Abstract: The invention relates to a device for detecting icing and de-icing of a wind turbine blade, characterized in that it comprises: a sensor, placed on the surface of a blade, and comprising a first so-called “receiving” antenna, a second so-called “emitting” antenna, and a frequency divider inserted between said first and second antennas; and an interrogator, configured to emit an electromagnetic wave towards the receiving antenna of said sensor, and to receive an electromagnetic wave from the emitting antenna of said sensor.

Abstract: The invention relates to a device for detecting icing and de-icing of a wind turbine blade, characterized in that it comprises: a sensor, placed on the surface of a blade, and comprising a first so-called “receiving” antenna, a second so-called “emitting” antenna, and a frequency divider inserted between said first and second antennas; and an interrogator, configured to emit an electromagnetic wave towards the receiving antenna of said sensor, and to receive an electromagnetic wave from the emitting antenna of said sensor.

Abstract: A method for monitoring a civil engineering construction including a first metal reinforcement and a reference conductor element. The first metal reinforcement and the reference conductor being separated by dielectric material and each having a first end that is electrically accessible. The method including injecting an incident electrical signal which is applied differentially between the first ends of the first reinforcement and of the reference conductor element collecting reflected signals returning along the conductors in return, and analyzing the reflected signals by comparing them against reference signals in order to determine any potential structural defect in the first reinforcement.

Abstract: A method of detecting a defect in a weld joining a first surface of a polyethylene-based material and a second surface of a polyethylene-based material, said method comprising the steps of: positioning a first electrode and a second electrode in proximity to the weld, so that at least one electric field line passes through said weld when a potential difference is applied between said first and second electrodes, measuring an electrical capacitance at a measurement frequency between said first electrode and said second electrode, the measurement frequency being higher than 65 MHz and lower than 1 GHz in order to compare the measured electrical capacitance to a reference value.

Abstract: Method for monitoring a civil engineering construction, comprising a first metal reinforcement (1) contributing to the mechanical strength of said construction, and a reference conductor element (2), these being separated by dielectric material (3) and each having a first end (11, 21) that is electrically accessible, the method comprising: A—injecting an incident electrical signal which is applied differentially between the first ends of the first reinforcement (1) and of the reference conductor element (2), B—collecting reflected signals returning along the conductors in return, C—analysing the reflected signals and comparing them against reference signals in order therefrom to deduce any potential structural defect (9) in the first reinforcement.

Abstract: An active device (10) for viewing a scene, includes a light source (12) suitable for emitting electromagnetic radiation towards the scene to be viewed. The device (10) also includes a detector (14), and is configured to activate the detector so as to measure at least a portion of the electromagnetic radiation emitted by the light source and returned by the scene viewed. The electromagnetic radiation emitted by the light source (12) is infrared radiation at least partially included within a spectral band, referred to as the “viewing band”, the wavelengths of which are between 8 micrometers and 15 micrometers, and the detector (14) is designed to measure infrared radiation within the viewing band. Such an active viewing device (10) is particularly suited to viewing in foggy or rainy weather. A viewing method is also described.

Abstract: A sensor for remotely detecting an object, the sensor comprising: a light source having a coherence length that is short relative to the distance between the sensor and the object; a splitter splitting the emitted light beam into an incident beam and a reference beam; a photorefractive crystal recording a hologram on interfering reception of the reference beam and of the reflected beam reflected by an object illuminated by the incident beam, and playing back the hologram in a diffracted beam that is re-emitted by the crystal by anisotropic diffraction under the effect of the reference beam; a detector recording information on receiving the diffracted beam; and a polarizing filter that eliminates the major fraction of the reflected beam as transmitted by the crystal on receiving the reflected beam; such that the detector receives only the diffracted beam from the crystal. Both the sensor and imaging systems incorporating the sensor enable measurements to be made through diffusing media.