The detection ofinduced and remanent magnetization of subsurface featuresprovides a rapid survey technique. Rejection of the unwanted geomagnetic field and its diurnal variations is accomplished by adopting a gradient magnetometer arrangement in which only the difference signal from two magnetometers, separated by a short distance, is recorded. Nuclear resonance scalar magnetometers offer high sensitivity but have higher power requirements and therefore suffer a weight penalty relative to fluxgate types. Fluxgate magnetometers are vector sensing and their sensitivity is limited, mainly by thermally induced mechanical and electronic drift.This paper describes the development of a1-m separation, verticalcomponent, fluxgatemagnetometer that alleviatestheseproblems.Singleandmultiple array gradiometer configurations are presented, together with a description of data logging software developed to enhance survey efficiency. Survey data acquired during trials and testing are presented. The ergonomics of portable instrument surveying is also discussed.

Aerospace Research (IAR) is engaged in a collaborative project with Bombardier Aerospace. The main objective of the project is to evaluate the potential of applNg fiber-metal laminates (FML) to aircraft types manufactured by Bombardier. As a part of this project, nondestructive evaluation (NDE) procedures have been developed and used at IAR to determine the extent of damage caused by impact, corrosion and fatigue loads in a commercial FML material (GLARE). X-rays using radioopaque fluids as well as conventional and air-coupled ultrasonic and eddy current methods have been investigated. This report describes the NDE procedures employed at IAR to assess damage in FML and provides examples of the results obtained utilizing each of the inspection methods and the damage types investigated. Also, the ability of the investigated NDE methods to determine damage size and the accuracy of damage measurements is discussed.

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