G01H 15 - Measuring mechanical or acoustic impedance

Patents for G01H 15 - Measuring mechanical or acoustic impedance (236)
10/1990
10/20/1990	CA2014961A1 Ice detecting apparatus and methods
06/1989
06/21/1989	EP0321146A2 Apparatus and method for sensing acoustic reflections
12/1988
12/01/1988	EP0276283A4 Method and apparatus for determining flow resistance of fully assembled acoustic liners.
10/1988
10/04/1988	US4775960 Method and device for measuring vibrational stresses and velocities of waves propagated within formations surrounding a wellbore
09/1988
09/06/1988	US4768379 Method and apparatus for determining flow resistance of fully assembled acoustic liners
08/1988
08/03/1988	EP0276283A1 Method and apparatus for determining flow resistance of fully assembled acoustic liners
06/1988
06/07/1988	US4750157 Seismic vibrator earth impedance determination and compensation system
03/1988
03/22/1988	US4732039 For measuring a curved material
02/1988
02/11/1988	WO1988001056A1 Method and apparatus for determining flow resistance of fully assembled acoustic liners
02/11/1988	DE3626558A1 Method for determining soundproofing defects on enclosures of the noise emitter
10/1987
10/31/1987	CN86208385U Road surface cleaning apparatus with dust collecting box
09/1987
09/30/1987	CN87102652A Apparatus and method for ultrasound detection
08/1987
08/26/1987	EP0233676A1 Apparatus for ultrasound detection
03/1987
03/24/1987	US4651566 Portable impedance meter for non-destructive testing of sound absorbing panels
02/1986
02/18/1986	US4571693 Acoustic device for measuring fluid properties
08/1985
08/27/1985	US4537630 Using open-ended tube
09/1984
09/25/1984	US4473822 Method of and a device for sensing objects
05/1984
05/01/1984	US4445378 Acoustic ground impedance meter
04/1984
04/17/1984	CA1165856A1 Precision ultrasound measurement
02/1984
02/07/1984	US4429702 Apparatus for measurement of acoustic volume
12/1983
12/06/1983	US4418573 Method for measuring material characteristics
09/1983
09/13/1983	US4403508 Locating interfaces in vertically-layered materials and determining concentrations in mixed materials utilizing acoustic impedance measurements
06/1983
06/28/1983	US4389893 Precision ultrasound attenuation measurement
12/1982
12/08/1982	EP0066343A1 Method and apparatus for measuring ultrasonic attenuation characteristics
04/1982
04/27/1982	US4326416 Acoustic pulse response measuring
03/1982
03/30/1982	US4322806 Frequency response analyzer
03/23/1982	US4320659 Ultrasonic system for measuring fluid impedance or liquid level
12/1981
12/15/1981	US4305295 Portable apparatus for measuring acoustic impedance at the surface of curved sound absorber
11/1981
11/11/1981	EP0039353A1 Inspection of solder joints by acoustic impedance
09/1981
09/15/1981	US4289143 Method of and apparatus for audiometrically determining the acoustic impedance of a human ear
09/08/1981	US4287766 Inspection of solder joints by acoustic impedance
04/1981
04/02/1981	WO1981000910A1 Inspection of solder joints by acoustic impedance
08/1980
08/20/1980	EP0014324A2 Device for measuring the acoustical ear impedance
09/1979
09/04/1979	US4166377 Apparatus for measuring the damping coefficient of torsional-vibration dampers
03/1978
03/14/1978	US4079198 Electro-acoustic impedance bridges
05/1976
05/11/1976	US3955404 Resonant sensing device

1 2 3