| 摘要 |
A gradiometer has two magnetometers axially spaced apart by an internally non-reflecting tube. One magnetometer is attached to a light source fixed centrally of a photo multiplier array at one end of the tube. The source transmits collimated or cophasal light to the other end of the tube where it is reflected by a mirror mounted on a two axis gimbal. The other magnetometer is attached to the gimbal. The reflected light returns to the source if the magnetometers are coaxial when the magnetometer axes are not parallel, the reflected light is sensed by the photomultiplier array the outputs of which drive a servo to realign the gimbaled mirror/magnetometer arrangement to parallelism so that sensed earth's field components are eliminated during operational use of the magnetometers as a gradiometer.
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