HEAT FLOW SENSOR WITH TRANSVERSE TEMPERATURE GRADIENT AND METHOD OF MANUFACTURING THEREOF Russian patent published in 2024 - IPC G01K17/20 

FIELD: physics.

SUBSTANCE: invention relates to the field of thermophysical measurements and can be used to measure heat flows on the surface of various objects, in particular, during measurement of non-stationary heat flows under conditions of action of aerodynamic loads during performance of both ground and flight thermal and heat resistance tests of structural elements of high-speed aircraft and objects of space equipment, as well as for control of heat flows during tests. Disclosed is a heat flow sensor with a transverse temperature gradient (TTG), comprising a device for attachment to a test object, a differential thermocouple in the form of a housing made from a first high-heat-conductivity thermocouple metal, receiving end of which is equipped with a cylindrical cavity connected by an axial channel containing a coaxial electrically insulating bushing, with another cavity located on the other end of the housing, at that, in the receiving end cylindrical cavity there is a heat-absorbing element (HAE) in the form of a thin disk from a second thermocouple metal, two electrodes from a first metal, one of which is welded to the centre of the HAE disc, and the other to the TTG body, while the TTG body on the outer side is equipped with a thread and a hexagonal or tetrahedral head for a wrench, wherein the TTG housing is electrically connected to the HAE disc by means of an annular closed penetration seam placed on the TTG housing outer surface in the HAE disc plane, wherein the receiving end of the TTG housing is equipped with a polished or coated with a heat-reflecting coating annular surface, and the output cavity for the output of the electrodes is filled with a heat-resistant sealant and is equipped with a sealed collector for output of the electrodes. TTG manufacturing method, including TTG housing, coaxial electrically insulating bushing, HAE, welding of one electrode to TTG housing, attachment of HAE to TTG housing and sensor assembly, at that, the HAE is placed in the cylindrical cavity of the receiving end of the TTG and is rolled up in the housing, and on the receiving part of the TTG end, an annular surface is formed, after which on the outer surface of the TTG body in the plane of the HAE disc in the process medium, a closed laser annular penetrated weld is formed, the bottom of the molten bath of which is connected to the generatrix of the HAE disc.

EFFECT: development of a gradient heat flow sensor and a technology that reduces the level of unrecoverable defects, ease of use of the sensor and providing high accuracy of measuring heat flow during thermal tests of aircraft elements in radiation heating installations.

3 cl, 5 dwg