Standard heat flow sensor for radiation heat flow measurement

The invention discloses a standard heat flow sensor for radiation heat flow measurement, and belongs to the technical field of radiation heat flow measurement, the standard heat flow sensor comprises a shell, a heat sink, a first absorption cavity, a first thermopile and a diaphragm, the diaphragm is fixedly installed on one side of an opening of the shell, and the diaphragm is provided with a diaphragm hole; the heat sink is fixedly mounted in the shell, and the heat sink is provided with a water cooling channel for cooling; the first absorption cavity is of an open conical shell structure, the opening of the first absorption cavity is coaxially arranged in an inner cavity at one end of the heat sink in a sleeving mode in the direction facing the diaphragm hole, and an electric heating wire capable of being electrically connected with a power source is embedded between the inner wall face and the outer wall face of the first absorption cavity. The hot end of the first thermopile abuts against the open end of