1 / 4

Update to Absolute QE – Photon Flux

Update to Absolute QE – Photon Flux. Need to know illumination power at CCD Measure illumination power in integrating sphere during QE measurements Use K (= power at CCD/Power at sphere) to determine light level at CCD What if K is not constant but K( l )?

kaden-craft
Download Presentation

Update to Absolute QE – Photon Flux

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Update to Absolute QE – Photon Flux • Need to know illumination power at CCD • Measure illumination power in integrating sphere during QE measurements • Use K (= power at CCD/Power at sphere) to determine light level at CCD • What if K is not constant but K(l)? • Measure K for newly design integrating sphere • Better uniformity at CCD? • No need to 2-sphere illumination Scarpine, CCD Meeting

  2. K Factor from Monochromator • K appears to depend on l • Is this dependence in illumination system or photodiode calibration? • Could have a ~10% effect on QE measurement in near IR Scarpine, CCD Meeting

  3. K from Monochromator and Filter Wheel Scarpine, CCD Meeting

  4. Conclusion • Is K a function of l or this in the photodiode calibration? • Is there some l dependent absorber in system? • Either way, this will change the shape of the absolute QE curve Scarpine, CCD Meeting

More Related