Magnetic Anomaly Detection System
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The MADS system consists of two high-speed digital fluxgate APS 540* magnetometers. With a sample rate of 250 times/sec, the Nyquist theorem dictates that the maximum frequency detectable is 125 Hz. A filter has been fitted permanently in the sensors to block frequencies above this value and avoid problems with aliasing. The digital sensors are connected, via RS232 cables, to separate Dell laptop computers.
540 Sensor specification
Accuracy ±1% FS
* Though the 540 is no longer manufactured, the 539 model has a very similar specification.