Absolute calibration of a streaked optical pyrometer at nanosecond time scale with a luminescent concentrator

M Nourry-Martin; A Denoeud; C Chollet; M Bonneau; T Vinci; A Ravasio; S Brygoo; S Darbon; F Balembois

doi:10.1063/5.0145506

Absolute calibration of a streaked optical pyrometer at nanosecond time scale with a luminescent concentrator

Rev Sci Instrum. 2023 Aug 1;94(8):083502. doi: 10.1063/5.0145506.

Authors

M Nourry-Martin^{1

2}, A Denoeud¹, C Chollet¹, M Bonneau¹, T Vinci³, A Ravasio³, S Brygoo¹, S Darbon¹, F Balembois²

Affiliations

¹ CEA, DAM, DIF, F-91297 Arpajon, France.
² Université Paris-Saclay, Institut d'Optique Graduate School, CNRS, Laboratoire Charles Fabry, 91127 Palaiseau, France.
³ LULI, CNRS, CEA, Sorbonne Université, Ecole Polytechnique-Institut Polytechnique de Paris, F-91128 Palaiseau, France.

PMID: 38065135
DOI: 10.1063/5.0145506

Abstract

The Streaked Optical Pyrometer (SOP) is a visible diagnostic widely used to study the warm dense matter regime at high energy laser facilities, gas guns, or ion accelerators. It is usually coupled with a Velocity Interferometer System for Any Reflector (VISAR) diagnostic for simultaneous shock wave velocity, reflectivity, and temperature measurements to study the Equation of State (EOS) of materials. While VISAR is a well-mastered technology that provides velocity measurements with low relative uncertainties (close to percent), SOP diagnostics still suffer from high imprecision. In this article, we present a new calibration method in order to obtain absolute temperature measurements with reduced uncertainties. This approach is based on a novel light source: a Ce:YAG luminescent concentrator pumped by LEDs. This device produces enough optical power for calibration at the nanosecond sweep duration of the streak camera. As a demonstration, it has first been installed at the LULI facility and tested on quartz samples shocked at temperatures above 4000 K.