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Bat Detector

Discussion in 'Project Log Discussion' started by Raven Luni, Oct 4, 2012.

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  1. Raven Luni

    Raven Luni

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    Oct 15, 2011
    The floor is yours :)
     
  2. ICGengineerTech

    ICGengineerTech

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    1
    Aug 15, 2012
    Are you asking how we would make on?
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
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    Jan 21, 2010
    No. He has started a project log thread and has also started a discussion thread for anyone who wishes to comment or ask questions.

    That's what this section is for :)
     
  4. ICGengineerTech

    ICGengineerTech

    58
    1
    Aug 15, 2012
    How does it detect bats? Does it pick up the sound they make? We have bats here in Virginia flying around sometimes at night. This would be cool to have to verify that what I'm pointing out to my kids is actually a bat.
     
    Last edited: Oct 4, 2012
  5. Raven Luni

    Raven Luni

    798
    8
    Oct 15, 2011
    It picks up the ultrasound they emit while hunting (they home in on insects very quickly using echolocation) and converts it to audible sound. There are 2 main methods used for this: hetrodyining and frequency division. My detector uses the latter. Essentially you amplify the sound and count the zero crossings then output a wave which changes polarity at every nth crossing (where n is your chosen divisor).

    It is also possible to identify the species from the frequency (hetrodyne detectors are better for this since they have an analogue range). Common and Soprano Pipstrels are the 2 most common species where I am and there is about 10kHz difference between them
     
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