An intelligent nitrogen-oxygen sensor comprising an induction chip, wherein the induction chip comprises a substrate unit, a printing function unit and a closed structural unit, wherein:
- the substrate unit comprises an upper zirconia substrate (1), a middle zirconia substrate (2) and a lower zirconia substrate (3);
- the printing function unit comprises a common external electrode (11), a main pump internal electrode (12), an auxiliary pump internal electrode (13), a mixed potential sensitive electrode (31), a measurement pump internal electrode (32), a reference air electrode (33), a first insulation coating layer (41), a second insulation coating layer (42), a heating circuit (43) and eight electrode contact points;
- the closed structural unit comprises a first measurement cavity (21), a second measurement cavity (22) and a reference air passage (23);
- the common external electrode (11) is connected with a common electrode contact point (111) through a lead wire, and is printed on an upper end surface of the upper zirconia substrate (1);
- the main pump internal electrode (12), the auxiliary pump internal electrode (13) and lead wires thereof are printed on a lower end surface of the upper zirconia substrate (1);
- the main pump internal electrode (12) and the auxiliary pump internal electrode (13) are respectively connected with a first electrode contact point (121) and a second electrode contact point (131), both of which are printed on the upper end surface of the upper zirconia substrate (1), through the lead wires via through-holes in the upper zirconia substrate (1);
- the mixed potential sensitive electrode (31) and the measurement pump internal electrode (32) are printed on an upper end surface of the lower zirconia substrate (3), and are respectively connected with a third electrode contact point (311) and a fourth electrode contact point (321) both of which are located at two sides of the lower zirconia substrate (3) through lead wires;
- the reference air electrode (33) and a lead wire thereof are printed on the upper end surface of the lower zirconia substrate (3), and the reference air electrode (33) is connected with a fifth electrode contact point (331) which is located at a lower end surface of the lower zirconia substrate (3) via a through-hole in the lower zirconia substrate (3);
- the first insulation coating layer (41) and the second insulation coating layer (42) are directly printed on the lower end surface of the lower zirconia substrate (3), and wrap the heating circuit (43);
- a length of the second insulation coating layer (42) is smaller than a length of the first insulation coating layer (41), such that the fifth electrode contact point (331), a sixth electrode contact point (431) and a seventh electrode contact point (432) are exposed to air;
- the first measurement cavity (21), the second measurement cavity (22) and the reference air passage (23) are provided on the middle zirconia substrate (2) through punching process, and a first diffusion barrier layer (11) and a second diffusion barrier layer (221) are provided on the middle zirconia substrate (2).