runcyclexcski
Newly Enlightened
- Joined
- Mar 5, 2008
- Messages
- 7
I have a 300 nm UV LED rated at 30 mW power output. Is there a decent sensor (to within 25% error) that I could use to measure the power of the light I managed to collect, without having to spend thousands on a high-end sensor? Some details are below:
LED: https://shop.boselec.com/products/vpc1a1-300-smd-c
Power output 30 mW
Forward current 500 mA
Forward voltage 6.0 V
Peak wavelength 300 +/- 5 nm
Spectrum FWHM (typ.) 15 nm
Viewing angle (half power) 130 deg.
I drive it at 6V (getting about 0.12A, which is 4x less than the 500 mA rating... does it mean that I should be getting, at best, 30 mW/4 = 7.5 mW???). I collect the light using a 6mm silica lens (>95% transmission in UV), 6 mm focal length, and re-focus into a diffraction spot using another silica lens (10/10). A laser power meter gives readings 10x less than the 30 mW that I expect (?). Of course, this might be due to incomplete collection of light, but I do not think I lose 90% of light. The power meter gives good readings with a 'non-exotic' 532 laser line (within 20% of expeceted value).
LED: https://shop.boselec.com/products/vpc1a1-300-smd-c
Power output 30 mW
Forward current 500 mA
Forward voltage 6.0 V
Peak wavelength 300 +/- 5 nm
Spectrum FWHM (typ.) 15 nm
Viewing angle (half power) 130 deg.
I drive it at 6V (getting about 0.12A, which is 4x less than the 500 mA rating... does it mean that I should be getting, at best, 30 mW/4 = 7.5 mW???). I collect the light using a 6mm silica lens (>95% transmission in UV), 6 mm focal length, and re-focus into a diffraction spot using another silica lens (10/10). A laser power meter gives readings 10x less than the 30 mW that I expect (?). Of course, this might be due to incomplete collection of light, but I do not think I lose 90% of light. The power meter gives good readings with a 'non-exotic' 532 laser line (within 20% of expeceted value).
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