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From: John Larkin
Subject: Re: Homebrew Microwave Interferometer
Date: Thu, 28 Nov 2002 10:34:05 -0800
Organization: Posted via Supernews, http://www.supernews.com
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On 28 Nov 2002 03:27:14 -0800, MarkThomas77@Hotmail.com
>I am curious if a 10 mw cw x-band microwave radar could be used as a
>non contact acoustic vibration sensor? For example: if the transmitted
>beam from such a system were aimed at an acoustic target playing music
>(stereo) a few feet away and the reflected beam is combined with a
>sample of that beam that was sent straight into the mixer, could the
>acoustic micro displacements in the i.f. be phase demodulated so that
>the audio could be heard and understood?
>How could this be done exactly? Could an audio amp be connected
>straight onto the radars mixer pin and reproduce the audio, or would
>it require that the phase information be detected in an audio version
>of a pll and then amplified? What components would be needed exactly
>to connect to the radars microwave mixer pin to acheive this?
>I am curious if microwaves can be utilized like lasers can such as
>used in the laser listener systems that are well known. There is
>unending amounts of information on the laser systems, but none on the
>microwave versions. Tia.
Try a google search for 'gunnplexer'; that is close to what you're
proposing. There are also lots of surplus, very cheap, microwave
doppler security sensors around.
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