摘要:
The device comprises means for applying a DC voltage U as a function of the voltage taken from the terminals of a fuse between a fixed electrode and a movable electrode forming together a capacitor. The movable electrode is urged towards the fixed electrode by an electret fast to the latter and in the opposite direction by a magnet and by the voltage U. As soon as this voltage exceeds a threshold corresponding to the rupture of the fuse, the movable electrode swings over and closes a switch for warning purposes.
摘要:
The device is able to detect the exceeding of a given threshold by a parameter, other than an electric voltage, capable of affecting the electrostatic force of attraction exerted between a charged electret and one, of two electrodes between which said electret is placed, said parameter being for instance an ionizing radiation. The two electrodes are at the same electric potential and the device also comprises return means for urging the first electrode and the electret permanently apart, and means for using the relative displacement of said elements, when it occurs, for desired detection purposes.
摘要:
A device for detecting the presence of an automatic defibrillator. The device comprises a detector, a communications device and an activation device. The detector detects the presence of an automatic defibrillator in its operation position and to defibrillator relating to the automatic defibrillator. The communications device is configured to transmit he e data of the automatic defibrillator to a management device. The activation device is configured to activate at least one of the communication device and the detector in response to a pre-determined event.
摘要:
To authenticate images taken by image capturing elements (3) of offending vehicles, for example, when exceeding the authorized speed, provided elements are provided for allowing informative data on the offence to be supplied, such as the speed of the vehicle, the date, the time and the place of the offence and various processing methods are provided which enable, during exploitation of the images, detection of whether or not manipulations have been carried out on the images.
摘要:
After emission of an acoustic pulse, having a first duration, from a given location, acoustic signals coming from the location are gathered through a multi-scattering medium on an array of transducers and recorded, for a second duration greater by at least one order of magnitude than the first duration. Return signals obtained by temporal inversion and amplification of the signals gathered during the second duration are emitted back from said transducers toward the multiscattering medium in order to focus acoustic energy to the location while providing temporal compression of the focussed acoustic energy.
摘要:
A reader identifies coded electronic badges without contact with the latter, by simple inductive coupling of inductances, the electrical supply of the badge being ensured from a voltage at high frequency F generated by the reader. The code of the badge, composed of a sequence of bits following one another at a frequency f very much less than F, is used to modulate a voltage of intermediate frequency fi comprised between f and F and the thus modulated voltage controls an electronic switch adapted to short-circuit a resonant circuit of the badge.
摘要:
In a coded locking device, unlocking of which is controlled by composing any one of two separate codes, namely a code in use known by entitled users and a responsible person or "first code x" and a secret code or "second code y", able to be derived from the first code x by a particular law known only to the responsible person, the first composition of the second code y automatically ensures unlocking of the device and, in a way sufficiently postponed for the users to become acquainted with it, the three following operations: invalidation of the first code x, adoption by the device of the second code y as new first code, sensitization of the device to a third code z derived from the preceding second code y by the above low, this third code z serving as the new second code.
摘要:
The invention relates to a device for reading the quantities of electrical charges borne by a dielectric sheet using a probe scanning the charged surface of the sheet and connected to an electronic circuit adapted to measure the quantities of charges induced on said probe. This electronic circuit comprises an operational transimpedance amplifier and an analog integrator reset to zero periodically by suitable circuitry.
摘要:
The invention provides a device for measuring ionizing radiations, comprising a Geiger-Muller tube (1) whose high supply voltage is obtained from pulses which are emitted (by 6,7) at a constant relatively low frequency as long as a predetermined threshold is not exceeded by the intensity of the radiation and (by 6,7,4 and 32) at an increasing frequency depending on the output of the tube, after said threshold has been exceeded. Thus, alarm dosimeters having very long independent operation may be formed.
摘要:
The invention relates to a device for measuring irradiation capable of modifying the charge of an electret. It is arranged in a portable cassette, between two electrodes held separated by a part and connected to a measuring circuit. A conductive shutter is movable parallel to itself and to the electret between this electret and than electrode, so as to alternately mask this electret with respect to this electrode and to render the electret visible to the electrode. The measurement exploits differences in charge of the electret read according to the movements of the shutter.