The Calculation of Some Parameters in Common Use for the Coudé Spectrograph

In this paper the parameters such as the angular dispersion, spectral range obtained each time, linear dispersion, angular magnification, overlap of spectral lines, loss of the grating geometry energy, relative energy-distribution curve, etc., are calculated.The conditions to use the bigger collimator or smaller one are particularly discussed.These are helpful to the users for understanding the performance of the Coudé spectrograph and practically using it.