Nicola_M Posted June 26, 2012 Report Share Posted June 26, 2012 A gas explosion destroys houses in today's news. http://www.bbc.co.uk/news/uk-england-manchester-18594635What is of note are the words:"A fire service helicopter with listening equipment is at the scene trying to detect if people are trapped in the rubble."I can't figure that one out. Place a listening device on the noisiest aircraft known to man. Surely all that's going to pick up is the sound of its own engine and the rotors? Quote Link to comment Share on other sites More sharing options...
Kaphias Posted June 26, 2012 Report Share Posted June 26, 2012 I can only assume that it works in a manner similar to noise canceling headphones: the drone on the helicopter is reasonably constant, so the software takes that noise out and listens for any outlying noises. Quote Link to comment Share on other sites More sharing options...
Kieran Posted June 26, 2012 Report Share Posted June 26, 2012 Or the microphone is directional, like a shotgun.Or a combination of the two. Quote Link to comment Share on other sites More sharing options...
Hampster Posted June 26, 2012 Report Share Posted June 26, 2012 A dome facing away from the helicopter wouldn't capture the sounds, it's only the vibrations that may effect the detection... interesting... Quote Link to comment Share on other sites More sharing options...
larjeet Posted June 27, 2012 Report Share Posted June 27, 2012 I would think that infared cameras would be of more use. But I believe they would be using sonar or ultrasound sensors lowered from the helicopter into places that where unsafe for rescuers to reach Quote Link to comment Share on other sites More sharing options...
Kieran Posted June 28, 2012 Report Share Posted June 28, 2012 The problem with the infrared camera is that the buildings could still be hot from the explosions. Quote Link to comment Share on other sites More sharing options...
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