Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 4297885 | Acoustic emission for detection and monitoring of crack initiation and propagation in materials Initiation and propagation of cracks in materials is detected and monitored by (a) adhering an acoustical emitter to the area of the material to be monitored, and (b) monitoring for acoustical signals emitted by the adhered emitter, said signals produced ... | 11/03/1981 |
| 4292847 | Testing the material of a product for defects therein and processing the material employing such a method A method of testing a product for the detection of the presence therein of a defect such as a void or an inclusion, comprises cutting the product and examining the resultant noise for the presence therein of an acoustic component representative of the pre... | 10/06/1981 |
| 4277977 | Method and apparatus for inspection of ceramic parts for defects A method and apparatus for inspection of ceramic parts for defects utilizes the application of an electrical test voltage to the part to be inspected, and at the same time subjecting the part to acoustic emission analysis. Use of the acoustic emission ana... | 07/14/1981 |
| 4269065 | Ultrasonic detector apparatus A non-destructive test apparatus for obtaining advance warning of impending mechanical failure by the detection and analysis of ultrasonic frequency signals which are generated internally by the equipment being tested. The detector apparatus of the presen... | 05/26/1981 |
| 4207771 | Method and apparatus for monitoring cracking using stress wave emission techniques The disclosure is directed to a technique for monitoring signals emanating from a ceramic article (10) during a soldering operation. In order to determine whether the signals are stress wave emissions (SWE's) or noise the number of pulses (41) of the moni... | 06/17/1980 |
| 4201092 | Method of detecting and monitoring a leak caused by a through wall crack in a high pressure fluid system A method of detecting and monitoring leaks in the piping of a nuclear reactor senses the acoustic energy from the leak and analyzes its frequency spectrum versus acoustic amplitude. A choke flow condition will exist where the leak flows at sonic velocity;... | 05/06/1980 |
| 4144766 | Apparatus for the in-situ detection and location of flaws in welds Apparatus for the on-line detection and location of weld flaws wherein the acoustic emissions from a fault are segregated from other acoustic emissions by recognizing those emissions from the weld zone falling within a predetermined band of frequencies an... | 03/20/1979 |
| 4140021 | Method and device for monitoring superconducting system The explosion or destruction of a superconducting system which may occur when an abnormal state arises in any part of the system if allowed to develop into a catastrophic quenching is prevented by providing the system with an acoustic wave detecting devic... | 02/20/1979 |
| 4114063 | Piezoelectric sediment particle transport detector A sand transport detector which detects the discrete impingements of sand particles on an elongated probe member inserted into the sand. A piezoelectric transducer element is cemented to the probe and produces an output signal when impingement occurs. Wit... | 09/12/1978 |
| 4107981 | Method of estimating ground pressure A method of estimating ground pressure in rock samples by making use of the Kaiser effect of acoustic emission. The method comprises the steps of applying load to a rock sample, increasing the load and counting the summation of the acoustic emissions prod... | 08/22/1978 |
| 4089224 | Acoustic emission fatigue analyzer A device for acquiring and displaying acoustic emission fatigue data so as to facilitate the interpretation of dynamic micromechanical failure processes in materials. The load on a specimen under cyclic loading is monitored by a load cell whose output is ... | 05/16/1978 |
| 4088907 | Piezoelectric acoustic emission instrumentation A detector of acoustic emissions from a structure includes a piezoelectric element responsive to both compressional wave energy and to shear wave energy from any direction so that the source of the acoustic emission may be determined.... | 05/09/1978 |
| 4086817 | Method and apparatus for determining the acceptability of a weld formed by applying repetitive pulses of energy to the weld site Stress wave emission signals emanating from a weld during an AC welding operation are detected during (1) the time when the AC power is on, (2) the post weld time period, and (3) during each half-cycle of the AC weld when the absolute magnitude of the cur... | 05/02/1978 |
| 4086816 | Method and apparatus for distinguishing stress wave emissions from mechanical noise Signals emanating from a weld are detected during the post weld period and excursions of the detected signal above a predetermined threshold are counted. Simultaneously, an envelope of the signal is developed and excursions thereof above the threshold are... | 05/02/1978 |
| 4043176 | Acoustic white noise generator A narrow banded acoustic transducer is driven by a VCFO whose output is varied by input signals of variable amplitude. One can simulate acoustic emissions for purposes of calibrating transducers which monitor a structural part for such emissions. Differen... | 08/23/1977 |
| 4039376 | Method and apparatus for inspection of nuclear fuel rods A method and apparatus are provided for the inspection of nuclear fuel rods to detect defects or failures in such rods. Assemblies of fuel rods are immersed in water and means are provided for causing a change in the relative pressures in the water and wi... | 08/02/1977 |
| 4039767 | Acoustic emission transducer calibration A method of calibrating acoustic emission transducers. The sensitivity of a standard transducer is first determined utilizing a reciprocity calibration technique, and the standard transducer and the acoustic emission transducer are then connected to a bou... | 08/02/1977 |
| 4036057 | Automatic threshold control means and the use thereof A threshold actuated information detection system comprising a noise level converter, and a non-inverting voltage totalizer, and a voltage comparator interconnected such that the comparator will not trigger any logic circuit if an amplified signal is lowe... | 07/19/1977 |
| 4033179 | Acoustic emission monitoring system Methods and apparatus for identifying the source location of acoustic emissions generated within an acoustically conductive medium. A plurality of acoustic receivers are communicably coupled to the surface of the medium at a corresponding number of spaced... | 07/05/1977 |
| 4024522 | Acoustic emission system for welding flaw detection A system for flaw detection during a continuous welding process uses a transducer to provide a signal burst for each acoustic burst from an article being welded. The signal burst is amplified and filtered to pass frequencies between about 100 and about 55... | 05/17/1977 |
| 4018084 | Acoustic emissions simulator This device generates a simulated acoustic emission signal and simultaneously introduces the signal into a test article. The device provides a means for positioning precision brittle tubes or rods against the test article in a controlled fashion. A simula... | 04/19/1977 |
| 4011472 | Acoustic emission transducer The electromechanical acoustic emission detector of this invention comprises a plurality of sensor elements secured in an areal array on a base plate. The spacing and arrangement of the sensor elements are such that the transducer is "tuned" to acoustic e... | 03/08/1977 |
| 4009463 | Acoustic emission monitoring system Methods and apparatus for identifying the source location of acoustic emissions generated within or on an acoustically conductive medium segregated into a plurality of quadrilateral monitoring zones. A plurality of acoustic receivers are communicably coup... | 02/22/1977 |
| 4007631 | Method and apparatus for evaluating welds using stress-wave emission techniques Spot welds are evaluated using stress-wave emission techniques by measuring the stress-wave energy emitted from the weld area during n time intervals of the weld cycle, where nࣙ4. Each of the time intervals corresponds to a different aspect of the weld ... | 02/15/1977 |
| 4006625 | Amplitude sorting of oscillatory burst signals by sampling A method and apparatus for amplitude sorting of oscillatory burst signals is described in which the burst signal is detected to produce a burst envelope signal and an intermediate or midportion of such envelope signal is sampled to provide a sample pulse ... | 02/08/1977 |
| 4004456 | Method and apparatus for the real-time, non-destructive evaluation of adhesion bonds using stress-wave emission techniques The strength of an adhesion bond can be determined using stress-wave emission techniques. One method measures the stress-wave emitted from the bonding area during the compression phase of the formation of the bond and compares this measurement with a pred... | 01/25/1977 |
| 3985024 | Acoustic emission process and system for improved flaw source location An acoustic emission process and system for improved flaw source location employing spatial filtration. Masterslave discrimination, rise time discrimination, and/or coincidence detection are integrated into a multi-channel flaw source location system to r... | 10/12/1976 |
| 3969927 | Vibration measuring and the apparatus therefor A method of measuring the mechanical vibration of an object comprising contacting one of the surfaces of a piezoelectric element comprising a polarization treated polyvinylidene fluoride piezoelectric film having metal thin films as electrodes deposited o... | 07/20/1976 |
| 3965726 | Method and apparatus for the real-time evaluation of welds by emitted stress waves Spot welds are evaluated using stress-wave emission techniques by detecting and measuring the stress waves emitted from a weld area during a first solid-to-liquid phase transformation period and a second liquid-to-solid phase transformation period of the ... | 06/29/1976 |
| 3946600 | Acoustic emission method for detection and monitoring of corrosion A method for detecting and monitoring corrosion by sensing the spontaneous propagation of elastic waves produced in materials as the result of corrosion phenomena. Certain corrosion reactions generate elastic waves (sounds) which may be detected by suffic... | 03/30/1976 |
| 3946256 | System for generating or sensing transverse elastic bulk waves in solids A device for generating or sensing transverse elastic bulk waves in solids includes a piezoelectric material engaging a surface of the solid and having a two-fold axis or equivalent symmetry extending parallel to the surface of the solid. A pair of electr... | 03/23/1976 |
| 3930405 | Method and means for measuring acoustic emissions The detection of acoustic emissions emanating from an object is achieved with a capacitive transducer coupled to the object. The capacitive transducer is charged and then allowed to discharge with the rate of discharge being monitored. Oscillations in the... | 01/06/1976 |
