Method and hand-operated sensor with adaptive detection threshold for the detection of foreign objects embedded in building structure subgrades
First Claim
1. A method for detection of objects embedded in building structure subgrades, comprising the steps of:
- sweeping a hand-operated sensor with an adaptive detection threshold over a surface area of a building structure subgrade being analyzed; and
recording a change in a direction of movement of the hand-operated sensor being swept over the surface area with respect to an embedded object;
wherein an acceleration of the hand-operated sensor is recorded in at least two directions with respect to the embedded object, wherein corresponding speed values are computed at least as estimates from acceleration values and a conclusion about a reversal of the direction of movement of the hand-operated sensor with respect to the embedded object is generated from the speed values.
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Abstract
A method for the detection of objects embedded in building structure subgrades such as cable, concrete reinforcing bars, conduit pipe and the like as well as a hand-operated sensor with an adaptive detection threshold operating according to the method, is disclosed. To reduce an over-detection with the adaptation of the detection threshold, a change in the direction of movement of the sensor being guided over the surface area is recorded with respect to an embedded object. The determination of a change in the direction of movement preferably takes place by measuring the sensor acceleration in two directions with respect to the embedded object. Corresponding speeds are computed at least as estimates from the acceleration values in order to generate a conclusion about a reversal of the direction of movement.
15 Citations
15 Claims
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1. A method for detection of objects embedded in building structure subgrades, comprising the steps of:
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sweeping a hand-operated sensor with an adaptive detection threshold over a surface area of a building structure subgrade being analyzed; and recording a change in a direction of movement of the hand-operated sensor being swept over the surface area with respect to an embedded object; wherein an acceleration of the hand-operated sensor is recorded in at least two directions with respect to the embedded object, wherein corresponding speed values are computed at least as estimates from acceleration values and a conclusion about a reversal of the direction of movement of the hand-operated sensor with respect to the embedded object is generated from the speed values. - View Dependent Claims (2)
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3. A hand-operated sensor with an adaptive detection threshold for detection of objects embedded in building structure subgrades, comprising:
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a motion sensor device, wherein the motion sensor device determines a change in a direction of movement of the hand-operated sensor when guided over a surface area with respect to an embedded object; wherein the motion sensor device includes at least one biaxial acceleration sensor and a device fed by signals of the at least one biaxial acceleration sensor for measuring a momentary sweeping speed and for recording directional change points of the hand-operated sensor sweeping over the surface area with respect to the embedded object. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for detection of objects embedded in building structure subgrades, comprising the steps of:
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sweeping a hand-operated sensor with an adaptive detection threshold over a surface area of a building structure subgrade being analyzed; recording a change in a direction of movement of the hand-operated sensor being swept over the surface area with respect to an embedded object; recording an acceleration of the hand-operated sensor in at least two directions with respect to the embedded object; computing corresponding speed values at least as estimates from acceleration values; and generating a conclusion about a reversal of the direction of movement of the hand-operated sensor with respect to the embedded object from the speed values.
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15. A hand-operated sensor with an adaptive detection threshold for detection of objects embedded in building structure subgrades, comprising:
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a motion sensor device, wherein a change in a direction of movement of the hand-operated sensor is determinable by the motion sensor device when the hand-operated sensor is guided over a surface area with respect to an embedded object; wherein the motion sensor device includes at least one biaxial acceleration sensor and a device fed by signals of the at least one biaxial acceleration sensor; and wherein a momentary sweeping speed of the hand-operated sensor is measurable by the device and wherein directional change points of the hand-operated sensor are recordable by the device.
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Specification