Article View: sci.electronics
Article #4782Re: Kludged Laser Power Supply
From: siegman
Date: Tue, 05 Jun 1990 20:26
Date: Tue, 05 Jun 1990 20:26
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1397 bytes
In article <5452@jhunix.HCF.JHU.EDU> ins_atge@jhunix.UUCP (Thomas G Edwards) writes:
>
>I mounted a mirror on a shaft of a DC motor (mirror is perpendicular to
>shaft on the end), and noticed that the reflected laser beam forms
>a circle on the wall (I thought it would form a small line...I forgot
>that the mirror would be off-axis in two different ways).
>I have had fun projecting it onto the wall of a nearby building.
>
1. The mirror should be (MUST be) just slightly OFF perpendicular to
the shaft.
2. Bounce the beam off TWO such mirrors in a zigzag "shallow Z"
configuration. Include variable-speed controls on both motors,
and be sure to include a reversing switch for one of them.
Interesting "circular Lissajou figures" are the result. Also
interesting: the difference in patterns when you reverse one
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!usc!apple!agate!shelby!siegman@sierra From: siegman@sierra.STANFORD.EDU (siegman) Newsgroups: sci.electronics Subject: Re: Kludged Laser Power Supply Message-ID: <54@sierra.STANFORD.EDU> Date: 5 Jun 90 20:26:21 GMT References: <5395@jhunix.HCF.JHU.EDU> <2667547f-214.1sci.electronics-1@vpnet.chi.il.us> <5452@jhunix.HCF.JHU.EDU> Sender: siegman@sierra.Stanford.EDU (Anthony E. Siegman) Organization: Stanford University Lines: 17