Division of Mechanics and Acoustics

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Address: No.18,Bei San Huan
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Division of Mechanics and Acoustics Won Second Prize for National Science and Technology Award

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The annual National Science and Technology Awards Conference for 2011 was held at the Great Hall of People in Beijing on the morning of February, 14, 2012. The project, Development of a Novel Route of Length Measurement And Establishment of Solid Density Primary Standard, which was completed by Division of Mechanics and Acoustics, won second prize for National Science and Technology Awards 2011.

The project after winning the award aroused a broad social effect. Many newspapers, magazines and websites, such as Science and Technology Daily, China Quality and China Quality and Technical Supervision, comprehensively reported the project with title From water to single crystal sphere-The accuracy improvement of national primary density standard, The challenge to the limits of length measurement, The expedition in the sky of scientific research, At the forefront of international metrology research, and leading the innovation for length measurement.

Adopting new principle and method, the project of “Development of a Novel Route of Length Measurement And Establishment of Solid Density Primary Standard” proposed and realized a length measurement method with high accuracy for the first time in the world, and the method was named mechanical scanning phase shift interferometry method. This project achieved the diameter measurement for single crystal sphere with sub-nanometer accuracy, and significant breakthrough for the length measurement, which fills the gap in this international research field. By using the method proposed in this project, the national primary density standard was established with uncertainty 2×10-7 (k=2). It is the first time to realize the national primary density standard with such high accuracy in the world by using method except “Frequency Tuning Method”, which is at the forefront of the international metrology research field. This achievement has become the support technology for China to carry out Avogadro constant number (NA) measurement and international research cooperation. The sub-nanometer length measurement accuracy of this method has important significance for China to meet the measurement requirement of tiny deformation, small workpiece size, and material thermal expansion coefficient. This achievement is useful to promote the integral science and technology ability of China.