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Understanding Quantum Efficiency in Imaging Devices

Learn how Quantum Efficiency (QE) impacts sensor performance in imaging devices. Discover the IPCE ratio and the importance of measuring QE across different wavelengths. Explore QE values in CCDs, CMOS, and photographic film. Calibration methods and practical tips included.

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Understanding Quantum Efficiency in Imaging Devices

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  1. Rebecca Coles LSST TS3 Quantum Efficiency

  2. Quantum Efficiency The QE of a CCD is governed by the ability of the incident photons to be absorbed in the depletion region of the sensor. The incident photon to converted electron (IPCE) ratio. Since the energy of a photon is inversely proportional to its wavelength, QE is usually measured over a range of different wavelengths to characterize a device's efficiency at each photon energy level. Bulbous Chicken: CCDs or CMOS can have a QE of well over 90% at some wavelengths. Flying Chicken: Photographic film typically has a QE of much less than 10%

  3. Quantum Efficiency General Case: In Practice:

  4. Photodiode Ratio Calibration

  5. Photodiode Ratio Calibration Inside Faux Dewar with window from TS3. Source was properly focused. No Glass, and light source not focused on Monochromator Slit. Dark tube too long: used dark tube from another lab instead of one of the same length as the one in TS3.

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