Length Standards Group
Length Standards are foundation of industries and sciences. We at Length Standards Section devote ourselves to various tasks in order to establish metrological standards and calibration system in the area of length (gauge blocks, line scales, EDM, laser interferometer, , step height, and refractive index) and deviation (flatness and sphericity) metrology. We construct efficient hierarchical traceability system in cooperation with calibration laboratories. At the same time, we conduct research and development activities regarding advanced length measurement science and technology.
What's New
- Released on Mar. 17, 2025
- Dr. Hori's researche result, "Advanced Laser Interferometer," (in Japanese, new window will open) was featured in the "Opening up the Future with Technology - AIST's Challenge -" section of the Nikkan Kogyo Shimbun on March 13. It will be reposted on the AIST website (in Japanese) for a limited time after a few months.
- Released on Feb. 19, 2025
- An English version of the AIST press release regarding the measurement of a sphere diameter by Dr. Kondo, Dr. Hirai, Dr. Kawashima, and Dr. Bitou on December 16, 2024 was published on January 27, 2025.
- Released on Jan. 17, 2025
- An English version of the AIST press release regarding the surface profile calibration of a sphere by Dr. Kawashima, Dr. Hirai, Dr. Kondo and Dr. Bitou on November 28, 2024 was published on December 27, 2024.
- Released on Dec. 16, 2024
- On Dec. 16, 2024, Dr. Kondo,
Dr. Hirai, Dr. Kawashima and
Dr. Bitou made an AIST press relase.
Achieving the world's highest level of precision in measuring the diameter of a sphere - One order of magnitude improvement in precision in measuring the shape of free-form lenses -(in Japanese)
It was reported in The Nikkei on Dec. 16, 2024 (in Japanese, New Window will open.). - Released on Dec. 9, 2024
- A paper on two-point diameter calibration of a sphere by a micro-coordinate measuring machine using a silicon gauge block, authored by Dr. Kondou, has been published online. Anyone can read or download the paper for free until January 26, 2025 from this link, without signing in or registering.
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Update List
- Apr. 01, 2025
- Update Members page.
(Dr. Hori has been appointed as a group leader. Dr. Hirai is on loan to another department. Update the information of Dr. Masuda).
The person responsible for calibration of gauge blocks has been replaced. - Dec. 05, 2024
- Update Dr. Kawashima's page.
- Dec. 03, 2024
- Update Members page.
(Dr. Kondo's concurrent position has been deleted and his information has been updated. Update the information of Dr. Kawashima and Dr. Masuda) - Mar. 18, 2024
- Inquiry page of Inquiry · Access Guide is updated.
(The phone number and fax number of our research group have been deleted because these will be discontinued.) - Mar. 18, 2024
- Update Dr. Hirai's page.
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The characters, tools, science, technologies, and histrical symbols regarding "length" are iconized and shown in the homepage. Their meanings are ... more!