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'[EE]: Photo Diode question'
2002\03\03@144857 by j

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I need a larger detector area than a single photodiode.  Is there any reason
I shouldn't daisy-chain them together in series?

Jay

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2002\03\03@150338 by Dave Dilatush

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Jay Hanson wrote...

>I need a larger detector area than a single photodiode.  Is there any reason
>I shouldn't daisy-chain them together in series?

Put them in parallel, not series.  Photodiodes deliver current
proportional to the incident radiation; to get the effect of a larger
area, the individual diodes would need to be in parallel so the currents
add.

DD

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2002\03\03@180841 by Olin Lathrop

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> I need a larger detector area than a single photodiode.  Is there any
reason
> I shouldn't daisy-chain them together in series?

If any diode is dark, then it will block current in the whole chain.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, spam_OUTolinTakeThisOuTspamembedinc.com, http://www.embedinc.com

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2002\03\03@193906 by Mark Perri

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You can also either use a lens to focus your light or get a bigger photodiode.

At 03:20 PM 3/3/02 -0500, you wrote:
> > I need a larger detector area than a single photodiode.  Is there any
>reason
> > I shouldn't daisy-chain them together in series?
>
>If any diode is dark, then it will block current in the whole chain.
>
>
>********************************************************************
>Olin Lathrop, embedded systems consultant in Littleton Massachusetts
>(978) 742-9014, .....olinKILLspamspam@spam@embedinc.com, http://www.embedinc.com
>
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2002\03\03@200704 by j
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Tnx for the help guys.

Jay

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[PICLISTspamKILLspamMITVMA.MIT.EDU]On Behalf Of Mark Perri
Sent: Sunday, March 03, 2002 2:30 PM
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Subject: Re: [EE]: Photo Diode question


You can also either use a lens to focus your light or get a bigger
photodiode.

At 03:20 PM 3/3/02 -0500, you wrote:
{Quote hidden}

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2002\03\03@220747 by Robert Rolf

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EG&G  makes (made?) a series of 4 quadrant photo diodes used for position
detection.
They have a large (2cm square) surface area. We have then in a system that
images IR-LEDs for 3-D position sensing. There are a PITA to use because any
spurious reflections in the work space result in a postition shift,
so it is VERY clear that these devices are summing all input over the
entire area.

Mark Perri wrote:
>
> You can also either use a lens to focus your light or get a bigger photodiode.
>
> At 03:20 PM 3/3/02 -0500, you wrote:
> > > I need a larger detector area than a single photodiode.  Is there any
> >reason
> > > I shouldn't daisy-chain them together in series?
> >
> >If any diode is dark, then it will block current in the whole chain.

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2002\03\03@230915 by j

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>EG&G  makes (made?) a series of 4 quadrant photo diodes used for position
>detection.
>They have a large (2cm square) surface area. We have then in a system that
>images IR-LEDs for 3-D position sensing. There are a PITA to use because
any
>spurious reflections in the work space result in a postition shift,
>so it is VERY clear that these devices are summing all input over the
>entire area.

I know what you mean.  I am using them like PV cells (for voltage, not
current).  If I hook eight in series, I get over 3v under fluorescent
lights.  I believe most people use them differently.

Jay

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