Strain gauge pressure sensor and manufacturing method thereof

A strain gauge pressure sensor, comprising:

• a base with a through-going pressure channel;
• a pressure seat with a through-going pressure guiding channel, wherein the pressure seat is provided on the base, and the pressure guiding channel communicates with the pressure channel;
• an elastic diaphragm provided at an end of the pressure seat away from the base and corresponding to the pressure guiding channel, wherein the elastic diaphragm is deformable in response to a change of pressure;
• a prefabricated element provided on a surface of the elastic diaphragm, wherein the prefabricated element is a prefabricated molded sheet;
• a strain gauge provided on a surface of the prefabricated element away from the elastic diaphragm, wherein the strain gauge is configured to generate an electrical signal in response to deformation of the elastic diaphragm wherein the strain gauge is connected to the elastic diphergan through the prefabricated element and the strain gauge, the prefabricated element, and the elastic diaphragm are bonded together to form an integral structure:
• the strain gauge the prefabricated sheet, and the pressure seat have a same coefficient of thermal expansion;
• and
• a circuit board electrically connected to the strain gauge to receive and transmit the electrical signal from the strain gauge.