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Date: Thu, 28 Nov 2002 12:57:52 +0100
From: Rene Tschaggelar
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0
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Subject: Re: Homebrew Microwave Interferometer
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
> 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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