Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method

A technology of falling prisms and ejection devices, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of vibration sensitivity, strong vibration, increasing the difficulty and cost of vacuum chambers, etc., so as to improve measurement accuracy, reduce difficulty and cost, reduce small height effect

Inactive Publication Date: 2014-07-23
ZHEJIANG UNIV
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Problems solved by technology

The power source motor of the falling body control system is generally located outside the vacuum chamber, and the magnetic fluid seal transmission is required to drive the bracket inside the vacuum chamber to move together, which undoubtedly increases the difficulty and cost of maintaining the vacuum chamber. Strong vibration is generated. Since high-precision gravity measurement is very sensitive to vibration, the vibration of the instrument itself will have a greater impact on the accuracy of the measurement result

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  • Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method
  • Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method
  • Catapulting type absolute gravimeter faller prism upward-throwing control device and gravity test method

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] attached figure 1 It is an electromagnetic ejection-type absolute gravimeter falling prism up-throwing control device. Its principle is to throw up the corner cube prism based on electromagnetic ejection, so that it can have a period of free rise and free fall for testing. According to the attached figure 1 It can be seen that the whole system includes a vacuum chamber 1, an ion pump 2, a power supply 3, a sealed insulated terminal 4, a lower vacuum wire 5, an upper vacuum wire 6, a perspective window mirror 7, a spring set 8, a lower coil 9, a bracket 10, Bracket 11, upper coil 12, tapered hole 13, LED14, detector 15, positioning steel ball 16, glass ball 17, corner cube prism 18, falling body shell 19. Of course, in addition to electromagnetic ejection, there are also pressure ejection methods to choose from.

[0019] The control system of the upward-throwin...

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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 [0001] The invention relates to a testing device, in particular to a control device for throwing up a falling prism of an ejection type absolute gravimeter and a gravity testing method. Background technique [0002] High-precision absolute gravity observation data are the basis for earthquake monitoring and forecasting, earth science research, resource exploration and other fields, and are also indispensable strategic data for national precision measurement, aircraft navigation and missile guidance. Therefore, the research of absolute gravimeter has attracted much attention of researchers at home and abroad. [0003] At present, international mature absolute gravimeters are generally composed of five parts: laser interference system, vacuum free fall control system, ultra-long spring vibration isolation system, high-speed signal acquisition system, data processing and instrument control system. Its principle is to use laser interferometry to accurately measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/02G01V7/14
Inventor 庞斌黄腾超贺青舒晓武刘承
Owner ZHEJIANG UNIV
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