Optics: measuring and testing – By dispersed light spectroscopy – For spectrographic investigation
Patent
1981-09-28
1984-04-10
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
For spectrographic investigation
G01J 318
Patent
active
044418140
ABSTRACT:
A slitless spectrograph simultaneously records spectra of transient or moving light sources along with spectral references marks positioned alongside the spectra for calibration of unknown spectral lines. The reference marks are provided by groups of optical components which cause undispersed light from the unknown source to be focused on a film above or below the spectrum. The angles at which the light beams creating the references marks strike the grating of the spectrograph are specifically selected such that the rate of movement of the reference marks caused by a change in the incident angle of light from the light source into the spectrograph is related to the rate of change of the position of dispersed light which falls at the position of the reference mark when the spectrograph is precisely aimed at the light source.
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