Although Gardon gauges are widely used diffusion type heat
flux gauges and have been extensively studied, the use of Gardon
gauges in harsh environments is still restricted for transient
applications. Gardon gauges as well as Schmidt–Boelter heat flux
gauges are usually regarded as quasi-steady-state sensors with a
limited frequency response and are rarely used in transient applications. It’s unable to obtain accurate heat fluxes using Gardon
gauges in transient applications although the merit of high heat
flux and long working times measurements is remarkable. Therefore, this paper describes an optimized measurement method of
fast transient radiative heat fluxes based on a traditional Gardon
gauge. The measurement accuracy of the Gardon gauges is also
greatly improved for transient measurements. The merit of
this work is to convert a traditional Gardon gauge with a limited
frequency response to a fast-response heat-flux sensor which also
has a wide range of heat fluxes and can be operated with long
working times in thermal environments. The measurement principles of Gardon gauges are analyzed to improve the measurement
method for transient heat fluxes. Numerical simulations and
experimental measurements of typical heat fluxes verify the applicability and effectiveness of the measurement method. The
analysis provides a useful reference for accurate measurement of
transient heat fluxes and improves the measurement ability of
Gardon gauges