Recent content by Techni

I ended up with a rough estimate for the surface power density of the optical light of 1.92 mW/cm^2 at a distance of 2.5 cm normal to the torch plane (backside of the phone)

Thank you for the response. I ended up using a Thorlabs photodetector (https://www.thorlabs.com/thorproduct.cfm?partnumber=PDA100A-EC). While I ran into the problem with the responsivity of the photodetector being wavelength dependent, due to the smartphone torch covering a wide spectrum...

In doing a project on phototransistors I am using my smartphone as illumination source. In order to find the responsivity of the induced current from the light, I need to know the surface power density, which I could estimate, if I knew the effective optical power of the light from the...