Transient heat flux density remote measurement method and system based on thermomagnetic effect

The invention discloses a transient heat flux density remote measurement method and system based on a thermomagnetic effect, and belongs to the field of surface heat flux density measurement. The method comprises the following steps: selecting a magnetic film with a preset thickness, measuring a magnetic temperature curve under saturation magnetization intensity, and fitting to obtain saturation magnetization intensity M (0), a thermal demagnetization curve parameter gamma and a magnetization temperature dependence effective index beta of the magnetic film under absolute zero degree; the surface of an object to be measured is covered with a magnetic film, a measuring coil is placed on the back face, not making contact with heat flow, of the magnetic film, the heat flow is applied to the magnetic film, the induced electromotive force of the measuring coil at the moment is measured, and the heat flow density is inverted according to the relation that integration of induced voltage is inversely proportional to b