CN212207706U - Double-falling body absolute gravimeter - Google Patents
Double-falling body absolute gravimeter Download PDFInfo
- Publication number
- CN212207706U CN212207706U CN202021124998.3U CN202021124998U CN212207706U CN 212207706 U CN212207706 U CN 212207706U CN 202021124998 U CN202021124998 U CN 202021124998U CN 212207706 U CN212207706 U CN 212207706U
- Authority
- CN
- China
- Prior art keywords
- laser interferometer
- absolute gravimeter
- falling body
- placing table
- vacuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The utility model discloses a two-falling-body absolute gravimeter and test method, this two-falling-body absolute gravimeter includes the support, the laser interferometer, two vacuum falling body storehouses and data collection station, the laser interferometer is installed on the support, two vacuum falling body storehouses set up respectively in the upper and lower side of laser interferometer, the one end that two vacuum falling body storehouses are close to relatively all is equipped with the perspective window that can see through the light beam, and the two inside prism that all has its storehouse body free fall relatively, the laser interferometer is used for respectively to the perspective window transmission vertical light beam in two vacuum falling body storehouses, and receive the light beam by two prism reflections respectively, data collection station is connected with the laser interferometer electricity, be used for gathering the whereabouts distance difference of two prisms that the laser interferometer surveyed. The advantages are that: the device removes the ultralow frequency vibration isolation device with the most complex structure in the traditional absolute gravimeter, and solves the technical problem that the existing absolute gravimeter is influenced by ground vibration to affect the measurement precision.
Description
Technical Field
The utility model relates to a gravity test technical field, in particular to absolute gravimeter of two-fall.
Background
The traditional absolute gravimeter measures the gravity acceleration g by adopting a free-fall and optical interference mode, a test light path comprises a test prism and a reference prism, and the test prism does free-fall motion and is not influenced by vibration in the measurement process; however, the reference prism is affected by vibration to cause the change of the test optical path, which causes interference to the measurement. Accordingly, corresponding stabilizing measures have to be taken for the reference prism to suppress the vibration disturbances. The vibration source influencing the reference prism mainly comprises ground pulsation, artificial movement and the like, wherein the artificial movement is easy to isolate due to high frequency, but the ground pulsation has abundant components and is mainly represented by wide frequency band, large amplitude range and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a two-fall absolute gravimeter and test method are provided, the effectual defect of overcoming prior art.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
the utility model provides a two falling body absolute gravimeters, which comprises a bracket, the laser interferometer, two vacuum falling body storehouses and data collection station, above-mentioned laser interferometer installs on above-mentioned support, two above-mentioned vacuum falling body storehouses set up respectively in the upper and lower side of above-mentioned laser interferometer, two above-mentioned vacuum falling body storehouses one end that is close to relatively all is equipped with the perspective window that can see through the light beam, and the prism that can its storehouse body free fall relatively all has in the two, above-mentioned laser interferometer is used for respectively to the perspective window transmission vertical light beam in two above-mentioned vacuum falling body storehouses to respectively receive the light beam by two above-mentioned prisms reflection, above-mentioned data collection station is connected with above-mentioned laser interferometer electricity, be used for gathering the whereabouts distance difference of two prisms that the laser interferometer measured.
The utility model has the advantages that: the ultralow frequency vibration isolation device with the most complex structure in the traditional absolute gravimeter is removed, and the technical problem that the measurement precision of the existing absolute gravimeter is influenced by ground vibration is solved.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the support comprises a table top and at least three vertical support legs which are arranged at the lower end of the table top at intervals, the laser interferometer is arranged at the upper end of the table top, and the two vacuum falling body bins are respectively arranged on the laser interferometer and at the lower end of the table top.
The beneficial effect of adopting above-mentioned further scheme is that support structure is simple, and each part is arranged rationally, can carry out the asynchronous whereabouts of two prisms smoothly.
Further, the lower ends of the legs are respectively equipped with a support structure for adjusting the height thereof.
The beneficial effect of adopting above-mentioned further scheme is that the height of table top is convenient for adjust to the conditional requirement of device test, and, can ensure that whole table top keeps the level, thereby makes the test result accurate.
Further, the vacuum falling body bin comprises a closed bin body, a placing table and a moving mechanism, wherein the bin body is connected with an ion pump for vacuumizing the bin body, the placing table is arranged in the position, corresponding to the perspective window, in the bin body, and is provided with a window which is transparent up and down, the prism is placed in a window area at the upper end of the placing table, and the moving mechanism is in transmission connection with the placing table and is used for driving the placing table to vertically move in the bin body.
The beneficial effects of adopting the above further scheme are reasonable design and convenient operation and use.
Further, above-mentioned moving mechanism includes the motor, the conveyer belt, action wheel and follower, and above-mentioned motor is installed in above-mentioned storehouse body lateral wall lower extreme, and its drive shaft level stretches into above-mentioned storehouse internal portion, and the coaxial assembly of above-mentioned action wheel is in the one end that above-mentioned drive shaft stretches into the storehouse internal, and the rotatable position of installing in the upper end of above-mentioned storehouse internal portion of above-mentioned follower corresponds above-mentioned action wheel, and above-mentioned action wheel and follower are walked around to above-mentioned conveyer belt wheel, and the above-mentioned platform of placing is arranged in above-mentioned conveyer belt front side.
The beneficial effects of adopting above-mentioned further scheme are that moving mechanism reasonable in design, easy operation is convenient, can ensure to place the effective removal of platform to realize the good free fall of prism.
Further, the moving mechanism further comprises a guide rail assembly, the guide rail assembly is vertically arranged in the bin body, and the placing table can be arranged on the guide rail assembly in a vertically sliding mode.
Adopt above-mentioned further scheme's beneficial effect to do benefit to and place steady, the good up-and-down movement of platform.
Drawings
Fig. 1 is a schematic structural view of a double-falling body absolute gravimeter according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a support, 2, a laser interferometer, 3, a vacuum falling body bin, 4, a data collector, 5, a controller, 11, a table top, 12, supporting legs, 31, a bin body, 32, a placing table, 33, an ion pump, 34, a motor, 35, a prism, 121 and a supporting structure.
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 double-falling body absolute gravimeter of the present embodiment includes a support 1, a laser interferometer 2, two vacuum falling body chambers 3 and a data collector 4, where the laser interferometer 2 is mounted on the support 1, the two vacuum falling body chambers 3 are respectively disposed above and below the laser interferometer 2, two relatively close ends of the two vacuum falling body chambers 3 are respectively provided with a see-through window capable of transmitting a light beam, and both have prisms 35 capable of freely falling body relative to the chamber body inside, the laser interferometer 2 is configured to respectively emit vertical light beams to the see-through windows of the two vacuum falling body chambers 3 and respectively receive light beams reflected by the two prisms 35, and the data collector 4 is electrically connected to the laser interferometer 2 and is configured to collect a difference in falling distance of the two prisms 35 measured by the laser interferometer 2.
More specifically, the laser interferometer 2 is a conventional instrument on the market, and its internal optical fine distribution is slightly adjusted, as shown in fig. 1, it includes a beam expander 21, a beam splitter 22, a beam combiner 23, a beam shifting mirror 24, a photodiode 25, a second reflecting mirror 26 and a first reflecting mirror 27, where the beam splitter 22 is used to split two beams upwards and downwards and receive a vertical beam reflected downwards from an upper prism 35, the beam expander 21 is used to emit a beam to the beam splitter 22, the first reflecting mirror 27 is used to receive a vertical beam reflected upwards from a lower prism 35, the beam shifting mirror 24 is used to receive a beam reflected by the first reflecting mirror 27 and transmit it to the second reflecting mirror 26, and then reflected by the second reflecting mirror 26 to the beam combiner 23, and the beam combiner 23 combines two reflected beams into a beam and transmits it to the photodiode 25 for receiving.
The test method comprises the following steps:
s1, moving the prisms 35 in the two vacuum falling body bins 3 upwards to respective falling body initial positions in the bins in advance;
s2, starting the laser interferometer 2, enabling the prism 35 in the lower vacuum falling body bin 3 to freely fall, recording the falling time, and enabling the prism 35 in the upper vacuum falling body bin 3 to freely fall when the falling is carried out for a certain time and the falling process is not finished;
s3, the two prisms 35 collected by the data collector 4 are both in the free fall stageDrop distance difference S at any one time pointB-AAnd corresponding time, and calculating the absolute gravity difference g by using the following formulaA0：
Wherein, t1Is the initial point in time, t, of the free fall of the upper prism 352The end time point of the free falling body of the lower prism 35 is l, the height distance difference of the two prisms 35 at the initial positions respectively is 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:
firstly, an ultralow frequency vibration isolation device with the most complex structure in the traditional absolute gravimeter is removed;
secondly, two pyramid prisms are adopted to fall freely in sequence, and are in a free falling state and unrelated to ground vibration, so that the technical problem that the measurement precision of the existing absolute gravimeter is influenced by the ground vibration is fundamentally solved.
In a preferred embodiment, the support 1 comprises a table 11 and at least three vertical legs 12 spaced apart from each other at the lower end of the table 11, the laser interferometer 2 is mounted on the upper end of the table 11, and the two vacuum falling bodies 3 are mounted on the laser interferometer 2 and at the lower end of the table 11, respectively, and more specifically, the table 11 may be a hollow triangular frame table or a transparent disk table so that a light beam can smoothly pass through the table.
Preferably, the lower ends of the legs 12 are respectively provided with a support structure 121 for adjusting the height thereof, so as to facilitate the adjustment of the height of the table 11, and to make it at a height convenient for testing.
The support structure 121 is generally a commercially available conventional adjusting screw column, but may be other products or structures with similar effects.
In a preferred embodiment, the vacuum falling body bin 3 comprises a closed bin body 31, a placing table 32 and a moving mechanism, wherein the bin body 31 is connected with an ion pump 33 for vacuumizing the interior of the bin body, the placing table 32 is arranged in the bin body 31 at a position corresponding to a perspective window, a window which is transparent up and down is formed on the placing table 32, the prism 35 is arranged in the window area at the upper end of the placing table 32, the moving mechanism is in transmission connection with the placing table 32 and is used for driving the placing table 32 to vertically move up and down in the bin body 31, during a test, the placing table 32 with the prism 35 is moved to the initial position of a free falling body by the moving mechanism in advance, before the free falling body, the placing table 32 is rapidly moved downwards by the moving mechanism (the moving speed of the placing table 32 is greater than the speed of the free falling body of the prism 35), so that the prism 35 can well freely fall body, it has reasonable design, convenient and simple operation and use.
The optimum design of the bin body 31 is a cylindrical bin body, and the two bin bodies 31 are coaxially arranged.
More preferably, above-mentioned moving mechanism includes motor 34, the conveyer belt, action wheel and follower, above-mentioned motor 34 is installed in above-mentioned storehouse 31 lateral wall lower extreme, its drive shaft level stretches into above-mentioned storehouse 31 inside, the coaxial assembly of above-mentioned action wheel stretches into the one end in the storehouse 31 in above-mentioned drive shaft, the rotatable position of installing in the inside upper end of above-mentioned storehouse 31 of above-mentioned follower corresponds above-mentioned action wheel, above-mentioned action wheel and follower are walked around to above-mentioned conveyer belt ring, the above-mentioned platform 32 of placing is arranged in above-mentioned conveyer belt front side, and fixed with the area body coupling of conveyer belt front side, during the operation, drive action wheel fast revolution through motor 34, thereby drive the belt and rotate, and drive and place platform 32 fast migration, the design is simple.
The vacuum processing system further comprises a controller 5, wherein the controller 5 is connected with the laser interferometer 2 as a control system of the laser interferometer 2, and the controller 5 can be connected with the moving mechanism and the ion pump 33 for controlling the operation of the vacuum falling body chamber 3.
In a preferred embodiment, the moving mechanism further includes a rail assembly vertically installed in the bin 31, and the placing table 32 is vertically slidably installed on the rail assembly, and the rail assembly is designed such that the placing table 32 can move well in the vertical direction, and does not tilt or obstruct the free fall of the prism 35.
The guide rail assembly generally comprises two guide rods which are vertically arranged and distributed at intervals left and right, hole positions for the guide rods to pass through are arranged on two sides of the placing table 32, or the placing table 32 is connected with the two guide rods in a sliding mode through sliders in sliding fit with the two guide rods in a relatively sliding mode.
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 (6)
1. The utility model provides a two-fall absolute gravimeter which characterized in that: comprises a bracket (1), a laser interferometer (2), two vacuum falling body bins (3) and a data acquisition unit (4), the laser interferometer (2) is arranged on the bracket (1), the two vacuum falling body bins (3) are respectively arranged above and below the laser interferometer (2), one ends of the two vacuum falling body bins (3) which are relatively close to each other are respectively provided with a perspective window which can transmit light beams, and the two are provided with prisms (35) which can freely fall relative to the chamber bodies, the laser interferometers (2) are used for respectively emitting vertical light beams to the perspective windows of the two vacuum falling body chambers (3), and respectively receive the light beams reflected by the two prisms (35), the data collector (4) is electrically connected with the laser interferometer (2), used for collecting the difference of the falling distances of the two prisms (35) measured by the laser interferometer (2).
2. A dual-fall absolute gravimeter according to claim 1, characterized in that: the support (1) comprises a table top (11) and at least three vertical support legs (12) which are arranged at the lower end of the table top (11) at intervals, the laser interferometer (2) is arranged at the upper end of the table top (11), and the two vacuum falling body bins (3) are respectively arranged on the laser interferometer (2) and at the lower end of the table top (11).
3. A dual-fall absolute gravimeter according to claim 2, characterized in that: the lower ends of the legs (12) are each equipped with a support structure (121) for adjusting their height.
4. A dual-fall absolute gravimeter according to claim 1, characterized in that: the vacuum falling body bin (3) comprises a closed bin body (31), a placing table (32) and a moving mechanism, wherein the bin body (31) is connected with an ion pump (33) for vacuumizing the bin body, the placing table (32) is arranged in the position, corresponding to a perspective window, in the bin body (31), a window which is transparent up and down is formed in the position, the prism (35) is arranged in a window area at the upper end of the placing table (32), and the moving mechanism is in transmission connection with the placing table (32) and used for driving the placing table (32) to vertically move up and down in the bin body (31).
5. A dual-fall absolute gravimeter according to claim 4, characterized in that: moving mechanism includes motor (34), conveyer belt, action wheel and follower, motor (34) install in storehouse body (31) lateral wall lower extreme, its drive shaft level stretches into inside the storehouse body (31), the coaxial assembly of action wheel in the drive shaft stretches into the one end in the storehouse body (31), the follower is rotatable install in the upper end of the inside of the storehouse body (31) corresponds the position of action wheel, the conveyer belt loop is walked around action wheel and follower, place platform (32) and arrange in the conveyer belt front side to it is fixed with the area body coupling of conveyer belt front side.
6. A dual-fall absolute gravimeter according to claim 5, characterized in that: the moving mechanism further comprises a guide rail assembly, the guide rail assembly is vertically installed in the bin body (31), and the placing table (32) can be installed on the guide rail assembly in a vertically sliding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021124998.3U CN212207706U (en) | 2020-06-17 | 2020-06-17 | Double-falling body absolute gravimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021124998.3U CN212207706U (en) | 2020-06-17 | 2020-06-17 | Double-falling body absolute gravimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212207706U true CN212207706U (en) | 2020-12-22 |
Family
ID=73809285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021124998.3U Active CN212207706U (en) | 2020-06-17 | 2020-06-17 | Double-falling body absolute gravimeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212207706U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406715A (en) * | 2021-06-30 | 2021-09-17 | 湖北省计量测试技术研究院 | Absolute gravimeter falling body error measuring device |
-
2020
- 2020-06-17 CN CN202021124998.3U patent/CN212207706U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406715A (en) * | 2021-06-30 | 2021-09-17 | 湖北省计量测试技术研究院 | Absolute gravimeter falling body error measuring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212207706U (en) | Double-falling body absolute gravimeter | |
| CN107462227B (en) | Leveling and level error test equipment | |
| CN109269431B (en) | Crane track detection device | |
| CN106643548A (en) | Aspheric optical element surface shape detection device | |
| CN108844720B (en) | Multi-angle image quality detection device and method for optical system | |
| CN203502111U (en) | Road illumination quality detection device | |
| CN118066443A (en) | Surveying instrument and distance measurement system thereof | |
| CN212569175U (en) | Coaxial double-falling-body asynchronous falling absolute gravimeter | |
| CN111650662A (en) | Double-falling body absolute gravimeter | |
| CN113108728B (en) | X-ray imaging detection device | |
| CN212207705U (en) | Offset type double-falling-body asynchronous falling absolute gravimeter | |
| CN111650661A (en) | Coaxial double-falling-body asynchronous falling absolute gravimeter | |
| CN212207704U (en) | Asynchronous falling differential absolute gravimeter | |
| CN110850702A (en) | Watch lens detector | |
| CN2577239Y (en) | Potable laser collimator | |
| CN212363099U (en) | Grain quantity online detection system based on vision technology | |
| CN209559206U (en) | A kind of automatic total instruments | |
| CN112326777B (en) | Device for measuring the surface instability of a magnetic liquid | |
| CN111650660B (en) | Asynchronous drop differential absolute gravimeter | |
| CN208635797U (en) | A kind of mapping total station of high stability | |
| CN110361731B (en) | Geological radar device | |
| CN111650660A (en) | Asynchronous falling differential absolute gravimeter | |
| CN206804156U (en) | Adjustable Laser emission end and laser analyzer | |
| CN112066883A (en) | Grain quantity online detection system based on vision technology | |
| CN111505322A (en) | Photon measuring and reading device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |