Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments

Abstract

Although the streaked optical pyrometer (SOP) system has been widely adopted in shock temperature measurements, its reliability has always been of concern. Here, two calibrated Planckian radiators with different color temperatures were used to calibrate and verify the SOP system by comparing the two calibration standards using both multi-channel and single-channel methods. A high-color-temperature standard lamp and a multi-channel filter were specifically designed for the measurement system. To verify the reliability of the SOP system, the relative deviation between the measured data and the standard value of less than 5% was calibrated out, which demonstrates the reliability of the SOP system. Furthermore, a method to analyze the uncertainty and sensitivity of the SOP system is proposed. A series of laser-induced shock experiments were conducted at the ‘Shenguang-II’ laser facility to verify the reliability of the SOP system for temperature measurements at tens of thousands of kelvin. The measured temperature of the quartz in our experiments agreed fairly well with previous works, which serves as evidence for the reliability of the SOP system.

Effect of pulse energy on the dynamic development of spark-plasma-jet driven by nanosecond high-voltage pulse

“…The descending part of the radiation spectrum between 500 nm and 610 nm is calculated by continuum emissivity of Bremsstrahlung and recombination radiation to obtain the electron temperature [58]. Figure 11 shows a typical calculated continuous spectrum within 500 nm and 610 nm at the pulse energy of 160 J, which matches well with the substrate of measured spectrum.…”

Shock Hugoniot Data for Water up to 5 Mbar Obtained with Quartz Standard at High-Energy Laser Facilities

“…To measure the shock temperature, we used SOP [28][29][30]. e self-emission of the shocked sample at wavelength 450 nm with 38 nm bandwidth was recorded spatially and temporally resolved, using an absolutely calibrated SOP.…”