A double-vacuum-cavity fall control absolute gravimeter and its application method
An absolute gravimeter and double vacuum technology, which is applied in the direction of instruments, scientific instruments, and gravitational field measurement, can solve problems such as strong vibration and the impact on the accuracy of measurement results, and achieve the effects of small vibration, reduced design difficulty, and reduced measurement errors
Inactive Publication Date: 2017-01-11
ZHEJIANG UNIV
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Problems solved by technology
The high-speed operation and reverse rotation of the motor will also generate strong vibration, which will be transmitted to the measurement system through the ground, which will have a greater impact on the accuracy of the measurement results
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] Such as figure 1 As shown, the present invention includes a horizontal base 1 , a double vacuum cavity drop control system 2 , a laser interference system 3 , a vibration isolation system 4 , a rubidium atomic clock 5 and a host computer 6 .
[0022] The horizontal foundation 1 comprises a support platform 10, 3 identical pillars 11 and a level adjuster 12 arranged under each pillar.
[0023] The double vacuum chamber drop control system 2 is placed on the support platform 10, which includes a large vacuum chamber 20 and a small vacuum chamber 21, both of which are cylindrical cavities made of non-magnetic materials, which can effectively shield electromagnetic interference during the measurement process. A perspective window 23 is arranged at the lower part of the large vacuum chamber shell 22, so that the measuring laser beam can pass up and down. The ion pu...
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The invention discloses a double-vacuum cavity type fall control absolute gravity meter and an application method. The double-vacuum cavity type fall control absolute gravity meter comprises a horizontal substrate, a double-vacuum cavity fall control system, a laser interference system, a vibration isolating system, a rubidium atomic clock and an upper computer, wherein the double-vacuum cavity fall control system is located on the horizontal substrate, the laser interference system is located under the horizontal substrate, and the vibration isolating system is located under the laser interference system. According to the double-vacuum cavity type fall control absolute gravity meter, a fall prism is located in a small vacuum cavity, the vacuum degree can be lower than 10-6 Pa, the remnant molecule resistance is reduced, and the measurement error is lowered. A fall control power source linear ultrasonic motor is small in volume, precision in location, small in vibration and capable of effectively reducing the volume of the vacuum cavity and lowering the vacuum cavity design difficulty and vacuum degree maintaining cost, and moreover, the vibration is smaller when the linear ultrasonic motor jacks up the falling body towards the upside and releases the falling body towards the downside, and the measurement error caused by vibration is effectively reduced.
Description
technical field [0001] The invention relates to a test device, in particular to a double-vacuum-chamber drop control absolute gravity test device and an application method. Background technique [0002] The gravity field is the basic geophysical field that reflects the earth's internal material structure and its changes. High-precision absolute gravity observation data are the basis for earthquake monitoring and forecasting, earth science research, resource exploration, etc. Indispensable strategic data. Absolute gravimeter is the main precision measuring instrument used to directly measure the acceleration of gravity and its changes, and its research is highly valued by researchers at home and abroad. [0003] At present, international mature absolute gravimeters mainly use laser interferometry to accurately measure the trajectory of a falling prism falling freely in a vacuum environment, and then compare the measured displacement time to (h i ,t i ) into the free fall m...
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IPC IPC(8): G01V7/14
Inventor 黄腾超庞斌贺青舒晓武刘承
Owner ZHEJIANG UNIV