Alfred R Koelle

US Patent:

40756327, Feb 21, 1978

Filed:

May 24, 1976

Appl. No.:

5/689708

Inventors:

Howard A. Baldwin - Los Alamos NM
Steven W. Depp - Los Alamos NM
Alfred R. Koelle - Los Alamos NM
Robert W. Freyman - Los Alamos NM

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

G01S 956
H04B 159

US Classification:

343 68R

Abstract:

The specification relates to a telemetering apparatus comprising a generator which generates at least a single frequency rf signal, a transponder for receiving that signal and for amplitude modulating it in accordance with information selected for transmission, an antenna on the transponder for reflecting the amplitude modulated signal, and a receiver which is preferably located at the generator. The receiver processes the signal to determine the information carried thereby.

US Patent:

48885916, Dec 19, 1989

Filed:

Oct 6, 1988

Appl. No.:

7/254254

Inventors:

Jeremy A. Landt - Los Alamos NM
Alfred R. Koelle - Santa Fe NM
David A. Eckhardt - Albuquerque NM

Assignee:

Amtech Technology Corporation - Santa Fe NM

International Classification:

G01S 1380

US Classification:

342 44

Abstract:

The invention provides a system for discriminating between modulated backscattered signals based upon transmission-to-reception time delay. The system employs a carrier, phase-modulated with a modulating signal, having characteristics which provide unity output when correlated with itself with zero time shift and a substantially lower output level when correlated with itself with a significant time shift. The system works with a backscatter-modulator located a finite distance from the transmitter for receiving and modulating the backscatter of the carrier. A receiver/detector receives and detects the modulated backscattered phase-modulated signal, the detector being phase-sensitive and having as a reference signal the transmitted phase-modulating carrier signal, and having as an input signal the phase modulated backscattered carrier. The detector provides an output signal whose averaged amplitude is substantially dependent upon the degree of phase correlation between the phase of the modulation returned input signal and the reference signal. Finally, the output signal from the detector is selectively processed only when its averaged amplitude is above a threshold level.

US Patent:

47869070, Nov 22, 1988

Filed:

Jul 14, 1986

Appl. No.:

6/885250

Inventors:

Alfred R. Koelle - Los Alamos NM

Assignee:

Amtech Corporation - Santa Fe NM

International Classification:

G01S 956

US Classification:

342 51

Abstract:

A reader transmits interrogating rf signals to a transponder including an antenna having a particular impedance. The signals received by the antenna are converted to a direct voltage which is introduced to a first terminal of a switch such as an emitter of a semi-conductor device having conductive and non-conductive states of operation. A second terminal of the switch, such as the base of the semi-conductor device, receives a voltage variable between first and second magnitudes in accordance with a pattern of binary 1's and 0's in a data source such as a read-only memory (ROM). This pattern of binary 1's and 0's is individual to an object identified by the transponder. The variable voltage on the base of the semi-conductor device causes the emitter-collector current of the semi-conductor device to vary between first and second amplitudes. When this current has the first amplitude, the impedance of the semi-conductor device and the ROM substantially matches the antenna impedance. When this current has the second amplitude, the impedance of the semi-conductor device and the ROM is substantially greater than the antenna impedance.

US Patent:

49996363, Mar 12, 1991

Filed:

Feb 17, 1989

Appl. No.:

7/312617

Inventors:

Jeremy A. Landt - Los Alamos NM
Alfred R. Koelle - Santa Fe NM
David A. Eckhardt - Albuquerque NM

Assignee:

Amtech Technology Corporation - Santa Fe NM

International Classification:

G01S 1332

US Classification:

342 90

Abstract:

Briefly, the range limiting system of the invention is capable of differentiating desired received signals having an amplitude above a predetermined threshold level and at least one other recognizable predetermined characteristic, from other received signals below that predetermined threshold amplitude. The system has a means for combining the received signal, which is of unknown amplitude which may be above or below the predetermined threshold amplitude, with a known signal of the predetermined threshold amplitude having at least one other predetermined characteristic which is distinguishable from the other recognizable characteristic of the received signal. The output of the combining means passes to a signal processing means which produces an output signal whose other recognizable characteristic is determined by the received signal only when the received signal is above the predetermined threshold amplitude, and by the known signal when the received signal is below the predetermined threshold amplitude. The presence or absence of the desired signal is determined on the basis of analysis of the other predetermined characteristic of the output signal of the signal processing means.

US Patent:

50308076, Jul 9, 1991

Filed:

Jan 16, 1990

Appl. No.:

7/465428

Inventors:

Jeremy A. Landt - Los Alamos NM
Alfred R. Koelle - Santa Fe NM

Assignee:

Amtech Corporation - Santa Fe NM

International Classification:

G06R 1520

US Classification:

235375

Abstract:

The subject invention relates to a system for identifying, for writing data into and reading data out of electronic tags which may be attached to moving and moveable objects. An interrogator sends an RF signal to a remote tag, the signal including data intended to be received and stored in the tag. The tag backscatter-modulates the received signal with data temporarily and permanently stored in the tag, including data indicating the identity of the object to which the tag is attached. The interrogator has the capability of (1) recognizing the identity of the tagged object from the returned backscatter-modulated signal and (2) transmitting data to the tag only if it has data to be transmitted to that particular tagged object. This permits data to be selectively transmitted to a tag and received and stored by that tag only after the tag has been identified as a correct one to receive that data. The tag, in addition, may have the capability of increasing its sensitivity to the receipt of transmitted data after receiving a signal from the interrogator of sufficient strength to be capable of transmitting data to that tag.

US Patent:

55107958, Apr 23, 1996

Filed:

Nov 10, 1994

Appl. No.:

8/338008

Inventors:

Alfred R. Koelle - Santa Fe NM

Assignee:

Amtech Corporation - Albuquerque NM

International Classification:

G01S 1358

US Classification:

342114

Abstract:

The invention provides a circuit for analyzing backscatter-modulated RF signals received from a remote transponder to determine whether the transponder is stationary or moving toward the reader or away from it and, if moving, the rate at which the transponder is coming or going. The circuit of the invention can be integrated with existing readers of the type described in U. S. Pat. No. 4,739,328 and requires only a single antenna. In response to the signal received from a transponder, the invention circuit generates three signals, each having a different phase. By analyzing the pattern and frequency of signal state changes in the three signals, the invention can determine the transponder's speed and direction of movement.

US Patent:

42648629, Apr 28, 1981

Filed:

Aug 20, 1979

Appl. No.:

6/067856

Inventors:

Alfred R. Koelle - Los Alamos NM
Jeremy A. Landt - Los Alamos NM

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

G01V 328

US Classification:

324339

Abstract:

An instrument is disclosed for mapping vertical conductive fractures in a resistive bedrock, magnetically inducing eddy currents by a pair of vertically oriented, mutually perpendicular, coplanar coils. The eddy currents drive magnetic fields which are picked up by a second, similar pair of coils.

US Patent:

55044859, Apr 2, 1996

Filed:

Jul 21, 1994

Appl. No.:

8/278276

Inventors:

Jeremy A. Landt - Santa Fe NM
Alfred R. Koelle - Santa Fe NM
Donald F. Speirs - Fairview NM

Assignee:

Amtech Corporation - Santa Fe NM

International Classification:

G01S 1376

US Classification:

342 42

Abstract:

The invention provides a reader-transponder system that prevents reading of undesired transponder signals. The reader generates a low-frequency signal that is used to supply power to the transponder. The same low-frequency signal also is used to generate a clock signal for the transponder. The reader varies the frequency of the low-frequency power signal according to a code that is unique to the reader. Because the transponder clock signal is derived from the encoded low-frequency power signal, it also varies in accordance with the reader's code. The coded transponder clock signal is contained in the modulation of the RF signal produced by the transponder. When the reader receives and decodes the RF signal, it also extracts the transponder clock signal from the received RF signal and compares variations in the extracted transponder clock signal to the code that was applied to the low-frequency power signal transmitted by the reader. If the pattern of variations in the transponder clock signal matches the reader's code, then the reader senses that the RF signal it has received is from a transponder being powered by that reader and no other.