Abstract: A method for controlling the zoom of an image-capturing apparatus, noteworthy in that it includes a step in which a controlling device (11) sends a burst of successive zoom commands over a series link (13) of the image-capturing apparatus (12), the number of commands making up the burst being included between 5 and 120 and the time between two bursts being longer than 100 ms and in that it includes a step of arresting the zoom mechanism if the number of bursts has reached a first predetermined limit value.

Abstract: A method for tracking a moving object by a tracking device comprises the following steps: (a) reception by the tracking device of a signal transmitted by the moving object or objects and comprising a first item of information of the position of the moving object determined from information received from a satellite positioning system, (b) determination of a second item of information of the relative altitude of the moving object with respect to the tracking device, and the said second item of information is calculated on the basis of the atmospheric pressures measured at the altitude of the tracking device and on the moving object, (c) calculation of the relative position of the moving object with respect to the tracking means, from the first and second items of information using a data fusion technique, (d) orientation of the tracking means towards the relative position calculated in step (c).

Abstract: The invention relates to a method and an optical-fiber measuring device including a light source with a light power P, a Sagnac ring interferometer in which propagate two counter-propagating waves, a detector receiving a light flux from the interferometer and converting it into an electrical signal representing the total phase difference ??t between the counter-propagating waves. It also includes an electronic element receiving the electrical signal from the detector and providing a first signal S1 function of the measured parameter. The electronic element includes a demodulator contributing to provide the first signal function of the measured parameter and provide a second signal S2 function of the power P of the light flux measured by the detector. The optical phase modulator generates a disturbance component ??cp adding to the phase difference ??m=??b+??cr.

Abstract: The invention relates to a method and an optical-fibre measuring device including a light source with a light power P, a Sagnac ring interferometer in which propagate two counter-propagating waves, a detector receiving a light flux from the interferometer and converting it into an electrical signal representing the total phase difference ??t between the counter-propagating waves. It also includes an electronic element receiving the electrical signal from the detector and providing a first signal S1 function of the measured parameter. The electronic element includes a demodulator contributing to provide the first signal function of the measured parameter and provide a second signal S2 function of the power P of the light flux measured by the detector. The optical phase modulator generates a disturbance component ??cp adding to the phase difference ??m=??b+??cr.