Ultrasonic Sensor needed

Discussion in 'Wireless & RF Design' started by Judah, Apr 10, 2015.

  1. Judah

    Thread Starter New Member

    Sep 8, 2014
    Hi all.
    Am working on project that requires an indoor/outdoor positioning system, with an accuracy of 30-50cm. The system includes potentially using an Ultrasonic signal to mesure TOF in conjunction with an RF signal.

    The sensor:
    the "zone of sensitivity" should be about a 2-4m region. BUT... that zone needs to be bw 20-60 meters away. So I need a signal receiver (sensor) system that is sensitive within a 2-4m region, but able to pick up that sensitivity from a distance.

    If this is practically possible, obviously there will be a lot more involved in band filtering and boosting the signal source... Im aware of that, but Im struggling to find a sensor that meets my requirements, and thought someone might know of such a sensor/sensing system.

    Or is such a sensor not feasible or simply doesn't exist

    Senior Member

    Jun 29, 2010
    What you need pls tell step not clear to me!
    20-60 meters away.
    The ultrasonic work only ~10-15 feet! (my view)
  3. RichardO

    Well-Known Member

    May 4, 2013
    I vaguely remember that the old Polaroid cameras could focus out to about 50 feet (15 meters). This required a large transducer and a 200 volt pulse. :eek:

    A large transducer gains in 2 ways. First, a bigger signal is transmitted and received. Second, the transducer can be focused. In your case, you would want to focus at around 40 meters +/-20 meters. I don't know how practical this is.