MIRRORS: A MATLAB® GUI for temperature measurement by multispectral imaging radiometry

Abstract

MultIspectRal imaging RadiOmetRy Software (MIRRORS) is an open source MATLAB based Graphical User Interface (GUI) designed to automatically process images generated from a four colour multispectral imaging radiometry system for the temperature measurement of samples heated in a diamond anvil cell. The GUI can work in either a live mode (during an experiment) or a post-processing mode and performs background subtraction, spatial correlation, and thermal calibration of the data before producing maps of temperature, emissivity, and their associated uncertainties, an image difference map (i.e., the change in the shape of the temperature field), and a variety of other visualisations derived from them. We describe the distribution, system requirements, and required hardware specific code modifications necessary to setup MIRRORS. We also describe the workflow of the software and its underlying methodologies and provide an example output as well as the results of benchmarking against a traditional spectroradiometric system of known accuracy.

A Comprehensive Review of High-Pressure Laser-Induced Materials Processing, Part I: Laser-Heated Diamond Anvil Cells

“…LH-DAC experiments have advantages over resistively-heated DACs in that the sample itself is heated directly, so localised extreme heating is possible without simultaneously affecting the diamond anvils or gasket chamber (v)-and sample temperatures can be measured in situ (through the anvils) [241]. In most LH-DAC configurations, significant thermal gradients may exist across extended samples, with reported values on the order of 10 7 -10 9 K/m [242][243][244][245][246]. Such gradients can drive solid-state diffusion within samples (and within the cell overall) [6,245,247].…”

A Practical Review of the Laser-Heated Diamond Anvil Cell for University Laboratories and Synchrotron Applications

“…Due to the presence of large thermal gradients and changes in the insulation conditions, in-homogeneous distributions of the T on the sample surfaces are often observed during LH-DAC experiments [129,130]. The actual determination of both the peak temperature and the temperature field can then become very useful.…”