Wireless sensor and method for tunnel seismic wave signal acquisition

Abstract

The invention provides a wireless sensor and method for tunnel seismic wave signal acquisition, and the wireless sensor comprises a collector and a receiver, the collector comprises a plurality of input analog channels, each input analog channel is connected to a first controller through an analog / digital converter, and the first controller is connected with a first wireless module; the receiver comprises a second wireless module, the second wireless module is connected with a second controller, the second controller is connected with a plurality of digital / analog converters, each digital / analog converter is connected with an analog signal buffer, and the other end of each analog signal buffer is connected with a voltage / current selection converter; and the voltage / current selection converter is connected with an analog output channel, so that the defect of inconvenient wiring of a wired analog signal acquisition system is avoided, and meanwhile, the advantages of small size and lightweight of a wireless instrument are considered.

Description

technical field [0001] The disclosure belongs to the technical field of wireless sensors, and in particular relates to a wireless sensor and a method for collecting tunnel seismic wave signals. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Usually, various unfavorable factors such as narrow tunnel space, high environmental noise, and serious electromagnetic interference make the use of instruments in the Sui Road very limited. For example, the movement of on-site construction machinery may cause damage to the laid cables, or through wired The signal-to-noise ratio becomes worse after the transmission of voltage-type signals; another example is because TBMs, shield machines, etc. are mobile construction equipment, so the detection points must move with them, requiring the detector to be installed / removed at any time. For wired instrument...

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Problems solved by technology

[0003] Usually the narrow space of the tunnel, high environmental noise, serious electromagnetic interference and other unfavorable factors make the use of instruments in the Sui Road very limited. The signal-to-noise ratio becomes worse after the transmission of voltage-type signals; another example is that because TBMs and shield machines are mobile construction equipment, the detection points must move with them, requiring the detector to be installed / disassembled at any time. For wired instruments use, a lot of work

[0004] In order to be used in tunnel construction, seismic wave detection instruments used on the ground are often transformed and used as tunnel seismic wave advanced detection technology instruments. Most of these instruments are wired analog signal transmission methods, and even wireless instruments are mostly single-channel instruments. , or the number of analog signal channels is small and fixed and cannot be modified; when a single-channel instrument is combined into a multi-channel instrument, the structure is complex and it is difficult to achieve data acquisition synchronization and system consistency

[0005] Among them, for wired instruments, the analog signal output by the geophone needs to be transmitted to the analog input terminal of the acquisition system through a cable of tens of meters (the distance of the longest detection point can reach more than 70 meters). In order to improve the transmission quality of the signal, usually A multi-core shielded cable with a large cross-sectional area should be used. The weight of the cable itself is very large. It is extremely inconvenient for the construction personnel to collect / release the cable, and the workload is large and the efficiency is low.

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