Measurement of temperature in the laser heated diamond anvil cell: comparison between reflective and refractive optics

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

  • Author: Giampaoli, Ruggero

    Polytechnic University of Milan, Italy

  • Author: Kantor, Innokenty

    Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Mezouar, Mohamed

    European Synchrotron Radiation Facility, France

  • Author: Boccato, Silvia

    European Synchrotron Radiation Facility, France

  • Author: Rosa, Angelika D.

    European Synchrotron Radiation Facility, France

  • Author: Torchio, Raffaella

    European Synchrotron Radiation Facility, France

  • Author: Garbarino, Gaston

    European Synchrotron Radiation Facility, France

  • Author: Mathon, Olivier

    European Synchrotron Radiation Facility, France

  • Author: Pascarelli, Sakura

    European Synchrotron Radiation Facility, France

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In this article we present a direct comparison between reflective (Schwarzschild mirrors) and refractive (achromatic doublets) optics commonly used in spectroradiometric temperature measurements in laser heated diamond anvil cells. Emission spectra are fitted with the Planck's law and are further analysed with the two-colour technique; theoretical simulations are used to compare the temperature measurement accuracy of the two optical systems. The first result obtained is that achromatic doublets with large numerical aperture (NA approximate to 0.2) produce extensive accuracy errors in the full T range (1500-3000K). When reduced apertures (NA = 0.8) are used a good agreement is found with measurements from reflective optics up to 2600K while systematic differences (around 200K) appear at higher temperatures. However, these temperature differences cannot explain the discrepancies between the iron melting curves obtained in the past years using laser heated diamond anvil cells.
Original languageEnglish
JournalHigh Pressure Research
Volume38
Issue number3
Pages (from-to)250-269
Number of pages20
ISSN0895-7959
DOIs
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Laser heating, Temperature gradients, Spectroradiometry, Pyrometry, Chromatic aberrations, Melting curve

ID: 153085849