[ Instrument Network Instrument Development ] Recently, the research team of Wuhan Institute of Physics and Mathematics of the Chinese Academy of Sciences, Zhan Mingsheng and Wang Jin led a team to make new progress in the development of a portable atomic absolute gravity meter. After several years of research, the team successfully developed a cold atomic absolute gravimeter with é“·-85 atoms as the test quality. The gravimeter is involved in the international comparison of absolute gravimeters, and the measurement results are recognized by the International Bureau of Metrology.
Gravimeters are indispensable instruments in the fields of geophysics, geodesy and metrology, and have important applications in the fields of resource exploration and inertial navigation. The cold atomic absolute gravimeter uses a laser to interact with the free-falling cold atomic mass in the gravitational field to form an interference loop. The interference fringes are obtained by measuring the atomic population in different states, and the absolute gravity of the instrument's location is derived from the phase of the fringe. value. Compared with the traditional drop-corner laser interference absolute gravimeter, the cold atom absolute gravimeter has the advantages of high sensitivity, self-calibration, long-term continuous observation, no mechanical wear and low maintenance cost. However, the experimental setup and operation of the cold atomic gravimeter is very complicated. How to develop an integrated and accurate gravimeter that is accurate and easy to handle is the key to its ability to compete with or even exceed the pyramidal laser gravimeter.
In the development process, the research team members, including associate researcher Tang Wei and doctoral student Huang Panwei, designed and realized a compact titanium ultra-high vacuum system and small size in order to meet the requirements of high-precision gravity measurement while carrying the instrument. The light path system and the integrated circuit control system have broken through the key technologies such as active vibration isolation and earth rotation compensation. The two newly discovered system error items different from the é“·-87 system have been carefully evaluated, and finally the transportable high is realized. Accuracy of the é“·-85 cold atom absolute gravimeter.
The gravimeter was transported over long-distance roads and participated in the international absolute gravimeter comparison. The final report confirmed by the International Bureau of Metrology showed that the deviation of the absolute value of gravity measurement is about 3μGal (1μGal=10nm/s2), and the expansion uncertainty is about 20μGal (95% confidence level), sensitivity up to 30 μGal/Hz1/2, long-term stability better than 1μGal (>2000s).
The research was funded by the National Key Research and Development Program, the National Natural Science Foundation, and the Strategic Science and Technology Special Project of the Chinese Academy of Sciences. The experimental research results of the instrument development process were recently published in Metrologia.
(Original title: é“·-85 cold atom absolute gravimeter developed by Wuhan Property Number)
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