John Anthony Hardy

US Patent:

44410190, Apr 3, 1984

Filed:

Jan 28, 1982

Appl. No.:

6/343653

Inventors:

John W. Hardy - Lexington MA

Assignee:

Itek Corporation - Lexington MA

International Classification:

G01J 120

US Classification:

250201

Abstract:

A relatively simple wavefront sensor is constructed with an astigmatic optical system which focuses an indicent wavefront to x and y focal planes, with the x and y focal planes being relatively displaced along the optical axis because of the astigmatic nature of the optical system. An x modulation reticle is positioned at the x focal plane, and an x drive tuning fork drives the x modulation reticle in linear oscillation at a frequency f. sub. x to modulate the wavefront thereat. A y modulation reticle is positioned at the y focal plane, and a y drive tuning fork drives the y modulation reticle in oscillation, substantially perpendicular to the direction of oscillation of the x modulation reticle, at a frequency f. sub. y, different from the frequency f. sub. x, to also modulate the wavefront thereat.

US Patent:

44383304, Mar 20, 1984

Filed:

Mar 1, 1982

Appl. No.:

6/353554

Inventors:

John W. Hardy - Lexington MA

Assignee:

Itek Corporation - Lexington MA

International Classification:

G01U 120

US Classification:

250201

Abstract:

An incremental slope wavefront sensor having an optical system which focuses an incident wavefront to a focal point. A novel modulation reticle is positioned at the focal point, and is driven in linear oscillation along a single axis. The modulation reticle has a modulation pattern formed thereon by alternating triangular light transmissive areas and inverted triangular light reflective areas. A first detector array detects the wavefront which has passed through the transmissive areas and diverged from the focal point in a two dimensional array of zones. A second detector array detects the wavefront which has been reflected by the reflective areas and diverged from the focal point in a two dimensional array of zones. The output signals from the first and second detector arrays for each corresponding zone are differentially combined to form a differential output signal for each zone. The y position of detected radiation in each zone of the wavefront is obtained by multiplying its differential output signal by a weighting function proportional to the instantaneous velocity of the reticle.

US Patent:

44720297, Sep 18, 1984

Filed:

Mar 1, 1982

Appl. No.:

6/353550

Inventors:

John W. Hardy - Lexington MA

Assignee:

Itek Corporation - Lexington MA

International Classification:

G02F 129

US Classification:

350360

Abstract:

An integrated wavefront compensator for an active optics system in which the components for detecting distortions in a wavefront and the components for correcting the detected wavefront distortions are integrated into one unit. The parallel processing channels of the compensator are fabricated simultaneously using simple, solid state components.

US Patent:

49811355, Jan 1, 1991

Filed:

Jun 16, 1989

Appl. No.:

7/367445

Inventors:

John F. Hardy - Andover MA

International Classification:

A61F 710
A61F 708
A61F 703

US Classification:

128402

Abstract:

There is disclosed herein a therapeutic thermal cuff device for therapeutic heating or cooling treatment of the body members of humans or animals. The device comprises an envelope having interior and exterior panels defining one or more pouches adapted to receive therein packets of a heat of fusion composition. The exterior panel of the envelope comprises a thermally insulative polymer foam layer and that portion of the exterior panel overlying the pouches is quilted in a manner designed to improve the flexibility of the envelope in the direction of wrap of the cuff around the body member. The heat of fusion composition is contained in a heat sealed thermoplastic film container which is also quilted in a manner such as to segment the packet into a number of heat of fusion composition-containing chambers which are articulatingly affixed to one another so as to assure flexibility of the packet in the direction of the wrap of the cuff around the affected body member. The cuff and packets are reusable and the therapeutic thermal treatments provided thereby are of relatively long duration without repeated intervention or replacement of materials.

US Patent:

63043254, Oct 16, 2001

Filed:

Jan 12, 1978

Appl. No.:

5/868951

Inventors:

John W. Hardy - Lexington MA
Joseph E. Lefebvre - Burlington MA
Chris L. Koliopoulos - Tuscon AZ

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01B 902
G01N 2141
G02B 2700

US Classification:

356353

Abstract:

Variable shear A. C. interferometer based on a rotating radial grating. Light is passed through the rotating radial grating to produce multiple sidebands diffracted at various angles. These multiple sidebands produce overlapping (sheared) images of the input wavefront at a detector plane causing intensity variations proportional to the phase difference between the sheared wavefronts. An array of detectors is positioned to monitor the images on the detector plane and the outputs of each are processed to obtain the local slope of the wavefront averaged over each detector. From this data, complete wavefront slope information in one direction (X) can be obtained. By providing a second interferometer to make slope measurements in the Y direction, complete information can be obtained from which the entire input wavefront can be reconstructed. The system provided can be used with white light extended sources, has high optical efficiency, requires only a small number of optical components and is relatively insensitive to vibration. The amount of shear can also be easily varied by translating the grating rotation axis relative to the optical.

US Patent:

44744676, Oct 2, 1984

Filed:

Dec 28, 1981

Appl. No.:

6/335118

Inventors:

John W. Hardy - Lexington MA
Jeffrey H. Everson - Reading MA

Assignee:

Itek Corporation - Lexington MA

International Classification:

G01B 902

US Classification:

356353

Abstract:

A wavefront sensor for detecting the slope of an input wavefront. A surface acoustic wave reflective diffraction grating is positioned at a focal point of the wavefront, and generates surface acoustic waves at two primary frequencies f. sub. 1 and f. sub. 2. The reflective diffraction grating produces a first AC shearing interferogram between two like diffraction orders generated by the f. sub. 1 and f. sub. 2 surface acoustic waves. A photodetector array is positioned to detect the shearing interferogram at a two dimensional array of zones, and the phase of the output signal for each zone is representative of the local slope of the wavefront in the direction of shearing, thus producing the slope in one direction. Complete two dimensional wavefront slope information is obtained by shearing the wavefront in a second orthogonal direction in substantially the same manner utilizing a second surface acoustic wave diffraction grating and a second photodetector array.

US Patent:

42858461, Aug 25, 1981

Filed:

Apr 28, 1980

Appl. No.:

6/144345

Inventors:

John F. Hardy - Andover MA
Donald P. Kintz - Westford MA
Vaughn W. Taylor - Lynn MA

Assignee:

Cabot Corporation - Boston MA

International Classification:

C08L 6702
C08L 6300

US Classification:

260 292E

Abstract:

Disclosed herein are flatted water-reducible coating compositions of the varnish, paint or enamel types, which compositions comprise a water-miscible film forming resin, water as the predominant solvent and a particulate finely-divided silica flatting agent. The method of the invention involves the initial production of a mill paste formulation containing the film forming resin followed by a let-down step employing water as the predominant solvent. The silica flatting agent is introduced into the composition as an aqueous dispersion thereof during or after said let-down step.