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

Ruggero Giampaoli*, Innokenty Kantor, Mohamed Mezouar, Silvia Boccato, Angelika D. Rosa, Raffaella Torchio, Gaston Garbarino, Olivier Mathon, Sakura Pascarelli

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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

Keywords

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

Cite this

Giampaoli, Ruggero ; Kantor, Innokenty ; Mezouar, Mohamed ; Boccato, Silvia ; Rosa, Angelika D. ; Torchio, Raffaella ; Garbarino, Gaston ; Mathon, Olivier ; Pascarelli, Sakura. / Measurement of temperature in the laser heated diamond anvil cell: comparison between reflective and refractive optics. In: High Pressure Research. 2018 ; Vol. 38, No. 3. pp. 250-269.
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title = "Measurement of temperature in the laser heated diamond anvil cell: comparison between reflective and refractive optics",
abstract = "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.",
keywords = "Laser heating, Temperature gradients, Spectroradiometry, Pyrometry, Chromatic aberrations, Melting curve",
author = "Ruggero Giampaoli and Innokenty Kantor and Mohamed Mezouar and Silvia Boccato and Rosa, {Angelika D.} and Raffaella Torchio and Gaston Garbarino and Olivier Mathon and Sakura Pascarelli",
year = "2018",
doi = "10.1080/08957959.2018.1480017",
language = "English",
volume = "38",
pages = "250--269",
journal = "High Pressure Research",
issn = "0895-7959",
publisher = "CRC Press/Balkema",
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}

Giampaoli, R, Kantor, I, Mezouar, M, Boccato, S, Rosa, AD, Torchio, R, Garbarino, G, Mathon, O & Pascarelli, S 2018, 'Measurement of temperature in the laser heated diamond anvil cell: comparison between reflective and refractive optics', High Pressure Research, vol. 38, no. 3, pp. 250-269. https://doi.org/10.1080/08957959.2018.1480017

Measurement of temperature in the laser heated diamond anvil cell: comparison between reflective and refractive optics. / Giampaoli, Ruggero; Kantor, Innokenty; Mezouar, Mohamed; Boccato, Silvia; Rosa, Angelika D.; Torchio, Raffaella; Garbarino, Gaston; Mathon, Olivier; Pascarelli, Sakura.

In: High Pressure Research, Vol. 38, No. 3, 2018, p. 250-269.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Measurement of temperature in the laser heated diamond anvil cell: comparison between reflective and refractive optics

AU - Giampaoli, Ruggero

AU - Kantor, Innokenty

AU - Mezouar, Mohamed

AU - Boccato, Silvia

AU - Rosa, Angelika D.

AU - Torchio, Raffaella

AU - Garbarino, Gaston

AU - Mathon, Olivier

AU - Pascarelli, Sakura

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - Laser heating

KW - Temperature gradients

KW - Spectroradiometry

KW - Pyrometry

KW - Chromatic aberrations

KW - Melting curve

U2 - 10.1080/08957959.2018.1480017

DO - 10.1080/08957959.2018.1480017

M3 - Journal article

VL - 38

SP - 250

EP - 269

JO - High Pressure Research

JF - High Pressure Research

SN - 0895-7959

IS - 3

ER -