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Which ultrasonic sensor for your face?

  1. Mar 30, 2008 #1
    Ok so say i have an application that measures how close your head is to something.

    I'm currently looking at ultra sonic sensors, I'm not sure which type to get. I am mostly worried about how accurate they will be. Say I'm measuring your head right now how far away it is from your monitor, i need the signal to bounce off your head, not anything in the background, so I'm guessing it has to be a narrow beam width.

    Also, what are typical outputs of these things? I know they operate at frequencies higher than 20KHz, but is there a way they can still give you a headache if one is near your ear for extended periods of time??????

    any input appreciated.
  2. jcsd
  3. Mar 30, 2008 #2
    Ok so i found some on this site:

    which are way to expensive for what i need. Then i found some on www.mouser.com. but one of them is a transmitter/receiver, and in the data sheet it doesn't really say how to hook it up and it appears to only have two wires coming off of it, how could this work??????
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