Re: Microwave Optics Experiments

[Roger Haar <haar@soliton.physics.arizona.edu>]

>         20 kHz seems very high, because it creates rather short
> wavelengths and thus
> constructive and destructive interference are quite close.  I thought
> the sound stuff
> worked nicely at 300 Hz which gives 1 meter wavelength.  Even then two
> ears can
> cause some problems.
>
>         With either sound or microwaves,  problems can occur because
> of unwanted and
> usually unexpected reflections and diffractions.  Reflections about
> the room usually destroy the complet destructive interference.
> Outside is better.
>
> Thanks
> Roger Haar
>
> > > I will try the double slit or grating. (However earlier attempts of
> >
> > demonstrating this while I was trying to demonstrate acoustic
> > interference
> > failed miserably. The only good source for producing two-source, low
> >
> > frequency, interference that I found was to run two high impedence
> > piezo-electric speakers at about 20 kHz and use a microphone as a
> > detector.