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Updated: Oct 2, 2026

Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector
Published on: July 25, 2014
Use of a PDP-12 computer for an on-line analysis of TC-chromatograms by a scanning system
Abstract:
A software system, Chromscan, has been developed on a PDP-12 computer for quantitative analysis of TC-chromatograms and correlated problems in an on-line scanning system. The program controls a one- or two-dimensional scanning process of either a microscope stage or a modified TC-chromatogram photometer (Zeiss) storing the data on tape. The results can be obtained directly or in an off-line calculation by different Focal-12 programs. For spot evaluations a two-dimensional scan is performed with an aperture. The area of spots is measured and the integrated values of absorbed or remitted light represent the amount of separated substances. For line-scans slits are used. The pherogram is displayed on the scope to keep for baseline corrections peak-integration and some other handling under operators control.
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