J
John - KD5YI
- Jan 1, 1970
- 0
I have data sheets for two PIN photodiodes. I would like to compare their
sensitivities. One of them is specified in mw/cm^2 and the other is in lux.
I have tried to find a way to convert one to another, but it seems that the
mw/cm^2 is radiometry terms and lux is a photometry term involving weighting
due to the response of the human eye. I'm at a loss.
Here are the relevant data points (I think):
Diode 1
Vishay BPV22NF
80 uA at 1 mW/cm^2 at 950 nm
Diode 2
Sharp PD481PI
5 uA at 100 lux at 960 nm
(actually, they say 5 uA at 100 lux using a CIE standard light source
(tungsten lamp) but peak sensitivity is at 960 nm)
Any help comparing the relative sensitivities will be greatly appreciated.
Thanks,
John
sensitivities. One of them is specified in mw/cm^2 and the other is in lux.
I have tried to find a way to convert one to another, but it seems that the
mw/cm^2 is radiometry terms and lux is a photometry term involving weighting
due to the response of the human eye. I'm at a loss.
Here are the relevant data points (I think):
Diode 1
Vishay BPV22NF
80 uA at 1 mW/cm^2 at 950 nm
Diode 2
Sharp PD481PI
5 uA at 100 lux at 960 nm
(actually, they say 5 uA at 100 lux using a CIE standard light source
(tungsten lamp) but peak sensitivity is at 960 nm)
Any help comparing the relative sensitivities will be greatly appreciated.
Thanks,
John