Abstract: A stride monitoring device that can be used particularly for sports applications and that includes a pair of shoes, one of which includes at least one magnetic mass, and the other includes at least a measurement device to make at least one measurement, and a processor for processing of the measurement. The measurement device includes at least one accelerometer and at least one magnetometer capable of outputting signals that can be processed to determine stride parameters.

Abstract: A system for measuring a magnetic signature of a vehicle, including: at least a first set of sensors (Cxi) that are stationary and arranged along at least a first direction; at least a second set of sensors (Cyj) that are stationary and arranged along at least a second direction that intersects the first direction; a common sensor (Cxy0) arranged at a location where the first set of sensors and the second set of sensors intersect, said common sensor belonging to the first and the second sets of sensors, wherein the first set of sensors and the second set of sensors are arranged so that the vehicle passes above at least part of the sensors of the first and second set of sensors; and a calculation device for calculating a relation between a time signature So(t) of the vehicle passing above the common sensor and a spatial profile So(x) resulting from measurements made by the first set of sensors.

Abstract: Sports ball, and more generally a pneumatic object with at least one internal pressure sensor (10) of said ball, automatic inflator (6), capable of compensating for a decrease in the internal pressure, this inflator having at least one gas micro-generator, said at least one micro-generator being capable of being actuated when the pressure sensor (10) measures an internal pressure below a predetermined threshold.

Abstract: A set of sensors is placed on a form (a curve or a surface), wherein each sensor supplies representative signals of the orientation of the form at the position of this sensor; a model of the form is selected; based on the signals, the parameters of the model are determined and the distances which separate the sensors are measured; and, based on the parameters of the model and the distance measurements, the spatial distribution of the points of the form are determined.

Abstract: The main object of the present invention is a device for detecting a relative position of a first element (12, 14) having a main mechanical function and a second element, including an electric circuit (4) the opening and closing of which respectively correspond to a first and a second position of the first and second elements with respect to each other, wherein at least the first element is part of the electric circuit (4). An object of the present invention is also a monitoring installation comprising such detecting devices.

Abstract: Process and acquisition device of a deformable geometrical form. A set of sensors (1) is placed on this form (a curve or a surface), wherein each sensor supplies representative signals of the orientation of the form at the position of this sensor; a model of the form is selected; based on the signals, the parameters of the model are determined and the distances which separate the sensors are measured; and, based on the parameters of the model and the distance measurements, the spatial distribution of the points of the form are determined. The invention applies especially to the fields of machining, joinery, masonry work and construction work.

Abstract: Sports ball, and more generally a pneumatic object with at least one internal pressure sensor (10) of said ball, automatic inflator (6), capable of compensating for a decrease in the internal pressure, this inflator having at least one gas micro-generator, said at least one micro-generator being capable of being actuated when the pressure sensor (10) measures an internal pressure below a predetermined threshold.

Abstract: The invention relates to a device for measuring the magnetic signatures of vehicles including: at least a first set of sensors (Cxi), designed to be arranged along at least a first direction (2), at least a second set of sensors (Cyj), designed to be arranged along at least a second direction (4), that intersects the first direction at a point at which a common sensor (Cxy0) is placed, belonging to the first and the second set, calculation means to calculate a relation between the time signature So(t) of a vehicle passing above the common sensor and a spatial profile So(x) resulting from measurements made by the sensors in the first set of sensors.

Abstract: A stride monitoring device that can be used particularly for sports applications and that includes a pair of shoes, one of which includes at least one magnetic mass, and the other includes at least a measurement device to make at least one measurement, and a processor for processing of the measurement. The measurement device includes at least one accelerometer and at least one magnetometer capable of outputting signals that can be processed to determine stride parameters.

Abstract: A device for the detection of movement of a valuable object, for example in a museum in which a device for detecting at least a rotation of the object, and particularly magnetometers or inclinometers, are mechanically fixed to the object. These detecting devices are coupled to a message transmission device that sends a presence message as long as detection has not taken place and an alert type message when detection has taken place. A monitoring station processes these messages or the absence of these messages, to trigger an alert if necessary.

Abstract: Device for the detection of movement of a valuable object, for example in a museum in which means of detecting at least a rotation of the object, and particularly magnetometers or inclinometers, are mechanically fixed to the object. These means are coupled to message transmission means that send a presence message as long as detection has not taken place and an alert type message when detection has taken place. A monitoring station processes these messages or the absence of these messages, to trigger an alert if necessary.

Abstract: A process for determining the position of a moving object, by the following steps: scalar measurements are acquired by a set of sensors all installed on the same site, at a position known at each instant; the trajectory of the object is determined approximately by a model; the measurements output from each sensor are combined to obtain spatial gradient measurements representative of the vector electromagnetic disturbance of the moving object; a vector of parameters characteristic of the model is estimated as a function of gradient measurements and as a function of the position of the sensors; and the position of the object is determined as a function of the position of the sensors and the parameters vector.

Abstract: In a magnetic cartography process and apparatus, measurements are performed by magnetic field sensors placed in "fish" moved in the area to be mapped. Gradients are determined on the basis of the difference between the measurements supplied by two sensors at the same time, this applying to any pair of sensors, and/or on the basis of the difference between the measurements supplied by the same sensor at two different times, this applying to any sensor, which leads to at least one map of gradients which is broken down into a map of regional field gradients and a map of local field gradients. On the basis of the local field gradients, a determination takes place of the geological field relative to the area, or the gradients of the field and then the local field, by adding the geological field to the regional field determined on the basis of its gradients by an inversion and direct calculation method.

Abstract: A process for the extraction of a time-variable useful signal having a finite spatial extension by an array of N sensors or transducers (N being equal to or greater than 3), that receive the useful signal to which have been added q spatially coherent additive noises (q being less than N). According to the process, unprocessed signals are acquired on the output of each sensor, filtered in order to restrict them to the frequency band of the useful signal and digitized. Then, spatial prediction error signals of the noise are calculated and analyzed so as to carry out the detection of the useful signal and its separation from the q additive noises. A device for extracting a useful signal according to the process is also disclosed.

Abstract: The apparatus includes a pair of electrodes which makes it possible to channel a current density creating the current which induces a magnetic field in one or more induction coils. This magnetic field is measured with the aid of one or more magnetometric transducers. The electric/magnetic transfer rate of the coils and the conductivity of the conductive medium are known, so that the value of the electric field is deduced on the basis of Ohm's law. The local magnetic field is previously measured so as to take account thereof when measuring the induced magnetic field.

Abstract: Magnetic process for determining the trajectory of a moving vehicle for finding a fixed or moving magnetic object and apparatus for performing the process.The apparatus comprises magnetometers for measuring at least p independent components of the gradient of the local magnetic field, in which p is an integer equal to the number of dimensions of the space in which the moving vehicle is displaced, a circuit for storing a scalar criterion which is a function of at least one of the components of the measured gradient, a circuit for calculating the direction (.theta., .psi.) maximizing the criterion as a function of the measured gradient and a display, for use in guiding the vehicle.

Abstract: Apparatus for measuring the residual magnetization vector in cylindrical coordinates of a geological core sample. It comprises a carriage carrying a solenoid made to longitudinally vibrate for determining the longitudinal component of the vector and ferromagnetic transducers which determine the radial component and the phase of the radial component of the vector by rotating the core sample. The measurements are automatically integrated.

Abstract: This process produces a small toroidal winding used, for example, to make very stable, thin magnetic magnatometers. To produce a winding having turns which are perfectly radial with respect to a cylinder, use is made of an internal cylinder and an external cylinder provided with slots arranged along the generatrixes of these cylinders. Hairpin-shaped conductive wires are introduced into these slots and welded to one another.