scippneutron.conversion.tof.time_at_sample_from_tof

scippneutron.conversion.tof.time_at_sample_from_tof(*, pulse_time, tof, L2, wavelength)

Compute the absolute time when the neutron passed through the sample.

The result is

\[t_{sample} = t_{pulse} + t_{of} - L_2 / v\]

where

\[v = \frac{h}{m_n \lambda}\]

where \(v\) is the estimated velocity of the neutron over its path from sample to detector and \(\lambda\) is the wavelength of the neutron.

Parameters:

• pulse_time (Union[Variable, DataArray, Dataset, DataGroup]) – absolute time when time of flight is 0

• tof (Union[Variable, DataArray, Dataset, DataGroup]) – the time of fligth of the neutron

• L2 (Union[Variable, DataArray, Dataset, DataGroup]) – path length from sample to detector

• wavelength (Union[Variable, DataArray, Dataset, DataGroup]) – wavelength of the neutron (at the detector). Assuming this did not change during the neutrons travel from sample to detector this can be used to compute the velocity the neutron had between the sample and the detector.

Returns:

Union[Variable, DataArray, Dataset, DataGroup] – \(t_{sample}\)