Extremely-low-frequency power-free weak signal generator

Abstract

The utility model 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. The structure provided by the utility model has no input of external electric signals, can reduce the noise influence caused by a circuit at a signal end, and improves the authenticity of signals. 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 utility model relates to ocean current velocity test technical field especially relates to a very low frequency no electricity weak signal generator. BACKGROUND

[0002] The area of ocean accounts for about 71% of global surface area, and contains rich biological resources, chemical resources, mineral resources and power resources. The development and utilization of ocean resources greatly promote the economic development. Therefore, grasping the characteristics of ocean geographical environment, preparing for navigation and resource exploration, understanding and mastering the motion law of ocean become one of the important conditions for the current development of ocean. Precise current data can directly serve scientific research, fishery, marine transportation and marine disaster warning fields.

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

[0004] However, the current market weak signal generator is mainly used in electrocardiogram, electroencephalogram measurement and other fields, and is not specially designed for current velocity measurement. Due to the existence of external power supply, there is a lot of circuit noise, which will greatly affect the test of the amplification circuit. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to provide a very low frequency no electricity weak signal generator which does not need external power supply and reduces the noise influence caused by external circuit.

[0006] An extremely low frequency no-electricity weak signal generator, comprising: a body; a driving assembly, a voltage generating assembly and a current collecting ring arranged in the body; the voltage generating assembly is gap-fitted with the body, the driving assembly is towards the voltage generating assembly, the voltage generating assembly is driven to rotate by blowing air flow, the voltage generating assembly cuts the geomagnetic field when rotating to generate an electric signal; the voltage generating assembly is connected with the current collecting ring, and the electric signal is output through the current collecting ring.

[0007] In one embodiment, the body comprises 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 body; the column body end face of the second accommodating chamber is connected to the rectangular end face of the first accommodating chamber in a perpendicular intersecting manner; and the intersecting surface of the first accommodating chamber and the second accommodating chamber is communicated.

[0008] In one embodiment, the driving assembly is arranged in the first accommodating chamber and comprises a gas storage tank, a valve and a gas guide pipe; the valve is arranged at the gas outlet of the gas storage tank, the outlet end of the valve is connected with the gas guide pipe, and the opening end of the gas guide pipe is towards the voltage generating assembly.

[0009] In one embodiment, the voltage generating assembly comprises a driving plate, a conductor frame and a rotating rod; the rotating rod is arranged along the central axis of the second accommodating chamber, one end of the rotating rod is gap-fitted with the end face of the second accommodating chamber away from the intersecting surface, and the other end of the rotating rod extends into the first accommodating chamber and is gap-fitted with the rectangular end face of the first accommodating chamber away from the intersecting surface; the driving plate is located in the first accommodating chamber, and the conductor frame is located in the second accommodating 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 air flow blowing position of the driving assembly.

[0010] In one embodiment, the driving plate is two; the two driving plates are symmetrically arranged on both sides of the rotating rod; the air flow blown 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 axisymmetric based on the rotating rod.

[0012] In one embodiment, a current collecting ring is connected to the side of the conductor frame away from the intersecting surface.

[0013] In one embodiment, the current collecting ring comprises 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 rotationally and slidingly fitted;

[0014] The slip ring stator is fixed on the end face of the second accommodating chamber away from the intersecting surface, and the rotating rod is fixed in the slip ring rotor.

[0015] The conductive wires are drawn out on the slip ring rotor and are connected to the conductor frames on both sides of the rotating rod respectively.

[0016] In one embodiment, the driving assembly is two groups, respectively on both sides of the voltage generating assembly; two driving assemblies are respectively towards two driving plates, and simultaneously or alternately act on the two driving plates by blowing air flow.

[0017] Compared with the prior art, the extremely low frequency non-electric weak signal generator has the following effects:

[0018] 1. The whole structure has no external signal input, and the non-electric driving method can reduce the noise influence of the signal end caused by the circuit and improve the authenticity of the signal.

[0019] 2. By the principle of cutting the geomagnetic field to generate induced electromotive force, stable microvolt-level signals can be generated, which can better meet the test requirements of the front-end amplifier of the geomagnetic ocean current meter.

[0020] 3. The utility model has the advantages of simple structure, low cost of key components, good economic value, and is very suitable for small laboratories or experimental environments with high equipment wear, and simple qualitative testing of extremely low frequency weak signal amplifiers. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in these drawings without creating creative labor.

[0022] Figure 1 The cross-sectional schematic view of the extremely low frequency non-electric weak signal generator provided for one embodiment is shown in the figure.

[0023] Figure 2 The cross-sectional schematic view of the extremely low frequency non-electric weak signal generator provided for one embodiment is shown in the figure. Figure 1 The enlarged schematic view of the identification part A is shown in the figure.

[0024] Figure 3 The first accommodating chamber structure schematic view of the extremely low frequency non-electric weak signal generator provided for one embodiment is shown in the figure.

[0025] Figure 4 The driving assembly structure schematic view provided for one embodiment is shown in the figure.

[0026] Figure 5 The geomagnetic field intensity vector decomposition diagram provided for one embodiment is shown in the figure.

[0027] Figure 6 A schematic diagram of a conductor moving at a constant speed in a magnetic field is provided for one embodiment;

[0028] Figure 7 A schematic diagram of a periodic electric field generated by a conductor moving at a constant speed in a magnetic field is provided for one embodiment;

[0029] Figure 8 A schematic diagram of an application scenario of an extremely low frequency electrically weak signal generator is provided for one embodiment.

[0030] The reference signs are explained as follows: a first accommodating chamber 11, a door 111, a second accommodating chamber 12, a gas storage tank 21, a fixing member 211, a valve 22, a gas guide pipe 23, a driving plate 31, a first connecting member 313, a conductor frame 32, a rotating rod 33, and a current collector ring 4.

[0031] The purposes, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0034] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0035] In the utility model, unless another definite provision and limitation, the terms "connect", "fix" and the like should be understood broadly, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection, can also be physical connection or wireless communication connection;Can be direct connection, also can be indirectly connected through intermediate medium, can be the communication or mutual action relation of two elements inside, unless another definite limitation. For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0036] It can be understood that the technical solutions of various embodiments of the utility model can be combined with each other, but it must be based on that ordinary skilled person in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0037] The embodiment of the utility model will be described in detail below with the drawings in the embodiment of the utility model.

[0038] The embodiment discloses an extremely low frequency no electricity weak signal generator, adopts no electricity input mode to replace traditional signal generator needing power input, no electricity driven method can reduce the noise influence of circuit at signal end, improves the authenticity of signal. Compared with traditional signal generator, the utility model can produce stable microvolt level signal through the principle that voltage generation component cuts geomagnetic field and produces induced electromotive force, can stably work under various environmental conditions, can better satisfy the test requirements of geomagnetic current meter front end amplifier. The overall structure is simple, low in cost, has good economic value, is very suitable for small laboratory or experimental environment with higher equipment wear, and simple qualitative test of extremely low frequency weak signal amplifier.

[0039] As shown in Figures 1 to 4 The extremely low frequency no electricity weak signal generator provided by the embodiment includes a body;Driving assembly, voltage generation component and current collector ring 4 are arranged in the body;Voltage generation component is gap fitted with the body, driving assembly is towards voltage generation component, and voltage generation component is driven to rotate by blowing air flow, and voltage generation component cuts geomagnetic field when rotating and generates electric signal;Voltage generation component is connected with current collector ring 4, and electric signal is output through current collector ring.

[0040] Specifically, the body is a hollow structure, mainly comprising a first accommodating chamber 11 and a second accommodating chamber 12; the first accommodating chamber 11 is a rectangular body, the thickness of the rectangular body is less than the height or length; the second accommodating chamber 12 is a column body, which can be a polygonal column body or a cylindrical body, and the cylindrical body is preferred in the embodiment, and the diameter of the cylindrical body is adapted to the height of the first accommodating chamber 11. The end face of the column body of the second accommodating chamber 12 is connected to the end face of the rectangular body of the first accommodating chamber 11 in a perpendicular intersecting manner, and the intersecting surface of the first accommodating chamber 11 and the second accommodating chamber 12 is communicated. When the first accommodating chamber 11 and the second accommodating chamber 12 intersect, the body forms a "T" shaped or "L" shaped structure.

[0041] The driving assembly is arranged in the first accommodating chamber 11 and located at a side away from the intersecting surface, comprising a gas storage tank 21, a valve 22 and a gas guide pipe 23; the 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 gas guide pipe 23, and the opening end of the gas guide pipe 23 faces the voltage generating assembly. In the first accommodating chamber 11, a fixing member 211 is further arranged, and the gas storage tank 21 is detachably fixed in the first accommodating chamber 11 through 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 accommodating chamber 11, and the size of the groove is adapted to the shape of the bottom of the gas storage tank 21, and the gas storage tank 21 is fixed by being placed in the groove. The fixing member 211 can also be an elastic buckle, which is arranged on the side wall of the first accommodating chamber 11, and then the outer side wall of the gas storage tank 21 is clamped into the elastic buckle for fixation.

[0042] The gas storage tank 21 is a high-pressure gas cylinder made of steel or aluminum alloy, and the gas stored therein is preferably inert gas, such as nitrogen, helium, etc., preferably nitrogen. Because nitrogen has extremely high chemical stability, it is not easy to react with other substances, and it will not cause corrosion or chemical reaction to the material, and nitrogen is a clean gas, which is very important for the drive system which needs to be kept clean; secondly, nitrogen is the gas with the highest content in the atmosphere, and the use of nitrogen as a driving gas is easy to obtain, low in cost and less harmful to the environment; in addition, compared with the liquid flow system, the gas flow system is generally simple, and the maintenance and repair cost is low, which meets the original intention of the utility model that the structure is simple and the price is low. The valve 22 is mainly used for accurately controlling the flow rate and power of the gas in the gas storage tank 21.

[0043] The gas guide pipe 23 is mainly used for bundling and adjusting the blowing direction of the gas flow, so that the gas flow accurately acts on the driving plate 31, and further, the gas flow is preferably applied to the center of the driving plate 31. The gas guide pipe 23 can be a rigid pipe or a flexible pipe, and when a flexible pipe is used, the opening end of the gas guide pipe 23 can be kept facing the driving plate 31 by positioning clamping seats or supports, etc.

[0044] The driving assembly can be arranged in one or two groups. When arranged in one group, the first accommodating chamber 11 and the second accommodating chamber 12 can intersect to form a "T" shape or an "L" shape, and the driving assembly is arranged on the horizontal arm of the "T" shape or the horizontal side of the "L" shape away from the intersection surface according to the situation. When arranged in two groups, the first accommodating chamber 11 and the second accommodating chamber 12 preferably intersect to form a "T" shape, and the driving assemblies are arranged on the two sides of the horizontal arm of the "T" shape, respectively.

[0045] A door 111 is further arranged on the side of the first accommodating chamber 11, which is arranged near the driving assembly to facilitate opening the first accommodating chamber 11 at any time, replacing the gas storage tank 21 or adjusting the flow rate of the gas storage tank 21. When two groups of driving assemblies are arranged, two doors 111 are arranged on the two sides, respectively.

[0046] The voltage generating assembly comprises a driving plate 31, a conductor frame 32 and a rotating rod 33. The rotating rod 33 is a straight rod arranged along the central axis of the second accommodating chamber 12, one end of which is in gap cooperation with the end surface of the second accommodating chamber 12 away from the intersection surface, and the other end extends into the first accommodating chamber 11 and is in gap cooperation with the rectangular end surface of the first accommodating chamber 11 away from the intersection surface. The driving plate 31 is arranged in the first accommodating chamber 11, and the conductor frame 32 is arranged in the second accommodating chamber 12. 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 position where the gas flow of the driving assembly blows out.

[0047] The driving plate 31 is in a plate shape, which can be rectangular, polygonal, circular, oval or the like. Preferably, the structure is symmetrical and the center of gravity is in the middle to maintain stability during rotation. Generally, two driving plates 31 are arranged and symmetrically connected to the two sides of the rotating rod 33 through a first connecting piece 313. When the driving assembly is one group, the opening end of the gas guide pipe 23 corresponds to the position of the driving plate 31 arranged above, and the gas flow blown out by the gas guide pipe 23 acts on the two driving plates 31 alternately. When the driving assembly is two groups, the opening ends of the gas guide pipes 23 in the two groups of driving assemblies correspond to the positions of the two driving plates 31, respectively, and the directions of the blown gas are opposite. The blown gas flow can act on the two driving plates 31 simultaneously or alternately.

[0048] It can be understood that through the symmetrical arrangement of two driving plates 31, the balance stability of rotation can be maintained, and at the same time, the two driving plates 31 are alternately or simultaneously stressed, so that continuous rotation can be formed, and intermittent movement caused by one-way impact of a single driving plate 31 is avoided. When designing the driving plate 31, its weight, strength and cost-effectiveness should be considered. Preferably, the driving plate 31 is made of aluminum alloy. Aluminum alloy has low density, good strength-to-weight ratio, is easy to process and has low cost. In addition, various treatments can be performed on the surface to improve oxidation resistance and aesthetics, etc. These characteristics make it an ideal material for preparing the driving plate 31. Further, in order to improve the energy conversion efficiency, the area of the driving plate 31 should be large enough. On the basis of expanding the plate area, its weight also needs to be considered comprehensively, therefore, in the embodiment, the plate area is set to 25cm 2 , and the thickness is set to 2mm.

[0049] The conductor frame 32 is a rectangular frame surrounded by a metal or alloy profile. Its cross section can be rectangular, polygonal, circular or circular-like, and can also be solid or hollow, which is set according to the needs. The conductor frame 32 is fixed with the rotating rod 33 as the axis of symmetry. This axisymmetric arrangement, on the one hand, the rectangular frame can generate two equal-sized and opposite-phase sinusoidal signals during rotation 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, reduces the security risks while reducing the possible errors, and the axisymmetric design helps to uniformly distribute mechanical stress, improves the durability and reliability of the equipment. In terms of material, the conductor frame 32 in the embodiment is preferably made of red copper. The electrical conductivity of red copper is second only to silver and much higher than other metals; as a mixed material, it is not easy to be corroded in dry air, and in a humid environment, it will also form an oxidation layer to prevent further corrosion; red copper is easy to weld, which can provide convenience for the preparation process; red copper also has good mechanical strength, which can withstand relative physical stress during rotation as a conductor frame 32; finally, red copper is a non-magnetic material, which will not be affected by the magnetic field and will not generate a magnetic field.

[0050] The rotating rod 33 is a straight rod with certain rigidity, and the cross section can be rectangular, polygonal, circular or circular-like, and can also be solid or hollow, which is set according to the requirements. It mainly serves as an intermediate part to convert the pushing force of the air flow to the driving plate 31 into a rotating 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 containing chamber 12, and the two ends are respectively matched with the rectangular end face of the first containing chamber 11 away from the intersection surface and the end face of the second containing chamber 12 away from the intersection surface. The gap fit can be realized in the form of sliding bearing or rolling bearing, such as setting a sliding bearing or a rolling bearing on the rectangular end face of the first containing chamber 11 away from the intersection surface, and inserting one end of the rotating rod 33 into the inner ring of the bearing to form a rotatable gap fit. The current collector ring 4 is arranged on the end face of the second containing chamber 12 away from the intersection surface, and the current 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 containing chamber 12 away from the intersection surface, and the other end of the rotating rod 33 is inserted into the slip ring rotor, thereby forming a rotatable gap fit. The wire is led out on the slip ring rotor and wound or welded on the conductor frame 32 on both sides of the rotating rod 33. Through such a connection mode, when the conductor frame 32 rotates, both sides can cut the magnetic field to generate an electric signal, thereby obtaining double electric signals, which are then output to external equipment through the wire on the slip ring stator. It is worth noting that the conductor frame 32 is in communication at the rotating rod 33, and the communication part is made of a material with higher electrical resistivity than red copper, such as nickel-chromium alloy or manganese-copper alloy, so as to form a larger voltage difference at both ends, thereby measuring the voltage generated by the conductor frame 32 cutting the magnetic field.

[0051] In the selection of the model of the current collector ring 4, the reduction of noise is the key. The utility model chooses the brushless slip ring as the device for transmitting signals between the rotating part and the stationary part, which has the advantages of no wear, low electromagnetic interference, accurate control, high data transmission rate and the like compared with the traditional brush.

[0052] In one embodiment, the principle of the extremely low frequency and weak signal generator without electricity is described.

[0053] It is known that the geomagnetic field intensity at a certain place is . In a short spatial range, the geomagnetic field lines can be regarded as being on a plane. Multiply the plane by the magnetic declination coefficient to obtain a geomagnetic field plane perpendicular to the horizontal plane, and let the magnetic field intensity be . Therefore, the geomagnetic lines on the plane can be divided into horizontal and vertical directions, and the sizes are and , as shown in Figure 5 . At this time, a long straight wire is placed in an environment with less interference, so that it is only cut by the geomagnetic field when it moves. Let the length be The straight wire is designed as a half-frame structure that protrudes upward, and the long straight wire is subjected to a uniform periodic motion with a speed of Figure 6 When the straight wire is parallel to the horizontal direction on the plane, it is only cut by the vertical magnetic field, and the induced electromotive force at this position is The effective voltage generated by cutting the magnetic field lines is Similarly, when the straight wire is perpendicular to the plane, it is cut by both components, i.e., it is cut by the magnetic field at this position, and the induced electromotive force at this position is The effective voltage generated is as shown in Figure 7 For example, the latitude of a certain location is 17.9°N, and the longitude is 116.1°E. The magnetic field strength is approximately 43.1 μT, of which the horizontal magnetic field is approximately 39.1 μT, and the vertical magnetic field is approximately 18.1 μT. If the length of the long straight wire is 0.5 m and it is subjected to a uniform periodic motion with a speed of 1 m / s around the axis cutting the horizontal magnetic field and the vertical magnetic field, the induced electromotive forces should be 19.6 μV and 9.1 μV, respectively. It is worth noting that the cutting length and cutting speed will change the generated voltage, so the cutting radius and cutting length can be designed to be shorter to reduce the size of the generated signal, even to the nanovolt level.

[0054] In addition, a model is calculated as Figure 6 The half-frame structure is half of the conductor frame 32, made of T2 red copper. The T2 red copper pipe has a diameter of 4 mm, a rotating radius of 0.5 m, a cutting edge length of 1 m, and a total length of 2 m, with a volume of

[0055] ;

[0056] The mass of the copper pipe is

[0057] ;

[0058] From the angular velocity formula, let 16 Hz, then

[0059] ;

[0060] The moment of inertia of a single rotating edge is

[0061] ;

[0062] The moment of inertia of the cutting edge is

[0063] ; ​

[0064] Assume that the acceleration starts from rest The time used is t The angular acceleration is:

[0065] ;

[0066] The torque can be calculated by the following formula:

[0067] ；

[0068] Let t = 2s, substitute the expression of , and the following can be obtained:

[0069] ;

[0070] By applying a force to generate torque, then:

[0071] ；

[0072] Substitute , and the following can be obtained:

[0073] ;

[0074] In order to keep the wire frame balanced in rotation, it should be designed as double-sided cutting, that is, the conductor frame 32 shape provided by the utility model, at this time the required force is 8.48N.

[0075] Considering the energy conversion efficiency and the weight of the current collector ring 4 and the driving plate 31, the required thrust during acceleration is at least 100N. For this thrust, for a 25 mm driving plate, the required thrust is:

[0076] ;

[0077] And for a standard nitrogen cylinder, it generally has a filling pressure of more than 1MPa, which is much larger than the required 40000Pa of the experiment, so the nitrogen cylinder can meet the requirements of pushing the system to 16Hz and maintaining its rotation speed for a period of time, which is enough to complete the related experiments and tests.

[0078] It is worth noting that in actual use, the size of the gas flow can be adjusted, and the size of the driving plate 31, the first connecting piece 313 and the conductor frame 32 can be adjusted to change the induced electromotive force generated.

[0079] In work, first, the generator is started and a large magnetic field is connected, a large gas flow output by the gas tank 21 acts on the driving plate 31 to form a pushing force. The pushing force is transmitted to the rotating rod 33 through the first connecting piece 313, and the rotating rod 33 is in gap fit with the two end faces, so as to drive the conductor frame 32 to rotate at high speed. When the oscilloscope connected outside determines that the conductor frame 32 outputs a 16Hz electrical signal, the valve 22 is adjusted to reduce the gas flow output of the gas tank 21, so that the conductor frame 32 maintains a rotation frequency of 16Hz. At this time, stop connecting the magnetic field, the conductor frame 32 cuts the geomagnetic field at 16Hz, and outputs a 16Hz alternating signal of about 20uV. The slip ring 4 collects the generated alternating signal and transmits it to the external device through the wire.

[0080] In one embodiment, as shown in Figure 8 The application scene schematic diagram of the extremely low frequency and electricity-free weak signal generator is provided, including a signal generator, a front-end signal amplifier, a host computer and an oscilloscope. The signal generator is the extremely low frequency and electricity-free weak signal generator provided by the embodiment, and the end of the slip ring has a fixed signal output interface. The front-end signal amplifier is a device to be tested. Before starting the device, the output end of the slip 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 is used to replace the nitrogen cylinder. 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 respectively performed, so as to verify whether the preparation of the front-end amplifier of the geomagnetic current meter is successful.

[0081] The technical features of the above embodiments can be combined in any way. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

[0082] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the appended claims.

Claims

1. An ultra-low frequency, power-free weak signal generator, characterized in that, include: ontology; Within the main body, a driving component, a voltage generating component, and a collector ring are provided; The voltage generating component is clearance-fitted with the body. The driving component faces the voltage generating component and drives the voltage generating component to rotate by blowing out air. When the voltage generating component rotates, it cuts the geomagnetic field and generates an electrical signal. The voltage generation component is connected to the collector ring, and the electrical signal is output through the collector ring.

2. The ultra-low frequency, power-free weak signal generator according to claim 1, characterized in that, 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 perpendicular manner; and the intersecting surfaces of the first accommodating chamber and the second accommodating chamber are connected.

3. The ultra-low frequency, power-free weak signal generator according to claim 2, characterized in that, The drive assembly is located in the first receiving chamber and includes an air tank, a valve, and an air guide pipe; A valve is installed at the outlet of the gas storage tank, and the outlet end of the valve is connected to a gas guide pipe, with the open end of the gas guide pipe facing the voltage generating component.

4. The ultra-low frequency, power-free weak signal generator according to claim 2, characterized in that, The voltage generation component includes a drive board, a conductor frame, and a rotating rod; The rotating rod is arranged along the central axis of the second receiving chamber, with one end of it in clearance fit with the end face of the second receiving chamber away from the intersecting surface; the other end extends into the first receiving chamber and is in clearance fit with the rectangular end face of the first receiving chamber away from the intersecting surface. The drive board is located in the first receiving chamber, the conductor frame is located in the second receiving chamber, and the drive board and the conductor frame are on the same plane; Both the drive plate and the conductor frame are fixed on the rotating rod, and the position of the drive plate corresponds to the airflow outlet position of the drive assembly.

5. The ultra-low frequency, power-free weak signal generator according to claim 4, characterized in that, There are two drive plates; the two drive plates are symmetrically arranged on both sides of the rotating rod; the airflow blown out by the drive assembly acts alternately on the two drive plates.

6. The ultra-low frequency, power-free 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 ultra-low frequency, power-free weak signal generator according to claim 6, characterized in that, A collector ring is connected to the side of the conductor frame away from the intersecting surface.

8. The ultra-low frequency, power-free weak signal generator according to claim 7, characterized in that, The slip 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 a rotary sliding fit. The slip ring stator is fixed on the end face of the second receiving chamber away from the intersecting surface, and the rotating rod is fixed in the slip ring rotor; 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 ultra-low frequency, power-free weak signal generator according to claim 5, characterized in that, The driving components are in two sets, located on both sides of the voltage generation component; The two drive components face the two drive plates respectively, and act on the two drive plates simultaneously or alternately by blowing out air.

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