GMW BARTINGTON MAG-03, Руководство по эксплуатации

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OM1004 ISSUE 20 PAGE 16 OF 30
10.4 VECTOR MEASUREMENTS
Each axis produces an analog output Va in response to flux density B in the relationship:
Va = B cos
∅
where
∅
is the angle between the flux direction and the direction of the individual sensing
element.
The scalar value of a magnetic field may be computed from the individual X, Y and Z vector
components using the RSS (Root of sum of the squares) where:
B = (Vx
2
+ Vy
2
+ Vz
2
)
½
It should be noted that there will be a small error in the result of the calculation of the total
field due to the small error in the orthogonality between the sensing elements. This will be
particularly noticeable when the total field is computed from the values measured with
several orientations of the sensor. The sensor is extremely sensitive in the measurement of
small variations in the total field provided that the orientation is constant i.e. the detector is
stationary. The sensor is therefore limited in applications requiring total field measurement
while moving, as in a towed ferrous metal detector, by the orthogonality error within the
specified tolerance.