Underwater acoustic emission burning rate testing device for low-frequency weak-combustion signal propellant

The invention discloses a low-frequency weak-combustion signal propellant underwater acoustic emission combustion rate testing device, which belongs to the technical field of solid propellant combustion rate testing, and comprises a combustion chamber, a damping layer, a sensor module, a signal pre-amplification module and a data processing module, the sensor module collects sound wave signals generated by propellant combustion, converts the collected sound wave signals into charge signals and sends the charge signals to the signal pre-amplification module, the signal pre-amplification module converts the charge signals into voltage signals, and accurate frequency selection of the voltage signals is achieved through signal amplification and filtering. Interference signals outside a preset frequency range are filtered out, the filtered voltage signals are subjected to frequency-voltage conversion, the converted voltage is output and sent to the data processing module, and the data processing module judges the