A high-resolution geophone and its manufacturing method

Abstract

The invention relates to a high-resolution earthquake detector and a manufacturing method thereof. With the adoption of a detector structure, an upper cover with a guide positioning part, a magnetic system consisting of upper and lower magnetic boots and magnetic steel, a spring-mass system consisting of a coil frame with a winding and a spring, a lower cover, and a shell are coaxial in an assembling process, so that the detector distortion can be effectively reduced. The matching condition ensures that inner and outer rings of upper and lower spring sheets are at a horizontal position after being assembled; the upper and the lower spring sheets are not additionally stressed by external force; and each part inside the detector with a sealed opening is compactly matched without release, so that the distortion of the detector can be reduced. The natural frequency of single spring can be directly detected, and the two springs with equal frequencies can be selected to be matched in pair, so as to ensure the consistency of the spring, and reduce the allowance range and the distortion. With the adoption of a method for directly testing the frequency, the natural frequency of the earthquake detector can be tested before the opening of the detector is sealed, so that the allowance range of the detector can be further reduced.

Description

technical field [0001] The invention relates to a geophone and a manufacturing method thereof, in particular to a high-resolution geophone and a manufacturing method thereof. Background technique [0002] Seismic prospecting is the most important method for geophysical prospecting such as oil and coal. The geophone is a receiving device for seismic signals, which converts seismic energy into electrical signals for output. The most common geophone is the velocity geophone, which is typically a toroidal coil suspended by springs as a reference mass. Each end of the coil frame is equipped with a leaf spring, which positions the coil in a permanent position. In the magnetic field formed by the magnet assembly, the upper and lower covers, the magnet assembly and the casing are fixed, so that the coil forms a suspension system with a preset resonance frequency along the magnetic field axis. [0003] High-resolution seismic exploration requires seismic acquisition equipment to hav...

AI Technical Summary

Problems solved by technology

[0006] However, the current methods of reducing the distortion of the geophone and reducing the tolerance range of the parameters of the geophone cannot completely solve the problem

Residual distortion still has a great influence on the resolution of the data; and the test method using the spring elastic coefficient and supporting mass can only replace the natural frequency in an equivalent manner, and cannot perform precise control, so the tolerance range cannot be further reduced

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