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Electronics => Repair => Topic started by: daisizhou on March 20, 2023, 12:49:01 pm

Title: What type of photodiode is this type?
Post by: daisizhou on March 20, 2023, 12:49:01 pm
(https://i.postimg.cc/WzZhsJH6/P30320-081650.jpg)

The real object is the same as the picture,The working wavelength is 660nm/890-950nm

If you know the exact model, please let me know. Thank you for your help
Title: Re: What type of photodiode is this type?
Post by: CosteC on March 20, 2023, 08:08:46 pm
Photo is not great, but for me it looks more like photovoltaic cell, single one. Calculators have often 4 in series and you can see sections. Technically this is photodiode too - super large and slow. Filter on top may shift peak response wavelength. I am guessing only.
Title: Re: What type of photodiode is this type?
Post by: abdulbadii on March 21, 2023, 03:33:48 pm
Any device info ?
Title: Re: What type of photodiode is this type?
Post by: Kim Christensen on March 21, 2023, 05:49:33 pm
Can you post a picture of the thing this is supposed to be sensing?
Is it some sort of slotted wheel, and where exactly it is positioned relative to the sensors on the PCB?
Title: Re: What type of photodiode is this type?
Post by: daisizhou on March 22, 2023, 12:27:51 am
It is a sensor inside the SPO2 analyzer
Title: Re: What type of photodiode is this type?
Post by: daisizhou on March 22, 2023, 12:49:13 am
This is its user manual
https://wetransfer.com/downloads/0fc1e683ddd4e9babf465fff50543aa320230322004753/15c2f0356def3403d8e07761ef0cad7220230322004811/16f587
Title: Re: What type of photodiode is this type?
Post by: james_s on March 22, 2023, 01:13:13 am
It looks like a bare die, a silicon solar cell and a photodiode are pretty much the same thing. It's very possible that it's a custom part, is yours defective?
Title: Re: What type of photodiode is this type?
Post by: daisizhou on March 22, 2023, 01:21:05 am
I would like to know the exact model, but the appearance is not marked
Title: Re: What type of photodiode is this type?
Post by: james_s on March 22, 2023, 02:06:38 am
Well if it is a custom part then the exact model will be relevant only to the OEM. If it's not marked it will be extremely difficult to determine that for sure.
Title: Re: What type of photodiode is this type?
Post by: daisizhou on March 22, 2023, 03:30:22 am
I checked my back just now, but unfortunately there was no sign,There is no model mark