| 摘要 |
A system for measuring stress, especially a high degree of stress, in a magnetically conductive member which provides for the generation of a magnetic field about the member and a pickup mechanism which is magnetically coupled to the member. The output of the pickup mechanism is passed through a filter rejecting all but the third harmonic of the field-generating drive signal frequency. The third harmonic is related to the stress in the member since a varying stress in the member similarly varies the nonlinearity of the B-H curve of the member. This in turn varies the amount of the third harmonic signal present at the filter output.
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