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[OM] Re: E-1 review

Subject: [OM] Re: E-1 review
From: Mark Marr-Lyon <markml@xxxxxxx>
Date: Tue, 16 Mar 2004 19:40:58 -0700
Yes, but it doesn't move it as a single unit.  Ultrasonic means it's 
moving at more than 20kHz, and probably more like a couple hundred 
kilohertz if not higher.  I would think that several wavelengths would 
have to fit across the sensor/glass in order to be effective at moving 
dust, so some parts of the glass are moving in the opposite direction 
as other parts at any given time.  I would also guess that it chirps 
the driving frequency to avoid standing waves and the dust collecting 
at the velocity nodes on the plate (Chladni patterns).

To do anti-shake by moving the sensor, a much lower frequency and 
larger amplitude motion system is needed.

Mark

On Mar 16, 2004, at 7:13 PM, Chuck Norcutt wrote:

> I'm still hopeful that the ultrasonic cleaner mechanism can be turned
> into an anti-shake system.  It already moves the sensor at high speed,
> all it needs is some control.
>
> Chuck Norcutt


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