Abstract: An accelerometer based on monocrystalline silicon. A moving mass is connected to a fixed frame by suspension arms. The sensor is produced in the stack of two silicon wafers in which stop and counter-stop functions are produced so as to limit the amplitude of the movements of the moving mass.

Abstract: The present invention relates to a process for compensating the magnetic disturbances influencing the measurements of a device for determining the magnetic heading, mounted on a land vehicle or aircraft, comprising a magnetometer furnishing analog voltages proportional to the components of the disturbed magnetic field of the earth along its reference axes. It is admitted that the locus of the end of the vector indicative of the field is an ellipse for a land vehicle and an ellipsoid for an aircraft, of which identification from the analog voltages and transformation into a circle or sphere centered at O, origin of the axes of the magnetometer, enable correction coefficients to be calculated which are introduced into the memory of a computer unit associated with the magnetometer in order to define at any instant a vector making with a reference axis of the magnetometer an angle corresponding to the real magnetic heading of the vehicle or of the aircraft.

Abstract: A device for producing at the output of a multivibrator an electric signal the period of which is a linear function of a temperature to which is subjected the measuring probe, characterized in that said multivibrator consists in a comparator whose first input comprises the probe, said probe consists in at least two semi-conducting junctions connected two by two in parallel and in opposite directions, and the other components of the device, particularly those of the second comparator input comprising a capacitor, remains invariable.

Abstract: Device for measuring the volumetric flow rate of a fluid flowing through a generally tubular body, wherein a swirling motion is imparted to the fluid by a precessing means, comprising a device producing a variable frequency signal depending on the precession motion of the fluid, associated with a logical means arranged for correcting said frequency, characterized in that the precessing means comprises in succession, in the flowing direction of the fluid, a first cylindrical duct communicating with a converging cylindrical-conical axial chamber through a second duct the axis of which is displaced and inclined in relation to the axis of said chamber, the latter communicating co-axially with a cylindrical terminal duct through a third cylindrical duct of restricted diameter connected to said terminal duct by a diverging conical enlargement.