COMBINED TYPE BURIED OBJECT SURVEYING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a compact and convenient surveying apparatus by reducing mutual effect between both sensors without increasing the distance between a coil sensor and an antenna sensor.

SOLUTION: This combined type buried object surveying apparatus 6 has both the coil sensors 141 through 147 by an electromagnetic induction method and antenna sensors 441 and 442 by an electromagnetic wave method. The operating frequency band of the coil sensors is separated from the operating frequency band of the antenna sensors, and the coil sensors are covered with electric wave absorber effectively acting in the operating frequency band of the antenna sensors.

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