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Old 05-02-2010, 04:35 PM #17
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Default Re: weird lpm idea.

if you were to calculate the speed which i think is what you do want to calculate and find a relationship with the mW and speed you should look into hall sensors and a tachometer my friend just built one to show the speed of a large dc motor he put a magnet on the fly wheel and it takes the number times it picks up the presence of the magnet per second and calculates the speed.


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Old 05-02-2010, 10:55 PM #18
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Default Re: weird lpm idea.

You would also need to take into account light reflected from the glass envelope. Not such a problem, if it is found to reflect all wavelengths equally, though.
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