| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic field environment measuring device for an AC magnetic HMT sensor, realizable at a low cost without requiring labor in its installation. SOLUTION: An AC magnetic HMT sensor 2 and a gyroscopic HMT sensor 3 are isolated to a degree which does not interfere with each other to be supported by a support member 4 comprised of a nonmental and generating no unwanted twists and bendings and the angular output difference between both HMT sensors 2, 3 at respective points is calculated by a personal computer 7, while both the HMT sensors 2, 3 are moved in the vicinity of an AC magnetic HMT source 1, and based on this difference operation result, the influence of a metal on a magnetic field is determined.
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