The light-emitting diode as a light detector

William H. Baird; W. Nathan Hack; Kiet Tran; Zeeshan Vira; Matthew Pickett

doi:10.1119/1.3555506

The light-emitting diode as a light detector

William H. Baird, W. Nathan Hack, Kiet Tran, Zeeshan Vira, Matthew Pickett

Biochemistry, Chemistry, & Physics

Armstrong Atlantic State University

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Alight-emitting diode (LED) and operational amplifier can be used as an affordable method to provide a digital output indicating detection of an intense light source such as a laser beam or high-output LED.¹ When coupled with a microcontroller, the combination can be used as a multiple photogate and timer for under $50. A similar circuit is used as a data logging system for a mirror galvanometer, providing a record of changes in the Earth's magnetic field as small as a few nanotesla (nT).

Original language	English
Pages (from-to)	171-174
Number of pages	4
Journal	Physics Teacher
Volume	49
Issue number	3
DOIs	https://doi.org/10.1119/1.3555506
State	Published - Mar 2011

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The light-emitting diode as a light detector

Abstract

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