The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.
Derivative Scanning for Wavelength Identification
Volume 20, Number 3 (June 1966) Page 193-194
Walters, J.P.; Malmstadt, H.V.
With spectrographs of low dispersion, wavelength identification can become difficult even under high magnification. With prism instruments, such as the Bausch and Lomb Medium Quartz spectrograph used here, the problem is further compounded by nonlinear display on the photograph. However, if a small region of the spectrum is recorded, it is possible to calculate a dispersion that will be approximately linear. The problem is then reduced to measuring the distance between lines of known wavelengths on the strip chart recording. Such distances can be measured with good accuracy if a first derivative tracing is made from the densitometer output, rather than the conventional transmission recording.