• Modulations in the light of the firefly

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      https://www.ias.ac.in/article/fulltext/jbsc/038/01/0009-0012

    • Keywords

       

      Firefly light; pulse amplitude modulation; pulse width modulation

    • Abstract

       

      Continuous light could be produced from the firefly by making it inhale vapours of ethyl acetate. Here we perform such a control experiment on the Indian species of the firefly Luciola praeusta Kiesenwetter 1874 (Coleoptera : Lampyridae : Luciolinae), and analyse the light in the microsecond time scale. The amplitude of the continuous train of triangular pulses is apparently altered in accordance with the instantaneous values of a hypothetical signal, which exhibits pulse amplitude modulation (PAM). In addition to sampling in amplitude, this scheme apparently provides sampling in time, representing pulse width modulation (PWM). A Fourier transform spectrum of this waveform shows the `carrier’ frequency and the accompanying `side bands’.

    • Author Affiliations

       

      Anurup Gohain Barua1

      1. Department of Physics, Gauhati University, Guwahati 781 014, India
    • Dates

       
  • Journal of Biosciences | News

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