High-temperature and high-pressure sound wave acoustic emission sensor and detection method

The invention discloses a high-temperature and high-pressure acoustic emission sensor and a detection method and relates to the technical field of acoustic emission. The high-temperature and high-pressure sound wave acoustic emission sensor comprises a pressure-resistant sensor shell, two metal coupling pieces connected with the pressure-resistant sensor shell and a PET-based outer heat insulation film wrapping the pressure-resistant sensor shell and the metal coupling pieces, and a containing cavity is defined by the pressure-resistant sensor shell and the metal coupling pieces. The two metal coupling sheets are respectively connected with a temperature calibration piezoelectric ceramic and a test piezoelectric ceramic, a signal amplifier and two thermoelectric refrigeration sheets are arranged in the accommodating cavity, the refrigeration surfaces of the thermoelectric refrigeration sheets are attached to the temperature calibration piezoelectric ceramic and the test piezoelectric ceramic, and the signal a