Istvan M Matay

41343026, Jan 16, 1979

Jan 13, 1978

5/869276

Istvan M. Matay - North Royalton OH

TRW, Inc. - Cleveland OH

G01N 2904

73612

A pulser circuit for providing electrical exciting pulses to a transducer in an ultrasonic testing apparatus in which a transducer transmits ultrasonic energy corresponding to the pulses into a test specimen. The pulser circuit includes a capacitor connected in series with a source of charging potential and a load impedance. A pair of switching transistors are connected in parallel and to the capacitor and the charging potential. A second switching transistor is connected directly across the capacitor. The first switching transistors turn on and cause the charged capacitor to develop the leading edge of a pulse across the load impedance. The leading edge turns on the second switching transistor which provides a direct discharge path for the capacitor and thereby shapes the pulse. Diode means is connected across the load impedance to assist in rapid recharging of the capacitor. The diode means is forward biased to provide a clamped reference potential for the pulse.

44119402, Oct 25, 1983

Apr 12, 1982

6/367277

Thomas Derkacs - Mayfield OH
Charles W. Fetheroff - Willowick OH
Istvan M. Matay - North Royalton OH
Istvan J. Toth - Richmond Heights OH

TRW Inc. - Cleveland OH

B64C 100
B32B 300
B32B 312

428 73

Although the method and apparatus of the present invention can be utilized to apply either a uniform or a nonuniform covering of material over many different workpieces, the apparatus (20) is advantageously utilized to apply a thermal barrier covering (64) to an airfoil (22) which is used in a turbine engine. The airfoil is held by a gripper assembly (86) while a spray gun (24) is effective to apply the covering over the airfoil. When a portion of the covering has been applied, a sensor (28) is utilized to detect the thickness of the covering. A control apparatus (32) compares the thickness of the covering of material which has been applied with the desired thickness and is subsequently effective to regulate the operation of the spray gun to adaptively apply a covering of a desired thickness with an accuracy of at least plus or minus 0. 0015 of an inch (1. 5 mils) despite unanticipated process variations.

43584713, Nov 9, 1982

Feb 26, 1981

6/238213

Thomas Derkacs - Mayfield OH
Charles W. Fetheroff - Willowick OH
Istvan M. Matay - North Royalton OH
Istvan J. Toth - Richmond Heights OH

TRW Inc. - Cleveland OH

B05D 112
B05D 104
B05D 106
B05D 102

427 9

Although the method and apparatus of the present invention can be utilized to apply either a uniform or a nonuniform covering of material over many different workpieces, the apparatus (20) is advantageously utilized to apply a thermal barrier covering (64) to an airfoil (22) which is used in a turbine engine. The airfoil is held by a gripper assembly (86) while a spray gun (24) is effective to apply the covering over the airfoil. When a portion of the covering has been applied, a sensor (28) is utilized to detect the thickness of the covering. A control apparatus (32) compares the thickness of the covering of material which has been applied with the desired thickness and is subsequently effective to regulate the operation of the spray gun to adaptively apply a covering of a desired thickness with an accuracy of at least plus or minus 0. 0015 inches (1. 5 mils) despite unanticipated process variations.

45677476, Feb 4, 1986

Jan 16, 1984

6/571317

Istvan M. Matay - North Royalton OH

TRW Inc. - Cleveland OH

G01N 2900

73 1DV

A tubular workpiece (10) undergoes axial and rotational movement relative to a collar (12) filled with an acoustically coupling medium (14). Longitudinal waves are emitted into the coupling medium and the workpiece from a first transducer (22) and acoustic echoes are received thereby. From the coupling medium travel times between the transducer and the surface of the workpiece, a contour reconstruction apparatus (58) reconstructs the peripheral contour of the workpiece. The workpiece travel times are stored in a memory (92) until the longitudinal velocity of the acoustic wave in the workpiece is determined. Transducers (24, 26) emit and detect a Rayleigh wave which travels around the workpiece circumference. A divider (80) divides the workpiece circumference as determined by the contour reconstruction apparatus by the Rayleigh wave travel time to determine the Rayleigh wave acoustic velocity. A multiplier (82) multiplies the Rayleigh wave velocity by a preselected Rayleigh wave to longitudinal wave ratio to determine the velocity of the longitudinal wave in the workpiece.

40044548, Jan 25, 1977

May 7, 1975

5/575460

Istvan M. Matay - North Royalton OH

TRW Inc. - Cleveland OH

G01N 2904

73 678R

An automatic distance amplitude correction device for automatically correcting for amplitude variations and signals caused by the attenuation of sound propagating through a test specimen wherein a signal is transmitted through a test specimen and the reflection is detected and furthermore, a through signal is detected after the signal has passed through the test specimen only a single time and utilized to provide improved automatic distance amplitude compensation.

39811840, Sep 21, 1976

May 7, 1975

5/575572

Istvan M. Matay - North Royalton OH

TRW Inc. - Cleveland OH

G01N 2904

73 678S

An automatic ultrasonic inspection system for automatically testing billets by the pulse reflection type of inspection and further utilizing an ultrasonic transducer for thru-transmission of energy for automatic distance-amplitude correction and including indexing means having an angular scan encoder and an axial scan encoder such that reflections obtained indicative of defects are accurately correlated with their three dimensional positions in the billets. A defect gate receives the reflections through the billet and if a defect meets a preset criteria such defect information is displayed and passed to a computer wherein the position of the defect is stored. The computer can provide various outputs such as alphanumeric-graphic display or printed outputs.

45234680, Jun 18, 1985

Oct 3, 1983

6/538627

Thomas Derkacs - Mayfield Village OH
Istvan M. Matay - North Royalton OH
Stephan D. Murphy - East Cleveland OH
John Touhalisky - Eastlake OH

TRW Inc. - Cleveland OH

G01N 2904

73598

A first array (A) of ultrasonic transducers transmits ultrasonic shear waves circumferentially around an examined cylindrical object (110). A second array (B) transmits ultrasonic shear waves axially along the examined object. Triggering pulses from a triggering amplifier (22) are switched by a multiplexer (24) to each individual transducer of the first and second arrays. As one of the transducers assumes the role of a transmitting transducer and transmits an ultrasonic wave, the other transducers of the first and second arrays assume a receiving mode to receive reflected ultrasonic components. A wave travel timer (26) measures the duration for an ultrasonic wave to be transmitted from the transmitting transducer to a defect and for a reflected component to propagate from the defect to the receiving transducer. A microprocessor (20) tri-angulates or otherwise computes the location and orientation of a reflective defect from the measured travel time, the spatial relationship of the transmitting and receiving transducers, and the direction of propagation of the transmitted ultrasonic wave.

46342737, Jan 6, 1987

Jun 8, 1984

6/618595

Ronald K. Farleman - Reminderville OH
Charles W. Fetheroff - Willowick OH
Istvan M. Matay - North Royalton OH

TRW Inc. - Cleveland OH

G01N 2188
G01B 1108

356 73

A method is provided to inspect a resiliently deflectable O-ring which tends to distort under the influence of its own weight. The O-ring is placed on a transparent support member with the central axis of the O-ring in a vertical orientation. Light is directed toward the O-ring and through the support member to cause the O-ring to cast a shadow. The distance between portions of the shadow cast by diametrically spaced apart portions of the O-ring indicate diametral measurements of the O-ring. The distance between radial edge portions of the shadow cast by the O-ring indicates the thickness of the O-ring. To detect surface flaws in the O-ring, light is directed against a small area on the surface of the O-ring while it is rotated. A variation in the characteristics of the reflected light indicates the presence of a flaw in the surface of the O-ring. To provide for scanning of inner and outer surface areas of the O-ring to detect surface flaws, the O-ring may be rotated about an axis which extends perpendicular to the central axis of the O-ring and is tangential to a circle through the center of the cross section of the O-ring.