Abstract: In order to characterize electrically conducting and/or ferromagnetic objects, such as rebars, in concrete, a device is rolled along a surface of the sample. The device comprises e.g. two rows (10.1, 10.2) of partially overlapping sending coils (6) and receiving coils (7). Each pair of attributed sending and receiving coils (6, 7) is designed to have reduced mutual impedance in the absence of any electrically conducting and/or ferromagnetic object. The complex value, e.g. the phase and absolute value, of the mutual impedances are measured in order to determine a number of parameters (size, position and coverage of the object with concrete) of the objects.

Abstract: A method for photon counting imaging with improved high-rate counting performance includes the step of applying an instant retrigger capability with adjustable dead time in cells of the detector array and operates an apparatus using a layer of photosensitive material, an L×K array of photodetector elements arranged in the layer of the photosensitive material, an N×M array of readout unit cells, including amplifying elements and at least one readout unit cells for at least one photodetector elements. The readout unit cells are controlled by signal processing elements with each readout unit cell having internal signal processing elements to generate a discriminator output signal representing an amplified signal of the electron-hole pairs generated by an incident photon or a number of incident photons in the respective photodetector element.

Abstract: A method for photon counting imaging with improved high-rate counting performance includes the step of applying an instant retrigger capability with adjustable dead time in cells of the detector array and operates an apparatus using a layer of photo-sensitive material, an L×K array of photodetector elements arranged in the layer of the photosensitive material, an N×M array of readout unit cells, including amplifying elements and at least one readout unit cells for at least one photodetector elements. The readout unit cells are controlled by signal processing elements with each readout unit cell having internal signal processing elements to generate a discriminator output signal representing an amplified signal of the electron-hole pairs generated by an incident photon or a number of incident photons in the respective photodetector element.