Palo Alto Research Center Inc.

Xerox Corporation

Inguran, LLC

Consolidated Edison Company of New York, Inc.

General Electric Company

Cytonome/st, LLC

Palo Alto Research Corporation Incorporated

Palo Alto Research Company Incorporated

Peter Kiesel

Noble Marshall Johnson

Oliver Schmidt

Joerg Martini

Michael Bassler

Ajay Raghavan

Michael I Recht

Qiushu Chen

Alex N Hegyi

Todd Karin

Markus Beck

Bhaskar Saha

Michael A Kneissl

Marshall Bern

Kyle Arakaki

Lars Wilko Sommer

Richard H Bruce

Kenneth Michael Evans

Jacob N Chamoun

Meng H Lean

Saroj Kumar Sahu

Christian G Van De Walle

Tobias Staudt

Alexander Lochbaum

Christopher L Chua

Doron Kletter

Anurag Ganguli

Bowen Cheng

Jeffrey N Roe

H Ben Hsieh

Jin Yan

Oliver Wolst

Patrick Yasuo Maeda

William S Wong

Francisco Eduardo Torres

Thomas Hantschel

Armin Rainer Völkel

Mark Teepe

Uma Srinivasan

Chang-Jun Bae

Hong Yu

Saman Mostafavi

Bradley Kittrell

Jane Shin

Serena Lee

Julian Schwartz

Malte Huck

Eugene Michael Chow

David Mathew Johnson

Hong Heather Yu

Scott Albert Uhland

Alan G Bell

Huangpin Ben Hsieh

Martin Sheridan

Hoe Jin Hah

Geun-Chang Chung

Andre Strittmatter

Malcolm Graham Smith, Jr

Mohamed Alamgir

Tim Curley

Dogan Timucin

Robert T Stinson, Iv

Norman Nan Shi

Tobias Buergel

Bokkyu Choi

Gyu-Ok Hwang

David Kalman Biegelsen

Armin R Volkel

Eric J Shrader

Steven E Ready

Johnathan Charles Sharpe

Philipp Helmut Schmaelzle

Donald Francis Perrault, Jr

John Christopher Knights

Andreas Schuh

Colin Campbell

Turki Haj Mohamad

Ozan Celik

Tu Hoang

Jingxiao Liu

Sanggeon Lee

Spenser Anderson

Tobias Burgel

Setu Mohta

Konrad Bellmann

Arnd Willy Walter Geis

Oliver H Wolst

Francisco E Torres Torres

Kyle Arkaki

Robert T Stinson Iv

Malcolm G Smith Jr

Marshall W Bern

Techniques for determining characteristics of a stream of jetted material in a three-dimensional (3D) printer are disclosed. An example system includes an ejector configured to release molten droplets along a jetting path from the ejector to a build platform. The system also includes a sensor positioned adjacent to the jetting path and configured to generate an electrical signal in response to light emanating from the molten droplets. The system also includes an optical mask positioned adjacent to the jetting path, the optical mask comprising a plurality of regions configured to modulate the electrical signal generated by the sensor as the molten droplets travel along the jetting path. The system also includes one or more processing devices to receive the electrical signal, analyze the electrical signal to identify one or more characteristics of the molten droplets, and control the 3D printer based on the one or more characteristics.

Real-time molten droplet analyzer with spatial modulation in additive manufacturing

A method comprises receiving streaming data in the form of peak readings developed from spectrum data produced by multiplexed optical sensors of one or more optical fibers. The streaming data comprises wavelength and intensity data associated with the sensors. The method comprises determining, for a particular fiber, whether a number of the peak readings is the same as, or differs from, an expected number, N, where N corresponds to a total number of sensors of the particular fiber. The method also comprises correcting anomalous streaming data in response to determining that the number of the peak readings differs from the expected number, N. The method further comprises storing nominal wavelength and intensity streaming data and the corrected wavelength and intensity streaming data in a structured data table indexed by fiber ID and sensor ID.

System and method for processing signals acquired from multiplexed optical sensors

A sensor network comprises at least one lateral optical fiber and at least one longitudinal optical fiber. The lateral fiber comprises optical sensors coupled to a pavement in a transverse orientation relative to a direction of vehicle travel along the pavement. The longitudinal fiber comprises optical sensors coupled to the pavement in a longitudinal orientation relative to the direction of vehicle travel. The optical sensors are configured to produce wavelength shift signals comprising one or more lateral strain signals associated with the lateral fiber and one or more tangential strain signals associated with the longitudinal fiber. A processor is operatively coupled to the sensor network and configured to determine a weight of vehicles moving along the pavement based on the lateral and tangential strain signals. A transmitter is operatively coupled to the processor and configured to transmit the weight of vehicles to a predetermined location.

Traffic monitoring using optical sensors

An optical fiber mold device has a first portion that includes a base layer having a longitudinal feature configured to receive an optical fiber. At least one second portion is disposed over the base layer. The second portion has a center wall and front and back end walls. The center wall, the front end wall, and the back end wall form a mold cavity. At least one first hole is disposed in the mold cavity and is configured to allow mold material to enter the mold cavity. At least one second hole in the mold cavity is configured to allow air displaced by the mold material to exit the mold cavity.

Optical fiber attachment device

An optical arrangement receives output light emanating from an object disposed within a fluid column that crosses an optical refraction boundary of the fluid column between the object and the optical arrangement. The optical arrangement modifies the output light such that the modified output light has an intensity that is more uniform than the output light.

Light collection from objects within a fluid column

A discrimination system that forms a fluid column and interrogates objects within the fluid column with an excitation source. An optical arrangement collects output electromagnetic radiation emanating from the excited objects disposed within the fluid column and directs the output electromagnetic radiation to a detector. An analyzer reduces the positional dependency of the detected intensity by normalizing the value based on the position of each object.

Systems and method for correction of positionally dependent electromagnetic radiation detected from objects within a fluid column

Techniques for determining characteristics of a stream of jetted material in a three-dimensional (3D) printer are disclosed. An example system includes an ejector configured to release molten droplets along a jetting path from the ejector to a build platform. The system also includes an optical sensor positioned adjacent to the jetting path and configured to generate an electrical signal in response to light emanating from the molten droplets. The system also includes an optical mask positioned adjacent to the jetting path. The optical mask includes light-blocking regions and light-passing regions to modulate the electrical signal generated by the optical sensor. The system also includes one or more processing devices to receive the electrical signal from the optical sensor, process the electrical signal to identify characteristics of the molten droplets, and control the 3D printer based on the characteristics. The characteristics include an estimated temperature of the molten droplets.

Systems and methods taught herein advantageously provide extended dynamic range capabilities to detect low intensity and high intensity emitted or scattered light from particles at high speeds with high sensitivity. Independently controlled first and second optical detector elements that handle light intensities in different dynamic ranges, large overall dynamic range is created. Signals from the detector elements can be combined to create a single combined signal that has excellent sensitivity over a large dynamic range. The detector systems and methods taught herein are particularly advantageous in particle processing where the population of particles can emit or scatter light over a large range of intensity values. Systems and methods taught herein enable a wide dynamic range, optical signals of related to particles of interest within a single detector's dynamic range can be acquired while other optical signals at light intensities outside the single detector's dynamic range can also be accurately captured.

Systems and methods for extended dynamic range detection of light

A monitoring system for a power grid includes one or more power transformer monitors. Each power transformer monitor includes a plurality of optical sensors disposed on one or more optical fibers that sense parameters of the power transformer. Each optical sensor is configured to sense a power transformer parameter that is different from a power transformer parameter sensed by at least one other sensor of the plurality of optical sensors. An optical coupler spatially disperses optical signals from the optical sensors according to wavelength. A detector unit converts optical signals of the optical sensors to electrical signals representative of the sensed power transformer parameters.

Optical monitoring for power grid systems

A system includes a sensor network comprising at least two optical fibers coupled to a pavement. Each optical fiber includes one or more optical sensors installed a predetermined distance from one or more adjacent optical fibers. The one or more optical sensors are configured to produce a wavelength shift signal. A processor is configured to determine one or both of one or more attributes of one or more objects travelling on the pavement and a traffic condition of the pavement based on the wavelength shift signal. A transmitter is configured to transmit the one or more attributes to a predetermined location.

A partial discharge (PD) transducer that includes a PD sensor configured to sense a PD event of an electrical system. At least one light emitting device (LED) is arranged in series with the PD sensor. The LED is configured to receive the electrical sensor signal from the PD sensor and to generate a light signal in response to the electrical sensor signal.

Partial discharge transducer

A system for evaluating a high voltage asset (HV asset) comprises a PD detector disposed in the HV asset. The PD detector comprises an electrical coupler configured to couple electrical disturbances indicative of a partial discharge from a high voltage conductor of the HV asset to an electrical-to-optical converter. The electrical-to-optical converter comprises a light emitter, and is configured to convert the electrical disturbances to a light signal. An optical power receiver is disposed in the high voltage asset and coupled to the PD detector. The optical power receiver is configured to receive optical power from an external optical power source via a non-conducting optical fiber arrangement. The electrical-to-optical converter is configured to communicate the light signal indicative of the partial discharge to an electronic device external of high voltage asset via the non-conducting optical fiber arrangement.

Partial discharge detection system and method

One or more spacers for installing an optical cable are disposed in a trench that extends along an axis. The optical cable includes one or more optical sensors. Each spacer includes a base configured to rest in a bottom of the trench. A first arm extends from the base. The first arm is adjacent to a first wall of the trench. An opposing second arm extends from the base. The second arm is adjacent to an opposing second wall of the trench. The optical cable is configured to extend along the axis.

Installation of optical sensors for use in traffic monitoring

Growing community of inventors

Palo Alto, CA, United States of America

Peter Kiesel