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Tiny Lensless Endoscope Captures 3D Images of Objects Smaller Than a Cell

  • Magazine Article
  • TBMG-35476
Published 2019-11-01 by Tech Briefs Media Group in United States

Researchers have developed a new self-calibrating endoscope that produces 3D images of objects smaller than a single cell without a lens or any optical, electrical, or mechanical components. The tip of the endoscope measures just 200 microns across — about the width of a few human hairs twisted together. As a minimally invasive tool for imaging features inside living tissues, the extremely thin endoscope could enable a variety of research and medical applications.

new

Researchers Turn off Backscattering, Aim to Improve Optical Data Transmission

  • Magazine Article
  • TBMG-35472
Published 2019-11-01 by Tech Briefs Media Group in United States

Engineers at the University of Illinois have found a way to redirect misfit light waves to reduce energy loss during optical data transmission. In a study, researchers exploited an interaction between light and sound waves to suppress the scattering of light from material defects — which could lead to improved fiber optic communication.

new

Optical Neural Network Could Lead to Intelligent Cameras

  • Magazine Article
  • TBMG-35479
Published 2019-11-01 by Tech Briefs Media Group in United States

UCLA engineers have made major improvements on their design of an optical neural network — a device inspired by how the human brain works — that can identify objects or process information at the speed of light. The development could lead to intelligent camera systems that figure out what they are seeing simply by the patterns of light that run through a 3D engineered material structure. The new design takes advantage of the parallelization and scalability of optical-based computational systems.

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Inline Optical Power Monitoring, Network End-to-End Data Link Evaluation System

AS-3 Fiber Optics and Applied Photonics Committee
  • Aerospace Standard
  • AIR6552/1
  • Current
Published 2019-10-02 by SAE International in United States
This document establishes methods to obtain, store, and access data about the health of a fiber optic network using commercially available inline optical power monitoring sensors. This document is intended for: Managers Engineers Technicians Contracting officers Third party maintenance agencies Quality assurance
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How to Use Rotary Encoders to Quickly Convert Mechanical Rotation into Digital Signals

  • Magazine Article
  • TBMG-35291
Published 2019-10-01 by Tech Briefs Media Group in United States

In the digital age, the measurement of rotation of a mechanical shaft on a motor or a rotating instrument knob needs to be done quickly and efficiently. Analog methods such as potentiometers and rotating switches are being replaced by rotary encoders that directly digitize rotary movement, but designers need to be able to appreciate the differences among various encoder types and accurately interpret their digital outputs.

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Optical Evaluation of Directly Injected Methane Using a Newly Developed Highly Repetitive Laser Diagnostics System

Bayreuth Engine Research Center-Mirko Geiger, Lukas Schroeder, Christian Zoellner, Dieter Brueggemann
Goldlücke GmbH-Juergen Goldluecke lng
Published 2019-09-09 by SAE International in United States
Gaining detailed knowledge about the injection and mixture formation inside engines and combustion chambers during different operation modes is of major importance for improving conventional systems as well as developing new, innovative concepts. To reduce pollutants while maintaining high performance and efficiency an advanced understanding of these mechanisms is necessary. Additional challenges arise when it comes to analyzing transient engine operation and cyclic fluctuations as well as rating their contribution to the formation of emissions. This study contains the evaluations of the injection and mixture formation inside a rapid compression machine (RCM) with directly injected methane. A newly developed highly repetitive optical measurement system based on laser-induced fluorescence (LIF) is used for the quantitative visualizations of the air-fuel equivalence ratio (λ). Various operation conditions, such as different compression ratios, variations of the start of injection, variations of charge pressure as well as different injection pressures allow to evaluate influences on the mixture formation. Interpretations of the recorded images deliver a better understanding of direct injection and mixture processes under engine-like conditions as charge motion and…
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Optical Investigation of Mixture Formation in a Small Bore DISI Engine by Laser Induced Exciplex Fluorescence (LIEF)

Technische Univ. Braunschweig-Alexander Pauls, Peter Eilts
Published 2019-09-09 by SAE International in United States
Legislative and customer demands in terms of fuel consumption and emissions are an enormous challenge for the development of modern combustion engines. Downsizing in combination with turbocharging and direct injection is one way to increase efficiency and therefore meet the requirements. This results in a reduction of the displacement and thus the bore diameter. The emerging trends towards long-stroke engine design and hybridization make the use of small bore diameters in future gasoline engines a realistic scenario. The application of direct injection with small cylinder dimensions increases the probability of the interaction of liquid fuel with the cylinder walls, which may result in disadvantages concerning especially particulate emissions. This leads to the question which bore diameter is feasible without drawbacks concerning emissions as a result of wall wetting. In the previous project “GDI Boundary Bore” the feasibility of an SI engine with direct injection and small bore diameter (60 mm) was shown by the analysis of two different cylinder head concepts (3V and 4V). For the acquirement of deeper understanding of the mixture formation in…
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Optical Distance Measurement at Record-High Speed

  • Magazine Article
  • TBMG-35162
Published 2019-09-01 by Tech Briefs Media Group in United States

Scientists of Karlsruhe Institute of Technology (KIT) and École Poly-technique Fédérale de Lausanne (EPFL) have reported that they achieved the fastest distance measurement attained so far. The researchers demonstrated on-the-fly sampling of a gun bullet profile with micrometer accuracy. The experiment relied on a soliton frequency comb generated in a chip-based optical microresonator made from silicon nitride. Potential applications include real-time 3D cameras based on highly precise and compact LIDAR systems.

Machine Vision Applications in Laser Measurement Systems

  • Magazine Article
  • TBMG-35167
Published 2019-09-01 by Tech Briefs Media Group in United States

Machine vision is a broad term with many applications and definitions, but at its most basic definition it is using an imager or camera along with software to inspect and analyze a real world object. In addition to the camera and software, machine vision systems usually include lighting, optics, and pass/fail mechanisms.

New Sensor Could Shake Up Earthquake Response Efforts

  • Magazine Article
  • TBMG-35192
Published 2019-09-01 by Tech Briefs Media Group in United States

A new optical sensor developed at Lawrence Berkeley National Laboratory (Berkeley Lab) could speed up the time it takes to evaluate whether critical buildings are safe to occupy shortly after a major earthquake.