Novel broadband geophone suitable for severe use environment

Abstract

The invention relates to the technical field of earthquake monitoring, in particular to a novel broadband geophone suitable for severe use environments, and is characterized in that a lower support piece is arranged on a lower fixed pole plate in a penetrating manner, a movable pole plate is arranged at the upper end of the lower fixed pole plate, a mass block is connected to the upper end of the movable pole plate, and two ends of the mass block are in contact with the upper support piece and the lower support piece respectively; a first capacitor is formed between the upper fixed plate and the upper side surface of the movable plate; and a second capacitor is formed between the lower fixed plate and the lower side surface of the movable plate. A first capacitor is formed between the upper fixed pole plate and the upper side face of the movable pole plate, a second capacitor is formed between the lower fixed pole plate and the lower side face of the movable pole plate, and when external vibration exists, the mass block drives the movable pole plate to move, so that the difference value of the first capacitor and the second capacitor is changed; the differential capacitor design can symmetrically counteract zero drift caused by temperature, full temperature range stability is achieved, temperature interference is reduced, and detection accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of earthquake monitoring technology, and in particular to a novel broadband seismic detector suitable for harsh operating environments. Background Technology

[0002] Seismic detectors are sensors used in geophysical exploration, especially seismic exploration, to detect and record ground vibrations caused by artificial sources (such as explosives or seismic vehicles) or natural earthquakes. They are key equipment connecting underground geological information with the ground acquisition system.

[0003] Currently, in seismic detectors operating in environments with significant temperature variations, the difference in thermal expansion coefficients between the internal structural materials and packaging materials of the sensing unit causes temperature fluctuations that are difficult to eliminate, resulting in micro-deformations in the internal structure. These mechanical deformations directly alter the initial equilibrium position and stress distribution of the sensor. Simultaneously, the electrical parameters of electronic components also shift with temperature, leading to variations in circuit characteristics such as reference voltage drift and gain changes. This coupled temperature effect between the mechanical structure and the electronic system is reflected in the output signal, resulting in a significant zero-point drift phenomenon, which seriously affects the accuracy of the sensor in field surveys during long-term monitoring. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies where temperature fluctuations can cause micro-deformations in the internal structure that are difficult to eliminate, thus reducing the accuracy of detection. In this invention, a novel broadband seismic detector suitable for harsh operating environments is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel broadband seismic detector suitable for harsh operating environments is designed, comprising a magnetic sleeve, an upper fixed electrode plate fixedly connected to the upper end of the magnetic sleeve, and a lower fixed electrode plate fixedly connected to the bottom end of the magnetic sleeve. An upper support member is provided through the upper fixed electrode plate, and a lower support member is provided through the lower fixed electrode plate. A movable electrode plate is provided at the upper end of the lower fixed electrode plate, and a mass block is connected to the upper end of the movable electrode plate. The two ends of the mass block are in contact with the upper support member and the lower support member, respectively. A first capacitor is formed between the upper fixed electrode plate and the upper side of the movable electrode plate, and a second capacitor is formed between the lower fixed electrode plate and the lower side of the movable electrode plate.

[0007] Preferably, the mass block includes an inner frame, which is fixedly connected to the upper end of the moving pole plate. An electromagnetic induction coil is provided on the inner frame. Mounting components are provided at both ends of the inner frame. The two mounting components are in contact with the upper support and the lower support respectively. A magnet is provided between the two mounting components. Each mounting component is provided with an elastic sensitive element. The two elastic sensitive elements are in contact with the upper support and the lower support respectively.

[0008] Preferably, the first elastic sensitive element includes a plurality of spring sheets, each of which is connected at equal intervals along the axial direction with a plurality of cantilever beams, and the cantilever beams on adjacent spring sheets are staggered and connected by a plurality of elastic connectors, and the spring sheets are in contact with the upper support and the lower support.

[0009] Preferably, the spring sheet and the cantilever beam are an integral structure.

[0010] Preferably, the copper wires leading out of the upper and lower fixed electrode plates are distributed in the form of spring coils.

[0011] Preferably, the mounting component has an epoxy resin layer at the contact point with the magnet.

[0012] The present invention proposes a novel broadband seismic detector suitable for harsh operating environments, with the following advantages:

[0013] A first capacitor is formed between the upper fixed plate and the upper side of the moving plate, and a second capacitor is formed between the lower fixed plate and the lower side of the moving plate. When there is external vibration, the mass block drives the moving plate to move, thereby changing the difference between the first capacitor and the second capacitor. The first capacitor and the second capacitor are designed as differential capacitors. The differential capacitor design can symmetrically cancel the zero-point drift caused by temperature, achieve full-temperature stability, reduce temperature interference, and improve the accuracy of detection. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a novel broadband seismic detector suitable for harsh operating environments proposed in this invention;

[0015] Figure 2 This is a cross-sectional structural schematic diagram of a novel broadband seismic detector suitable for harsh operating environments proposed in this invention;

[0016] Figure 3 This is a schematic diagram of the elastic sensing element in a novel broadband seismic detector suitable for harsh operating environments proposed in this invention.

[0017] In the diagram: 1. Magnetic sleeve; 2. Upper fixed electrode plate; 3. Lower fixed electrode plate; 4. Upper support; 5. Lower support; 6. Moving electrode plate; 7. Mass block; 71. Inner frame; 72. Electromagnetic induction coil; 73. Mounting component; 74. Magnet; 75. Elastic sensitive element; 751. Spring; 752. Cantilever beam; 753. Elastic connector. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example 1: Refer to Figure 1-2 A novel broadband seismic detector suitable for harsh operating environments includes a magnetic sleeve 1. An upper fixed electrode plate 2 is fixedly connected to the upper end of the magnetic sleeve 1, and a lower fixed electrode plate 3 is fixedly connected to the bottom end of the magnetic sleeve 1. The copper wires leading from the upper and lower fixed electrode plates 2 and 3 are distributed in a spring coil configuration. By increasing the effective length and elasticity of the copper wires, impact and vibration stress are absorbed, ensuring the continuity of electrical connection under high-impact environments. An upper support member 4 passes through the upper fixed electrode plate 2, and a lower support member 5 passes through the lower fixed electrode plate 3. Support 4 and lower support 5 are made of materials with matching thermal expansion coefficients to achieve stability across the entire temperature range. The upper end of the lower fixed plate 3 is provided with a moving plate 6, and the upper end of the moving plate 6 is connected to a mass block 7. The two ends of the mass block 7 are in contact with the upper support 4 and the lower support 5 respectively, ensuring that the impact force is transmitted to the magnetic sleeve 1 along the shortest and strongest path, avoiding direct stress on the mass block 7. A first capacitor is formed between the upper fixed plate 2 and the upper side of the moving plate 6, and a second capacitor is formed between the lower fixed plate 3 and the lower side of the moving plate 6.

[0020] Work process:

[0021] When there is external vibration, the mass block 7 drives the moving plate 6 to move, thereby changing the difference between the first capacitor and the second capacitor. The back-end circuit generates a voltage signal related to the external vibration through detection and feedback, which is then used by the acquisition circuit for digitization. The first capacitor and the second capacitor are designed as differential capacitors. The differential capacitor design can symmetrically cancel the zero-point drift caused by temperature, achieve full-temperature stability, reduce temperature interference, and improve the accuracy of detection.

[0022] Example 2: Seismic detectors are easily damaged by short-term high-acceleration impacts during transportation on rugged roads, indicating poor impact resistance. (Refer to...) Figure 2As another preferred embodiment of the present invention, the difference from embodiment 1 is that the mass block 7 includes an inner frame 71, which is fixedly connected to the upper end of the moving pole plate 6. An electromagnetic induction coil 72 is provided on the inner frame 71. Mounting parts 73 are provided at both ends of the inner frame 71. The two mounting parts 73 are in contact with the upper support 4 and the lower support 5, respectively. A magnet 74 is provided between the two mounting parts 73. An epoxy resin layer is provided at the contact point between the mounting parts 73 and the magnet 74, so that no displacement or loosening occurs under impact vibration. Each mounting part 73 is provided with an elastic sensitive element 75. The two elastic sensitive elements 75 are in contact with the upper support 4 and the lower support 5, respectively. When the upper support 4 and the lower support 5 press against the elastic sensitive element 75, the maximum displacement of the mass block is limited to within 0.9 mm. Under external impact force, the elastic sensitive element 75 remains in an elastic state and will not undergo plastic deformation or breakage, thus exhibiting high impact resistance.

[0023] Example 3: The first elastic sensing element 75 is prone to breakage upon impact and has low mechanical stiffness. (Refer to...) Figure 3 As another preferred embodiment of the present invention, the difference from embodiment 1 is that the first elastic sensitive element 75 includes a plurality of spring pieces 751, and a plurality of cantilever beams 752 are connected at equal intervals along the axial direction on each spring piece 751. The spring pieces 751 and the cantilever beams 752 are integral structures, and the cantilever beams 752 on adjacent spring pieces 751 are staggeredly connected by a plurality of elastic connectors 753. The spring pieces 751 are in contact with the upper support member 4 and the lower support member 5. After the spring pieces 751, the cantilever beams 752 and the elastic connectors 753 cooperate, the mechanical stiffness is improved, thereby improving the mechanical resonant frequency and thus improving the impact resistance.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A novel broadband seismic detector suitable for harsh operating environments, comprising a magnetic sleeve (1), wherein an upper fixed electrode plate (2) is fixedly connected to the upper end of the magnetic sleeve (1), and a lower fixed electrode plate (3) is fixedly connected to the bottom end of the magnetic sleeve (1), characterized in that, in: An upper support member (4) is provided through the upper fixed plate (2), and a lower support member (5) is provided through the lower fixed plate (3). A moving plate (6) is provided at the upper end of the lower fixed plate (3). A mass block (7) is connected to the upper end of the moving plate (6). The two ends of the mass block (7) are in contact with the upper support member (4) and the lower support member (5) respectively. A first capacitor is formed between the upper fixed plate (2) and the upper side of the moving plate (6), and a second capacitor is formed between the lower fixed plate (3) and the lower side of the moving plate (6).

2. The novel broadband seismic detector suitable for harsh operating environments according to claim 1, characterized in that, The mass block (7) includes an inner frame (71), which is fixedly connected to the upper end of the moving pole plate (6). An electromagnetic induction coil (72) is provided on the inner frame (71). Mounting parts (73) are provided at both ends of the inner frame (71). The two mounting parts (73) are in contact with the upper support (4) and the lower support (5) respectively. A magnet (74) is provided between the two mounting parts (73). An elastic sensitive element (75) is provided on each mounting part (73). The two elastic sensitive elements (75) are in contact with the upper support (4) and the lower support (5) respectively.

3. The novel broadband seismic detector suitable for harsh operating environments according to claim 2, characterized in that, The first elastic sensitive element (75) includes a plurality of spring pieces (751), and a plurality of cantilever beams (752) are connected at equal intervals along the axis of each spring piece (751). The cantilever beams (752) on adjacent spring pieces (751) are staggered and connected by a plurality of elastic connectors (753). The spring pieces (751) are in contact with the upper support (4) and the lower support (5).

4. The novel broadband seismic detector suitable for harsh operating environments according to claim 3, characterized in that, The spring sheet (751) and the cantilever beam (752) are an integral structure.

5. The novel broadband seismic detector suitable for harsh operating environments according to claim 1, characterized in that, The copper wires leading out of the upper fixed plate (2) and the lower fixed plate (3) are distributed in the form of spring coils.

6. The novel broadband seismic detector suitable for harsh operating environments according to claim 1, characterized in that, An epoxy resin layer is provided at the contact point between the mounting component (73) and the magnet (74).

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