ex4
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hello,
i got tricky problem here,hope someone can get me some idea. well it goes like this:
i got pmt(photomultiplier tube working at 650Vdc) and i modulate the light using 50Hz signal, so the current output from the pmt will generate 50Hz sine signal which vary in amplitude according how much light it receive. then i place a medium which will alter the amplitude of the output of pmt but still with the same 50Hz frequency. from there i must turn a motor so the light intensity received by pmt is minimum. got any idea how to do it?? just a note : i musn't move the motor for testing, so what i need is a methode to determined automatically where the motor must turn without turn the motor. :|:|:?::?:
i got tricky problem here,hope someone can get me some idea. well it goes like this:
i got pmt(photomultiplier tube working at 650Vdc) and i modulate the light using 50Hz signal, so the current output from the pmt will generate 50Hz sine signal which vary in amplitude according how much light it receive. then i place a medium which will alter the amplitude of the output of pmt but still with the same 50Hz frequency. from there i must turn a motor so the light intensity received by pmt is minimum. got any idea how to do it?? just a note : i musn't move the motor for testing, so what i need is a methode to determined automatically where the motor must turn without turn the motor. :|:|:?::?:
