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Photodiodes saturating in ambient light

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aussie_laser_dude:

--- Quote ---I realised nobody has posted a link to Phil Hobb's site on this thread. 18 hours ago I posted the info below on another thread on the same topic...
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That's pretty tempting, the contents convinced me to get it, then i saw the price. Still tempted though. I'm sure it's worth it.


--- Quote ---I suspect the OP is well aware, but others may not be, of the fact that a narrow-band dielectric optical filter will only give the desired response for light incident normally on its surface. The sunlight may come from any direction, which may give problems.
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Yeah it's crossed my mind, too many unknowns at this stage to know for sure if it'll work or not (maximum incidence angle, thickness and properties of dielectric layers etc) so might as well just buy it and see if it helps.
[Edit: Might be getting a bit iffy past the 30 deg mark...


--- Quote ---If you want to pass a squarewave, and block DC, you want a highpass filter - with a cutoff below the fundamental of the squarewave. Its all the higher harmonics that make it square and flat across the top.
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I want to keep the squarewave pulses (well kinda squarish shaped pulses) and remove the slow changing ambient background. StillTrying's simulation shows that an inductor / capacitor can be used to make a high pass filter, but it "splits" the pulse into a positive and negative peak which is unwanted.
   I'll need to think about the harmonics twospoons mentioned. My op amps just arrived in the mail a few hours ago so I can start toying with them and try to figure this one out, should be fun.

I really want that book...


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