When a leak or vacuum leak occurs in any pressurized gas, turbulence is created by the gas flow, and the turbulence emits acoustic energy, which covers the audible domain and the ultrasonic frequency band.In the general environment, noisy ambient noise can very easily mask the acoustic signal in the audible domain.So through the CRY2623 imager to detect the possible ultrasonic frequency band sound source in the environment, you can quickly locate the location of the gas leakage.