AIST Stories No1
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Impact in the following fields! Community lifeIndustry◦‌‌Safety and security◦‌‌Medical treatment, welfare, care giving◦Social infrastructure◦‌‌Transportation◦‌‌Medical treatment, science, biotechnology◦‌‌Food products◦‌‌Distribution and retailingAIST supporting livelihoods! 27at a glanceTerminologystandard devices. The standard devices are themselves calibrated by standard devices with even higher accuracy. In this way, the pursuit of accurate standard devices allows us to arrive at national standards and this is known as measurement traceability. Within this step by step calibration, AIST calibrates various metrology standards at the highest level.In addition, AIST is taking part in a mechanism to ensure that specified measuring instruments operating in day-to-day life such as water meters, gas meters, taximeters, blood-pressure meters, and clinical thermometers are functioning correctly. AIST carries out structural inspection and performance tests for specified measuring instruments manufactured by companies, assesses whether they meet technology standards prescribed by the act and confirms conformance. Specified measuring instruments accepted here must be inspected and certified individually by a designated verification body prior to usage. Furthermore, the entity that guarantees the correctness of measurements carried out by these designated verification bodies is AIST, with its national standards through measurement traceability. Then, if specified measuring instruments are used correctly, they can exhibit its accuracy. To this end, AIST is supporting the development of human resources for measurement such as metrology public officials and certified measurers through its Metrology Training Center.In this way, through multiple processes, which pursue accuracy, specified measuring instruments deliver to society measurements that secure the trust of consumers. The fact that we can live in a society where accurate measurements are a given is due to the appropriate functioning of regulations.Furthermore, AIST is also conducting research and development that targets an even more accurate standard. Formerly, a meter standard made from an alloy of platinum and indium was used as a length standard. Currently, the definition of one meter is a standard based on the speed of light; Japan’s national standard that realizes this is an optical frequency comb that uses the frequency of light. The world has shifted from the international meter standard with its accompanying fear of being lost or damaged and the constant need for comparison with a manmade object to a mechanism based on a fundamental physical constant: namely the speed of light in a vacuum, which can express the meter anywhere. However, when it comes to mass, the kilogram standard is still used. AIST is undertaking research on a method that utilizes atomic mass to determine mass more accurately.Moving forward, the diffusion of new types of specified measuring instruments and measurement hardware incorporating more software and telecommunications Measurement traceabilityMeasurement traceability is a mechanism whereby an unbroken chain of measurements back to the national measurement standard is maintained in the order of general purpose measuring instrument → Working standard → Secondary Measurement Standard → National standard. Further, each measurement is calibrated using a standard with precision one level higher in order that calibration of each level is carried out correctly.Source: Through and Through, Easy Measurement Book (in Japanese; editor-in-chief: Hidesuke Imai) (2007: Nikkan Kogyo Shimbun) ●Traceability example: length traceabilityPractical use standard: Block gaugeThe dimensions of faces opposing each other in a rectangular parallelepiped are utilized. Two opposing faces of a rectangular parallelepiped are polished to a high precision and finished so as to have specific dimensions.National standard for length: Optical frequency combThe current definition of one meter is the length that light propagates through a vacuum in 1/299,792,458th of a second. This is realized using an optical frequency comb. A spectrum is emitted from a comb known as an optical frequency comb using a mode locked laser. By using this optical frequency comb as a light frequency standard, the laser’s frequency can be accurately set and one meter is realized.General purpose measuring apparatusMeasurement apparatus used in product production. “Vernier, dial and digital callipers”, “Mechanical dial gauges”, “Micrometers”, etc.Unbroken chainNational standards = Primary Measurement Standards(Established by AIST) Secondary Measurement Standards (Calibrated by AIST)Working Standards(Calibrated by registered company)TraceabilityGeneral purpose measuringinstrument used by user. (Produced by manufacturer)MicrometerMechanical‌dial‌gaugeVernier, dialand digital calliper*In general, the term “scales” is called “Non-automatic Weighing instruments” in the Measurement Act.functions is predicted. There are numerous associated issues, however, such as how to protect consumers from software manipulation and how to guarantee reliability. Further advances in metrological technology are called for in order for us to be able to live with peace of mind.Impact in the following fields! Community lifeIndustry◦‌‌Safety and security◦‌‌Medical treatment, welfare, care giving◦Social infrastructure◦‌‌Transportation◦‌‌Medical treatment, science, biotechnology◦‌‌Food products◦‌‌Distribution and retailingAIST supporting livelihoods! 27at a glanceTerminologystandard devices. The standard devices are themselves calibrated by standard devices with even higher accuracy. In this way, the pursuit of accurate standard devices allows us to arrive at national standards and this is known as measurement traceability. Within this step by step calibration, AIST calibrates various metrology standards at the highest level.In addition, AIST is taking part in a mechanism to ensure that specified measuring instruments operating in day-to-day life such as water meters, gas meters, taximeters, blood-pressure meters, and clinical thermometers are functioning correctly. AIST carries out structural inspection and performance tests for specified measuring instruments manufactured by companies, assesses whether they meet technology standards prescribed by the act and confirms conformance. Specified measuring instruments accepted here must be inspected and certified individually by a designated verification body prior to usage. Furthermore, the entity that guarantees the correctness of measurements carried out by these designated verification bodies is AIST, with its national standards through measurement traceability. Then, if specified measuring instruments are used correctly, they can exhibit its accuracy. To this end, AIST is supporting the development of human resources for measurement such as metrology public officials and certified measurers through its Metrology Training Center.In this way, through multiple processes, which pursue accuracy, specified measuring instruments deliver to society measurements that secure the trust of consumers. The fact that we can live in a society where accurate measurements are a given is due to the appropriate functioning of regulations.Furthermore, AIST is also conducting research and development that targets an even more accurate standard. Formerly, a meter standard made from an alloy of platinum and indium was used as a length standard. Currently, the definition of one meter is a standard based on the speed of light; Japan’s national standard that realizes this is an optical frequency comb that uses the frequency of light. The world has shifted from the international meter standard with its accompanying fear of being lost or damaged and the constant need for comparison with a manmade object to a mechanism based on a fundamental physical constant: namely the speed of light in a vacuum, which can express the meter anywhere. However, when it comes to mass, the kilogram standard is still used. AIST is undertaking research on a method that utilizes atomic mass to determine mass more accurately.Moving forward, the diffusion of new types of specified measuring instruments and measurement hardware incorporating more software and telecommunications Measurement traceabilityMeasurement traceability is a mechanism whereby an unbroken chain of measurements back to the national measurement standard is maintained in the order of general purpose measuring instrument → Working standard → Secondary Measurement Standard → National standard. Further, each measurement is calibrated using a standard with precision one level higher in order that calibration of each level is carried out correctly.Source: Through and Through, Easy Measurement Book (in Japanese; editor-in-chief: Hidesuke Imai) (2007: Nikkan Kogyo Shimbun) ●Traceability example: length traceabilityPractical use standard: Block gaugeThe dimensions of faces opposing each other in a rectangular parallelepiped are utilized. Two opposing faces of a rectangular parallelepiped are polished to a high precision and finished so as to have specific dimensions.National standard for length: Optical frequency combThe current definition of one meter is the length that light propagates through a vacuum in 1/299,792,458th of a second. This is realized using an optical frequency comb. A spectrum is emitted from a comb known as an optical frequency comb using a mode locked laser. By using this optical frequency comb as a light frequency standard, the laser’s frequency can be accurately set and one meter is realized.General purpose measuring apparatusMeasurement apparatus used in product production. “Vernier, dial and digital callipers”, “Mechanical dial gauges”, “Micrometers”, etc.Unbroken chainNational standards = Primary Measurement Standards(Established by AIST) Secondary Measurement Standards (Calibrated by AIST)Working Standards(Calibrated by registered company)TraceabilityGeneral purpose measuringinstrument used by user. (Produced by manufacturer)MicrometerMechanical‌dial‌gaugeVernier, dialand digital calliper*In general, the term “scales” is called “Non-automatic Weighing instruments” in the Measurement Act.functions is predicted. There are numerous associated issues, however, such as how to protect consumers from software manipulation and how to guarantee reliability. Further advances in metrological technology are called for in order for us to be able to live with peace of mind.

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