Grating Spectrograph Designer

Units and System Parameters

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Unit of Distance Unit of Angle At Object
Unit of Wavelength Central Wavelength [micron]
System Imaging Focal Length [m]

Object Parameters

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Slit Length at Object [rad] Diffraction Limit at Object [rad]

Telescope Parameters

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Telescope Pupil Diameter [m] Telescope Focal Length [m]
Telescope Focal Ratio Telescope Plate Scale [rad/m]
Slit Length at Telescope Focus [m] Diffraction Limit at Telescope [m]

Slit Parameters

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Slit Width at Object [rad] Slit Width at Telescope Focus [m]
Projected Slit Width [pixel]

Collimator Parameters

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Collimator Focal Length [m] Collimator Beam Size [m]

Grating Parameters

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Grating Groove Pitch [line/mm] Grating Order
Grating Input Angle (alpha) [deg] Grating Spectrograph Angle [deg]
Grating Beam Ratio Grating Length [m]
Grating Free Spectral Range [micron] Grating Free Spectral Range [pixel]
Grating Dispersion [micron/pixel] Grating Dispersion [m/s/pixel]
Grating Dispersion [R-pixel] Grating Dispersion [micron/slit]
Grating Dispersion [m/s/slit] Grating Dispersion [R-slit]

Camera Parameters

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Camera Focal Length [m] Camera Imaging Focal Ratio
Camera Half-Width [deg]

Detector Parameters

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Detector Pixel Size [micron] System Imaging Plate Scale [pixel/rad]
Detector Width [pixel]

Diffraction parameters

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Diffraction Limit (cross-disp) [pixel] Diffraction Limit (disp-dir) [pixel]

Secondary Wavelengths

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Lo Wavelength [micron] Hi Wavelength [micron]



	    
	    
	    
	

This web page is a multi-directional spreadsheet. All the cells are interlinked, so setting one cell might change any other cell. The "enter" key or the button will fill in the derivable values. Checking the "Hide" boxes will make the variable not show. will show all variables, even internal variables of no interest. will set the variables back to the values since the last . For earlier values, use the browser's button. The spreadsheet silently ignores non-numeric or invalid input.

If the values come up in red, then there is some problem, which is usually the fault of the user. The most likely causes are:

Also, some capabilities of the underlying program are not implemented by the web interface. Mainly, this is when "LOOP" appears, which means that a ring of variables exist which could in theory be solved, but the program needs to be given a starting value.

To-do list:


Last change 2007-02-17 • Return to Homepage