How to Convert Response of (Photodetector,OPT301) Output Voltage(V) to Irradiance (W/m2)

Former Member over 12 years ago

Hi,

Need help on this

How to Convert Response of (Photodetector,OPT301) Output Voltage(V) to Irradiance (W/m2) when LED wavelength = 450nm

In the datasheet only has the wavelength = 650nm curve

Thanks

Regards

David

manlong over 12 years ago

Hi,

So what do you want to detect? What is your application?
After this answer you have to choose if you detect with a threshold or if you want to measure the light?

sincerely

Man Long
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Former Member over 12 years ago in reply to manlong

Hi Man Long,
I control the PWM of LED supply Voltage to get different intensity. Thus I need to measure the LED intensity in W/m2
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manlong over 12 years ago in reply to Former Member

Hi
A led have about one color so one wavelenght. If you led is red, you can consider that the wavelength is 650nm so you can use the value given by the datasheet. If not you can take the value is the graph at the first page of datasheet. For 650nm the photodetector output 0.47V/µW and you know the area of the photodetector that is 2.29 x 2.29mm as indicate at the first page.
So with the voltage you have at the output, you obtain the µW. and you know the area in mm². So you can translate to W/m² easily.
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Former Member over 12 years ago in reply to manlong

Hi Man Long,

Got it, Thanks a lot.
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Former Member over 12 years ago in reply to Former Member

What is the maximum irradiance that opt301 can withstand?
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Former Member over 12 years ago in reply to Former Member

What is the maximum irradiance that can apply to SFH2400-Z?
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