摘要:
II s'agit de détecter la rupture d'un fusible 1. On applique une tension continue U fonction de la tension prélevée aux bornes du fusible entre une électrode fixe 3 et une électrode mobile 4 formant ensemble un condensateur. L'électrode 4 est sollicitée vers l'électrode 3 par un électret 5 solidaire de cette dernière et dans le sens contraire par un aimant 6 et par la tension U : dès que cette tension dépasse un seuil correspondant à la rupture du fusible, l'électrode bascule et ferme un interrupteur 9 à des fins d'alarme. Applications courantes.
摘要:
The invention relates to a local radio communication system comprising a central controller (9), several bases (7) which are connected to the controller and several terminals (5) which communicate with the bases. The bases (7) communicate with the terminals using a local radio communication protocol with time division multiple access. Said bases are adapted to real-time transmit chronological information to the controller relating to the transmissions planned for said bases. The controller is adapted to determine if there is a risk of interferences occurring between the planned transmissions and to impose a chronology for said planned transmissions on the bases in order to limit said interferences.
摘要:
The invention concerns a public display panel comprising an external casing (2) with at least one transparent opening (3), a support stripe (4) made of flexible material bearing juxtaposed posters, and a driving mechanism (6) for selectively displaying said posters opposite the transparent opening. Said display panel further comprises an electronic interface adapted to receive data representing new posters to be printed on the support stripe, an electronic central unit communicating with the interface, a printer (9) controlled by said central unit for printing new posters on the support stripe.
摘要:
The invention concerns a public display panel comprising an external casing (2) with at least one transparent opening (3), a support stripe (4) made of flexible material bearing juxtaposed posters, and a driving mechanism (6) for selectively displaying said posters opposite the transparent opening. Said display panel further comprises an electronic interface adapted to receive data representing new posters to be printed on the support stripe, an electronic central unit communicating with the interface, a printer (9) controlled by said central unit for printing new posters on the support stripe.
摘要:
A portable one-way radio pager comprising receiving means (4, 5, 6) for receiving radio messages, a memory (8) for storing the messages, a screen (2), a keypad (3), an electronic CPU (7) and a speaker (9). The CPU is designed to recognise specific messages known as "primary certification codes" and cause the speaker to output an encoded sound signal depending on a secondary code entered by the user using the keypad and an additional code accessible to the CPU. The encoded sound signal enables user identification.
摘要:
Il s'agit d'un procédé pour optimiser la communication radio entre une base fixe (1) à plusieurs antennes (2) et un mobile (5), en traitant dans la base fixe tout signal S i (t) reçu ou émis par chaque antenne de façon à déterminer un signal corrigé S i (t) = h i (-t)⊗S i (t), h i (-t) étant une approximation de l'inversion temporelle de la réponse impulsionnelle h i (t) entre cette antenne et le mobile.
摘要:
Fire detection device (1) comprising a fire sensor which measures a first physical quantity and generates a measuring signal, the latter being affected by a second physical quantity which is different from the first. The device also includes a correction sensor (4) for measuring the second physical quantity and generating a correction signal. The fire sensor and the correction sensor are connected to a microprocessor (2) in which is stored a curve representing a normal operating value i0 of the measuring signal based on the value of the correction signal in the absence of a fire. The microprocessor is programmed to calculate i0 based on the correction signal and to determine the presence of a fire when the mesuring signal is not included in the range of values determined about i0.
摘要:
Fire detector (1) comprising a central processing unit (2) and a sensor (3) that supplies said unit with an analog measurement signal. The processor includes a non-volatile memory (2a) containing at least one normal measuring signal value and maintenance dates, the fire detector also comprising an interface (5, 6) for accessing the contents of the non-volatile memory accessible without having to remove the fire detector. After each maintenance, a new maintenance date is recorded in the non-volatile memory. No recording is made, however, if the measuring signal differs substantially from its normal value.
摘要:
The speed of a moving object (1) relative to the ground (2) may be measured with a wide beam Doppler radar (3) on board the moving object by transmitting two closely spaced incident radar waves at the ground and collecting the corresponding reflected waves, at least the first incident wave having a frequency that is variable over time, multiplying signals representing the first incident and reflected waves, determining a spectrum of the low frequency component of the product of the two signals, processing the second incident and reflected waves in the same way, then finding two peaks on said spectra that match with a certain frequency shift, and determining the speed of the moving object from the frequencies of these two significant points and the height of the radar above the ground.