AVR-Chat

I guess it would depend on the temp, but maybe powder coating would work.

Bruce


fnatmed wrote:

> --- In AVR-Chat@yahoogroups.com, "William Nachefski" 
> <slaphappysamy@y...> wrote:
> 
>>I Need a pretty broad range, from say 15,000 rpm to 200,000.  
>>Accuracy doesn't have to be that percise as long as its within a 
>>couple of thousand actuall rpms.  What I meant was With each 
> 
> complete 
> 
>>rotation of the turbine rotar shaft I get one pulse from the 
>>Phototransistor.  So that equates to one pulse to the M.C. per 
>>revolution.  Thanks for the help guys keep the suggestions comming!
> 
> 
> How is the turbine blade assembly attached to the shaft, and what 
> are you using to actually trigger the phototransistor ?
> 
> In my case, the compressor wheel is topped with a regular nut.  I've 
> painted the flats of the nut in alternating white and black, so 
> there are 3 pulses per rev.  I originally tried pointing directly at 
> the blades themselves, but that wasn't consistent enough.
> 
> I'm using plastic light pipes to send a white LED light to the nut, 
> and to read the reflection back.  Problems though ...
> 
> The paint doesn't last.  Need a good way to color the nut flats that 
> will withstand turbo temps.  The light pipes melt.  Need a source 
> for high-temp lexan or something.
> 
> Dean.
> 
> 
>  
> 
> 
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