ess.reduce.unwrap.lut.make_wavelength_lut_from_polygons#

ess.reduce.unwrap.lut.make_wavelength_lut_from_polygons(ltotal_range, distance_resolution, time_resolution, pulse_period, pulse_stride, frames)[source]#

Compute a lookup table for wavelength as a function of distance and time-of-arrival.

Parameters:

ltotal_range (LtotalRange[TypeVar(RunType), TypeVar(Component)]) – Range of total flight path lengths from the source to the detector.
distance_resolution (unwrap.lut.DistanceResolution (scipp.Variable)) – Resolution of the distance axis in the lookup table.
time_resolution (unwrap.lut.TimeResolution (scipp.Variable)) – Resolution of the time-of-arrival axis in the lookup table. Must be an integer.
pulse_period (unwrap.lut.PulsePeriod (scipp.Variable)) – Period of the source pulses, i.e., time between consecutive pulse starts.
pulse_stride (PulseStride[TypeVar(RunType)]) – Stride of used pulses. Usually 1, but may be a small integer when pulse-skipping.
frames (ChopperFrameSequence[TypeVar(RunType)]) – Chopper frame sequence used to compute the wavelength as a function of distance and event_time_offset in the lookup table.

Return type:

LookupTable[TypeVar(RunType), TypeVar(Component)]