Extremely-low-frequency power-free weak signal generator

Abstract

The invention relates to an extremely-low-frequency power-free weak signal generator. The extremely-low-frequency power-free weak signal generator comprises a body. A driving assembly, a voltage generating assembly and a collecting ring are arranged in the body; the voltage generation assembly is in clearance fit with the body, the driving assembly faces the voltage generation assembly and drives the voltage generation assembly to rotate in a mode of blowing out airflow, and the voltage generation assembly cuts a geomagnetic field when rotating to generate an electric signal; the voltage generation assembly is connected with the collector ring and outputs an electric signal through the collector ring. According to the structure provided by the invention, no external electric signal is input, the noise influence caused by the circuit at the signal end can be reduced, and the authenticity of the signal is improved. Besides, through the principle that the voltage generation assembly cuts the geomagnetic field to generate induced electromotive force, stable microvolt-level signals can be generated, and the test requirements of the geomagnetic ocean current meter front-end amplifier can be well met.

Description

Technical Field

[0001] The invention relates to the technical field of ocean current velocity testing, in particular to an extremely low frequency non-electrical weak signal generator. Background Art

[0002] The ocean accounts for about 71% of the world's surface area and contains rich biological resources, chemical resources, mineral resources and power resources. The development and utilization of marine resources has greatly promoted economic development. Therefore, grasping the characteristics of the marine geographical environment, preparing for navigation and resource exploration, and understanding and mastering the movement laws of the ocean have become one of the important conditions for the current development of the ocean. Accurate ocean current data can directly serve scientific research, fisheries, shipping, and marine disaster warning.

[0003] The acquisition of ocean current data is mainly achieved through current meters. According to the measurement principle, current meters can be divided into mechanical current meters, Doppler current meters and electromagnetic current meters. Among them, electromagnetic current meters can also be divided into artificial magnetic field current meters and geomagnetic current meters according to the source of the magnetic field. Geomagnetic current meters rely on the earth's own magnetic field to measure ocean currents. Since the earth's magnetic field is relatively stable, these changes can be used to infer the speed and direction of ocean currents. The advantage of geomagnetic current meters is that they do not require external devices to generate magnetic fields, and the frequency of the induced electromotive force after frequency modulation is basically fixed (commonly 16Hz), but the induced electromotive force generated by seawater cutting the geomagnetic field is small, only at the nanovolt (nV, i.e. 10-9V) level, so an extremely low-noise high-precision amplifier circuit is required at the front end of the geomagnetic current meter. At the same time, when designing and testing the circuit, a weak signal generator is also required to generate a nanovolt-level sine wave signal.

[0004] However, the weak signal generators currently on the market are mostly used in the fields of electrocardiogram and electroencephalogram measurement, and are not specifically designed for ocean current speed measurement. Due to the existence of external power supply, there is a large circuit noise, which will have a great impact on the test of the amplification circuit. Summary of the invention

[0005] Based on this, it is necessary to provide an extremely low frequency, non-electrical weak signal generator that does not require external power supply and reduces the noise impact caused by external circuits to address the above technical problems.

[0006] An extremely low frequency non-electric weak signal generator comprises: a body; a driving component, a voltage generating component and a collector ring are arranged in the body; the voltage generating component and the body are in clearance fit, the driving component drives the voltage generating component to rotate by blowing out airflow toward the voltage generating component, and the voltage generating component cuts the earth's magnetic field when rotating to generate an electrical signal; the voltage generating component is connected to the collector ring, and the electrical signal is output through the collector ring.

[0007] In one embodiment, the main body includes a first accommodating chamber and a second accommodating chamber; the first accommodating chamber is a rectangular body, and the second accommodating chamber is a column; the columnar end face of the second accommodating chamber is connected to the rectangular end face of the first accommodating chamber in a vertically intersecting manner; and the intersection surface of the first accommodating chamber and the second accommodating chamber is connected.

[0008] In one of the embodiments, the driving component is disposed in a first accommodating chamber, including a gas storage tank, a valve and an air duct; a valve is disposed at the gas outlet of the gas storage tank, the outlet end of the valve is connected to the air duct, and the opening end of the air duct faces the voltage generating component.

[0009] In one of the embodiments, the voltage generating component includes a driving plate, a conductor frame and a rotating rod; the rotating rod is arranged along the central axis of the second receiving chamber, and one end of the rotating rod is gap-matched with the end face of the second receiving chamber away from the intersection face; the other end extends into the first receiving chamber and is gap-matched with the rectangular end face of the first receiving chamber away from the intersection face; the driving plate is located in the first receiving chamber, and the conductor frame is located in the second receiving chamber; the driving plate and the conductor frame are both fixed on the rotating rod, and the position of the driving plate corresponds to the airflow blowing position of the driving component.

[0010] In one of the embodiments, there are two driving plates; the two driving plates are symmetrically arranged on both sides of the rotating rod; and the airflow blown out by the driving assembly acts on the two driving plates alternately.

[0011] In one embodiment, the conductor frame is a rectangular frame, and the rectangular frame is symmetrical about the axis of the rotating rod.

[0012] In one of the embodiments, a slip ring is connected to a side of the conductor frame away from the intersection surface.

[0013] In one embodiment, the collector ring includes a slip ring stator and a slip ring rotor nested in the slip ring stator; the slip ring stator and the slip ring rotor are in rotational sliding cooperation; The slip ring stator is fixed on the end surface of the second accommodation chamber away from the intersection surface, and the rotating rod is fixed in the slip ring rotor; Conductive wires are led out from the slip ring rotor and are respectively connected to the conductor frames on both sides of the rotating rod.

[0014] In one embodiment, the driving components are divided into two groups, which are respectively located on both sides of the voltage generating component; the two driving components face the two driving plates respectively, and act on the two driving plates simultaneously or alternately by blowing out airflow.

[0015] Compared with the prior art, the extremely low frequency non-electric weak signal generator provided by the present invention has the following effects: 1. The entire structure has no external electrical signal input and no electrical drive method, which can reduce the noise impact caused by the circuit at the signal end and improve the authenticity of the signal.

[0016] 2. The principle of generating induced electromotive force by cutting the geomagnetic field through voltage generating components can generate stable microvolt level signals, which can better meet the test requirements of the front-end amplifier of the geomagnetic current meter.

[0017] 3. The present invention has a simple structure, low cost of key components, and good economic value. It is very suitable for small laboratories or experimental environments with high equipment wear, as well as simple qualitative tests on extremely low frequency weak signal amplifiers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 A cross-sectional schematic diagram of an extremely low frequency non-electrical weak signal generator provided by an embodiment; Figure 2 An embodiment is provided Figure 1 An enlarged schematic diagram of the marked portion A; Figure 3 A schematic diagram of the structure of the first containing chamber of an extremely low frequency non-electrical weak signal generator provided in one embodiment; Figure 4 A schematic diagram of a drive assembly structure provided in one embodiment; Figure 5 A vector decomposition diagram of the geomagnetic field intensity provided by an embodiment; Figure 6 A schematic diagram of a conductor performing uniform periodic motion in a magnetic field provided by an embodiment; Figure 7 A schematic diagram of a periodic electric field generated by a conductor's uniform periodic rotational motion provided by an embodiment; Figure 8 A schematic diagram of an application scenario of an extremely low frequency, non-electrical weak signal generator provided by an embodiment.

[0020] Explanation of reference numerals: first accommodating chamber 11 , door 111 , second accommodating chamber 12 , gas storage tank 21 , fixing member 211 , valve 22 , air guide tube 23 , driving plate 31 , first connecting member 313 , conductor frame 32 , rotating rod 33 , collector ring 4 .

[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] It can be understood that the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The following will describe the implementation of the present invention in detail with reference to the accompanying drawings in the embodiment diagram of the present invention.

[0028] This embodiment discloses an extremely low frequency non-electric weak signal generator, which adopts a non-electric input method to replace the traditional signal generator that requires power input. The non-electric drive method can reduce the noise impact caused by the circuit at the signal end and improve the authenticity of the signal. Compared with the traditional signal generator, the present invention uses the principle of generating induced electromotive force by cutting the earth's magnetic field through the voltage generation component, can generate a stable microvolt signal, can work stably under a variety of environmental conditions, and can better meet the test requirements of the front-end amplifier of the geomagnetic current meter. The overall structure is simple, the cost is low, and it has good economic value. It is very suitable for small laboratories or experimental environments with high equipment wear, as well as simple qualitative tests of extremely low frequency weak signal amplifiers.

[0029] like Figures 1 to 4 As shown, the extremely low frequency non-electric weak signal generator provided in this embodiment includes a main body; a driving component, a voltage generating component and a collector ring 4 are arranged in the main body; the voltage generating component and the main body are clearance-matched, the driving component faces the voltage generating component, and drives the voltage generating component to rotate by blowing out airflow, and the voltage generating component cuts the earth's magnetic field when rotating to generate an electrical signal; the voltage generating component is connected to the collector ring 4, and the electrical signal is output through the collector ring.

[0030] Specifically, the body is a cavity structure, mainly including a first receiving chamber 11 and a second receiving chamber 12; the first receiving chamber 11 is a rectangular body, the thickness of which is less than the height or length; the second receiving chamber 12 is a column, which can be a polygonal column or a cylinder. In this embodiment, a cylinder is preferred, and the diameter of the cylinder matches the height of the first receiving chamber 11. The cylindrical end face of the second receiving chamber 12 is connected to the rectangular end face of the first receiving chamber 11 in a perpendicular manner, and the intersection surface of the first receiving chamber 11 and the second receiving chamber 12 is connected. When the first receiving chamber 11 and the second receiving chamber 12 intersect, a body of a "T"-shaped or "L"-shaped structure is formed.

[0031] The driving assembly is arranged in the first receiving chamber 11 and is located on the side away from the intersection surface, and includes a gas storage tank 21, a valve 22 and an air duct 23; a valve 22 is arranged on the gas outlet of the gas storage tank 21, the outlet end of the valve 22 is connected to the air duct 23, and the open end of the air duct 23 faces the voltage generating assembly. A fixing member 211 is also arranged in the first receiving chamber 11, and the gas storage tank 21 is detachably fixed in the first receiving chamber 11 by the fixing member 211. The fixing member 211 can be a block structure with a groove, which is arranged on the inner bottom wall of the first receiving chamber 11, and the size of the groove is adapted to the bottom shape of the gas storage tank 21, and the bottom of the gas storage tank 21 is fixed by placing it in the groove. The fixing member 211 can also be an elastic buckle, and the fixing member 211 is arranged on the side wall of the first receiving chamber 11, and then the outer side wall of the gas storage tank 21 is clamped into the elastic buckle for fixing.

[0032] The gas storage tank 21 is a high-pressure gas cylinder made of steel or aluminum alloy. The gas stored therein is preferably an inert gas, such as nitrogen, helium, etc., preferably nitrogen. Because nitrogen not only has extremely high chemical stability, it is not easy to react with other substances, and will not cause corrosion or chemical reactions to materials. In addition, nitrogen is a clean gas, which is very important for drive systems that need to be kept clean; secondly, nitrogen is the gas with the highest content in the atmosphere. Using nitrogen as a drive gas is easy to obtain, low in cost, and has little impact on the environment; in addition, compared with liquid flow systems, gas flow systems are usually simpler, with lower maintenance and repair costs, which meets the original intention of the present invention to have a simple structure and low price. Valve 22 is mainly used to accurately control the flow rate and power of the gas in the gas storage tank 21.

[0033] The air guide tube 23 is mainly used to bundle and adjust the blowing direction of the airflow so that the airflow acts accurately on the driving plate 31. Furthermore, the airflow preferably acts on the center of the driving plate 31. The air guide tube 23 can be a rigid tube or a flexible tube. When a flexible tube is used, the open end of the air guide tube 23 can be kept facing the driving plate 31 by a positioning clamp or a bracket.

[0034] The drive assembly can be set as one group or two groups. When set as one group, the first accommodation chamber 11 and the second accommodation chamber 12 can intersect to form a "T" shape or an "L" shape, and the drive assembly is set on any side of the "T"-shaped cross arm away from the intersection surface, or on the side of the "L"-shaped cross side away from the intersection surface. When set as two groups, the first accommodation chamber 11 and the second accommodation chamber 12 preferably intersect to form a "T" shape, and the drive assemblies are respectively located on both sides of the "T"-shaped cross arm.

[0035] A door 111 is also provided on the side of the first receiving chamber 11, and the door 111 is provided near the driving assembly, so as to open the first receiving chamber 11 at any time, replace the gas storage tank 21 or adjust the flow rate of the gas storage tank 21. When two sets of driving assemblies are provided, there are also two doors 111, which are provided on two sides respectively.

[0036] The voltage generating assembly includes a driving plate 31, a conductor frame 32 and a rotating rod 33; wherein the rotating rod 33 is a straight rod, arranged along the central axis of the second accommodating chamber 12, one end of which is matched with the end face gap of the second accommodating chamber 12 away from the intersection face; the other end extends into the first accommodating chamber 11, and is matched with the rectangular end face gap of the first accommodating chamber 11 away from the intersection face; the driving plate 31 is located in the first accommodating chamber 11, the conductor frame 32 is located in the second accommodating chamber, and the driving plate 31 and the conductor frame 32 are in the same plane; the driving plate 31 and the conductor frame 32 are both fixed on the rotating rod 33, and the plate surface of the driving plate 31 corresponds to the airflow blowing position of the driving assembly.

[0037] The driving plate 31 is a plate-like structure, and its shape can be rectangular, polygonal, circular, elliptical, etc. It is preferably a symmetrical structure with the center of gravity centered to maintain stability during rotation. The driving plates 31 are generally provided in two, and the two driving plates 31 are symmetrically connected to the two sides of the rotating rod 33 through the first connecting member 313. When the driving assembly is a group, the open end of the air duct 23 corresponds to the position of the driving plate 31 located above, and the airflow blown out of the air duct 23 acts alternately on the two driving plates 31; when the driving assembly is two groups, the open ends of the air ducts 23 in the two groups of driving assemblies correspond to the positions of the two driving plates 31 respectively, and the blowing directions are opposite, and the airflow can be blown out in a manner that acts on the two driving plates 31 simultaneously or alternately.

[0038] It can be understood that the balanced stability of the rotation can be maintained by the two symmetrically arranged drive plates 31. At the same time, the two drive plates 31 are subjected to force alternately or simultaneously, which can form continuous rotation, avoiding the intermittent movement of a single drive plate 31 caused by unidirectional impact. When designing the drive plate 31, its weight, strength and cost-effectiveness should be considered. It is preferred to prepare the drive plate 31 with an aluminum alloy material. Aluminum alloy has a low density, a good strength-to-weight ratio, is easy to process and has a low cost. It can also be subjected to a variety of surface treatments to improve oxidation resistance and aesthetics. These characteristics make it an ideal material for preparing the drive plate 31. Furthermore, in order to improve the energy conversion efficiency, the area of ​​the drive plate 31 must be large enough. On the basis of expanding the plate area, its weight must also be considered comprehensively. Therefore, in this embodiment, the plate area is set to 25cm 2 , thickness is set to 2mm.

[0039] The conductor frame 32 is a rectangular frame surrounded by metal or alloy profiles, and its cross section can be rectangular, polygonal, circular, or quasi-circular, etc., and can also be solid or hollow, depending on the specific requirements. The conductor frame 32 is fixed with the rotating rod 33 as the axis of symmetry. This axisymmetric setting, on the one hand, can generate two sinusoidal signals of equal magnitude and opposite phases during the rotation of the rectangular frame around the rotating rod 33, which can be superimposed to generate a larger signal; on the other hand, the symmetrical shape helps to maintain the balance of the conductor frame 32 during rotation, reducing safety hazards and possible errors. The axisymmetric design helps to evenly distribute mechanical stress and improve the durability and reliability of the equipment. In terms of material, the present embodiment preferably uses copper to prepare the conductor frame 32. The electrical conductivity of copper is second only to silver and is much higher than other metals. As a mixed material, it is not easily corroded in dry air, and an oxide layer will be generated in a humid environment to prevent further corrosion. Copper is easy to weld, which can facilitate the preparation process. Copper also has good mechanical strength and can withstand relative physical stress during rotation as the conductor frame 32. Finally, copper is a non-magnetic material and will not be affected by the magnetic field and will not generate a magnetic field.

[0040] The rotating rod 33 is a straight rod with a certain rigidity. The cross section can be rectangular, polygonal, circular or quasi-circular, etc. It can also be solid or hollow, depending on the specific needs. It mainly serves as an intermediate component to convert the driving force of the airflow to the driving plate 31 into a rotational force to drive the conductor frame 32 to rotate and cut the geomagnetic field. The rotating rod 33 is arranged along the central axis of the second receiving chamber 12, and the two ends are respectively matched with the rectangular end face of the first receiving chamber 11 away from the intersection face and the end face of the second receiving chamber 12 away from the intersection face. The clearance fit can be realized by means of a sliding bearing or a rolling bearing. For example, a sliding bearing or a rolling bearing is arranged on the rectangular end face of the first accommodation chamber 11 away from the intersection face, and one end of the rotating rod 33 is inserted into the inner ring of the bearing to form a rotatable clearance fit; and a collector ring 4 is arranged on the end face of the second accommodation chamber 12 away from the intersection face, and the collector ring 4 includes a slip ring stator and a slip ring rotor nested in the slip ring stator, and the slip ring stator and the slip ring rotor can rotate and slide relative to each other; the slip ring stator is fixed on the end face of the second accommodation chamber 12 away from the intersection face, and the other end of the rotating rod 33 is inserted into the slip ring rotor, thereby forming a rotatable clearance fit. A wire is led out from the slip ring rotor, and the wire is respectively wound or welded on the conductor frame 32 on both sides of the rotating rod 33. Through such a connection method, when the conductor frame 32 rotates, its two sides can cut the magnetic field to generate an electrical signal, thereby obtaining a double electrical signal, which is then output to an external device through the wire on the slip ring stator. It is worth noting that the conductor frame 32 is in a connected state at the rotating rod 33, and the connecting part uses a material with a higher resistivity than copper, such as nickel-chromium alloy or manganese-copper alloy, so as to form a large voltage difference at both ends, and then measure the voltage generated by the conductor frame 32 cutting the magnetic field.

[0041] In the selection of the model of the collector ring 4, reducing noise is the key point. The present invention selects a brushless slip ring as a device for transmitting signals between the rotating part and the stationary part. Compared with traditional brushes, the brushless slip ring has the advantages of no wear, low electromagnetic interference, precise control, and high data transmission rate.

[0042] In one of the embodiments, the principle of the extremely low frequency non-electrical weak signal generator proposed by the present invention is explained.

[0043] It is known that the magnetic field strength at a certain location is Then, in a shorter spatial range, the geomagnetic field lines can be regarded as being on a plane. Then, by multiplying the plane with the magnetic declination coefficient, we can obtain the geomagnetic field plane perpendicular to the horizontal plane. Let its magnetic field strength be , so the geomagnetic lines can be split into horizontal and vertical directions on this plane, with sizes of and ,like Figure 5 As shown. At this time, a long straight wire is placed in an environment with less interference, so that it is only cut by the earth's magnetic field when it moves. Suppose its length is The straight wire is designed as a semi-frame structure that bulges upward, and the long straight wire is made to move around an axis parallel to it at a speed of The uniform periodic motion of Figure 6 When the straight wire is on the plane and parallel to the horizontal direction, it is only cut by the vertical magnetic field, so the induced electromotive force at this point is At this time, the effective voltage generated by cutting the magnetic flux lines is Similarly, when the straight wire is perpendicular to the plane, it is cut by two components at the same time, that is, it is cut by the magnetic field at that location. At this time, the induced electromotive force at that location is ; The effective voltage generated is ,like Figure 7 As shown. Take a certain place as an example, the latitude is 17.9°N and the longitude is 116.1°E. The magnetic field strength is about 43.1μT, of which the horizontal magnetic field is about 39.1μT and the vertical magnetic field is about 18.1μT. If the length of the long straight wire is 0.5m, and it moves around the axis at a speed of 1m / s to cut the horizontal magnetic field and the vertical magnetic field in a uniform periodic motion, the induced electromotive force generated should be 19.6μV and 9.1μV respectively. It is worth noting that the cutting length and cutting speed will change the generated voltage. Therefore, the cutting radius and cutting length can be designed to be shorter to reduce the size of the signal generated, even to the nanovolt level.

[0044] In addition, Figure 6 The semi-frame structure is half of the conductor frame 32 and is made of T2 copper. The diameter of the T2 copper tube is 4 mm, the rotation radius is 0.5 m, the cutting edge length is 1 m, and the total length is 2 m. Its volume is: ; For this copper tube, its mass is: ; According to the angular velocity formula, let 16Hz, then: ; For a single rotating edge, its moment of inertia is: ; For the cutting edge, its moment of inertia is: ; Assume that the acceleration starts from rest The time taken is t , then the angular acceleration is: ; The torque can be calculated using the following formula: ； make t =2s, substitute The expression of , we can get: ; By applying a force To generate torque, then: ； Substitution have to: ; In order to keep the wire frame balanced during rotation, it should be designed to be cut on both sides, that is, the shape of the conductor frame 32 provided by the present invention. In this case, the required force is 8.48N.

[0045] Considering the energy conversion efficiency and the weight of the collector ring 4 and the drive plate 31, the thrust required during the acceleration process is at least 100N. The required thrust for the drive plate is: ; For standard nitrogen cylinders, the filling pressure is generally above 1MPa, which is much greater than the 40,000Pa required for the experiment. Therefore, the nitrogen cylinder can push the system to 16Hz and maintain its rotation speed for a period of time, which is sufficient to complete relevant experiments and tests.

[0046] It is worth noting that, in actual use, the size of the airflow spray can be adjusted, and the size of the driving plate 31, the first connecting member 313, and the conductor frame 32 can be changed to change the generated induced electromotive force.

[0047] When working, first start the generator and connect a larger magnetic field to the outside. The gas tank 21 outputs a larger airflow to act on the driving plate 31 to form a driving force. The driving force is transmitted to the rotating rod 33 through the first connecting member 313. Since the rotating rod 33 and the two end surfaces are in clearance fit, the conductor frame 32 is driven to rotate faster. When the external oscilloscope determines that the conductor frame 32 outputs an electrical signal of 16Hz, the airflow output of the gas tank 21 is adjusted and reduced through the valve 22 so that the conductor frame 32 maintains a rotation frequency of 16Hz. At this time, the external magnetic field is stopped, and the conductor frame 32 cuts the earth's magnetic field at 16Hz, outputting a 16Hz AC signal of about 20uV. The collector ring 4 collects the generated AC signal and transmits it to the external device through the wire.

[0048] In one embodiment, if Figure 8As shown, a schematic diagram of the application scenario of an extremely low frequency non-electric weak signal generator is provided, including a signal generator, a front-end signal amplifier, a host computer and an oscilloscope. Among them, the signal generator is the extremely low frequency non-electric weak signal generator provided in this embodiment, and the end of the collector ring has a fixed signal output interface; the front-end signal amplifier is the device to be tested. Before starting the device, the output end of the collector ring is connected to the input end of the host computer and the oscilloscope respectively. The front end of the signal generator is detachable and used to replace the nitrogen bottle; when in use, the weak signal output by the signal generator can be input into the host computer and the oscilloscope after simple amplification, and signal processing and signal visualization operations are performed respectively to verify whether the preparation of the front-end amplifier of the geomagnetic current meter is successful.

[0049] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An extremely low frequency non-electric weak signal generator, characterized in that: include: ontology; A driving component, a voltage generating component and a collector ring are arranged in the body; The voltage generating component and the body are in clearance fit, the driving component faces the voltage generating component and drives the voltage generating component to rotate by blowing out airflow, and the voltage generating component cuts the earth's magnetic field when rotating to generate an electrical signal; The voltage generating component is connected to the slip ring and outputs the electrical signal through the slip ring.

2. The extremely low frequency non-electric weak signal generator according to claim 1, characterized in that: The body includes a first receiving chamber and a second receiving chamber; The first storage chamber is a rectangular body, and the second storage chamber is a column; the column end face of the second storage chamber is connected to the rectangular end face of the first storage chamber in a perpendicular intersection manner; and the intersection surface of the first storage chamber and the second storage chamber is connected.

3. The extremely low frequency non-electric weak signal generator according to claim 2, characterized in that: The driving assembly is arranged in the first accommodation chamber, and includes a gas storage tank, a valve and an air guide pipe; A valve is arranged at the gas outlet of the gas storage tank, the outlet end of the valve is connected to an air guide pipe, and the opening end of the air guide pipe faces the voltage generating component.

4. The extremely low frequency non-electric weak signal generator according to claim 2, characterized in that: The voltage generating assembly includes a driving plate, a conductor frame and a rotating rod; The rotating rod is arranged along the central axis of the second accommodation chamber, one end of which is in clearance with the end surface of the second accommodation chamber away from the intersection surface; the other end extends into the first accommodation chamber and is in clearance with the rectangular end surface of the first accommodation chamber away from the intersection surface; The driving board is located in the first accommodation chamber, the conductor frame is located in the second accommodation chamber, and the driving board and the conductor frame are in the same plane; The driving plate and the conductor frame are both fixed on the rotating rod, and the position of the driving plate corresponds to the airflow blowing position of the driving component.

5. The extremely low frequency non-electric weak signal generator according to claim 4, characterized in that: There are two driving plates; the two driving plates are symmetrically arranged on both sides of the rotating rod; and the airflow blown out by the driving component acts on the two driving plates alternately.

6. The extremely low frequency non-electric weak signal generator according to claim 4 or 5, characterized in that: The conductor frame is a rectangular frame, and the rectangular frame is symmetrical about the axis of the rotating rod.

7. The extremely low frequency non-electric weak signal generator according to claim 6, characterized in that: A collector ring is connected to a side of the conductor frame away from the intersection surface.

8. The extremely low frequency non-electric weak signal generator according to claim 7, characterized in that: The collector ring includes a slip ring stator and a slip ring rotor nested in the slip ring stator; the slip ring stator and the slip ring rotor are in rotational sliding cooperation; The slip ring stator is fixed on the end surface of the second accommodation chamber away from the intersection surface, and the rotating rod is fixed in the slip ring rotor; Conductive wires are led out from the slip ring rotor and are respectively connected to the conductor frames on both sides of the rotating rod.

9. The extremely low frequency non-electric weak signal generator according to claim 5, characterized in that: The driving components are divided into two groups, which are respectively located on both sides of the voltage generating component; The two driving components face the two driving plates respectively, and act on the two driving plates simultaneously or alternately by blowing out airflow.

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