Harold G Swartz

US Patent:

50798472, Jan 14, 1992

Filed:

May 22, 1989

Appl. No.:

7/355014

Inventors:

Harold L. Swartz - Phoenix AZ
Warren W. Stansberry - Phoenix AZ
Jeffrey C. Heidel - Glen Dale AZ
Bradley D. Carlson - Glen Dale AZ

Assignee:

Schaevitz Sensing Systems, Inc. - Phoenix AZ

International Classification:

G01C 906

US Classification:

33366

Abstract:

A two axis sensor is provided for detecting angular movement relatice to either of two mutually perpendicular axes. The device includes a two-axis sensor comprising an upwardly directed, spherically shaped common electrode, an upwardly directed spherically shaped insulating member uniformly spaced from the common electrode to form a cavity therebetween, the common electrode and the insulating member being sealed to each other about respective peripheries thereof, with a dielectric fluid contained in the cavity, a plurality of detecting electrodes provided on an underside of the insulating member, the detecting electrodes formed by a selectively applied conductive surface coating on the underside, and a device for detecting variations in capacitance proportional to movement of the sensor relative to each of two mutually perpendicular axes by reason of movement of the dielectric fluid within the cavity.

US Patent:

45676666, Feb 4, 1986

Filed:

Aug 30, 1983

Appl. No.:

6/527908

Inventors:

Thomas W. Neis - Phoenix AZ
Harold L. Swartz - Glendale AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

G01C 906
G01C 928

US Classification:

33180R

Abstract:

A null-adjusting tool for aligning a tilt sensor of the electrolytic liquid type to the vertical is provided. A sensor mounting plate with a tilt-sensing element attached thereto is rotated about a pivot pin by the rotation of a coarse and fine adjustment screw. The coarse adjustment screw acts directly on the sensor mounting plate. The fine adjustment screw provides a high degree of position resolution control through a combination of screw thread and lever type mechanical advantage. A digital readout containing a liquid crystal display and self-contained power source is mounted on the null-adjusting tool to provide a visual indication of the angular deviation of the tilt sensor from the vertical during the alignment process.

US Patent:

42700779, May 26, 1981

Filed:

Mar 10, 1980

Appl. No.:

6/129133

Inventors:

Harold L. Swartz - Glendale AZ
Joseph M. Buemi - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

G05B 106

US Classification:

318661

Abstract:

A synchro resolver angular position sensor provides the sine and cosine of angular position by applying a square wave excitation to the resolver stator winding. The corresponding square wave outputs of the sine and cosine windings of the resolver rotor are sampled in time synchronism with the excitation at a predetermined time phase of the square wave excitation cycle. The sampled sine and cosine amplitudes are converted into digital format via an analog-to-digital converter for application to a digital processor. The upper corners of the positively-going leading edges and the lower corners of the negatively-going leading edges of the square wave excitation waveform are rounded to minimize ringing of the sine and cosine square wave outputs from the resolver.

US Patent:

51809869, Jan 19, 1993

Filed:

Oct 15, 1991

Appl. No.:

7/775593

Inventors:

Harold L. Swartz - Phoenix AZ
Warren W. Stansberry - Phoenix AZ
Jeffrey C. Heidel - Glen Dale AZ
Bradley D. Carlson - Glen Dale AZ

Assignee:

Schaevitz Sensing Systems, Inc. - Phoenix AZ

International Classification:

G01R 2726
G01C 906

US Classification:

324660

Abstract:

A two axis sensor is provided for detecting angular movement relative to either of two mutually perpendicular axes. The device includes a two-axis sensor comprising an upwardly directed, spherically shaped common electrode, an upwardly directed spherically shaped insulating member uniformly spaced from the common electrode to form a cavity therebetween, the common electrode and the insulating member being sealed to each other about respective peripheries thereof, with a dielectric fluid contained in the cavity, a plurality of detecting electrodes provided on an underside of the insulating member, the detecting electrodes formed by a selectively applied conductive surface coating on the underside, and means for detecting variations in capacitance proportional to movement of the sensor relative to each of two mutually perpendicular axes by reason of movement of the dielectric fluid within the cavity.

US Patent:

45313008, Jul 30, 1985

Filed:

May 7, 1984

Appl. No.:

6/607997

Inventors:

Jeffrey C. Heidel - Phoenix AZ
Harold L. Swartz - Glendale AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

G01C 906

US Classification:

33366

Abstract:

An apparatus for providing dynamic measurements of the grade of a road bed provides correction for accelerations of the carrying vehicle. A tilt transducer, responsive to both the angle and sense of inclination and to accelerations of the vehicle is used to measure the angle of displacement. The time rate of change of velocity signal derived from the motion of the vehicle is used to provide a signal corresponding to the vehicular acceleration. The acceleration signal level is adjusted to cancel acceleration sensed by the transducer, thereby providing an output reflecting the true angular grade reading.

US Patent:

44343914, Feb 28, 1984

Filed:

Jan 15, 1982

Appl. No.:

6/339541

Inventors:

Harold L. Swartz - Glendale AZ
Randal A. Atkeisson - Phoenix AZ
Rodney A. Carter - Phoenix AZ
Russell C. Parker - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

G05B 602

US Classification:

318662

Abstract:

A display pointer is driven back and forth along a predetermined path by a geared-down miniature d. c. servomotor in accordance with a command signal. The path is determined by an elongated printed circuit board base having closely adjacent, elongated, coextensive triangularly shaped plates thereon, constituting stationary capacitor plates of a pair of variable capacitors. The printed circuit board includes a dielectric material which also overlays the triangular plates. A relatively narrow, electrically conductive slider member extends laterally across the triangular plates and is supported by and rides on the printed circuit board and constitutes a common movable capacitor plate for the variable capacitors. The display pointer is attached to and positioned by the slider. The slider in turn is displaced along the printed circuit board by means of a cable and pulley mechanism coupled to the servomotor.

US Patent:

45036225, Mar 12, 1985

Filed:

Apr 20, 1983

Appl. No.:

6/486631

Inventors:

Harold L. Swartz - Glendale AZ
Thomas R. Hoogervorst - Scottsdale AZ
Lynn R. Lane - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

G01C 906

US Classification:

33366

Abstract:

An inclinometer providing a digital numerical readout includes a level sensor responsive to orientation and means for driving a liquid crystal display to indicate the inclination of a surface with a high degree of precision. Features include high stability with changes in battery voltage and surrounding temperature, a battery condition monitor, freedom from operational adjustments after the initial calibration, and partial blanking of the display to alert a user that the linear inclination limit has been reached. The direct reading digital readout permits ease of operation and a high degree of accuracy and repeatability. Circuitry is especially adapted for low power consumption.

US Patent:

46425551, Feb 10, 1987

Filed:

Jan 31, 1985

Appl. No.:

6/696626

Inventors:

Harold L. Swartz - Glendale AZ
Jeffrey C. Heidel - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

G01R 1152
G01R 2726

US Classification:

324 60C

Abstract:

A differential capacitance detector comprising two pulse generators and a comparator. The width of each pulse generator output is representative of the capacity of each of two capacitors whose differential is to be determined. A comparator provides a third pulse whose width is the difference of the width of the pulses input from the pulse generators and is representative of the capacitance differential between the two capacitors.