The 10th International Comparison academic seminar

Hold! On October 23, the two-day symposium on "the 10th International Comparison of global absolute gravimeters" was held in Changping District of the Chinese Academy of Metrology (hereinafter referred to as "the Chinese Academy of Metrology")

Professor James E. faller, former chairman of Jila laboratory and winner of the U.S. president's science and technology award, Professor Alessandro germanak, chairman of the gravity working group of the International Advisory Committee on quality and related quantities, and Dr. Derek, chairman of the new gravity measurement technology working group of the international geodetic Association, Dr. Richard, head of the global gravity reference working group of the international geodetic Association, and other "big names" in the field of international gravity, together with relevant domestic academicians and experts, gathered together to carry out academic exchanges and discussions around the global absolute gravity measurement instruments and new technologies

in his welcome speech, the president of the Chinese Academy of Metrology briefly introduced the research work of the absolute gravimeter of the Chinese Academy of Metrology and its previous participation in international comparisons. The direction pointed out that as the leading laboratory for this international comparison, the Chinese metrology institute has been prepared and will shoulder the corresponding international and obligations

Zhang Yiqun, deputy director of the Metrology Department of the General Administration of quality supervision, inspection and quarantine, pointed out in his speech that this seminar has built a platform in the field of global gravity measurement research, and will make an important contribution to improving the level of global gravity measurement technology by turning on power once a month. In the future, China will continue to deepen international measurement cooperation, jointly build a global measurement network, and promote global scientific and technological progress, trade facilitation, and economic integration

Professor Alessandro germank, chairman of the gravity working group of the International Advisory Committee on quality and related quantities, first emphasized the significance of this international comparison in his speech. He pointed out that the measurement results of gravimeters determine the measurement results in many fields. The international comparison of gravimeters can help confirm the measurement results and ensure the global equivalence and consistency of the measurement results

James, winner of the U.S. presidential science and technology award. Professor Jame e e faller and Dr. Wu Shuqing, director of the gravity Laboratory of the Chinese Academy of metrology, delivered the conference reports on "absolute gravity measurement" and "Asia's first global gravity comparison point" respectively

subsequently, the participants conducted in-depth academic exchanges and discussions on global absolute gravity measurement, research, application and other related issues. During the seminar, some delegates also visited the gravity laboratory and time frequency laboratory of the Chinese Academy of metrology

gravitational acceleration g is a physical quantity that changes with time and place. Its precision makes the structure of domestic software more reasonable. Measurement has a wide and far-reaching impact in the fields of Metrology science, national defense and military, geological exploration, geological research and earthquake prediction. The international key comparison of absolute gravity measurement instruments is an authoritative international activity to determine the traceability and source of the global gravity value, which is known as the "Olympic Games" in the field of gravity measurement. The international comparison of global absolute gravimeters began in 1981 and is held every four years. Since 1981, it has been held in Europe for more than 30 years. In 2015, after fierce competition, the Chinese metrology institute won the right to host the 10th global absolute gravimeter international comparison in 2017, which still imported some high-quality steel pairs of special categories, which means that this important international comparison has moved out of Europe and came to China for the first time in 36 years

the 10th International Comparison of global absolute gravimeters began on October 16 and lasted for one month. The most accurate absolute gravimeters from nearly 20 countries and economies around the world gathered in Beijing for comparison. After this international comparison, this international comparison point of absolute gravimeter, which is the only one in use and the highest level in the world, owned by the Chinese Institute of metrology, will become the traceability and reference point of the global gravity measurement value, and transmit the gravity acceleration value for the world

this seminar is a "highlight" during the international comparison, which was presided over by Duan Yuning, Secretary of the Party committee of the Chinese Academy of metrology. More than 120 leaders from the Ministry of science and technology, the Ministry of finance, the National Bureau of Surveying and mapping geographic information and other relevant leaders, the Metrology Department of the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China and the quality of its devices have a great impact on the experimental operation. Relevant responsible comrades from the technology department and the planning and finance department, academicians in the field of gravity, domestic and foreign experts, and scientific research and management personnel from the Chinese Academy of Metrology attended the seminar

the measurement results of gravimeters determine the measurement results in many fields. The international comparison of gravimeters can help confirm the measurement results and ensure the global equivalence and consistency of the measurement results. In the future, China will continue to deepen international measurement cooperation, jointly build a global measurement network, and promote global scientific and technological progress, trade facilitation, and economic integration