lentil.detector.rule07_dark_current

lentil.detector.rule07_dark_current(temperature, cutoff_wavelength, pixelscale, shape=1, fpn_factor=0, seed=None)[source]

Create dark current frame for HgCdTe infrared detectors using Rule 07

If applied, dark current fixed pattern noise (FPN) is modeled by a log-normal distribution with mean = 1.0 and sigma = fpn_factor where rate = rate * FPN.

Parameters
  • temperature (float) – Focal plane temperature in K

  • cutoff_wavelength (float) – Focal plane cutoff wavelength in m

  • pixelscale (float) – Size of one pixel in m

  • shape (array_like or 1) – Output shape. If not specified, a scalar is returned.

  • fpn_factor (float) – Dark current FPN factor. Should be between 0.1 and 0.4 for CCD and CMOS sensors [2]. When fpn_factor is nonzero, seed must be provided. When fpn_factor is 0 (default), dark current FPN is not applied.

  • seed (None, int, or array_like, optional) – Random seed used to initialize numpy.random.RandomState. If None, then RandomState will try to read data from /dev/urandom (or the Windows analogue) if available or seed from the clock otherwise.

Returns

dark_current – Dark current

Return type

ndarray

References

[1] Tennant, W.E. et al. MBE HgCdTe Technology: A Very General Solution to IR Detection, Described by “Rule 07”, a Very Convenient Heuristic. Journal of Electronic Materials (2008).

[2] Log-normal distribution - Wikipedia

[3] Janesick, J. R., Photon Transfer, Vol. PM170, SPIE (2007)