detector_basis_vectors_lab

anri.geom.detector_basis_vectors_lab(det_trans, beam_cen_shift, x_distance_shift)

Get the detector’s pixel steps and pixel (0, 0) position in the laboratory frame.

Needed for raytrace_to_det(). The steps are computed directly from the detector transform, not as differences of pixel positions: positions are ~distance away from the origin, so subtracting them loses precision in float32 (about 2e-4 relative for a 75 um pixel at 150 mm).

Parameters:

• det_trans (Array) – [3,3] detector transformation matrix from detector_transforms()

• beam_cen_shift (Array) – [3] beam center shift from detector_transforms()

• x_distance_shift (Array) – [3] X distance shift from detector_transforms()

Returns:

• s_step_lab (jax.Array) – [3] Lab-frame step of one pixel along the slow direction.

• f_step_lab (jax.Array) – [3] Lab-frame step of one pixel along the fast direction.

• det_origin_lab (jax.Array) – [3] Lab-frame position of pixel (0, 0).