lsst.cbp

The cbp package provides code for the LSST collimated beam projector (CBP). The primary objects of interest are:

lsst.cbp.CoordinateConverter: compute the telescope and CBP pointing that will give you a desired beam arrangement, such as placing beam b at point p on the pupil and point d on a specified detector.

lsst.cbp.computeHolePositions: compute hole positions for a CBP mask.

To construct an lsst.cbp.CoordinateConverter you will need to learn about configuration:

• How to Configure an lsst.cbp.CoordinateConverter
  • Basic Configuration
  • Mask Information
  • Camera Geometry

In order to configure and use an lsst.cbp.CoordinateConverter it may help to have some understanding of the coordinate systems involved:

• Coordinate Frames and Planes
  • Base Frame
  • Pupil Frame
  • Internal Azimuth, Altitude and Rotator
  • Observed Azimuth, Altitude and Rotator
  • Focal Plane
  • Pupil Plane
  • Pupil Field Angle
  • Focal Plane Field Angle

Python API reference

lsst.cbp Package

Functions

computeHolePositions(detectorNames, …)

Compute hole positions for a CBP mask.

Classes

BeamInfo(cameraGeom, name, holePos, …)	Information about a beam at the telescope.
CoordinateConverter(config, maskInfo, cameraGeom)	Coordinate conversions for the collimated beam projector (CBP).
CoordinateConverterConfig(*, telPupilOffset, …)	Configuration for the CoordinateConverter.
MaskInfo(name, defaultHole, holePositions[, …])	Information about a CBP mask.

lsst.cbp.coordUtils Module

Functions

fieldAngleToVector(xyrad, flipX)	Convert a pupil field angle to a pupil unit vector.
vectorToFieldAngle(vec, flipX)	Convert a vector to a pupil field angle.
pupilPositionToVector(xyPos, flipX)	Convert a pupil plane position to a 3D vector.
computeShiftedPlanePos(planePos, fieldAngle, …)	Compute the plane position of a vector on a plane shifted along the optical axis.
convertVectorFromBaseToPupil(vectorBase, …)	Given a vector in base coordinates and the pupil pointing, compute the vector in pupil coordinates.
convertVectorFromPupilToBase(vectorPupil, …)	Given a vector in pupil coordinates and the pupil pointing, compute the vector in base coords.
computeAzAltFromBasePupil(vectorBase, …)	Compute az/alt from a vector in the base frame and the same vector in the pupil frame.
getFlippedPos(xyPos, flipX)	Get a 2-dimensional position with the x axis properly flipped.
rotate2d(pos, angle)	Rotate a 2-dimensional position by a given angle.

lsst.cbp.testUtils Module

Classes

SampleCoordinateConverter([…])

An object containing a CoordinateConverter and the information used to create it.