1. National Institute of Advanced Industrial Science and Technology, National Metrology Institute of Japan, Tsukuba-Central 3, 1-1-1 Umezono, Tsukuba 305-3563, Japan e-mail:
2. Flow Measurement Consulting Laboratory Flow Col, Youkoudai 4-27-7, Isogo-ku, Yokohama 235-0045, Japan e-mail:
3. Flow Engineering Co., Ltd., Tsuruyacho 2-13-2, Kanagawa-ku, Yokohama 221-0835, Japan e-mail: