NDLI: Use of inherent physical properties of LED for their safe monitoring in railway signaling

Content Provider	IEEE Xplore Digital Library
Author	Poucha, J.
Copyright Year	2012
Description	Author affiliation: Applied electronics and telecommunications dept., University of West Bohemia in Pilsen, Czech Republic (Poucha, J.)
Abstract	This paper proposes a method for monitoring proper function of light emitting diodes (LED) in railway optical signals, based on some inherent physical properties of this diodes and also on some physical properties of the optical system of the signal lamp. A partial reflection of light on optical interfaces in front of LED chip is used to evaluate the irradiated power of lighting LED. Switching two or more diodes enables to use their photoelectric properties as a photodetecting element. A simple relaxation oscillator, which uses internal capacity of LED's p-n juction is proposed as a simple analog interface to an MCU, which drives or monitors the lamp and sends the information on its state to the upper level interlocking system.
Starting Page	215
Ending Page	218
File Size	151039
Page Count	4
File Format	PDF
ISBN	9781467319638
ISSN	18037232
e-ISBN	9788026100393
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-09-05
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Univ of West Bohemia
Subject Keyword	LED lamps Lighting Railway safety Color Light emitting diodes Rail transportation Optical coupling Voltage control Monitoring Oscillators
Content Type	Text
Resource Type	Article

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Use of inherent physical properties of LED for their safe monitoring in railway signaling