Frank D Bucholtz, 711620 English Pl, Crofton, MD 21114

6471710, Oct 29, 2002

Aug 11, 2000

09/635803

Frank Bucholtz - Crofton MD

Advanced Sensor Technology, LLC - Crofton MD

A61B 1900

606130, 600229, 600230

A probe position sensing system for accurately determining a spatial location in a coordinate system of a distal end of a probe assembly. The probe assembly includes an articulated arm having a pair of sections interconnected by a flexible joint and at least one element. The element extends through the joint and is positioned to be subjected to a degree of flexure due to relative displacement of the sections. A flexure of the element induces a change in a physical property associated with the element. An instrument monitors the physical property and derives an angle between adjacent sections from variations of the physical property.

8385547, Feb 26, 2013

Sep 10, 2007

11/853012

Gustavo K. Rohde - Pittsburgh PA, US
Jonathan M. Nichols - Crofton MD, US
Frank Bucholtz - Crofton MD, US

The United States of America, as represented by the Secretary of the Navy - Washington DC

H04L 9/00

380263, 380252

A system and method for encoding zero and one bits for transmission, including generating a first signal from a non-linear chaotic system to represent the one bit, with the signal's embedded vectors being within the non-linear system's attractor set, and generating a second signal from the non-linear system to represent the zero bit, with the signal's embedded vectors being outside the non-linear system's attractor set. The second signal encoding the zero bit can be generated by adding together two chaotic signals arising from the non-linear system initialized with different initial conditions, and weighting the second signal to have approximately the same energy as the first signal. One suitable chaotic systems is a Lorenz system. Systems and methods for decoding a transmitted stream of signals compare a detection statistic of the received stream of signals to a threshold value that depends on the chaotic system.

2013001, Jan 10, 2013

Jun 4, 2012

13/487416

Ross Schermer - Springfield VA, US
Frank Bucholtz - Crofton MD, US
Carl A. Villarruel - Burke VA, US

G02B 27/44
G01B 9/02
G02F 1/29
G02B 26/08
G02F 1/33

356450, 359569, 359572, 3592261, 359305, 359315

A true time delay system and method for an optical carrier signal modulated with a microwave signal. The system includes a beam deflector, with the optical signal being imaged onto the beam deflector, a stationary reflective diffractive grating arranged in a Littrow configuration, a focusing element arranged between the beam deflector and the stationary reflective diffractive grating. In operation, the beam deflector steers the optical beam across the clear aperture of the focusing element and the focusing element transmits the steered beam to the reflective diffractive grating. A change in optical path length experienced by the optical beam as the beam is scanned across the grating surface results in a relative phase delay in the optical beam. The beam deflector can be a rotating mirror, an acousto-optic beam deflector, or an electro-optic beam deflector. The focusing element can be a lens or a curved mirror.

2013005, Mar 7, 2013

Aug 29, 2012

13/597487

Frank Bucholtz - Crofton MD, US
Jonathan M. Nichols - Crofton MD, US

H04B 10/00

398115

A photonic compressive sampling system includes a photonic link with at least one electro-optic modulator that modulates a continuous wave optical energy with both an electrical analog signal and a pseudorandom bit sequence signal. A photodetector receives the modulated optical energy from the electro-optic modulator, and an electrical digitizer digitizes the output from the photodetector. The system enables signal recovery beyond the Nyquist limit of the digitizer. The signal being recovered has a sparse (low-dimensional) representation and the digitized samples are incoherent with this representation. An all-photonic system can faithfully recover a 1 GHz harmonic signal even when digitizing at 500 MS/s, well below the Nyquist rate.

H19259, Dec 5, 2000

Aug 18, 1998

9/135053

Christopher M. Stellman - Waldorf MD
Frank Bucholtz - Crofton MD

The United States of America as represented by the Secretary of the Navy - Washington DC

G01J 328

356326

An apparatus and method for monitoring a stainless steel decarburization cess includes a flame emission spatial imaging spectrometer and a telescopic lens system coupled to the spectrometer. The telescopic lens system is positioned to direct light from the furnace flame into the spectrometer. The flame emission imaging spectrometer and the telescopic lens system are located at a remote distance away from the harsh environment of the furnace flame.

5305075, Apr 19, 1994

Jan 29, 1993

8/012140

Frank Bucholtz - Crofton MD
Kee P. Koo - Alexandria VA
Dominique M. Dagenais - Chevy Chase MD

The United States of America as represented by the Secretary of the Navy - Washington DC

G01B 902

356345

The fiber-optic magnetostrictive transducer system consists of a sensing element having three dual-strip fiber optic magnetostrictive transducers bonded into a single fiber Mach-Zehnder interferometer operating single mode mounted in a symmetrical orthogonal geometry. The dual-strip fiber optic magnetostrictive transducers have predictable and consistent reproducibility and are comprised of a pair of field annealed metallic glass strips bonded to a coil of optical fiber. This structure is in turn mounted on a bobbin structure where the fiber ribbon is attached to the bobbin only at the two ends of the bobbin. This reduces the possible loading of the transducer due to friction between the optical fiber and the surface of the mounting structure and at the same time provide a long sensing fiber in contact with the magnetostrictive element for high sensitivity. The symmetrical orthogonal arrangement of the transducers minimizes magnetic crosstalk and the strip form of the transducer elements maintain high directional sensitivity.

6091490, Jul 18, 2000

Jul 30, 1998

9/126221

Christopher M. Stellman - Waldorf MD
Frank Bucholtz - Crofton MD
Kenneth J. Ewing - Crofton MD

The United States of America as represented by the Secretary of the Navy - Washington DC

G01N 2101
G01J 300

356300

The fiber-optic pipette (FOP) couples a glass capillary, common syringe and a single optical fiber together to provide for a facile means of achieving long-pathlength capillary spectroscopy. The FOP acquires rapid spectroscopic measurements of small-volume liquid samples, while simultaneously achieving signal enhancements of the collected spectroscopic signal.

H8648, Jan 1, 1991

Jan 12, 1990

7/464497

Frank Bucholtz - Crofton MD
Kee P. Koo - Alexandria VA
Anthony Dandridge - Alexandria VA
Alan B. Tveten - Fort Washington MD

United States of America - Washington DC

G01L 124

73800

Improved passive and laser-conditioned magnetic field sensor of compact and integrated construction for enabling the detection of a magnetic field as well as an improved method of manufacture for assembling and selectively pretensioning a subassembly in order to provide an enhanced formation of the subassembly prior to use. The sensor is generally made up of a magnetic field sensing device, first and second fiber-optic elements, first and second couplers, a laser source and a combined detector and analysis means. The first and second couplers interconnect the first and second fiber-optic elements. The magnetic field sensing device is advantageously connected to one of the fiber-optic elements and is generally made up of a magneto-strictive material (MSM) of ribbon-like shape, a nonmagnetic substrate and a sensing element of optic fiber construction. This element is of predetermined and selective multistrand design between its ends and of generally serpentine shape. The sensing device is advantageously formed such that the MSM and the sensing element are uniformly and selectively pretensioned.