SU1436079A1 - Source receiver - Google Patents

Abstract

The invention relates to a measurement technique, in particular to instruments for measuring vibration parameters. as well as fluctuations in soil and structures. The goal is to simplify the design and expand the range of variation of the natural frequency. By way of The NJL inside the case of a magnetically flexible material of inertial mass in the form of a cylindrical permanent magnet, magnetized along its longitudinal axis and coaxially with the case, simplifies the design of the magnetic suspension, providing the necessary degree of aesthesia. By inserting cylindrical elements made of magnetically soft material into the body, the natural frequency of the geophone is continuously adjustable. 1 hp f-ln, 1 ill. (L

Description

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ABOUT

The invention relates to measuring fexHHKe, in particular, to instruments for measuring vibration parameters as well as vibrations of the soil and structures.

The aim of the invention is to simplify the design and expand the frequency range of the natural oscillations.

The drawing schematically shows a geophone.

; The seismic receiver has a housing 1 / made in the form of a permanent magnet

Thus, between the mass 2 and the cylinder 5 in the transverse direction, the magnetic forces of attraction act, i.e., the cylinder 5 performs the function of the transverse magnetic stretch. In this case, in the longitudinal direction, the position of the mass 2 will be stable, and its instability in the transverse direction is compensated by the transverse centralizers 4, as a result of which this transverse magnetic plane acts as a magnetic suspension, the rigidity of which can be arbitrarily

| that inertial mass 2 connected to change by changing the geometry

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Case 1 sensor 3 longitudinal displacement (inertial mass 2 moving, transverse 1 centering 4 inertial weights 2 relative to body 1, transverse I magnetic stretch, complete 20 IB form of ferromagnetic hollow cylinder ipa 5 with variable geometry The change in the geometry of the cylinder 5 is achieved by its 4 implementation in the form of cylindrical elements 25 displaced one relative to another, 6 the central of which i is connected to the housing 1. The transverse centering of the mass 2 is accomplished by connecting with May -; SOY 2 longitudinal axes 7 prop A gap through the JQ. hole in the lower and upper parts of the housing t, as a result of which the pump 2 has the ability to move in the longitudinal direction i and does not have the ability to move in the transverse direction.

The sensor 3 is rigidly connected to the housing 1, and is designed to detect longitudinal movements of the mass 2 And can be performed, for example, in the form of an inductance coil. .

The seismic receiver works as follows.

Under vibration effects, the body 1 is displaced relative to the inertial mass 2 along its axis due to the NECHNICAL magnet suspension of the specified mass relative to this body. The magnetic suspension is caused by the action of transverse magnetic stretching, i.e. due to the effect of transverse radial attractive forces between mass 2 and cylinder 5 connected to body 1. cylinder 5 is made of ferromagnetic material, as a result of which a magnetic field is induced under the influence of mass 2, which is a permanent magnet.

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cylinder 5 (i.e., by moving cylindrical elements 6 relative to each other). Sensor 3 converts the magnitude of the longitudinal transfer of mass 2 or the amount produced from this movement over time into a proportional electric sial.

In a seismic receiver, it is possible to change the self-frequency of oscillations of the moving system by changing the geometrical dimensions of the ferro-magnetic cylinder. This allows you to adjust the natural frequency after the completion of the assembly of the geophone, to increase the settings exactly for the specified hour. Toto of natural oscillations of a seismic detector for a new value depending on the type of seismic exploration

Claims (2)

1. A seismic receiver containing a central ferromagnetic body transverse magnetic tension, including an inertial mass, is made in the form of a cylindrical permanent magnet magnetized along its longitudinal axis, and a sensor for longitudinal movement of the inertial mass, the inertial mass fixed to the body on the transverse center of the tori, differing in that, in order to simplify the design of the expansion of the frequency spectrum of recorded oscillations, the transverse metal stretch is made by extending the magnet of the inertial mass s ext When the ferromagnetic body in such a time that magn magnetization axis is directed along the axis of translational movement and weight. change by changing geometry cylinder 5 (i.e., by moving cylindrical elements 6 relative to each other). Sensor 3 converts the magnitude of the longitudinal movement of mass 2 or the value of the derivative of this time displacement into a proportional electrical signal. In the seismic receiver, it is possible to vary the natural frequency of the moving system by changing the geometrical dimensions of the ferro-magnetic cylinder. This allows you to adjust the natural frequency after the completion of the assembly of the seismic receiver, to increase exactly, the settings for a given frequency: this natural oscillation of the seismic receiver to a new value depending on the type of seismic exploration. Formula of rete n i 1. A seismic receiver containing a cylindrical ferromagnetic body, transverse magnetic tension, including an inertial mass, made in the form of a permanent magnet of a cylindrical shape, magnetized along its longitudinal axis, and a sensor for longitudinal movement of the inertial mass, with the inertial mass fixed to the body on transverse centralizers, characterized in that, in order to simplify the design and expand the frequency spectrum, Strengthened oscillations, transverse magnetic stretching is performed by placing a magnet of inertial mass inside the ferromagnetic body in such a way that the axis of magnetization of the magnet is directed along the axis of movement of the inertial mass. 2. A seismic receiver in accordance with claim 1, 1, and t - which is characterized by the fact that, in order to ensure the possibility of a smooth adjustment of the natural frequency, int. The casing has at least one cylindrical element made of ferromagnetic material with the possibility of their telescopic movement scheni