Dual segment photodiode response simulation

[HassanIqbal]

Hi Everyone, 

I have been tasked to write a LabView code to simulate the response of Bi-cell detector for the following,

1) The effect of laser spot size on the photodiode response.

2) The effect of changing the gap between the two segments of the photodiode. 

I am looking for ideas what should be the steps I need to follow. 

Regards,

Hassan 

[GerdW]

Hi Hassan,

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@HassanIqbal wrote:

I am looking for ideas what should be the steps I need to follow. 

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Read a book which explains the details of photodiodes.

Then you should have learned about the physical behaviour and the math formulas to simulate it…

[HassanIqbal]

Hi GerdW,

Thanks for your response. 

Actually I looked around a bit before posting my question. For example, this website gives the equation "https://www.aptechnologies.co.uk/support/photodiodes/bi-cell-a-quadrant-photodiodes". I also looked the manuals of the photodiodes, all of them actually giving the equation which is in the link and doesn't include effect of laser spot size or the gap between the segments. 

Regards,

Hassan 

[GerdW · Accepted solution]

Hi Hassan,

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@HassanIqbal wrote:

all of them actually giving the equation which is in the link and doesn't include effect of laser spot size or the gap between the segments. 

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The equation should always work as long as the laser spot size and gap fulfill the requirements given on that website.

On the other hand you can apply basic geometry to describe the expected signals from superpositions of laser spot and photodiodes, with spot size and gap as parameters.