A position-determining device for a hand-held material testing apparatus detects a distance traveled by the material testing apparatus. The position-determining device includes at least one signal transmitter unit and at least one sensor unit. The signal transmitter unit is for an arrangement on a rolling element of the material testing apparatus. The signal transmitter unit includes at least one signal transmitter element configured to change a measurement signal as a function of a rotational position of the rolling element. The at least one sensor unit is provided for an arrangement on a chassis of the material testing apparatus and for detecting the measurement signal. The signal transmitter element is configured as an inductive signal transmitter element. The sensor unit is configured as an inductive sensor unit. The inductive signal transmitter element and the inductive sensor unit are configured for inductive coupling to one another.--

A position-determining device for a hand-held material testing apparatus detects a distance traveled by the material testing apparatus. The position-determining device includes at least one signal transmitter unit and at least one sensor unit. The signal transmitter unit is for an arrangement on a rolling element of the material testing apparatus. The signal transmitter unit includes at least one signal transmitter element configured to change a measurement signal as a function of a rotational position of the rolling element. The at least one sensor unit is provided for an arrangement on a chassis of the material testing apparatus and for detecting the measurement signal. The signal transmitter element is configured as an inductive signal transmitter element. The sensor unit is configured as an inductive sensor unit. The inductive signal transmitter element and the inductive sensor unit are configured for inductive coupling to one another.--

A buried object scanning device 10 includes a capacitance sensor 13, a search image conversion processing unit 25, a memory unit 22, a display unit 12, an operation input unit 15, and a display control unit 30. The capacitance sensor 13 detects a buried object 51. The search image conversion processing unit 25 converts the detection result of the capacitance sensor 13 into a search image. The memory unit 22 stores search images and a grid layer including grid lines corresponding to a specific scale. The display unit 12 displays the search images and the grid layer. The display control unit 30 controls the display unit 12 so as to display the search image superimposed with the grid layer and to display the search image in a state of being movable relative to the grid layer, in response to input to the operation input unit 15.

A method for operating a hand-held material investigation device includes transmitting a measurement signal into an object under investigation, and acquiring a position of the material investigation device in relation to a surface of the object under investigation in order to determine a material property of a region, concealed behind the surface, of the object under investigation in a space-resolved and/or direction-resolved manner. The method further includes displaying the material property as at least one digital display object with a physical display unit, and displaying additional measurement information with the same at least one digital display object by way of color coding of the at least one digital display object.

A method for operating a hand-held material investigation device includes transmitting a measurement signal into an object under investigation, and acquiring a position of the material investigation device in relation to a surface of the object under investigation in order to determine a material property of a region, concealed behind the surface, of the object under investigation in a space-resolved and/or direction-resolved manner. The method further includes displaying the material property as at least one digital display object with a physical display unit, and displaying additional measurement information with the same at least one digital display object by way of color coding of the at least one digital display object.

Disclosed are an underwater ferromagnetic target detection method and system employing multiple power frequency radiation sources, pertaining to the technical field of non-acoustic underwater detection. The method includes: a power transmission network generating a power frequency electromagnetic field in a spatial range, and an underwater ferromagnetic target generating an electromagnetic field under the combined action of the power frequency electromagnetic field and seawater inside and outside the underwater ferromagnetic target; if there are multiple ships on the water serving as secondary radiation sources acting on the underwater ferromagnetic target, obtaining a secondary magnetic field generated by the underwater ferromagnetic target, and adding the secondary magnetic field and the electromagnetic field generated by the underwater ferromagnetic target under the combined action of the power frequency electromagnetic field and the seawater inside and outside the underwater ferromagnetic target to obtain a total electromagnetic field generated by the underwater ferromagnetic target; and acquiring a power frequency electromagnetic field distribution around the underwater ferromagnetic target, and performing underwater ferromagnetic target detection according to the power frequency electromagnetic field distribution. The present invention can enhance power frequency electromagnetic field signals of an underwater ferromagnetic target, and achieves underwater ferromagnetic target detection.

Disclosed are an underwater ferromagnetic target detection method and system employing multiple power frequency radiation sources, pertaining to the technical field of non-acoustic underwater detection. The method includes: a power transmission network generating a power frequency electromagnetic field in a spatial range, and an underwater ferromagnetic target generating an electromagnetic field under the combined action of the power frequency electromagnetic field and seawater inside and outside the underwater ferromagnetic target; if there are multiple ships on the water serving as secondary radiation sources acting on the underwater ferromagnetic target, obtaining a secondary magnetic field generated by the underwater ferromagnetic target, and adding the secondary magnetic field and the electromagnetic field generated by the underwater ferromagnetic target under the combined action of the power frequency electromagnetic field and the seawater inside and outside the underwater ferromagnetic target to obtain a total electromagnetic field generated by the underwater ferromagnetic target; and acquiring a power frequency electromagnetic field distribution around the underwater ferromagnetic target, and performing underwater ferromagnetic target detection according to the power frequency electromagnetic field distribution. The present invention can enhance power frequency electromagnetic field signals of an underwater ferromagnetic target, and achieves underwater ferromagnetic target detection.

An electromagnetic receiver system with an EM receiver coil is for measuring EM signals while transported by a vehicle, e.g. a helicopter. A base part serves for connection to a towing system. A coil support is fixed to the electrical conductor of the EM receiver coil. A suspension system has gimbal axles defining gimbal axes arranged in one plane. The gimbal axles are arranged within a periphery of the EM receiver coil. A central element is connected to the gimbal axles, such that the axes intersect in an EM receiver coil central part. Joints allow the receiver coil to pivot around the first and second axes. Springs provide a self-righting effect on the coil around the axes. A precise calibration of centre of mass of the suspended receiver coil can be obtained by adding masses to cause the centre of mass to coincide with the geometric intersection between the axes.

An electromagnetic receiver system with an EM receiver coil is for measuring EM signals while transported by a vehicle, e.g. a helicopter. A base part serves for connection to a towing system. A coil support is fixed to the electrical conductor of the EM receiver coil. A suspension system has gimbal axles defining gimbal axes arranged in one plane. The gimbal axles are arranged within a periphery of the EM receiver coil. A central element is connected to the gimbal axles, such that the axes intersect in an EM receiver coil central part. Joints allow the receiver coil to pivot around the first and second axes. Springs provide a self-righting effect on the coil around the axes. A precise calibration of centre of mass of the suspended receiver coil can be obtained by adding masses to cause the centre of mass to coincide with the geometric intersection between the axes.

A method includes receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers, the samples of a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and an object; determining, using the received data, a polarizability index of the object, the polarizability index characterizing a magnetic polarizability property of the object; classifying, using the determined polarizability index, the object as threat or non-threat; and providing the classification. Related apparatus, systems, techniques, and articles are also described.