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h1 title img:National Metrology Institute of Japan

Development, dissemination, and use promotion of measurement standards and development of standards-related measurement technologies

As the national metrology institute (NMI), we are focusing on the development and dissemination of measurement standards, promotion of measurement standards utilization, development of measurement technologies related to measurement standards, legal metrology work and training of experts. Our activity covers engineering, physical, material, and chemical measurement standards. It also covers development of measurement and analytical instrumentation. We also coordinate international activities on metrology standards as a national representative.

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New Research Results

Development of a high precision thermometer for the use at around 1000 °C

AIST, in collaboration with Chino Corporation, has developed a platinum resistance thermometer equipped with platinum wire in its sensor that can precisely measure temperature at around 1000 °C. By heat-cycling tests, the platinum wire was examined to find optimum conditions for stabilizing the resistance value. As a result, the resistance value is stable even at high temperatures around 1000 °C. Furthermore, a new sensor structure was devised to reduce thermal strain of the platinum wire at high temperature. The developed platinum resistance thermometer can measure temperatures at the 0.001 °C level of precision even at high temperature.

Figure of Appearance of the newly developed platinum resistance thermometer and sensor at the tip

Appearance of the newly developed platinum resistance thermometer (left) and sensor at the tip (right)

Development of technique for easily measuring moisture content of agricultural products using an electromagnetic wave

AIST has developed a measurement method for moisture content of agricultural products. The moisture content is an important index of quality. However, conventional methods are problematic in terms of time and effort. In the developed method, agricultural products on a conveyer belt are irradiated using an electromagnetic wave and signal analysis of the transmitted wave is then performed. Since the data is acquired within one second, all products can be inspected in close to real time. Agricultural products can also be measured after being boxed, and therefore this method is expected to facilitate sorting and quality control at the production site.

Principle of moisture content measurement using a microstrip transmission line figure

Principle of moisture content measurement using a microstrip transmission line


Research Unit

Research Institute for Engineering Measurement
Research Institute for Physical Measurement
Research Institute for Material and Chemical Measurement
Center for Quality Management of Metrology

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