A short-period seismic sensor

Abstract

The present invention belongs to the field of geological exploration, and specifically relates to a short-period seismic sensor, comprising: a differential capacitive pickup, comprising fixed plates on both sides and a moving plate located between the fixed plates, wherein the moving plate swings, causing the capacitance value to change, thereby receiving the motion waveform to obtain a seismic signal; and a symmetrical dual-magnet feedback regulator, comprising plates on both sides of the differential capacitive pickup, which collects a voltage proportional to the ground motion generated by the differential capacitive pickup, and generates an electromagnetic force of equal magnitude and opposite to the inertial force of the moving plate through a feedback coil, acting on the moving plate to adjust the moving plate to reset. The symmetrical dual-wire moving plate control structure can effectively reduce the characteristic frequency of the system and broaden the frequency band range of the seismic sensor.

Description

Technical Field

[0001] The present invention belongs to the field of geological exploration, and in particular relates to a short-period seismic sensor. Background Art

[0002] Short-period dense array passive source detection technology is increasingly becoming an important means of deep structure detection at home and abroad. It is widely used in mineral resource exploration, volcanic activity monitoring, microseismic precision positioning, and seismic faults. Compared with broadband seismic detection, it has the advantages of high resolution, time and cost saving, and green environmental protection.

[0003] The detection frequency band range of seismic sensors is their main reference factor, and how to achieve frequency spreading is also the main research direction of seismic sensors today. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a short-period seismic sensor that can effectively reduce the characteristic frequency of the system and widen the frequency band range of the seismic sensor.

[0005] The present invention is achieved in this way:

[0006] A short-period seismic sensor, comprising:

[0007] The differential capacitive vibration pickup includes fixed plates on both sides and a moving plate located between the fixed plates. When the moving plate swings, the capacitance value changes, thereby receiving the motion waveform to obtain the seismic signal.

[0008] A symmetrical dual-magnet feedback regulator is included on the two side plates of a differential capacitor vibration pickup. By collecting the voltage generated by the differential capacitor vibration pickup and proportional to the ground movement, an electromagnetic force with an equal magnitude and opposite direction to the inertia force of the moving plate is generated through the feedback coil to act on the moving plate to adjust the moving plate to reset.

[0009] Furthermore, the differential capacitive vibration pickup also includes: a metal wire and a spring sheet, wherein the dynamic electrode is clamped on the metal wire by a wire clamp, both sides of the metal wire are connected to two parallel spring sheets by a metal wire fixer, and the other end of the spring sheet is fixed.

[0010] Furthermore, it also includes a pendulum locking device, which includes an H-shaped metal plate, the two ends of the upper space of the H-shaped metal plate are fixedly connected to the moving pole plate, and the two ends of the lower space of the H-shaped metal plate are connected to two fixing nails through bearings, and the fixing nails are fixed on the outer frame.

[0011] Furthermore, the pendulum locking device also includes a locking structure arranged on both sides of the metal plate, and the locking structure includes a limit pin, and the limit pin is connected to the rotating device through a metal connecting rod. The rotating device is controlled to rotate by a motor to control the distance between the limit pin and the metal plate, thereby limiting the displacement of the metal block.

[0012] Furthermore, when there is no vibration signal, the fixed pole plates on both sides and the moving pole plate located between the fixed pole plates are parallel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The symmetrical dual-wire moving plate control structure effectively reduces the system's characteristic frequency and broadens the seismic sensor's frequency band. The pendulum locking device not only serves as a limiter but also a locking mechanism, effectively reducing structural complexity and raw material costs. The symmetrical dual-magnet feedback adjustment mechanism provides better control over the pendulum's stationary state than single-magnet feedback. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of a short-period seismic sensor is provided for an embodiment of the present invention;

[0016] Figure 2 A front view of a short-period seismic sensor is provided for an embodiment of the present invention;

[0017] Figure 3 A side view of a short-period seismic sensor is provided for an embodiment of the present invention.

[0018] Figure 4 A diagram showing the positional connection relationship between the short metal plate and the moving electrode plate is provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] See also Figure 1 Combine Figure 2 and Figure 3 As shown, the present invention includes a differential capacitor vibration pickup, a symmetrical dual-magnet feedback regulator and a pendulum locking device, wherein:

[0021] The differential capacitive vibration pickup includes two parallel and fixed fixed plates (a first fixed plate 1 and a second fixed plate 2) and a moving plate 3 located between the fixed plates. The moving plate shakes under the action of the vibration signal, thereby changing the distance and relative area between the two fixed plates. The swing of the moving plate causes the capacitance value to change, and the motion waveform of the seismic signal is obtained based on the change in capacitance value.

[0022] The differential capacitive vibration pickup also includes a metal wire 6 and a spring sheet 4. A moving plate 3 is clamped to the center of the wire via a wire clamp 7. The two sides of the wire 6 are connected to two parallel spring sheets via wire holders 5, with the other ends of the spring sheets fixed. When there is no vibration signal, the distance between the moving plate and the two spring sheets is the same. When the moving plate swings, the spring sheets bend. Due to the elastic force, the spring sheets return to their original position, causing the moving plate to return to its original position.

[0023] In order to prevent the vibration of the moving electrode plate, a symmetrical dual-magnet feedback regulator is set up, including the electrodes on both sides of the differential capacitor vibration pickup, which generates a voltage proportional to the ground movement by collecting the differential capacitor vibration pickup. The feedback coil 13 is wound around the magnet 12, and the feedback coil 13 and the magnet 12 are wrapped in a magnet shell 14. The feedback coil 13 receives and collects the voltage proportional to the ground movement generated by the differential capacitor vibration pickup, and generates an electromagnetic force with a direction opposite to the inertia force of the moving electrode plate and equal in magnitude through the feedback coil 13 and the magnet 12 to act on the moving electrode plate, thereby adjusting the micro-vibration of the moving electrode plate and resetting it.

[0024] The pendulum locking device includes: a motor 9, a rotating device 10, and a limiting pin 11. The metal plate 8 and the limiting pin 11 are placed in the rotating device 10 through a metal connecting rod. The motor 9 controls the rotating device 10 to rotate, driving the limiting pin to move closer to or away from the metal plate 8, thereby limiting the displacement of the metal plate 8. Figure 4 As shown, the metal plate 8 is H-shaped. The ends of the upper space of the H are fixedly connected to the moving electrode plate. The ends of the lower space of the H are connected to two fixing pins 16 via bearings 17. The fixing pins are fixed to the outer frame. During swinging, the metal block and the moving electrode plate swing together around the two fixing pins. The bearings reduce rotational friction.

[0025] During transportation, in order to prevent the metal block from swinging, the motor 9 controls the rotating device 10 to rotate, thereby driving the limiting pins to limit the displacement of the metal plate 8.

[0026] The entire structure is supported by a base 15 .

[0027] Working process of the present invention

[0028] Due to the slight vibration of the ground, the moving electrode plate 3 swings, and the first fixed electrode plate 1, the second fixed electrode plate 2, and the moving electrode plate 3 together constitute a differential capacitive vibration pickup. The displacement change of the moving electrode plate 3 causes the capacitance value to change, thereby achieving the purpose of vibration pickup detection.

[0029] In order to further reduce the characteristic frequency of the sensor and improve the frequency detection range of the seismic sensor, a symmetrical double-wire moving pole plate control structure and a symmetrical double-magnet feedback adjustment device are used to jointly reset the adjustment motor plate and keep the moving pole plate 3 stationary.

[0030] In order to facilitate transportation, it is necessary to ensure that the pendulum is in a stationary state when not in operation. The pendulum is locked using a pendulum locking device. By controlling the rotation of the motor 9, the rotating device 10 is driven to deflect, and the limiting pin 11 is moved closer to the connecting metal block 8, and finally locking is achieved.

[0031] The working principle of the present invention is:

[0032] The tiny vibration of the mechanical pendulum of the force balance feedback seismic sensor truly reflects the movement of the ground. The mechanical pendulum is located at the front end of the seismic sensor to detect the movement of the earth. The mechanical signal generated by the ground vibration is obtained by the mechanical pendulum and converted into an electrical signal through the vibration pickup.

[0033] The feedback principle is that the working coil of the vibration pickup generates a voltage proportional to the ground movement, which generates a feedback current through the feedback link. Under the action of the magnetic field, the feedback current generates an electromagnetic force with an equal magnitude and opposite direction to the inertia force of the mechanical pendulum through the feedback coil, which acts on the pendulum body, making the mass block basically remain motionless.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A short-period seismic sensor, characterized in that: The sensor includes: The differential capacitive vibration pickup includes fixed plates on both sides and a moving plate located between the fixed plates. When the moving plate swings, the capacitance value changes, thereby receiving the motion waveform to obtain the seismic signal. A symmetrical dual-magnet feedback regulator, including two plates on each side of a differential capacitor vibration pickup, collects a voltage proportional to the ground motion generated by the differential capacitor vibration pickup, and generates an electromagnetic force equal to and opposite to the inertial force of the moving plate through a feedback coil, acting on the moving plate to adjust the moving plate to reset. The differential capacitive vibration pickup further includes: a metal wire and a spring sheet, wherein the dynamic electrode plate is clamped to the metal wire by a wire clamp, and both sides of the metal wire are connected to two parallel spring sheets by a metal wire fixer, and the other ends of the spring sheets are fixed; and further includes a pendulum body locking device, the pendulum body locking device including an H-shaped metal plate, the two ends of the upper space of the H-shaped metal plate being fixedly connected to the dynamic electrode plate, and the two ends of the lower space of the H-shaped metal plate being connected to two fixing nails by bearings, and the fixing nails are fixed to the outer frame; When there is no vibration signal, the fixed pole plates on both sides and the moving pole plate located between the fixed pole plates are parallel.

2. The short-period seismic sensor according to claim 1, characterized in that: The pendulum locking device also includes a locking structure arranged on both sides of the metal plate, and the locking structure includes a limiting pin. The limiting pin is connected to the rotating device through a metal connecting rod. The rotating device is controlled to rotate by a motor to control the distance between the limiting pin and the metal plate, thereby limiting the displacement of the metal block.

Images