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NNTP-Posting-Date: Thu, 28 Nov 2002 06:59:59 -0600
From: "Arthur Jernberg"
Subject: Re: Homebrew Microwave Interferometer
Date: Thu, 28 Nov 2002 07:59:59 -0500
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Has even been used to 'pick up' audio from glass windows, etc in certian
applications and demands.
"Rene Tschaggelar" wrote in message
> It can be used.
> The surface just has to reflect the microwaves to a sufficient degree.
> A homodyne detection as in the interferometer has the phase as output.
> And since this phase corresponds to the amplitude, you could basically
> connect an amp there.
> Ing.Buero R.Tschaggelar - http://www.ibrtses.com
> & commercial newsgroups - http://www.talkto.net
> markthomas77@Hotmail.com wrote:
> > 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.
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