Thermometry and Fluid Flow Metrology Group
The Thermometry and Fluid Flow Metrology Group works to establish national standards for the SI unit of temperature (K, Kelvin) and the derived units such as humidity/moisture, thermo-physical quantities (thermal conductivity, thermal diffusivity, thermal expansion, specific heat etc.), and fluid flow quantities (flow rate, flow velocity, viscosity), and to disseminate these measurement standard technologies. On top of that, based on these measurement standard technologies, our group develops core measurement technologies that are necessary at the aspect of nation and society in the fields of climate change, environment, energy, and aerospace.
Current R&D Projects
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1
Development of measurement standard technology for research on thermodynamic temperature and the International Temperature Scale of 1990
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2
Development of measurement standard technology for humidity and moisture
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3
Development of measurement standard technology for thermo-physical quantities (thermal conductivity, thermal diffusivity, thermal expansion, specific heat etc.)
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4
Development of measurement standard technology for fluid flow metrology (gas flow rate, liquid flow rate, flow velocity, viscosity)
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5
Development of measurement source technology in response to climate change and the demands of advanced industries
Recent R&D Highlights
- First observation in the world for the temperature change pattern due to solar reflection and heat radiation at the upper surface of cloud
- First establishment in the world for the calibration system (–70 ℃ ~ 20 ℃) and calibration&test procedure of radiosonde humidity sensor
- First development in the world for the on-site calibration system for hydrogen flow rate (100 National Research and Development Excellent Outcomes in 2020 year)
- World top level development of measurement technique for the assessing greenhouse gas emission flow rate at the industrial and power plant sites
- Development of tiny flow rate measurement standard system and noncontact tiny flow rate measuring sensor for improving reliability of drug injection medical device
- Development of acoustic gas thermometer working upto mid-range of temperature(420 °C)
Introducing Teams in a Group
Thermodynamic Temperature Team
The Thermodynamic Temperature Team developed an acoustic gas thermometer (AGT) capable of thermodynamic temperature measurements in the temperature range of contact thermometers. With this as a basis, the team conducts research to measure and disseminate temperature according to the new definition of the Kelvin. Furthermore, the team conducts research to develop and disseminate precision temperature measurement technology to improve upon the accuracy of the International Temperature Scale of 1990 (ITS-90).
Key Research Area
- Development of a world-class acoustic gas thermometer
- Development of acoustic gas thermometer-based thermodynamic temperature measurement technology
- Realization and dissemination of the International Temperature Scale of 1990 based on the contact temperature measurement method
- Research to improve upon the accuracy of the International Temperature Scale of 1990 based on thermodynamic temperature
Upper Air Measurement Team
The Upper Air Measurement Team establishes accurate meteorological temperature and humidity measurements standards spanning from the ground surface to the stratosphere at an altitude of 40 km using world-class temperature and humidity measurement technology. The team also conducts research on measurement technology for small amounts of stratospheric moisture, which is crucial for a more effective response to global warming and long-term climate change model tracking.
Key Research Area
- Development of upper air simulators
- Development of radiosondes based on dual temperature sensors
- Development of surface air temperature and humidity reference measurement standards
- Development of measurement technology for small amounts of stratospheric moisture using dual quartz crystal oscillators
Flow Rate Measurement Team
The Flow Rate Measurement Team establishes and develops national measurement standards and technology for fluid flow units derived from the International System of Units. The team establishes and manages fluid flow measurement standards such as gas (atmospheric pressure, high pressure) flow rate, liquid (water, oil) flow rate, flow velocity, and viscosity, while also offering calibration and testing services for domestic and overseas dissemination. Additionally, precision measurement source technologies are being developed to respond to national commerce issues and emerging industrial demands, examples of which involve greenhouse gas emission discharge rate, hydrogen fueling rate, and micro-flow rates of pharmaceutical injections.
Key Research Area
- Development of precision measurement technology for greenhouse gas smoke stack emission discharge rate in response to global climate change
- Development of a hydrogen fueling rate standard system for hydrogen fueling stations
- Development of a micro-flow rate standard system to increase the accuracy of medical injections
- Development of flow rate measurement source technology (ultrasonic, thermal) to meet the demands of the energy industry
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