A vertical adjustment system and device for independent optical path in absolute gravimeter

Abstract

The utility model belongs to the field of gravity measurement technology of laser interference type absolute gravimeter, and particularly relates to an independent optical path verticality adjustment system and device in an absolute gravimeter. The verticality adjustment system includes a reflector, a semi-transparent and semi-reflective mirror, a liquid phase box and a telescope. The telescope, the semi-transparent and semi-reflective mirror and the liquid phase box are arranged in sequence from top to bottom and form a straight line. The reflector and the semi-transparent and semi-reflective mirror are located on the same horizontal line. The measuring light is injected from the bottom of the independent optical path verticality adjustment system, and after multiple transmissions and / or reflections through the semi-transparent and semi-reflective mirror, the reflector and the liquid phase box, two light beams are formed to the telescope. The utility model is independent of the gravimeter, and the adjustment operation is more comfortable; the adjustment time is shorter; the components can be stably locked, and the transportation resistance and environmental adaptability are strong, and the use environment of the auxiliary gravimeter is moved from the laboratory to the field; it has universality and is suitable for the adjustment of the measuring light of all laser light interference type absolute gravimeters.

Description

Technical Field

[0001] The utility model belongs to the technical field of gravity measurement of a laser interference type absolute gravimeter, and in particular relates to a verticality adjustment system and a device for an independent optical path in an absolute gravimeter. Background Art

[0002] Gravimeters are widely used in the measurement of the earth's gravity field, solid tide observation, crustal deformation observation, and gravity exploration. By matching the gravity signals at different locations with the standard gravity map, positioning and navigation methods can be obtained. According to the anomalies or mutations of the gravity field, resources can be explored and determined. Researchers have used gravity measurements to determine the shape, location and burial depth of the underground tombs of the Ming Dynasty Thirteen Tombs in Beijing.

[0003] At present, when a laser interferometer absolute gravimeter measures gravity, a 44μrad vertical deviation of the measuring light will cause a 1μGal change in the gravity value. Therefore, the verticality of the measuring light must be adjusted during the measurement process to ensure measurement accuracy. Most existing gravimeters are laboratory instruments. An interferometer is installed in the lower instrument of the gravimeter. Each interferometer has added auxiliary components such as reflectors and collimating light tubes to achieve the function of adjusting verticality. However, the interferometer is relatively large, and the overall volume and weight of the gravimeter are relatively large; adding auxiliary components to each one is a bit wasteful; when adjusting the verticality of the measuring light of the lower instrument, it is necessary to use the upper instrument of the gravimeter, and the adjustment takes a long time; people need to kneel on the ground to see the light, which is very uncomfortable; the liquid phase box is placed in the interferometer, and it is easy to pour liquid into the instrument and damage the equipment. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art that the gravimeter adjustment time is too long, the light is inconvenient, and the liquid phase box is easy to damage the equipment, and provide an independent light path verticality adjustment system and device in an absolute gravimeter.

[0005] The technical solution adopted by the utility model to solve this problem is:

[0006] An independent optical path verticality adjustment system in an absolute gravimeter comprises a reflector, a semi-transparent and semi-reflective mirror, a liquid phase box and a telescope. The telescope, the semi-transparent and semi-reflective mirror and the liquid phase box are arranged in sequence from top to bottom and form a straight line. The reflector and the semi-transparent and semi-reflective mirror are located on the same horizontal line. Measuring light enters from below the independent optical path verticality adjustment system, and after multiple transmissions and / or reflections through the semi-transparent and semi-reflective mirror, the reflector and the liquid phase box, two light beams are formed to be directed to the telescope.

[0007] By adopting the above technical solution, the verticality adjustment system can be adjusted more comfortably without changing the verticality detection accuracy; and the adjustment time is shortened.

[0008] In the above technical solution, the independent optical path verticality adjustment system is placed above the lower instrument of the laser interferometer absolute gravimeter, and the light beam from the lower instrument of the gravimeter is emitted to the semi-transparent and semi-reflective mirror as the measuring light, and the measuring light is transmitted and reflected by the semi-transparent and semi-reflective mirror, and the transmitted light enters the telescope, and the reflected light enters the reflector and is reflected by the reflector in parallel and then irradiated on the semi-transparent and semi-reflective mirror again, and is transmitted and reflected by the semi-transparent and semi-reflective mirror, and the reflected light enters the liquid phase box, and is reflected by the liquid phase box and then irradiated on the semi-transparent and semi-reflective mirror again, and is transmitted by the semi-transparent and semi-reflective mirror, and the transmitted light enters the telescope, and finally forms two light beams directed to the telescope.

[0009] In the above technical solution, the angle between the semi-transparent and semi-reflective mirror and the light beam is 45°.

[0010] By adopting the above technical solution, only the setting of 45° angle can reflect light onto the parallelly arranged reflectors.

[0011] In the above technical scheme, the light beam from the instrument under the gravimeter is called measuring light. The measuring light is incident on the semi-transparent and semi-reflective mirror to form a first reflected light and a first transmitted light. The first transmitted light enters the telescope. The first reflected light is irradiated on the reflector to be reflected and returned to the semi-transparent and semi-reflective mirror. The first reflected light is incident on the semi-transparent and semi-reflective mirror to form a second reflected light and a second transmitted light. The second reflected light is vertically incident on the liquid phase box and reflected to form a third reflected light. The third reflected light is transmitted through the semi-transparent and semi-reflective mirror to enter the telescope. The human eye can observe two light spots of the third reflected light and the first transmitted light through the telescope.

[0012] By adopting the above technical solution, it is only necessary to observe the distance between the two light spots of the third reflected light and the first transmitted light through a telescope to determine whether the measuring light is vertical, which is simple, convenient and time-saving.

[0013] In the above technical solution, the reflector is a corner cube prism.

[0014] In the above technical solution, an attenuation plate is provided between the telescope and the semi-transparent and semi-reflective mirror.

[0015] By adopting the above technical solution, the setting of the attenuation plate can reduce the intensity of the light spot, thereby reducing damage to the eyes during observation.

[0016] In the above technical solution, the lower instrument of the gravimeter includes a collimator and a beam splitter. The lower half of the gravimeter is provided with a light hole. The collimator emits laser light to illuminate the beam splitter. The beam splitter is set at an angle of 45° to the horizontal plane, and then the beam splitter reflects the laser light and enters the vertical adjustment system above through the light hole of the lower instrument of the gravimeter.

[0017] The second invention object of the utility model is to provide an independent optical path verticality adjustment device in an absolute gravimeter using the above-mentioned independent optical path verticality adjustment system in an absolute gravimeter, comprising a supporting body, wherein a large light hole and a small light hole for passing light are respectively provided on the top and bottom of the supporting body, the telescope is fixed on the top of the supporting body by two fixing splints to receive light from the large light hole, a placement groove for placing a liquid phase box is provided at the bottom of the supporting body, and three mirror frames for fixing a semi-transparent and semi-reflective mirror, a corner cube prism, and an attenuation plate are also provided in the supporting body.

[0018] In the above technical solution, the supporting body is a cubic shell structure formed by a front panel, a rear panel, a left panel, a right panel, a bottom panel, and a top panel. The lower end of the supporting body is provided with a leveling foot. The sliding door is embedded on the front panel, and the attenuation plate is arranged parallel to the bottom panel.

[0019] In the above technical solution, a small light-through hole is provided on the side of the bottom panel close to the rear panel, and a circular groove for placing the liquid phase box is provided on the side close to the front panel.

[0020] The advantages and positive effects of the utility model are as follows: the utility model is independent of the gravimeter, and the possibility of the liquid in the liquid phase box being poured into the interferometer is eliminated, the volume of the interferometer is effectively reduced, and components are saved; the adjustment operation is more comfortable; the adjustment time is shorter; the parts can be stably locked, and the transportation resistance and environmental adaptability are strong, and the use environment of the auxiliary gravimeter is moved from the laboratory to the field; the utility model has universality and is suitable for the adjustment of the measurement light of all laser light interference type absolute gravimeters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technical solution of the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for the purpose of explanation and are not intended to limit the scope of the utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0022] Figure 1 It is a schematic diagram of the optical path of the vertical adjustment system in Embodiment 1 of the independent optical path vertical adjustment system and device in an absolute gravimeter of the utility model;

[0023] Figure 2 It is a schematic diagram of the lower instrument of a gravimeter in Embodiment 2 of a system and device for verticality adjustment of an independent optical path in an absolute gravimeter of the utility model;

[0024] Figure 3 This is a front view of Embodiment 2 of an independent optical path verticality adjustment system and device in an absolute gravimeter of the utility model;

[0025] Figure 4 It is a right side top view of Embodiment 2 of an independent optical path verticality adjustment system and device in an absolute gravimeter of the utility model;

[0026] Figure 5 It is a right bottom view of Embodiment 2 of an independent optical path verticality adjustment system and device in an absolute gravimeter of the utility model.

[0027] Description of reference numerals:

[0028] 1. Corner cube prism; 2. Semi-transparent and semi-reflective mirror; 3. Liquid phase box; 4. Attenuation plate; 5. Telescope; 6. Human eye; 7. Collimator; 8. Beam splitter; 9. Light aperture; 10. Measuring light; 11. First transmitted light; 12. First reflected light; 13. Second reflected light; 14. Second transmitted light; 15. Third reflected light. DETAILED DESCRIPTION

[0029] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked in only one place in the same drawing.

[0030] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", "fixation", "screwing" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, 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 utility model can be understood according to the specific circumstances. The present utility model is described in detail below in conjunction with the accompanying drawings.

[0031] Embodiment 1:

[0032] An independent optical path verticality adjustment system in an absolute gravimeter comprises a reflector, a semi-transparent and semi-reflective mirror 2, a liquid phase box 3 and a telescope 5. The telescope 5, the semi-transparent and semi-reflective mirror 2 and the liquid phase box 3 are arranged in sequence from top to bottom and form a straight line. The reflector and the semi-transparent and semi-reflective mirror 2 are located on the same horizontal line. Measuring light 10 is injected from below the independent optical path verticality adjustment system, and after multiple transmissions and / or reflections through the semi-transparent and semi-reflective mirror 2, the reflector and the liquid phase box 3, two light beams are formed to be directed to the telescope 5.

[0033] Furthermore, in the present embodiment, it can be considered that the independent optical path verticality adjustment system is placed above the lower instrument of the laser interferometer absolute gravimeter, and the light beam from the lower instrument of the gravimeter is emitted toward the semi-transparent and semi-reflective mirror 2 as the measuring light 10, and the measuring light 10 is transmitted and reflected by the semi-transparent and semi-reflective mirror 2, and the transmitted light enters the telescope 5, and the reflected light enters the reflector and is reflected by the reflector in parallel before being irradiated on the semi-transparent and semi-reflective mirror 2 again, and is transmitted and reflected by the semi-transparent and semi-reflective mirror 2, and the reflected light enters the liquid phase box 3, and is reflected by the liquid phase box 3 before being irradiated on the semi-transparent and semi-reflective mirror 2 again, and is transmitted by the semi-transparent and semi-reflective mirror 2, and the transmitted light enters the telescope 5, and finally forms two light beams directed to the telescope 5.

[0034] Furthermore, in this embodiment, it can also be considered that the angle between the semi-transparent and semi-reflective mirror 2 and the light beam is 45°.

[0035] Furthermore, in the present embodiment, it can also be considered that the measuring light 10 is incident on the semi-transparent and semi-reflective mirror 2 to form a first reflected light 12 and a first transmitted light 11, the first transmitted light 11 enters the telescope 5, the first reflected light 12 is irradiated on the reflector to be reflected and returns to the semi-transparent and semi-reflective mirror 2, the first reflected light 12 is incident on the semi-transparent and semi-reflective mirror 2 to form a second reflected light 13 and a second transmitted light 14, the second reflected light 13 is vertically incident on the liquid phase box 3 and is reflected to form a third reflected light 15, the third reflected light 15 is transmitted through the semi-transparent and semi-reflective mirror 2 to enter the telescope 5, and the human eye 6 can observe two light spots of the third reflected light 15 and the first transmitted light 11 through the telescope 5.

[0036] Furthermore, in this embodiment, it can also be considered that the reflector is a corner cube prism 1, and the light beam irradiated to the corner cube prism 1 from the front side can be reflected back by the corner cube prism 1 in parallel.

[0037] Furthermore, in this embodiment, it can also be considered that an attenuation plate 4 is provided between the telescope 5 and the semi-transparent and semi-reflective mirror 2 .

[0038] Furthermore, it can also be considered in this embodiment that the lower instrument of the gravimeter includes a collimator 7 and a spectroscope 8, and the lower half of the gravimeter has a light hole 9. The collimator 7 emits laser light to illuminate the spectroscope 8, and the spectroscope 8 is set at an angle of 45° to the horizontal plane, so that the spectroscope 8 reflects the laser light and enters the upper vertical adjustment system through the light hole 9 of the lower instrument of the gravimeter.

[0039] Reference Figure 1 and 2 In this embodiment, the thermally stabilized laser emits a 633nm laser, which is guided to the lower instrument of the gravimeter through an optical fiber. The lower instrument of the gravimeter includes a collimator 7 and a beam splitter 8. At the same time, a light hole 9 is provided on the lower half of the gravimeter. The collimator 7 emits laser light to irradiate the beam splitter 8. The beam splitter 8 is set at an angle of 45° to the horizontal plane, and then the beam splitter 8 reflects the laser light and enters the upper vertical adjustment system through the light hole 9 of the lower instrument of the gravimeter.

[0040] The light beam reflected by the beam splitter 8 and entering the calibration system is the measuring light 10. The measuring light 10 is incident on the semi-transparent and semi-reflective mirror 2 to form a first reflected light 12 and a first transmitted light 11. The first transmitted light 11 enters the telescope 5 through the attenuation plate 4. The first reflected light 12 is irradiated on the corner cube 1, and is irradiated on the semi-transparent and semi-reflective mirror 2 again after being reflected in parallel by the corner cube 1. The first reflected light 12 is incident on the semi-transparent and semi-reflective mirror 2 to form a second reflected light 13 and a second transmitted light 14. The second reflected light 13 is vertically incident on the liquid surface of the liquid phase box 3 and then reflected to form a third reflected light 15. The third reflected light 15 is transmitted through the semi-transparent and semi-reflective mirror 2 to enter the telescope 5. The human eye 6 can observe the two light spots of the third reflected light 15 and the first transmitted light 11 through the telescope 5. The human eye 6 observes the light spot spacing between the third reflected light 15 and the first transmitted light 11 through the telescope 5 to determine whether the measuring light 10 is vertical.

[0041] Embodiment 2:

[0042] The second invention object of the utility model is to provide an independent optical path verticality adjustment device in an absolute gravimeter using the above-mentioned independent optical path verticality adjustment system in an absolute gravimeter, including a supporting body, the top and bottom of the supporting body are respectively provided with a large light hole and a small light hole for passing light, the telescope 5 is fixed on the top of the supporting body by two fixing splints to receive light from the large light hole, the bottom of the supporting body is provided with a placement groove for placing a liquid phase box 3, and the supporting body is also provided with three mirror frames for fixing a semi-transparent and semi-reflective mirror 2, a corner cube prism 1, and an attenuation plate 4 respectively.

[0043] Furthermore, in this embodiment, it can also be considered that the supporting body is a cubic shell structure surrounded by a front panel, a rear panel, a left panel, a right panel, a bottom panel, and a top panel, and the lower end of the supporting body is provided with a leveling foot, the sliding door is embedded on the front panel, and the attenuation plate 4 is arranged parallel to the bottom panel.

[0044] Furthermore, in this embodiment, it can also be considered that a small light-through hole is provided on the side of the bottom panel close to the rear panel, and a circular groove for placing the liquid phase box 3 is provided on the side close to the front panel.

[0045] Reference Figure 3 , Figure 4 and Figure 5 This embodiment includes a corner cube prism 1, a semi-transparent and semi-reflective mirror 2, a liquid phase box 3, an attenuation plate 4 and a telescope 5, wherein the corner cube prism 1 is a mirror for reflection, and also includes a front panel, a rear panel, a left panel, a right panel, a bottom panel, a top panel, three feet, a sliding door, a plum bolt and a mirror frame.

[0046] Three feet are fixed on the bottom panel. After the initial assembly of the vertical adjustment system is completed, it is placed on the marble horizontal base. After the water bubble is placed on the top panel and leveled with the feet, the feet are locked and fixed and no longer move. A small hole is opened on the bottom panel for light transmission, and a groove is opened for placing the liquid phase box 3. The liquid phase box 3 is placed horizontally, and the liquid inside is a natural horizontal surface under static conditions. A large hole is opened on the top panel for light transmission. The telescope 5 is fixed on the top panel through two fixed clamps. The telescope 5 is used to receive light from the large hole. Three mirror frames are fixed on the back panel. The three mirror frames are fixed with a semi-transparent and semi-reflective mirror 2, a corner cube prism 1, and an attenuation plate 4 in sequence. A sliding door is embedded in the front panel, which can be pulled to the right to facilitate the removal and placement of the liquid phase box 3. At the same time, the vertical adjustment system can be used to block the wind when it is working, and can be fixed with plum blossom bolts when it is not working. The left panel, right panel, front panel, back panel, bottom panel, and top panel support the main optical structure, and are all assembled and fixed with screws and threaded glue.

[0047] The corner cube prism 1, the semi-transparent and semi-reflective mirror 2, and the attenuation plate 4 are all fixed to the frame by screws and threaded glue, and the frame is also fixed to the back panel by screws and threaded glue. The light-incoming surface of the corner cube prism 1 is perpendicular to the surface where the base plate is located, the angle between the semi-transparent and semi-reflective mirror 2 and the bottom surface is 45°, the attenuation plate 4 is arranged parallel to the bottom surface, and a light hole 9 is opened on the side of the base plate close to the back panel, and a circular groove for placing the liquid phase box 3 is provided on the side close to the front panel. The telescope 5 is clamped by two identical fixing splints and fastened by screws and threaded glue, and the two fixing splints are fastened to the top plate by screws and threaded glue.

[0048] Embodiment 3:

[0049] This embodiment uses the calibration method used in the independent optical path verticality calibration system in Embodiment 1, including the following steps:

[0050] S1. Place the calibration system above the lower instrument of the laser interferometer absolute gravimeter;

[0051] S2, push the calibration system horizontally, so that the measuring light 10 passes through the light hole 9 below the calibration system, and the third reflected light 15 hits the marking point in the groove containing the liquid phase box 3;

[0052] S3, placing the liquid phase box 3 filled with liquid in the tank;

[0053] S4. By looking down through the telescope 5 on the top of the calibration system, clear and round light spots of the first transmitted light 11 and the third reflected light 15 can be observed. The pitch and other dimensions of the lower instrument collimator 7 of the gravimeter (it can also be the level of the entire lower instrument of the gravimeter) are adjusted to make the two light spots overlap. At this time, it is considered that the verticality of the measuring light 10 is adjusted well.

[0054] By adopting the above technical solution, the adjustment time is shortened, the observation is more convenient, and the liquid phase box will not be dumped at will, reducing damage to the equipment.

[0055] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Among them, the same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. Therefore: All equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An independent optical path verticality adjustment system in an absolute gravimeter, characterized by: The invention comprises a reflecting mirror, a semi-transparent and semi-reflecting mirror (2), a liquid phase box (3) and a telescope (5), wherein the telescope (5), the semi-transparent and semi-reflecting mirror (2) and the liquid phase box (3) are arranged in sequence from top to bottom and form a straight line, and the reflecting mirror and the semi-transparent and semi-reflecting mirror (2) are located on the same horizontal line. The measuring light (10) is injected from below the independent optical path verticality adjustment system, and after multiple transmissions and / or reflections through the semi-transparent and semi-reflecting mirror (2), the reflecting mirror and the liquid phase box (3), two light beams are formed and directed toward the telescope (5).

2. The independent optical path verticality adjustment system in an absolute gravimeter according to claim 1, characterized in that: The independent optical path verticality adjustment system is placed above the lower instrument of the laser interferometer absolute gravimeter. The light beam from the lower instrument of the gravimeter is emitted as the measuring light (10) toward the semi-transparent and semi-reflective mirror (2). The measuring light (10) is transmitted and reflected by the semi-transparent and semi-reflective mirror (2). The transmitted light enters the telescope (5). The reflected light enters the reflector and is reflected by the reflector in parallel before being irradiated on the semi-transparent and semi-reflective mirror (2). The reflected light enters the liquid phase box (3) and is reflected by the liquid phase box (3) before being irradiated on the semi-transparent and semi-reflective mirror (2). The light is transmitted by the semi-transparent and semi-reflective mirror (2). The transmitted light enters the telescope (5), and finally forms two light beams directed toward the telescope (5).

3. The independent optical path verticality adjustment system in an absolute gravimeter according to claim 2, characterized in that: The angle between the semi-transparent and semi-reflective mirror (2) and the light beam is 45°.

4. The independent optical path verticality adjustment system in an absolute gravimeter according to claim 3, characterized in that: The measuring light (10) is incident on the semi-transparent and semi-reflective mirror (2) to form a first reflected light (12) and a first transmitted light (11); the first transmitted light (11) enters the telescope (5); the first reflected light (12) is irradiated on the reflector to be reflected and returned to the semi-transparent and semi-reflective mirror (2); the first reflected light (12) is incident on the semi-transparent and semi-reflective mirror (2) to form a second reflected light (13) and a second transmitted light (14); the second reflected light (13) is vertically incident on the liquid phase box (3) to be reflected to form a third reflected light (15); the third reflected light (15) is transmitted through the semi-transparent and semi-reflective mirror (2) to enter the telescope (5); and the human eye (6) can observe two light spots of the third reflected light (15) and the first transmitted light (11) through the telescope (5).

5. The independent optical path verticality adjustment system in an absolute gravimeter according to claim 1, characterized in that: The reflector is a corner cube prism (1).

6. The independent optical path verticality adjustment system in an absolute gravimeter according to claim 1, characterized in that: An attenuation plate (4) is provided between the telescope (5) and the semi-transparent and semi-reflective mirror (2).

7. The independent optical path verticality adjustment system in an absolute gravimeter according to claim 2, characterized in that: The lower instrument of the gravimeter comprises a collimator (7) and a beam splitter (8). The lower half of the gravimeter is provided with a light hole (9). The collimator (7) emits laser light to illuminate the beam splitter (8). The beam splitter (8) is arranged at an angle of 45° to the horizontal plane. Then, the beam splitter (8) reflects the laser light and enters the upper vertical adjustment system through the light hole (9) of the lower instrument of the gravimeter.

8. An independent optical path verticality adjustment device for an absolute gravimeter using the independent optical path verticality adjustment system for an absolute gravimeter as claimed in any one of claims 1 to 7, comprising a supporting body, characterized in that: A large light hole and a small light hole for passing light are respectively provided on the top and bottom of the support body; the telescope (5) is fixed on the top of the support body by two fixing clamps to receive light from the large light hole; a placement groove for placing a liquid phase box (3) is provided at the bottom of the support body; and three mirror frames are also provided in the support body for fixing a semi-transparent and semi-reflective mirror (2), a corner cube prism (1), and an attenuation plate (4), respectively.

9. The device for adjusting verticality of independent optical paths in an absolute gravimeter according to claim 8, characterized in that: The supporting body is a cubic shell structure formed by a front panel, a rear panel, a left panel, a right panel, a bottom panel, and a top panel. The lower end of the supporting body is provided with a leveling foot. The front panel is embedded with a sliding door. The attenuation sheet (4) is arranged parallel to the bottom panel.

10. The device for adjusting verticality of independent optical paths in an absolute gravimeter according to claim 9, characterized in that: A small light-through hole is provided on the side of the bottom panel close to the rear panel, and a circular groove for placing a liquid phase box (3) is provided on the side close to the front panel.

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