CCD Quantum Efficiency Rechner — Formel
## CCD Quantum Efficiency and Electron Count
Quantum efficiency (QE) is the fraction of incoming photons that produce a detectable photoelectron in the sensor.
### Formula
**N_e = F * A * QE * t**
- *F* = photon flux (photons per m2 per second)
- *A* = pixel area
- *QE* = quantum efficiency (0 to 1)
- *t* = exposure time
Shot noise follows a Poisson distribution: sigma = sqrt(N_e).
Quantum efficiency (QE) is the fraction of incoming photons that produce a detectable photoelectron in the sensor.
### Formula
**N_e = F * A * QE * t**
- *F* = photon flux (photons per m2 per second)
- *A* = pixel area
- *QE* = quantum efficiency (0 to 1)
- *t* = exposure time
Shot noise follows a Poisson distribution: sigma = sqrt(N_e).
Lösungsbeispiel
3.75 um pixels (A = 1.406e-11 m2), QE = 0.80, flux = 1e10 ph/m2/s, 60 s exposure.
- N_e = F * A * QE * t
- N_e = 1e10 * 1.406e-11 * 0.8 * 60
- N_e = 0.1406 * 0.8 * 60
- N_e = 6.749 electrons
- Shot noise = sqrt(6.749) = 2.60 e-