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The picture shows the Chinese Institute of Metrology researchers in the field testing vacuum quality measuring device
In the seven basic quantities of the International System of Units, the quality unit is the only one that is currently reproduced on a physical basis. However, since the physical benchmark is vulnerable to environmental impacts and has limitations in terms of long-term stability, the international plan is to redefine “kg†in 2018. By then, a natural benchmark based on the quality of quantum physics will replace the current international physical reference for the original kilogram, which will become a new source of international quality units. Since the future quality unit will be implemented in a vacuum, and the quality work standard for daily life - the weight is still used in the air, this brings a series of problems to the quality of value delivery - in addition to the need to save In the vacuum of the quality standards passed to the air, but also must be measured on the environmental parameters and real-time correction to ensure that the quality unit is re-determined, the quality of China's quality in the transmission process is accurate and reliable.
To this end, from 2013, China Metrology Institute conducted a series of studies centering on the key technologies for the transmission of quality values ​​after the new definition of quality units. After years of hard work, the project team has achieved a series of innovations in the measurement of vacuum quality, the transfer of vacuum quality standards, and the measurement and correction of special-shaped surface adsorption. It has established a measurement sensitivity of better than 0.1μg and a full-load repeatability of better than 0.47. Μg, high-accuracy vacuum mass measurement device for measurement of extended uncertainty 25 μg (k=2); formation of different material weights surface adsorption rate measurement, uncertainty evaluation and adsorption correction, air density measurement, weight exchange A series of technologies with independent intellectual property rights.
"0.1μg is equivalent to 1 kg object, it is equivalent to the relationship between 2 mosquitoes and the quality of an Airbus A320 passenger aircraft." Project leader Ren Xiaoping has played an image of the analogy, "The smaller the sensitivity, the quality measurement process The stronger the ability of the device to sense changes in quality, the higher the measurement accuracy that can be achieved."
According to reports, the high-accuracy vacuum mass measurement device established by the project successfully solved the contradiction between the system stability and the maintenance of high vacuum when measuring the vacuum mass of the weight; the non-contact molecular pump heat dissipation method and multi-point multi-parameters were adopted. The cyclic monitoring method significantly improves the measurement repeatability and stability of the device. In addition, the project also achieved accurate analysis of the adsorption of various weights and its inverse process, and the extended uncertainty of adsorption measurement was 0.0011 μg/cm2 (k=2), which reached the international advanced level.
Ren Xiaoping said that the establishment of a high-accuracy vacuum quality device and the proposed method for comparing quality measurement data with independent intellectual property rights will increase the reliability of vacuum quality quantity transmission in China, and at the same time, it will re-define the research for international quality units. And provide the basic data.
(Original title: China Metrology Institute has successfully solved the problem of mass-value transmission after redefining quality units)
High Accuracy Vacuum Quality Measurement System Establishes Successful Project Acceptance
[China Instrument Network Instrument R&D] A few days ago, the AQSIQ Scientific and Technological Planning Project “Establishment of High Accuracy Vacuum Quality Measurement System†undertaken by the China Institute of Metrology (hereinafter referred to as “China Measurement Instituteâ€) successfully passed the acceptance of experts. For the first time, the project has established a high-accuracy vacuum mass measurement device with a maximum range of 1 kg in China. The vacuum quality measurement repeatability and sensitivity have reached the international advanced level, and successfully solved the critical problem of the mass value transfer technology after the 2018 international mass unit was redefined. In order to ensure the future quality of China's quality and international equivalents, it laid the technical foundation.