Abstract: The present disclosure provides a microphone, comprising a vibration pickup assembly configured to generate vibration; at least two acoustoelectric conversion elements configured to respectively receive the vibration of the vibration pickup assembly to generate an electrical signal; at least one sampling module configured to convert electrical signals output by different acoustoelectric conversion elements of the at least two acoustoelectric conversion elements into digital signals, wherein, each of the at least two acoustoelectric conversion element has a resonant frequency, and a difference between resonant frequencies of two of the at least two acoustoelectric conversion elements is greater than 1000 Hz.

Abstract: The present disclosure provides a microphone, comprising a shell structure, a vibration pickup assembly, a vibration pickup assembly, wherein the vibration pickup assembly is accommodated in the shell structure and generates vibration in response to an external sound signal transmitted to the shell structure, and at least two acoustoelectric conversion elements configured to respectively receive the vibration of the vibration pickup assembly to generate an electrical signal, wherein the at least two acoustoelectric conversion elements have different frequency responses to the vibration of the vibration pickup assembly.

Abstract: Provided in the present invention are a geologically constrained infrared imaging detection method and system for an urban deeply-buried strip-like passage, pertaining to the crossing fields of geophysics and remote sensing technology.

Abstract: Methods and systems are provided for inverted detection and positioning of a strip-like subterranean tunnel in a mountain mass, pertaining to the field combining theories of the discipline of geophysics and remote sensing technology.