December 7, 2021

I, Science

The science magazine of Imperial College

Part of the Imperial Festival podcast series: Andrew Ewing explains how chemical images are created from spectra measurements ...




The Imperial Festival ran Friday 3 May to Saturday 4 May and attracted over 10,000 visitors. I, Science went along and talked to some of the scientists demonstrating their work.

In this episode Andrew Ewing, a PhD Student from the Department of Engineering, explains how a new array detector can create chemical photographs.

Spectra are the light signatures of chemicals and, usually, detectors can obtain just one spectra for a sample. But the new array detector can get many different spectra for a sample by targetting small sections on the sample surface. These measurements act as ‘pixels’ and strung together to form a chemical image. Applications for this technology include determining drug efficacy and making chemical fingerprint images.