High-time-accuracy source seismic hammer

Abstract

The invention discloses a high-time-accuracy seismic source hammer which comprises a hammer head, a hammer handle, a trigger tongue piece and a vibration signal receiver. The hammer head is provided with a hammer cavity allowing the trigger tongue piece to be contained, a first electrode plate is fixed on the top wall of the sealed end of the hammer cavity, a second electrode plate is fixed on the tail of the trigger tongue piece, and a longitudinal gap exists between the second electrode plate and the first electrode plate. When external striking is applied, the first electrode plate and the second electrode plate make contact, and generated electric signals are transmitted to a collecting instrument. The high-time-accuracy hammer can ensured the integrity of records obtained through seismic exploration, the excitation time of a seismic source can be confirmed accurately, time accuracy is ensured, exploration precision is ensured accordingly, and thus the high-time-accuracy source hammer is beneficial to the accuracy of seismic methods such as port and bridge concrete strength detection which have high requirements for time accuracy.

Description

Technical field

[0001] The invention relates to a seismic source hammer used in the field of engineering seismic exploration (port engineering and bridge concrete strength detection, site non-destructive detection). Background technique

[0002] In the fields of engineering seismic exploration such as port engineering and bridge concrete strength testing, site non-destructive testing, etc., the accuracy usually required is decimeter level or even more accurate. Since one of the main parameters used by this method is the propagation time of seismic waves in the medium, the time accuracy is closely related to the detection accuracy. For example, the seismic wave velocity of C50 concrete is 4000-4300 m / s, and the detection accuracy of 0.1 m is required, so the time accuracy should be controlled within 20 microseconds.

[0003] The trigger circuit in the acquisition instrument is a circuit comparator. When the input trigger signal meets the preset trigger conditions of the acqu...

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