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CML B-Dot SENSOR (Full Loop)
Airborne Lightning Measurements

The CML (Cylindrical Moebius Loop) B-dot sensors (Model 7) are used to measure the currents on an aircraft surface caused by a direct or nearby lightning stroke. These probes are passive devices requiring no external power.

These sensors are cylindrical loops with one gap and the pickoff cables wired in a Moebius configuration. The voltage signal developed across the gap by the changing magnetic field associated with the skin currents is sensed in the differential mode by the pickup cables. The Moebius configuration and the differential output provide for common mode rejection of unwanted signals generated in the sensor by electric field components. The output cables of these CML sensors can exit in a variety of ways as shown on the reverse, and the ground plate is sufficiently flexible to conform to a surface with large ($1m) curvature radius.

PERTINENT EQUATION

	Vo = = sensor output (in volts)
where
	= sensor equivalent area (in m2)
	= magnetic flux density vector (in teslas)

Data Specification Sheet