Best way to optimize the readout of a photodiode using motorized stepping motors?

Hi, I'm relatively new to LabVIEW but have now got a mirror motorized with two stepping motors. I reflect a LASER beam off the mirror and onto a photodiode, whose value is read into the computer via an oscilloscope. I would like to optimise this signal somehow by moving the motors but can't see how without using brute force (which might be ok with just two degrees of freedom, but ideally I will add some more later).
Is there any function that does this easily using the position of the motors and the signal input?
Thanks for the help!
Kane

I think you are going to have to build a feedback loop to determine if the photodiode signal is getting stronger or weaker. Technically you probably could use a PID control, but this would probably be an overkill.
You could use half stepping once the photodiode signal "peaks".
Generally speaking, measure the diode, step one axis, measure again, analyze signal strength. You would have to decide how to handle the situation where one axis is peaked, but then peaking the other axis allows for the first axis to peak again.
From the LabVIEW POV you could use a state machine to loop through the measurement, analysis, and axis movement. In a simple method you could use a shift register to hold the 'last value' and compare the new value against that.
So generally speaking you could use PID functions to manage your system, or you could use a more simple approach using a state machine in a loop with a few states to measure, analyze, and control motion.
Mark Ramsdale

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Best way to optimize the readout of a photodiode using motorized stepping motors?

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