Field non-magnetic constant-temperature protection device of high-precision spring type gravimeter

Abstract

The invention discloses a field non-magnetic constant-temperature protection device of a high-precision spring type gravimeter, which comprises a metal outer cover, a heat insulation layer fixed on the inner side of the metal outer cover through heat insulation glue, a metal heating wire spirally wound on the outer surface of a metal constant-temperature cylinder, and the heat insulation layer wraps the metal constant-temperature cylinder wound with the metal heating wire. The high-precision ground fixed-point relative gravimeter, the storage battery and the temperature control system are all located in the metal constant-temperature cylinder, the storage battery is connected with the high-precision ground fixed-point relative gravimeter, the storage battery is connected with the temperature control system, and the temperature control system is connected with the metal heating wire and the temperature probe. According to the invention, the stability and the windproof capability are improved, and the signal shielding function is added. The two metal heating wires with the same current magnitude and opposite directions are uniformly and spirally wound on the metal constant-temperature cylinder, so that a magnetic effect generated by the coil is effectively inhibited while uniform heating is realized during electrification, and a magnetic field cannot be generated to interfere with a gravimeter in observation.

Description

Technical Field

[0001] The invention belongs to the technical field of research and development of auxiliary equipment for high-precision ground fixed-point relative gravimeters, and in particular relates to a field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter. Background Art

[0002] Earth's gravity is an important physical quantity in geodesy, geophysics and metrology, etc. Its magnitude is mainly affected by the structure and shape of the earth.

[0003] High-precision ground-based fixed-point relative gravimeters can play an important role in geophysics, metrology and national defense security. Since static gravimeters have high accuracy, which can reach an accuracy better than 1μGal, the observed gravity values ​​can extract a lot of useful information.

[0004] At present, the micro-gamma gravimeters on the market are mainly imported zero-length spring fixed-point relative gravimeters, such as the gPhone gravimeter developed by Microg-Lacoste in the United States. Since the accuracy of the micro-gamma gravimeter reaches the order of ten to the negative eighth power, the observation environment requirements are also very high, otherwise the observation data will be affected by factors such as ambient temperature, humidity, and air pressure, and the reliability will be greatly reduced. Basically, all gravimeters are placed in special gravity observation stations for observation, including the gWave-II micro-gamma gravimeter developed by the Institute of Precision Measurement Science and Technology Innovation of the Chinese Academy of Sciences, which is placed at the Wuhan Geodetic National Field Scientific Observation and Research Station under the Institute of Precision Measurement Science and Technology Innovation of the Chinese Academy of Sciences to carry out gravity observation tasks.

[0005] The National Field Scientific Observation and Research Station has an observation pedestal specially used for installing precision geological instruments, with a stable 220V mains power supply. It also has stable observation temperature and air pressure, and is equipped with professionals to perform regular maintenance on the instruments. On this basis, it is also necessary to install observation protection devices around the gravimeter to eliminate the impact of environmental factors on the observation accuracy of the gravimeter.

[0006] Most field instrument constant temperature systems use heating plates or unidirectionally wound heating wires to increase the temperature. Both heating plates and unidirectional heating wires will generate a magnetic field when current flows. General instruments are not sensitive to this magnetic field, but high-precision spring gravimeters will be greatly affected. The reason is that the spiral spring will deform due to the electromagnetic effect in this magnetic field, and the displacement resolution of the gravimeter sensor is as high as 1nm, and the magnetic field will seriously affect its accuracy.

[0007] In summary, if a high-precision spring-type gravimeter is to be used for observation in the field, the constant temperature protection system used must not only have the function of resisting the influence of the observation environment, but also effectively suppress the magnetic flux generated by the heating wire itself. Summary of the invention

[0008] The purpose of the present invention is to solve the problem that a high-precision ground fixed-point gravimeter has no power supply and is easily disturbed by the environment during field observation, and the heating element generates a magnetic field, and to provide a field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter.

[0009] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0010] A field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter comprises a metal outer cover, a heat insulating layer, a metal constant temperature cylinder, a metal heating wire, a battery, and a temperature control system.

[0011] The heat-insulating layer is fixed to the inner side of the metal outer cover by heat-insulating glue, the metal heating wire is spirally wound on the outer surface of the metal constant temperature cylinder, the heat-insulating layer is coated on the outside of the metal constant temperature cylinder wound with the metal heating wire, the high-precision ground fixed-point relative gravimeter, the battery and the temperature control system are all located in the metal constant temperature cylinder, the battery is connected to the high-precision ground fixed-point relative gravimeter, the battery is connected to the temperature control system, and the temperature control system is respectively connected to the metal heating wire and the temperature probe.

[0012] As mentioned above, the metal cover is fixed to the ground by rivets.

[0013] As mentioned above, the metal heating wire includes a first metal heating wire and a second metal heating wire.

[0014] As described above, the temperature probe of the temperature control system monitors the temperature inside the metal thermostatic cylinder, and controls the output current to the metal heating wire based on the temperature difference between the monitored temperature inside the metal thermostatic cylinder and the set temperature value, so that the temperature inside the metal thermostatic cylinder is maintained at the set temperature.

[0015] As mentioned above, the first metal heating wire and the second metal heating wire are arranged in parallel and spirally on the outer circumference of the metal constant temperature cylinder.

[0016] As mentioned above, the currents flowing through the first metal heating wire and the second metal heating wire are opposite.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention improves stability and wind resistance, while adding a signal shielding function.

[0019] (2) Two metal heating wires with the same current magnitude and opposite current direction are evenly spirally wound around the metal constant temperature cylinder. When powered on, they not only provide uniform heating but also effectively suppress the magnetic effect generated by the coil, ensuring that no magnetic field will interfere with the gravimeter under observation.

[0020] (3. The thermal insulation layer ensures the thermal insulation effect of the entire system. The temperature control system and metal heating wire can control the temperature within a very precise range, usually better than 5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a side view of the internal structure of the present invention;

[0022] Figure 2 It is a top view of the internal structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the distribution of the first metal heating wire and the second metal heating wire of the present invention.

[0024] In the figure: 00-high-precision ground fixed-point relative gravimeter; 1-metal outer cover; 2-thermal insulation layer; 3-metal constant temperature cylinder; 4-metal heating wire; 5-battery; 6-temperature control system; 7-electric wire; 8-rivet; 41-first metal heating wire; 42-second metal heating wire; 71-first electric wire; 72-second electric wire; 81-first rivet; 82-second rivet; 83-third rivet; 84-fourth rivet; 85-fifth rivet; 86-sixth rivet. DETAILED DESCRIPTION

[0025] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0026] Embodiment 1:

[0027] A field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter is used to protect a high-precision ground fixed-point relative gravimeter 00, comprising a metal outer cover 1, a heat insulation layer 2, a metal constant temperature cylinder 3, a metal heating wire, a battery 5, a temperature control system 6, wires, and rivets 8.

[0028] Its location and connection relationship are:

[0029] The heat insulation layer 2 is fixed to the inner side of the metal outer cover 1 by heat insulation adhesive, and the heat insulation layer 2 is made of heat insulation material.

[0030] The metal heating wire includes a first metal heating wire 41 and a second metal heating wire 42, and the first metal heating wire 41 and the second metal heating wire 42 are respectively and evenly spirally wound on the outer surface of the metal constant temperature cylinder 3; the thermal insulation layer 2 is coated on the outside of the metal constant temperature cylinder 3 wound with the first metal heating wire 41 and the second metal heating wire 42, and the thermal insulation layer 2 is fixed to the inner side of the metal outer cover 1 by thermal insulation glue, and the thermal insulation layer 2 is made of thermal insulation material, and the high-precision ground fixed point relative gravimeter 00, battery 5 and temperature control system 6 are all located in the metal constant temperature cylinder 3.

[0031] Both ends of the first metal heating wire 41 and the second metal heating wire 42 are connected to the temperature control system 6 respectively. The first metal heating wire 41 and the second metal heating wire 42 can be made of copper wire.

[0032] The invention discloses a device for supplying power to a high-precision ground fixed-point relative gravimeter and shielding interference from outdoor environment.

[0033] 1. Protection method

[0034] The protection is to shield the interference of the outdoor environment to the high-precision ground fixed-point relative gravimeter 00.

[0035] The protection methods are as follows:

[0036] The metal cover 1 is fixed to the ground by rivets 8, and the metal cover 1 is arranged around the high-precision ground fixed-point relative gravimeter 00 and the battery 5; preferably, the rivets 8 include a first rivet 81, a second rivet 82, a third rivet 83, a fourth rivet 84, a fifth rivet 85, and a sixth rivet 86.

[0037] The metal outer cover 1 plays a role of windproof after being fixed. The metal outer cover 1 and the metal constant temperature cylinder 3 can be made of copper, stainless steel and other materials.

[0038] The heat insulation layer 2 serves to isolate the device from changes in ambient temperature.

[0039] The metal cover 1 is connected to the ground to shield the interference of external noise signals.

[0040] 2. Constant temperature mode

[0041] The constant temperature is to maintain the temperature around the high-precision ground fixed-point relative gravimeter 00 within a precise range.

[0042] 3. Power supply mode

[0043] The battery 5 supplies 12V DC to the temperature control system 6 and the heating wire;

[0044] The storage battery 5 also supplies 12V direct current to the high-precision ground fixed-point relative gravimeter 00.

[0045] 4. Constant temperature mode is as follows:

[0046] The battery 5 is connected to the power input interface of the temperature control system 6, and the temperature control system 6 provides heating current for the first metal heating wire 41 and the second metal heating wire 42 respectively. The battery 5 is connected to the high-precision ground fixed-point relative gravimeter 00 through the first wire 71, and the battery 5 provides power for the high-precision ground fixed-point relative gravimeter 00. The temperature control system 6 is connected to the temperature probe through the second wire 72. The temperature control system 6 monitors the temperature inside the metal constant temperature cylinder 3 through the temperature probe, and controls the output current to the first metal heating wire 41 and the second metal heating wire 42 respectively according to the temperature difference between the monitored temperature inside the metal constant temperature cylinder 3 and the set temperature value, thereby controlling the heat generation of the first metal heating wire 41 and the second metal heating wire 42, so that the temperature inside the metal constant temperature cylinder 3 is maintained at the set temperature.

[0047] The following points should be noted when installing and using the field non-magnetic constant temperature protection device of this embodiment:

[0048] 1. The metal cover 1 of the present invention must be installed on a solid ground, otherwise the fixing effect between the metal cover 1 and the ground is not good, which will not only cause the device to tilt, but also be blown by the wind;

[0049] 2. The present invention must be installed on a flat ground, otherwise a large gap will be formed between the metal cover 1 and the ground, and the windproof effect will not be achieved.

[0050] Embodiment 2:

[0051] As a preferred embodiment, on the basis of Example 1, the first metal heating wire 41 and the second metal heating wire 42 are arranged in parallel spirally on the outer periphery of the metal constant temperature cylinder 3, and the currents passed through the first metal heating wire 41 and the second metal heating wire 42 are opposite. The first metal heating wire 41 in the energized state will generate a current i1, and the second metal heating wire 42 will generate a current i2. i1 and i2 are currents of the same magnitude and opposite directions. In this way, the first metal heating wire 41 and the second metal heating wire 42 will form magnetic fields of the same magnitude and opposite directions when they are energized. The two magnetic fields cancel each other out to form a non-magnetic environment.

[0052] The following points should be noted when installing and using the field non-magnetic constant temperature protection device of this embodiment:

[0053] 1. The first metal heating wire 41 and the second metal heating wire 42 need to be wound together at the same time, and the two metal heating wires should be close together, otherwise the effect of the two magnetic fields generated to cancel each other out will be greatly reduced, resulting in a large magnetic field interference to the gravimeter.

[0054] 2. The first metal heating wire 41 and the second metal heating wire 42 need to be wound smoothly without twisting or winding, otherwise the generated magnetic field will not only be uneven but also reinforce each other, thus causing great electromagnetic interference.

[0055] Embodiment 3:

[0056] As a preferred solution, based on Example 1, the temperature control system 6 uses a PWM control method based on the temperature difference to control the current output to the first metal heating wire 41 and the second metal heating wire 42. The first metal heating wire 41 and the second metal heating wire 42 are intermittently energized under the action of the temperature control system 6 to achieve PWM-type temperature control.

[0057] It should be noted that the embodiments described in the present invention are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter, comprising a metal cover (1), characterized in that: It also includes a heat insulation layer (2), a metal constant temperature cylinder (3), a metal heating wire, a storage battery (5), and a temperature control system (6). The heat insulation layer (2) is fixed to the inner side of the metal outer cover (1) by heat insulation glue, the metal heating wire is spirally wound on the outer surface of the metal constant temperature cylinder (3), the heat insulation layer (2) is coated on the outside of the metal constant temperature cylinder (3) wound with the metal heating wire, the high-precision ground fixed-point relative gravimeter (00), the battery (5) and the temperature control system (6) are all located in the metal constant temperature cylinder (3), the battery (5) and the high-precision ground fixed-point relative gravimeter (00) are connected, the battery (5) and the temperature control system (6) are connected, and the temperature control system (6) is respectively connected to the metal heating wire and the temperature probe.

2. According to claim 1, a field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter is characterized in that: The metal outer cover (1) is fixed to the ground by means of rivets.

3. According to claim 1, a field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter is characterized in that: The metal heating wire comprises a first metal heating wire (41) and a second metal heating wire (42).

4. According to claim 1, a field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter is characterized in that: The temperature probe of the temperature control system (6) monitors the temperature inside the metal thermostatic cylinder (3), and controls the output current to the metal heating wire according to the temperature difference between the monitored temperature inside the metal thermostatic cylinder (3) and the set temperature value, so that the temperature inside the metal thermostatic cylinder (3) is maintained at the set temperature.

5. According to claim 3, a field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter is characterized in that: The first metal heating wire (41) and the second metal heating wire (42) are arranged in parallel and spirally on the outer circumference of the metal constant temperature cylinder (3).

6. According to claim 3, a field non-magnetic constant temperature protection device for a high-precision spring-type gravimeter is characterized in that: The currents flowing through the first metal heating wire (41) and the second metal heating wire (42) are opposite.

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