Dark Current

The dark current signal can be added to each sub-exposure using the dark_current keyword

<channel> channel
    <detector>
        <dark_current> True </dark_current>
    <detector>
</channel>

or disabled by setting the dark_current keyword to False.

By default, this Task used to add the dark current is AddConstantDarkCurrent, which, as the name suggests, adds a constant flux to each pixel.

It can be set as

<channel> channel
    <detector>
        <dark_current> True </dark_current>
        <dc_task> AddConstantDarkCurrent </dc_task>
        <dc_mean unit="ct/s"> 5 </dc_mean>
    <detector>
</channel>

Using the configuration reported in the example, the codes adds to each pixel \(5 \, ct/s \times t_{s, \,int}\) where \(t_{s, \,int}\) is the sub-exposure integration time.

It is always possible to replace this function with one using a dark current map, to add a different dark current to each pixel which can also evolve in time. A custom task can be used to replace AddConstantDarkCurrent (see Custom Tasks).

An implementation of dark current map has been prepared assuming numpy array (see numpy documentation)

as input (AddDarkCurrentMapNumpy). It can be used as

<channel> channel
    <detector>
        <dark_current> True </dark_current>
        <dc_task> AddDarkCurrentMapNumpy </dc_task>
        <dc_map_filename> dark_map.npy </dc_map_filename>
    <detector>
</channel>

Note

Other custom realizations of this Task can be developed by the user (see Custom Tasks).