psf

Summary:

PSF data.

Naming Convention:

psf-{ARM}.fits, where {ARM} is one of ‘b’, ‘r’, ‘z’.

Regex:

psf-[brz]\.fits

File Type:

FITS, 23 MB

Contents

Number	EXTNAME	Type	Contents
HDU0	XCOEFF	IMAGE	Legendre coeff for CCD x vs. wavelength
HDU1	YCOEFF	IMAGE	Legendre coeff for CCD y vs. wavelength
HDU2	SPOTS	IMAGE	Zemax PSF spots
HDU3	SPOTX	IMAGE	CCD x locations of spots
HDU4	SPOTY	IMAGE	CCD y locations of spots
HDU5	FIBERPOS	IMAGE	Location of each fiber along slit
HDU6	SPOTPOS	IMAGE	Locations along slit where spots were generated
HDU7	SPOTWAVE	IMAGE	Wavelength of generated spots

SPOTS[i,j] is 2D image[y,x] of Zemax spot on the CCD at SPOTX[j], SPOTY[i] and along the slit at SPOTPOS[i] which is wavelength SPOTWAVE[i].

FITS Header Units

HDU0

EXTNAME = XCOEFF

Legendre coeff for CCD x vs. wavelength.

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	8	int	length of data axis 1
NAXIS2	500	int	length of data axis 2
EXTNAME	XCOEFF	str
DATAMIN	1.175494350822e-38	float	minimum allowed data value
DATAMAX	3.402823466385e+38	float	maximum allowed data value
DATATYPE	Normalized Image	str	Type of image
SPECTRO	DESI-0224-v1.ZMX (95% better)	str
ARM	Red	str	Spectrograph Arm
ARMINT	3	int	Spectrograph Arm
WAVECENT	669.0	float	Center Wavelength (nm)
XCENT	6.159039977	float	Detector X Centroid (mm)
YCENT	-29.960402484	float	Detector Y Centroid (mm)
XDIRCOS	0.01699287200071	float	x direction cosine
YDIRCOS	-0.9885050150412	float	y direction cosine
ZDIRCOS	4.774490530784e-312	float	z direction cosine
PIXSIZE	0.001	float	size of pixel (mm)
DIFFRACT	T	bool	diffraction added?
DETEFF	T	bool	detector effects added?
PUPIL	126.5	float	Camera Pupil (mm)
FOCALLEN	215.0	float	Camera focal length (mm)
E2VFLAG	F	bool	e2v detector
TEMP	175.0	float	Detector T (K)
DETSIG	5.0	float	sigma for detector (um)
DETTHICK	250.0	float	thickness of detector (um)
DATE	2013-09-12	str	Date
CTYPE1	X	str	X coordinate (mm)
CTYPE2	Y	str	Y coordinate (mm)
CRPIX1	113.0	float	Reference X pixel
CRPIX2	113.0	float	Reference Y pixel
CRVAL1	6.158579827	float	Reference X value
CRVAL2	-29.961502809	float	Reference Y value
CDELT1	0.001	float	X pixel size (mm)
CDELT2	0.001	float	Y pixel size (mm)
PSFTYPE	SPOTGRID	str	Grid of simulated PSF spots
NPIX_X	4114	int	Number of CCD pixels in X direction
NPIX_Y	4128	int	Number of CCD pixels in Y direction
NSPEC	500	int	Number of spectra
NWAVE	11	int	Number of wavelength samples
CCDPIXSZ	0.015	float	CCD pixel size [mm]
DFIBER	0.23	float	Center-to-center pitch of fibers on slit [mm]
DGROUP	0.556	float	Spacing between fiber groups on slit [mm]
NGROUPS	20	int	Number of fiber groups per slit
NFIBGRP	25	int	Number of fibers per group
WAVEMIN	5564	int	Min wavelength for Legendre domain [-1,1]
WAVEMAX	7805	int	Max wavelength for Legendre domain [-1,1]
WMIN_ALL	5625	int	Min wavelength seen by all spectra [Ang]
WMAX_ALL	7741	int	Max wavelength seen by all spectra [Ang]

Data: FITS image [float64, 8x500]

HDU1

EXTNAME = YCOEFF

Legendre coeff for CCD y vs. wavelength.

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	8	int	length of data axis 1
NAXIS2	500	int	length of data axis 2
EXTNAME	YCOEFF	str
WAVEMIN	5564	int	Min wavelength on the CCD [Ang]
WAVEMAX	7805	int	Max wavelength on the CCD [Ang]
WMIN_ALL	5625	int	Min wavelength seen by all spectra [Ang]
WMAX_ALL	7741	int	Max wavelength seen by all spectra [Ang]

Data: FITS image [float64, 8x500]

HDU2

EXTNAME = SPOTS

Zemax simulated spots.

SPOTS[i,j] is 2D image[y,x] of Zemax spot on the CCD at SPOTX[j], SPOTY[i] and along the slit at SPOTPOS[i] which is wavelength SPOTWAVE[i].

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	225	int	length of data axis 1
NAXIS2	225	int	length of data axis 2
NAXIS3	11	int	length of data axis 3
NAXIS4	11	int	length of data axis 4
EXTNAME	SPOTS	str

Data: FITS image [float32, 225x225x11x11]

HDU3

EXTNAME = SPOTX

X locations of spots.

SPOTS[i,j] is 2D image[y,x] of Zemax spot on the CCD at SPOTX[j], SPOTY[i] and along the slit at SPOTPOS[i] which is wavelength SPOTWAVE[i].

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	11	int	length of data axis 1
NAXIS2	11	int	length of data axis 2
EXTNAME	SPOTX	str

Data: FITS image [float32, 11x11]

HDU4

EXTNAME = SPOTY

Y locations of spots.

SPOTS[i,j] is 2D image[y,x] of Zemax spot on the CCD at SPOTX[j], SPOTY[i] and along the slit at SPOTPOS[i] which is wavelength SPOTWAVE[i].

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	11	int	length of data axis 1
NAXIS2	11	int	length of data axis 2
EXTNAME	SPOTY	str

Data: FITS image [float32, 11x11]

HDU5

EXTNAME = FIBERPOS

Location along the slit of each fiber.

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	500	int	length of data axis 1
EXTNAME	FIBERPOS	str

Data: FITS image [float64, 500]

HDU6

EXTNAME = SPOTPOS

Location along the slit of each spot.

SPOTS[i,j] is 2D image[y,x] of Zemax spot on the CCD at SPOTX[j], SPOTY[i] and along the slit at SPOTPOS[i] which is wavelength SPOTWAVE[i].

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	11	int	length of data axis 1
EXTNAME	SPOTPOS	str

Data: FITS image [float64, 11]

HDU7

EXTNAME = SPOTWAVE

Wavelengths at which each spot was measured.

SPOTS[i,j] is 2D image[y,x] of Zemax spot on the CCD at SPOTX[j], SPOTY[i] and along the slit at SPOTPOS[i] which is wavelength SPOTWAVE[i].

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	11	int	length of data axis 1
EXTNAME	SPOTWAVE	str

Data: FITS image [float64, 11]