Not only one-dimensional length metrology in a specific direction in interest, but also two-dimensional or even three-dimensional length metrology becomes one of key issues in manufactruring industry today. Dimensional Standards Group pursues realization of state of the art standard development and the dissemination of the outcome toward industry for achieving the linking functionality expected.

1. Highly accurate calibration technologies for various gauges e.g. stepgauge, ball bar, ball/hole plate, two dimensional grid plate, and so on has been developed and active in the calibration service for industry.

2. World leading angular standard, realized by self calibration technique originally proposed by NMIJ, indispensable for accurate calibration of polygonal mirrors, autocollimator, rotary encoder, and fractional angle interferometer are maintained and sophisticated for further development.

3. Adding to evaluation of external dimension, realization of measurement capability of internal dimension has become a hot topic in the field of dimensiona metrology. NMIJ pursues development of dimensional X-ray CT and realizaion of calibration system utilized for the instrument.

4. NMIJ organizes consoutiums for optical coordinate metrology and that for dimensiona X-ray CT for exchanging valuable information for experts in industry, as well as for paying effort for developing industrial standards demanded.