The LightEmitting Diode as a Light Detector

• Autores: William H. Baird, Nathan W. Hack, Kiet Tran, Zeeshan Vira, Matthew Pickett
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 49, Nº. 3, 2011, págs. 171-174
• Idioma: inglés
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• Resumen

  • Alightemitting 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 highoutput LED.1When 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 Earths magnetic field as small as a few nanotesla nT.