A Monitoring of exciter shaft torsional vibrations |
| 04/25/1989 | US4823602 Accelerometer mounting device |
| 04/12/1989 | CN2035878U Contact micro vibration sensor |
| 04/11/1989 | US4821245 Electromagnetic transducer |
| 03/29/1989 | CN1032068A Steam trap operation detector |
| 03/28/1989 | US4816743 Measuring method |
| 03/28/1989 | US4816725 Method and apparatus for suppressing vibration |
| 03/15/1989 | CN1031760A On-line cutting-vibration measuring instrument |
| 02/28/1989 | US4809244 Support member for pressure sensor |
| 02/28/1989 | CA1250458A1 Hemispherical resonator gyro |
| 02/15/1989 | EP0303547A1 Omnidirectional wide-band elastic wave transducer |
| 02/07/1989 | US4803671 Sensor for acoustic shockwave pulses |
| 02/07/1989 | CA1249877A1 Ultrasonic apparatus, system and method |
| 01/10/1989 | US4796725 Electrostatic transducer |
| 01/10/1989 | US4796509 Electronic tuning apparatus |
| 01/03/1989 | US4796026 Noise tool and method |
| 01/03/1989 | US4795935 Ultrasonic transducer |
| 12/27/1988 | US4794295 Acoustic transducer |
| 12/27/1988 | US4793186 Monitoring of exciter shaft torsional vibrations |
| 12/22/1988 | DE3718604A1 Ultrasonic sensor having a polymer film and electrolytic electrode coupling |
| 12/01/1988 | DE3716620A1 Device for detecting vibrations |
| 11/30/1988 | CN88200469U Acoustic controlled anti-thief monitor |
| 11/17/1988 | WO1988008964A1 Detonation detector |
| 11/15/1988 | US4784154 Interference resistant biomedical transducer |
| 11/09/1988 | CN87214610U Acoustic emission (ae) sensor |
| 11/01/1988 | US4782471 Omnidirectional transducer of elastic waves with a wide pass band and production process |
| 10/19/1988 | EP0287443A1 Method for the compensation of a charge amplifier circuit, in particular for a piezoelectric hydrophone |
| 09/22/1988 | DE3707988A1 Fishing tackle |
| 09/07/1988 | CN88201027U Remote measuring device for vibration characters of blade |
| 09/06/1988 | US4769793 Method for detecting the distance to an object |
| 09/06/1988 | US4769594 Method and circuit arrangement for measuring the dynamical behavior of a rotating body |
| 08/30/1988 | US4768173 Pressure wave sensing device of the piezoelectric type with continuous structure and a method of manufacturing same |
| 08/30/1988 | US4766771 Variable unbalanced rotating mechanism |
| 08/23/1988 | CA1241088A1 Vibration sensor and the method of and apparatus for manufacture thereof |
| 08/18/1988 | DE3703946A1 Frequency-selective vibration sensor |
| 08/16/1988 | US4764908 For use within a motion sensor |
| 08/16/1988 | US4764905 Ultrasonic transducer for the determination of the acoustic power of a focused ultrasonic field |
| 08/16/1988 | US4764760 Automatic gain control for machine tool monitor |
| 08/10/1988 | EP0277785A2 Acoustic transducer |
| 08/02/1988 | US4761770 Method of detecting the position of objects |
| 07/26/1988 | US4760295 Vibration-sensitive transducer |
| 07/19/1988 | US4757717 Apparatus and method for measuring vibration of a rotating member |
| 07/12/1988 | US4756192 Shock wave sensor |
| 06/22/1988 | EP0272244A2 Method and device for determining vibration characteristics and for driving a piezoelectric transducer |
| 06/22/1988 | CN87214409U Handy insect measurer |
| 06/21/1988 | US4751848 Vibration sensor |
| 06/07/1988 | US4749056 Sensor of the theft and the like of an automobile |
| 03/10/1988 | DE3726467A1 Oscillation element injection-encapsulated with an appropriately resistant plastic |
| 02/16/1988 | US4725994 Ultrasonic transducer with a multiple-folded piezoelectric polymer film |
| 02/10/1988 | EP0255636A1 Acoustic shock wave sensor |