Technical Physics Letters
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- 2022
Changes in the dynamic characteristics of heat flux sensors based on anisotropic thermoelements in shock tube experiments
Popov P. A.
1, Masyukevich A. V.1, Kolesnik E. V.
2, Podlaskin A. B.
1
1Ioffe Institute, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
Email: pavel.popov@mail.ioffe.ru, am16590@yandex.ru, kolesnik_ev@mail.ru, a.podlaskin@mail.ioffe.ru
A change in the dynamic characteristics of sensors on anisotropic thermoelements made of a bismuth single crystal was discovered when measuring intense heat fluxes (>1 MW/m2) in experiments on shock tubes in the case of using air as a working gas. A noticeable increase in the response time to thermal influence, as well as distortion of the shape and amplitude of the electrical signal and the heat flux calculated from it, are caused by the formation in thermoelements of a near-surface defective layer <1 μm thick, which is not involved in the generation of thermopower. This may limit the conditions for applicability of the sensor in experiments on shock tubes and requires periodic calibration of the sensor against the reflected shock wave to monitor the condition of the working surface and the value of the volt-watt coefficient Keywords: heat flux, shock tubes, sensors based on anisotropic thermoelements, bismuth.
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