| 摘要 |
To compensate the Doppler flow measurement for the angle of the ultrasonic beam relative to the flowing medium, the ultrasonic applicator includes a mechanical electrical angular position sensor for generating a signal as the applicator is shifted from a perpendicular relationship to the flow axis to a desired oblique angular relationship. As a particularly preferred embodiment, a rotary member is held relative to the flow axis as the applicator axis is rotated, placing a strain gauge under a proportional tension to unbalance a bridge circuit. A further development provides a sensor output as a function of the cosine of the angle of interest so that the bridge output is in the form required to compensate the flow measurement signal without a prior trigonometric operation thereon.
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