Curved conformal wireless passive heat flux sensor and preparation method thereof

A curved conformal wireless passive heat flux sensor, comprising metal wires (10) disposed sequentially from a bottom upward, a silicon carbide substrate (20), a sensitive layer (30), and a thermal resistance layer (40);

• wherein the sensitive layer (30) comprises a thermopile (35), an inductor (341), a capacitor (342) and a microstrip antenna (33), and wherein the thermopile, the inductor, the capacitor and the microstrip antenna are all made of metal by a ink direct writing process;
• one end of the thermopile (35) is connected to the capacitor (342), and the microstrip antenna (33) and the inductor (341) are connected to the other end of the thermopile (35);
• the thermal resistance layer (40) has at least one opening (41) to expose a thermal junction of the thermopile (35), and the metal wire (10) connects the inductor (341) and the capacitor (342) to form a resonant circuit (34);
• wherein the thermopile (35) comprises multiple pairs of head-to-tail thermocouples, wherein:
• each pair of head-to-tail thermocouples comprises a connected first electrode (31) and a second electrode (32);
• the first electrode (31) is made of platinum, and the second electrode (32) is made of platinum-rhodium;
• the silicon carbide substrate (20) adopts silicon carbide ceramic fiber;
• a cross section of the silicon carbide substrate (20) is a quadrilateral;
• the thermopile (35) is disposed around three edges of the silicon carbide substrate (20);
• the microstrip antenna (33) is disposed on a remaining side of the silicon carbide substrate (20);
• and, the thermopile (35) and the microstrip antenna (33) surround the inductor (341) and the capacitor (342);
• and
• the thermopile (35) is configured to generate a voltage signal corresponding to a heat flux temperature;
• the resonant circuit (34) is configured to modulate the voltage signal into a high-frequency signal;
• and, the microstrip antenna (33) is configured to propagate the high-frequency signal outward in a form of a radio wave.