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Plasma Temperature of Spark Discharge in a Lean-burn Spark-ignition Engine Using a Time Series of Spectra Measurements

Kyushu University-Yukihide Nagano, Toshiaki Kitagawa
Okayama University-Nobuyuki Kawahara, Masanobu Watanabe, Eiji Tomita
  • Technical Paper
  • 2019-01-2158
Published 2019-12-19 by SAE International in United States
In this research, a spark plug with an optical fiber has been developed to obtain the emission spectra from the spark discharge and flame kernel. This developed spark plug with an optical fiber can obtain the time series of emission spectra from the spark discharge and Initial flame kernel in the real spark-ignition engine using EMCCD spectrometer. The plasma vibrational temperature of the spark discharge can be measured using the emission spectra from the electrically excited CN violet band system. The plasma of the spark discharge and gas rotational temperature of the initial flame kernel can be also measured using emission spectra from OH* radicals (P and R branches). The plasma temperature of the spark discharge was almost 8,000 K and the gas temperature of the Initial flame kernel approached that of the adiabatic flame temperature.
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A study of Measurement for Oil Film at the Bearing of the Small End of Diesel Engine Connecting Rod

Tokyo City University-Shotaro Suzuki, Shota Yamada, Akemi Ito
  • Technical Paper
  • 2019-01-2332
Published 2019-12-19 by SAE International in United States
Downsizing and slowing down of engine speed reduce mechanical losses and improve fuel economy. However, they exacerbate lubrication condition. The oil film thickness of the bearing of the small end of the connecting rod, which was one of the sliding surfaces with the severest lubrication condition in a diesel engine, was measured in this study to clarify the lubrication condition. Optical fibers were embedded in the bearing, and oil film was measured by means of the laser induced fluorescence method. It was found that oil film thickness was affected combustion gas pressure and distortion of the piston pin.
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MMOD Impact Detection and Location

  • Magazine Article
  • TBMG-35686
Published 2019-12-01 by Tech Briefs Media Group in United States

Determination of micrometeoroid/ orbital debris (MMOD) impact on orbiting spacecraft currently requires visual inspection. For human-rated spacecraft such as the International Space Station (ISS) and previously, the Space Shuttle Orbiter, this has required crew time as well as vehicle assets to identify damage due to MMOD strikes. For unmanned spacecraft, there are no human assets present to conduct detailed surveys to ascertain potential damage.

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Interface Standard, Airborne EO/IR Systems, Electrical

AS-1C Avionic Subsystems Committee
  • Aerospace Standard
  • AS6129A
  • Current
Published 2019-11-19 by SAE International in United States
This standard defines a generic set of electrical interfaces between a host aircraft (“platform”) and an electro-optic/infrared (EO/IR) sensor. This includes connectors, cabling, fiber optics, signals, and power.
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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.

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Wire and Cable Marking Process, UV Laser

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • AS5649A
  • Current
Published 2019-10-21 by SAE International in United States
This standard is applicable to the marking of aerospace vehicle electrical wires and cables using ultraviolet (UV) lasers. This standard specifies the process requirements for the implementation of UV laser marking of aerospace electrical wire and cable and fiber optic cable to achieve an acceptable quality mark using equipment designed for UV laser marking of identification codes on aerospace wire and cable. Wiring specified as UV laser markable subject to AS4373 and which has been marked in accordance with this standard will conform to the requirements of AS50881.
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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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Understanding Fiber Optic Transceiver Design and Test Rules

  • Magazine Article
  • TBMG-35119
Published 2019-09-01 by Tech Briefs Media Group in United States

The design of avionics systems must balance several factors. First, engineers want to increase the performance of the systems installed in aircraft or spacecraft. Second, they want to reduce the size and weight of the equipment that must be carried. Third, they want to maximize the safety of the in-flight systems and maintain communication between the aircraft or spacecraft and other flight vessels and the command center, regardless of the circumstances.

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Understanding Fiber Optic Transceiver Design and Test Rules

Aerospace & Defense Technology: September 2019

  • Magazine Article
  • 19AERP09_03
Published 2019-09-01 by SAE International in United States

The design of avionics systems must balance several factors. First, engineers want to increase the performance of the systems installed in aircraft or spacecraft. Second, they want to reduce the size and weight of the equipment that must be carried. Third, they want to maximize the safety of the in-flight systems and maintain communication between the aircraft or spacecraft and other flight vessels and the command center, regardless of the circumstances.

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All-Silicon MEMS Inertial Sensing at Fiber Optic Gyro Performance Levels

  • Magazine Article
  • TBMG-35195
Published 2019-09-01 by Tech Briefs Media Group in United States

There is increasing demand in many high-end commercial and industrial markets for precision motion sensing for a diversity of applications. In particular, demand is growing for effective guidance and stabilization in applications with severe limitations on space and/or weight, or available budget. UK/Japanese joint venture, Silicon Sensing Systems, has developed a high-performance all-silicon micro-electro-mechanical systems (MEMS) gyro in response to this demand.