CN212207705U - Offset type double-falling-body asynchronous falling absolute gravimeter - Google Patents
Offset type double-falling-body asynchronous falling absolute gravimeter Download PDFInfo
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- CN212207705U CN212207705U CN202021123735.0U CN202021123735U CN212207705U CN 212207705 U CN212207705 U CN 212207705U CN 202021123735 U CN202021123735 U CN 202021123735U CN 212207705 U CN212207705 U CN 212207705U
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Abstract
The utility model relates to an offset double-falling body asynchronous falling absolute gravimeter, which comprises a vacuum bin, an upper corner cone prism, a lower corner cone prism, a laser, a light path system, a photoelectric detection part and a signal acquisition and processor; a guide rail group is arranged in the vacuum bin; the upper corner cone prisms and the lower corner cone prisms are arranged at intervals up and down and distributed in a left-right staggered manner, the right sides of the upper corner cone prisms are arranged above the left sides of the lower corner cone prisms, and the upper corner cone prisms and the lower corner cone prisms are assembled on the guide rail group in a vertically sliding manner respectively; the light path system comprises a beam splitter, a beam combiner, a first reflector and a second reflector, the beam splitter is arranged at the lower left side inside the vacuum bin, the first reflector is arranged at the lower right side inside the vacuum bin, the second reflector is arranged at the upper right side inside the vacuum bin, and the beam combiner is arranged at the upper right side inside the vacuum bin; the laser is arranged at the position corresponding to the beam splitter, and the photoelectric detection component is arranged at the position corresponding to the beam combiner and is connected with the signal acquisition and processor. The advantages are that: the absolute gravity value with high precision can be obtained without a vibration isolation system.
Description
Technical Field
The utility model relates to a gravity test technical field, in particular to absolute gravimeter of asynchronous whereabouts of two droppings of offset-type.
Background
The traditional absolute gravimeter is generally divided into a vacuum falling body bin, a laser interferometer and a long-period vibration isolation system, wherein the vacuum falling body bin comprises a freely falling pyramid prism, the pyramid prism performs free falling body motion in a vacuum cavity during testing, the laser interferometer comprises a laser, a beam splitter, a reflector beam combiner and the like, light emitted by the laser is divided into two beams, one beam passes through the pyramid prism in the vacuum falling body bin, the other beam passes through a reference prism in the long-period vibration isolation system, finally the two beams are combined to generate interference, the interference fringes record the motion information of the freely falling pyramid prism, and the long-period vibration isolation system is used for isolating the influence of ground vibration on the reference prism. The absolute gravimeter formed by the three parts has the advantages of complex structure, large volume, inconvenient debugging and difficult transportation, and the instrument needs to be disassembled and boxed after each measuring point is measured, and then the instrument is re-assembled, debugged and measured to the next measuring point, so the miniaturized and integrated absolute gravimeter is always the requirement of the industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an absolute gravimeter of asynchronous whereabouts of two droppings of offset formula is provided, the effectual defect of overcoming prior art.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
an offset double-falling body asynchronous falling absolute gravimeter comprises a vacuum bin, an upper corner cone prism, a lower corner cone prism, a laser, a light path system, a photoelectric detection part and a signal acquisition and processor; a vertical guide rail group is arranged in the vacuum bin; the upper corner cone prism and the lower corner cone prism are arranged at intervals up and down and are distributed in a left-right staggered manner, the bottom ends of the upper corner cone prism and the lower corner cone prism are relatively close to each other, the right side of the upper corner cone prism is arranged above the left side of the lower corner cone prism, and the upper corner cone prism and the lower corner cone prism are respectively assembled on the guide rail group in a vertically sliding manner; the optical path system comprises a beam splitter, a beam combiner, a first reflector and a second reflector, wherein the beam splitter is arranged at the position corresponding to the bottom end of the left side of the upper pyramid prism and below the left side in the vacuum bin, the first reflector is arranged at the position corresponding to the beam splitter and below the right side in the vacuum bin, the second reflector is arranged at the position corresponding to the bottom end of the right side of the lower pyramid prism and above the right side in the vacuum bin, and the beam combiner is arranged at the position corresponding to the first reflector and the second reflector and above the right side in the vacuum bin; the laser is arranged at the position, corresponding to the beam splitter, on the left side of the vacuum bin, the photoelectric detection component is arranged at the position, corresponding to the beam combiner, on the right side of the vacuum bin and connected with the signal acquisition and processing unit, laser emitted by the laser is divided into two beams of light after reaching the beam splitter, one beam of light sequentially passes through the upper corner cone prism, the lower corner cone prism and the second reflector after being reflected by the beam splitter and reaches the beam combiner, the other beam of light penetrates through the beam splitter and reaches the beam combiner after being reflected by the first reflector, and the two beams of light interfere after being combined on the beam combiner.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, the upper corner cone prism and the lower corner cone prism are respectively installed inside the corresponding falling body support and are slidably installed on the guide rail group through the corresponding falling body support, the upper corner cone prism and the lower corner cone prism can respectively move relative to the corresponding falling body support in a free falling body mode, and one ends, close to each other, of the two falling body supports are respectively provided with a light transmitting area.
Furthermore, the vacuum bin comprises a closed bin body and a moving mechanism, the bin body is connected with an ion pump for vacuumizing the bin body, and the moving mechanism is used for driving the two falling body supports to move up and down respectively.
Further, above-mentioned moving mechanism is equipped with the motor including two sets of one-to-one, the conveyer belt, action wheel and follower, two sets of above-mentioned motors are installed respectively in above-mentioned storehouse body lateral wall lower extreme, the equal level of its drive shaft stretches into above-mentioned storehouse internal, the coaxial assembly of above-mentioned action wheel is in the one end in a set of above-mentioned drive shaft that corresponds stretches into the storehouse body, the rotatable position of installing in the upper end of above-mentioned storehouse internal corresponds above-mentioned action wheel of above-mentioned follower, a set of above-mentioned action wheel and follower that correspond are encircleed respectively to two sets of above-mentioned conveyer belts respectively, two above-mentioned falling body supports are arranged in one side of two.
And the collimator is arranged outside the vacuum bin, is positioned between the laser and the beam splitter and is used for expanding and collimating the light beam emitted by the laser.
The utility model has the advantages that: the structure design is reasonable, and the high-precision absolute gravity value can be obtained without a complex long-period vibration isolation system.
Drawings
Fig. 1 is a schematic structural view of the offset double-falling asynchronous falling absolute gravimeter of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a vacuum bin, 2, an upper corner cone prism, 3, a lower corner cone prism, 4, a laser, 5, a photoelectric detection part, 7, a falling body support, 8, a collimator, 9, a signal acquisition and processing system, 11, a guide rail set, 12, a bin body, 13, an ion pump, 14, a motor, 61, a beam splitter, 62, a beam combiner, 63, a first reflector, 64 and a second reflector.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Example (b): as shown in fig. 1, the offset double-falling asynchronous falling absolute gravimeter of the present embodiment includes a vacuum chamber 1, an upper corner cone prism 2, a lower corner cone prism 3, a laser 4, an optical path system, a photoelectric detection component 5, and a signal acquisition and processor 9; a vertical guide rail group 11 is arranged in the vacuum bin 1; the upper corner cone prism 2 and the lower corner cone prism 3 are arranged at intervals up and down and are distributed in a left-right staggered manner, the bottom ends of the upper corner cone prism 2 and the lower corner cone prism 3 are relatively close to each other, the right side of the upper corner cone prism 2 is arranged above the left side of the lower corner cone prism 3, and the upper corner cone prism 2 and the lower corner cone prism 3 are respectively assembled on the guide rail group 11 in a vertically sliding manner; the optical path system comprises a beam splitter 61, a beam combiner 62, a first reflector 63 and a second reflector 64, wherein the beam splitter 61 is arranged at the position corresponding to the left bottom end of the upper pyramid prism 2 at the lower left side in the vacuum chamber 1, the first reflector 63 is arranged at the position corresponding to the beam splitter 61 at the lower right side in the vacuum chamber 1, the second reflector 64 is arranged at the position corresponding to the right bottom end of the lower pyramid prism 3 at the upper right side in the vacuum chamber 1, and the beam combiner 62 is arranged at the position corresponding to the first reflector 63 and the second reflector 64 at the upper right side in the vacuum chamber 1; the laser 4 is arranged at the left side of the vacuum chamber 1 corresponding to the position of the beam splitter 61, the photoelectric detection component 5 is arranged at the right side of the vacuum chamber 1 corresponding to the position of the beam combiner 62, and the photoelectric detection component is connected with the signal acquisition and processor 9; the laser 4 is used for emitting a light beam to the beam splitter 61, and the light beam is split into two light beams which are respectively emitted to the upper corner cone prism 2 and the first reflector 63 vertically by the beam splitter 61, the two light beams of the first reflection light path and the beam combiner 62 are reflected vertically and downwards to the lower corner cone prism 3 after being received by the upper corner cone prism 2, the light beam of the lower corner cone prism 3 is reflected vertically and upwards to the second reflector 64 and is reflected to the beam combiner 62 by the second reflector 64, the beam combiner 62 is used for emitting the combined light beam to the photoelectric detection component 5, the laser emitted by the laser 4 is split into two light beams after reaching the beam splitter 61, one of the two light beams passes through the upper corner cone prism 2, the lower corner cone prism 3 and the second reflector 64 after being reflected by the beam splitter 61 and reaches the beam combiner 62, the other light beam passes through the beam splitter 61 and is reflected by the first reflector 63 and reaches the beam combiner 62, and the two beams interfere after being combined on the beam combiner 62.
When measurement is carried out, the upper corner cone prism 2 and the lower corner cone prism 3 are respectively controlled to move in an asynchronous falling body mode; the beam emitted by the laser 4 reaches a beam splitter 61, which beam splitter 61 splits the beam into two beams passing horizontally and reflecting vertically upwards. The light beam reflected upwards and vertically by the beam splitter 61 vertically enters the lower pyramid prism 3 upwards after passing through the upper pyramid prism 2, and vertically enters the second reflecting mirror 64 upwards by the lower pyramid prism 3 and then horizontally enters the beam combiner 62; the light beam horizontally passing through the beam splitter 61 is reflected by the first reflector 63 and then vertically enters the beam combiner 62, the light beam horizontally entering the beam combiner 64 after being reflected by the second reflector 64 is combined and generates interference fringes, the wave surface of the interference fringes reaches the photoelectric detection part 5, after the photoelectric detection and conversion of the photoelectric detection part 5, the signals are transmitted to the signal acquisition and processing unit 9, and the falling distance difference S of the upper corner cone prism 2 and the lower corner cone prism 3 acquired by the photoelectric detection part 5 at any time point in the simultaneous falling stage is generated at any time pointB-AThe absolute gravity difference g is calculated by the following formulaA0：
Wherein, t1Is the initial time point, t, of the free fall of the upper pyramid prism 22The finishing time point of the free falling body of the lower corner cone prism 3 is represented as l, the height distance difference of the upper corner cone prism 2 and the lower corner cone prism 3 at the initial positions respectively is represented as l, and gamma is a vertical gravity gradient value;
compared with the prior art, the utility model has the advantages of it is following and positive effect:
(1) the instrument structure is miniaturized, integrates. The structure is simple, the assembly is convenient, the processes of disassembly, assembly, debugging and the like are not required to be carried out again when the measurement is carried out at a new measuring point every time, and the workload in the absolute gravity measurement process can be greatly reduced;
(2) two pyramid prisms are adopted to fall freely in an asynchronous mode successively, the two pyramid prisms are in a free falling body state and are irrelevant to ground vibration, and the technical problem that the measurement accuracy of the existing absolute gravimeter is affected by the ground vibration is solved fundamentally.
(3) The optical path system is arranged in the vacuum chamber, so that the pollution of the atmospheric environment to the optical lens is avoided.
(4) The quantity of the parts in the instrument is greatly reduced, the failure rate of the instrument can be effectively reduced, and the stability of the instrument is enhanced.
The photoelectric detection component 5 is a conventional component, and is used for receiving photoelectric information and feeding back the photoelectric information to the signal acquisition and processing unit.
As a preferred embodiment, the upper corner cone prism 2 and the lower corner cone prism 3 are respectively installed inside corresponding falling body brackets 7 and are slidably installed on the guide rail set 11 through the corresponding falling body brackets 7, the upper corner cone prism 2 and the lower corner cone prism 3 can respectively move relative to the corresponding falling body brackets 7 in a free falling body manner, and one ends of the two falling body brackets 7 which are relatively close to each other are respectively provided with a light-transmitting area.
In this embodiment, the design of the falling body support 7 is beneficial to the assembly of the upper corner cone prism 2 and the lower corner cone prism 3, the falling is avoided, and the accuracy of the measuring result is beneficial.
Preferably, above-mentioned vacuum chamber 1 is including confined storehouse body 12 and moving mechanism, be connected with the ion pump 13 that is used for to its inside evacuation on the above-mentioned storehouse body 12, above-mentioned moving mechanism is used for ordering about two above-mentioned falling body supports 7 respectively and reciprocates, during the experiment, will place platform 7 in advance through moving mechanism and take the pyramid prism that corresponds to remove to the initial position of free falling body, before the free falling body, will place platform 7 downstream (place the speed that platform 7 moving speed is greater than the pyramid prism free falling body that corresponds) fast through moving mechanism, thereby make the free falling body that the pyramid prism that corresponds can be good, reasonable in design, convenient operation and use, and is simple.
Preferably, the moving mechanism is provided with two sets of motors 14, conveyor belts, driving wheels and driven wheels which are in one-to-one correspondence, the two sets of motors 14 are respectively installed at the lower end of the side wall of the bin body 12, the driving shafts of the two sets of motors 14 horizontally extend into the bin body 12, the driving wheels are coaxially assembled at one end of the corresponding set of driving shafts extending into the bin body 12, the driven wheels are rotatably installed at the upper end of the bin body 12 corresponding to the positions of the driving wheels, the two sets of conveyor belts respectively encircle the corresponding set of driving wheels and driven wheels, the two falling body supports 7 are respectively arranged at one side of the two sets of conveyor belts and are fixedly connected with the corresponding belt bodies at one side of the conveyor belts, the moving mechanism is simple in design, the two falling body supports 7 are respectively driven to move by the two sets of independent mechanisms, and asynchronous free falling, the whole operation is convenient and the operation is stable.
As a preferred embodiment, the vacuum chamber further includes a collimator 8, and the collimator 8 is disposed outside the vacuum chamber 1 and between the laser 4 and the beam splitter 61, and is configured to expand and collimate the light beam emitted by the laser 4.
In this embodiment, the collimator 8 can expand and collimate the light beam emitted by the laser 4, which is beneficial to good beam splitting of the light beam in the later period.
The guide rail set 11 generally includes two guide rods vertically and laterally spaced apart from each other, and the two falling body holders 7 are disposed between the two guide rods and slidably mounted on the guide rods on the corresponding sides respectively through connecting members.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. The utility model provides an asynchronous absolute gravimeter that falls of offset double-falling body which characterized in that: the device comprises a vacuum bin (1), an upper corner cone prism (2), a lower corner cone prism (3), a laser (4), a light path system, a photoelectric detection component (5) and a signal acquisition and processor (9); a vertical guide rail group (11) is arranged in the vacuum bin (1); the upper corner cone prism (2) and the lower corner cone prism (3) are arranged at intervals up and down and are distributed in a left-right staggered manner, the bottom ends of the upper corner cone prism and the lower corner cone prism are relatively close to each other, the right end of the upper corner cone prism (2) is arranged above the left end of the lower corner cone prism (3), and the upper corner cone prism and the lower corner cone prism can be assembled on the guide rail group (11) in a vertically sliding manner; the optical path system comprises a beam splitter (61), a beam combiner (62), a first reflector (63) and a second reflector (64), wherein the beam splitter (61) is arranged below the left side inside the vacuum bin (1) and corresponds to the position of the bottom end of the left side of the upper corner cone prism (2), the first reflector (63) is arranged below the right side inside the vacuum bin (1) and corresponds to the position of the beam splitter (61), the second reflector (64) is arranged above the right side inside the vacuum bin (1) and corresponds to the position of the bottom end of the right side of the lower corner cone prism (3), and the beam combiner (62) is arranged above the right side inside the vacuum bin (1) and corresponds to the positions of the first reflector (63) and the second reflector (64); the laser device (4) is arranged at the position, corresponding to the beam splitter (61), of the left side of the vacuum bin (1), the photoelectric detection component (5) is arranged at the position, corresponding to the beam combiner (62), of the right side of the vacuum bin (1) and connected with the signal acquisition and processing unit (9), laser emitted by the laser device (4) is divided into two beams of light after reaching the beam splitter (61), one beam of light is reflected by the beam splitter (61) and then sequentially passes through the upper corner cone prism (2), the lower corner cone prism (3) and the second reflector (64) and reaches the beam combiner (62), the other beam of light penetrates through the beam splitter (61) and reaches the beam combiner (62) after being reflected by the first reflector (63), and the two beams of light are interfered after being combined on the beam combiner (62).
2. An offset dual-fall asynchronous falling absolute gravimeter according to claim 1, characterized in that: go up pyramid prism (2) and lower pyramid prism (3) and install respectively inside corresponding falling body support (7), and through corresponding falling body support (7) slidable mounting in on guide rail group (11), go up pyramid prism (2) and lower pyramid prism (3) can be respectively for corresponding falling body support (7) free falling body relative motion, two one end that falling body support (7) are close to relatively is equipped with the printing opacity district respectively.
3. An offset dual-fall asynchronous falling absolute gravimeter according to claim 2, characterized in that: the vacuum bin (1) comprises a closed bin body (12) and a moving mechanism, wherein the bin body (12) is connected with an ion pump (13) for vacuumizing the bin body, and the moving mechanism is used for driving the two falling body supports (7) to move up and down respectively.
4. An offset dual-fall asynchronous falling absolute gravimeter according to claim 3, characterized in that: moving mechanism includes motor (14), conveyer belt, action wheel and the follower of two sets of one-to-one, and is two sets of motor (14) install respectively in storehouse body (12) lateral wall lower extreme, its drive shaft average level stretches into inside the storehouse body (12), the coaxial assembly of action wheel is in a set of that corresponds the one end in the storehouse body (12) is stretched into to the drive shaft, the follower is rotatable install in the inside upper end of the storehouse body (12) corresponds the position of action wheel, and is two sets of the conveyer belt is encircleed a set of that corresponds respectively action wheel and follower, two the falling body support (7) are arranged in respectively in two sets of one side of conveyer belt, and with correspond the area body coupling of conveyer belt one side is fixed.
5. An offset dual-fall asynchronous falling absolute gravimeter according to any of claims 1 to 4, characterized in that: the laser device is characterized by further comprising a collimator (8), wherein the collimator (8) is arranged outside the vacuum bin (1), is positioned between the laser device (4) and the beam splitter (61), and is used for expanding and collimating the light beam emitted by the laser device (4).
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| CN202021123735.0U CN212207705U (en) | 2020-06-17 | 2020-06-17 | Offset type double-falling-body asynchronous falling absolute gravimeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111650663A (en) * | 2020-06-17 | 2020-09-11 | 中国地震局地震研究所 | Offset type double-falling-body asynchronous falling absolute gravimeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111650663A (en) * | 2020-06-17 | 2020-09-11 | 中国地震局地震研究所 | Offset type double-falling-body asynchronous falling absolute gravimeter |
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