CN103941301A - Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method - Google Patents
Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method Download PDFInfo
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- CN103941301A CN103941301A CN201410146218.8A CN201410146218A CN103941301A CN 103941301 A CN103941301 A CN 103941301A CN 201410146218 A CN201410146218 A CN 201410146218A CN 103941301 A CN103941301 A CN 103941301A
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Abstract
The invention discloses a catapulting type absolute gravimeter faller prism upward-throwing control device and a gravity test method. The device comprises a cylindrical vacuum cavity, a faller prism and an ionic pump, wherein the bottom of the vacuum cavity is provided with a catapulting device, and the center of the bottom of the vacuum cavity is provided with a perspective window lens. In the cylindrical vacuum cavity, the faller prism is thrown upwards by means of the catapulting device so that the faller prism can have a free ascending test process and a free descending test process, a test laser beam is reflected by the faller prism in a free ascending or free descending process after entering the vacuum cavity, the test laser beam emitted out and a reference laser beam intervene to generate interference fringes, and gravitational acceleration is obtained in a calculated mode by detecting zero passage positions of the fringes. The catapulting type absolute gravimeter faller prism upward-throwing control device and the gravity test method are not sensitive to residual molecular resistance in the vacuum cavity, and measurement accuracy is improved; no motor is adopted, and a vacuum transmission device does not need to be adopted.
Description
Technical field
The present invention relates to proving installation, relate in particular to ejection type absolute gravimeter falling bodies prism upthrow control device and gravity method of testing.
Background technology
High precision absolute gravity observation data is the basis in the fields such as earthquake monitoring and forecasting, geoscience research, resource exploration, is also the indispensable strategic data such as national delicate metering, aircraft navigation and missile guidance.Therefore, the research of absolute gravimeter researchist's attention extremely both at home and abroad.
At present, the absolute gravimeter of international mature is generally made up of laser interference system, vacuum freely falling body control system, overlength spring vibrating isolation system, high-speed signal acquisition system and data processing and these five parts of instrumentation control system.Its principle for utilize laser interferometry accurately measure falling bodies prism in vacuum chamber in free-falling process displacement and time to (d
i, t
i), then substitution formula d
i=d
0+ v
0t
i+ 1/2gt
i 2, obtain gravity acceleration g by the method for Mathematical Fitting.
The vacuum freely falling body control system of existing absolute gravimeter is generally made up of motor, guide rail, bracket etc.In vacuum chamber, falling bodies prism is placed on a support tray, and support tray is fixed on the slide block of line slideway of vertical direction installation, and it is connected with the motor outside vacuum chamber by machine driven system, can realize and moving up and down.In order to realize the movement of falling object of falling objects, first, by controlling motor, the falling bodies prism of support tray and the face that is placed on it is transported to vacuum chamber top; Then reverse quick rotation motor, makes support tray start to accelerate to move downward, and its acceleration is slightly larger than acceleration of gravity, and now falling objects separates with support tray, thereby realizes the movement of falling object of falling objects.In current absolute gravimeter, falling bodies prism only has a free-falling test phase, needs larger vacuum chamber height, exists measurement result to drawbacks such as survival density sensitivities in vacuum chamber simultaneously.The power source motor of falling bodies control system is generally outside vacuum chamber, need magnetic fluid seal driving could drive the bracket of vacuum chamber inside to move together, this has increased difficulty and cost that vacuum chamber maintains undoubtedly, motor runs up and reverses and also can produce stronger vibration simultaneously, because High-Precision Gravimeter Survey is very responsive for vibration, the vibration meeting of instrument itself brings greater impact measurement result precision.
Summary of the invention
In order to overcome above-mentioned deficiency, the invention provides a kind of ejection type absolute gravimeter falling bodies prism upthrow control device and gravity method of testing.
A kind of ejection type absolute gravimeter falling bodies prism upthrow control device, it comprises columniform vacuum cavity, falling bodies prism, ionic pump, the bottom of described vacuum cavity is provided with catapult-launching gear, the bottom center of vacuum cavity is provided with window mirror, described catapult-launching gear is by falling bodies prism upthrow, make falling bodies prism have one section and freely rise and the test process of free-falling, described ionic pump maintains vacuum cavity to be less than or equal to 10
?4the vacuum tightness of Pa.
Described falling bodies prism comprises falling bodies shell, in falling bodies shell, is provided with prism of corner cube, and the bottom center of falling bodies shell is provided with glass bead, and bottom is further provided with location rigidity ball, matches with catapult-launching gear.
Described catapult-launching gear comprises spring, lower coil, support, bracket, upper coil, bellmouth, LED, detector, support is the annular stent of a hollow, inside and outside arranging symmetrically respectively many identical springs, bracket is the annular supporter that radius is identical with support, spring is by bracket and vacuum cavity bottom connection, bracket inside is upper coil, LED and detector are arranged on respectively the relative seat of bracket annulus inside, symmetrical multiple same conical hole is arranged at bracket top, match with the positioning and rigid ball on falling bodies prism, complete the location of falling bodies prism.
A kind of gravity method of testing of ejection type absolute gravimeter, in columniform vacuum cavity, utilize catapult-launching gear by falling bodies prism upthrow, making falling bodies prism have one section freely rises and the test process of free-falling, testing laser bundle enters to be in after vacuum cavity and freely rises or the falling bodies prismatic reflection of free-falling process, the testing laser bundle emitting and reference laser beam are interfered generation interference fringe, by detecting the mistake zero position of striped, show that the corresponding displacement time of falling bodies is to (d
i, t
i), then utilize formula d
i=d
0+ v
0t
i+ 1/2gt
i 2matching obtains gravity acceleration g.
Beneficial effect of the present invention:
1, with respect to common free-falling formula absolute gravimeter, falling bodies prism of the present invention has one section freely to rise and one section of free-falling test phase in vacuum chamber, be equivalent to the measuring distance of original 2 times, the height that this can effectively reduce vacuum chamber, makes instrument miniaturization; Resolving in process, falling bodies prism is freely risen and dropping process in survival resistance downwards and be upwards added and offset, make whole measurement insensitive to survival resistance in vacuum chamber, improve measuring accuracy.
2, whole system does not adopt motor, does not need to adopt vacuum transmission device, difficulty and the cost of lowering apparatus design, simultaneously owing to there is no motor, can not produce strong vibration at test phase, be conducive to obtain high-precision measurement result, its theoretical precision can reach 1uGal(1uGal=1 × 10
-8m/s
2).
Brief description of the drawings
Fig. 1 is the structural representation of ejection type absolute gravimeter falling bodies prism upthrow control device of the present invention;
Fig. 2 is the vertical view of bracket;
Fig. 3 is the upward view of falling bodies prism;
Wherein: 1-vacuum cavity, 2-ionic pump, 3-power supply, 4-sealed insulation connection terminal, 5-descended vacuum wire, 6-went up vacuum wire, 7-window mirror, 8-spring, 9-lower coil, 10-support, 11-bracket, 12-upper coil, 13-bellmouth, 14-LED, 15-detector, 16-location rigidity ball, 17-glass bead, 18-prism of corner cube, 19-falling bodies shell.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing 1 is a kind of electromagnetic launch formula absolute gravimeter falling bodies prism upthrow control device, its principle is based on electromagnetic launch, prism of corner cube to be thrown, can there is one section for freely rising and the free-falling stage of testing, 1 is known with reference to the accompanying drawings, whole system comprises vacuum chamber 1, ionic pump 2, power supply 3, sealed insulation connection terminal 4, the lower vacuum wire 5 of crossing, the upper vacuum wire 6 of crossing, window mirror 7, groups of springs 8, lower coil 9, support 10, bracket 11, upper coil 12, bellmouth 13, LED14, detector 15, location rigidity ball 16, glass bead 17, prism of corner cube 18, falling bodies shell 19.Certainly except also having the modes such as pressure launches, electromagnetic launch can select.
Upthrow formula falling bodies prism control system is in a column type vacuum chamber 1, and vacuum tightness is maintained by ionic pump 2, remains on 10
?4pa magnitude.
Vacuum cavity 1 bottom center is a circular window mirror 7, and testing laser can be passed through from vacuum chamber 1 bottom upwards incident of window mirror 7, is in free-moving prism of corner cube 18 and reflects under backward and be again transferred to follow-up test system by window mirror 7.
Support 10 is empty supporter in an annular, and with vacuum chamber 1 bottom connection, torus inside is lower coil 9, and the lower vacuum wire 5 of crossing joins power supply 3 and lower coil 9 by sealed insulation connection terminal 4, and power supply 3 is powered to lower coil 9.
Inside and outside support 10, arranging symmetrically respectively 4 identical springs 8, they form groups of springs jointly.
Bracket 11 is the annular supporter that radius is identical with support 10, accompanying drawing 2 is its vertical view, groups of springs is by bracket 11 and vacuum chamber 1 bottom connection, bracket 11 inside are upper coil 12, the upper vacuum wire 6 of crossing joins power supply 3 and upper coil 12 by sealed insulation connection terminal 4, power supply 3 is powered to upper coil 12, LED14 and detector 15 are arranged on respectively the relative seat of the interior annulus of bracket 11 inside, 4 symmetrical same conical holes 13 are arranged at bracket 11 tops, its can with falling bodies on positioning and rigid ball 16 match, complete the accurate location of falling bodies prism.
Falling bodies prism is made up of prism of corner cube 18, falling bodies shell 19, positioning and rigid ball 16, glass bead 17, accompanying drawing 3 is its upward view, wherein positioning and rigid ball 16 matches with the bellmouth 13 on bracket 11, realizing falling bodies accurately locates, under falling bodies, there is a glass bead 17, can coordinate LED14 and detector 15 on bracket 11, realize the real-time measurement of diagonal cone prism 18 and bracket 11 relative positions.
Measure while beginning, bracket 11 and support 10 close contacts, on falling bodies prism, positioning and rigid ball 16, with the upper conical hole of bracket 11 to mating, completes the location of falling bodies prism, now groups of springs is in compressive state, and its anchorage force to bracket 11 is slightly less than the gravity of bracket 11, when test starts, power supply 3 respectively to lower coil 9 with upper coil 12 by the electric current of opposite direction, between upper coil 12 and lower coil 9, moment produces larger repulsion, bracket 11 is upspring together with prism of corner cube 18, along with bracket 11 and prism of corner cube 18 time, rise, groups of springs is constantly extended, when groups of springs is during in extended state, produce pulling force and act on bracket 11, the downward acceleration of bracket 11 will be greater than gravity acceleration g, bracket 11 separates with prism of corner cube 18, at this moment produce and become in the imaging of detector 15 places by glass bead 17 by LED14 institute is luminous, whole test phase melts the beginning, prism of corner cube 18 freely declines after freely rising after a while again, until again contact with bracket 11, detector 15 sends this and measures the signal finishing, and one-shot measurement finishes.
After bracket 11 is stable with respect to support 10, can repeat above-mentioned experimentation, realize repeatedly and measuring fast.
A kind of gravity method of testing of ejection type absolute gravimeter, in columniform vacuum cavity, utilize catapult-launching gear by falling bodies prism upthrow, making falling bodies prism have one section freely rises and the test process of free-falling, testing laser bundle enters to be in after vacuum cavity and freely rises or the falling bodies prismatic reflection of free-falling process, the testing laser bundle emitting and reference laser beam are interfered generation interference fringe, by detecting the mistake zero position of striped, show that the corresponding displacement time of falling bodies is to (d
i, t
i), then utilize formula d
i=d
0+ v
0t
i+ 1/2gt
i 2matching obtains gravity acceleration g.
Claims (4)
1. an ejection type absolute gravimeter falling bodies prism upthrow control device, it is characterized in that, it comprises columniform vacuum cavity (1), falling bodies prism, ionic pump (2), the bottom of described vacuum cavity (1) is provided with catapult-launching gear, the bottom center of vacuum cavity (1) is provided with window mirror (7), described catapult-launching gear is by falling bodies prism upthrow, make falling bodies prism have one section and freely rise and the test process of free-falling, described ionic pump (2) maintains vacuum cavity (1) to be less than or equal to 10
?4the vacuum tightness of Pa.
2. device according to claim 1, it is characterized in that, described falling bodies prism comprises falling bodies shell (19), in falling bodies shell (19), be provided with prism of corner cube (18), the bottom center of falling bodies shell (19) is provided with glass bead (17), bottom is further provided with location rigidity ball (16), matches with catapult-launching gear.
3. device according to claim 1, it is characterized in that, described catapult-launching gear comprises spring (8), lower coil (9), support (10), bracket (11), upper coil (12), bellmouth (13), LED(14), detector (15), support (10) is the annular stent of a hollow, inside and outside arranging symmetrically respectively many identical springs (8), bracket (11) is the annular supporter that radius is identical with support (10), spring (8) is by bracket (11) and vacuum cavity (1) bottom connection, bracket (11) inside is upper coil (12), LED(14) be arranged on respectively the relative seat of bracket (11) annulus inside with detector (15), symmetrical multiple same conical hole (13) is arranged at bracket (11) top, match with the positioning and rigid ball (16) on falling bodies prism, complete the location of falling bodies prism.
4. the gravity method of testing of an ejection type absolute gravimeter, it is characterized in that, in columniform vacuum cavity, utilize catapult-launching gear by falling bodies prism upthrow, making falling bodies prism have one section freely rises and the test process of free-falling, testing laser bundle enters to be in after vacuum cavity and freely rises or the falling bodies prismatic reflection of free-falling process, the testing laser bundle emitting and reference laser beam are interfered generation interference fringe, by detecting the mistake zero position of striped, show that the corresponding displacement time of falling bodies is to (d
i, t
i), then utilize formula d
i=d
0+ v
0t
i+ 1/2gt
i 2matching obtains gravity acceleration g.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410146218.8A CN103941301A (en) | 2014-04-13 | 2014-04-13 | Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410146218.8A CN103941301A (en) | 2014-04-13 | 2014-04-13 | Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method |
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| CN103941301A true CN103941301A (en) | 2014-07-23 |
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| CN104808254A (en) * | 2015-04-23 | 2015-07-29 | 浙江大学 | Optical multiple-frequency laser interference system for high-precision absolute gravity meter and application thereof |
| CN105182433A (en) * | 2015-06-01 | 2015-12-23 | 北京航天控制仪器研究所 | Time correlation calculation gravimeter and measurement method |
| CN105910760A (en) * | 2016-06-21 | 2016-08-31 | 中国地震局地震研究所 | Centroid detection device for absolute gravimeter falling body |
| CN106383367A (en) * | 2015-07-31 | 2017-02-08 | 中国计量科学研究院 | Absolute gravity measurement method and apparatus thereof |
| CN107121708A (en) * | 2017-05-25 | 2017-09-01 | 清华大学 | Absolute gravity measurement system and measuring method |
| CN108725852A (en) * | 2018-05-30 | 2018-11-02 | 中国科学院空间应用工程与技术中心 | A kind of electromagnetism upthrow microgravity device, control method and system |
| CN118426066A (en) * | 2024-05-17 | 2024-08-02 | 中国计量科学研究院 | Ejection device of absolute gravimeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808254A (en) * | 2015-04-23 | 2015-07-29 | 浙江大学 | Optical multiple-frequency laser interference system for high-precision absolute gravity meter and application thereof |
| CN105182433A (en) * | 2015-06-01 | 2015-12-23 | 北京航天控制仪器研究所 | Time correlation calculation gravimeter and measurement method |
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| CN106383367B (en) * | 2015-07-31 | 2018-07-10 | 中国计量科学研究院 | Absolute gravity measurement method and apparatus |
| CN105910760A (en) * | 2016-06-21 | 2016-08-31 | 中国地震局地震研究所 | Centroid detection device for absolute gravimeter falling body |
| CN107121708A (en) * | 2017-05-25 | 2017-09-01 | 清华大学 | Absolute gravity measurement system and measuring method |
| CN107121708B (en) * | 2017-05-25 | 2023-08-08 | 清华大学 | Absolute gravity measurement system and measurement method |
| CN108725852A (en) * | 2018-05-30 | 2018-11-02 | 中国科学院空间应用工程与技术中心 | A kind of electromagnetism upthrow microgravity device, control method and system |
| CN108725852B (en) * | 2018-05-30 | 2020-07-17 | 中国科学院空间应用工程与技术中心 | Electromagnetic upward-throwing microgravity device, control method and system |
| CN118426066A (en) * | 2024-05-17 | 2024-08-02 | 中国计量科学研究院 | Ejection device of absolute gravimeter |
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Application publication date: 20140723 |