Comparison of two Si Photodiodes

Thread Starter

pblanos

Joined Jan 23, 2014
8
Hello,

I have two photodiodes which I need to compare (please see attached).

When I connect the two Photodiodes separately to a multimeter:

- the Hamamatsu ones has the following readings:

Uncovered 420 mV - Covered 320 mV

- whereas the other photodiode the following:

Uncovered 90 mV - Covered 10 mV

What does this voltage reading mean to the function of the photodiode, in what sense do the two photodiodes differ?


I would appreciate it if someone could explain me.

Thank you in advance,

Panos
 

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GopherT

Joined Nov 23, 2012
8,009
Hello,

I have two photodiodes which I need to compare (please see attached).

When I connect the two Photodiodes separately to a multimeter:

- the Hamamatsu ones has the following readings:

Uncovered 420 mV - Covered 320 mV

- whereas the other photodiode the following:

Uncovered 90 mV - Covered 10 mV

What does this voltage reading mean to the function of the photodiode, in what sense do the two photodiodes differ?


I would appreciate it if someone could explain me.

Thank you in advance,

Panos

There are many differences in the specification. A room light comparison is not sufficient. The JMS diode must have a cut-off filter to remove sensitivity to high energy (blue and UV) light - it only can sense light down to 530 nm.

The difference in the diodes cannot be determined clearly because the specifications are presented differently on the two datasheet. There is no way to compare the sensitivity vs wavelength and speed of response. One lists relative sensitivity vs wavelength and the other as amps per illumination energy (watts).
 
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