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Image analysers

المؤلف:  Sue Jickells , Adam Negrusz (Editors)

المصدر:  Clarkes Analytical Forensic Toxicology

الجزء والصفحة:  359

2026-11-02

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Image analysers

For image analysers, scanning takes place electronically using a combination of a computer with video digitiser, light source, monochromators and appropriate optics to illuminate the plate and focus the image onto a charged-coupled device (CCD) video camera. The captured images are initialised, stored and transformed by the computer into chromatographic data. Back ground subtraction and thresholding are common data-transformation processes. Image analysers provide fast data acquisition, simple instrument design and convenient software tools that search and compare sample images. Techno logical limitations currently prevent image analysers from competing with mechanical scanners in terms of sensitivity, resolution and available wavelength-measuring range. They have proved popular for less-demanding tasks, for the devel opment of field-portable instruments and as a replacement for photographic documentation of TLC separations.