Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-08-23
1990-02-27
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
H04B 900
Patent
active
049053094
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a system for remote-control of an electric device by optical means.
Systems are already known for transmitting by optical means information signals between an emitter and a receiver each provided with a source of electrical supply. Systems are also known in which a signal is transmitted by optical means between an emitter, provided with a source of electrical supply and a receiver, bereft of a local source of electrical supply, the signal itself containing the energy necessary for exploitation thereof by the receiver. However, in this latter case, the energy transmitted by said signal is weak and allows only the execution of a simple function of the receiver, such as a triggering.
The present invention has for its object a system of the type mentioned above, in which the receiver, although bereft of a local source of electrical supply or provided with an exhaustible local electrical source, allows a continuous complex exploitation cf the electrical information signal transmitted optically by the emitter. Although of general application, this system according to the invention is particularly appropriate for operating, controlling or monitoring an electric apparatus disposed in part of an aircraft not provided with an electrical source. Such an apparatus may for example be a sensor, a servo-valve, a display screen or the like. The present invention is also particularly interesting to carry out for controlling the ringing of telephone sets of optical networks.
To that end, according to the invention, the system for remote-control of an electric device and comprising, on the one hand, an emission device provided with a source of electrical supply, a generator generating electrical information intended for controlling said electric device and a first electro-optical converter for converting said electrical information into optical information and, on the other hand, a reception device provided with a first opto-electrical converter capable of reconverting said optical information into electrical information in order to control said electric device, the emission device and the reception device being connected by optical channel is noteworthy in that: converting the electrical energy of the supply source into optical energy; and
a second opto-electrical converter connected to said second electro-optical converter by said optical channel and capable of reconverting the optical energy into electrical energy; and
an accumulator of electrical energy capable of storing the electrical energy delivered by said second opto-electrical converter and of supplying electrical energy, at least partially, to the electric device.
Thus, thanks to the system according to the invention, not only the electrical information controlling the electric device but also the electrical power indispensable for the operation of the latter, issue from the emission device and are transmitted via the optical channel.
The second electro-optical converter of the emission device may be of thermal type. However, it is preferable if it is constituted by a laser diode.
For certain applications, the solar radiation picked up at the emission device may directly ensure supply of optical energy to the reception device.
The second opto-electrical converter of the reception device is advantageously of the photovoltaic photodiode type, naturally adapted to the second electro-optical converter. In order to be able to obtain at the output of said opto-electrical converter a voltage (for example of the order of 5 V) sufficient for operation of the electronics of the reception device, it is advantageous if the second opto-electrical converter is formed by the assembly in series of a plurality of photodiodes operating in photovoltaic mode.
The arrangement of the photodiodes and the electrical assembly adopted are obviously a function, respectively, of the spatial distribution of the radiation received, as well as of the desired level and sign of the voltage.
The energy accumulator of the reception device may be a capacitor (associ
REFERENCES:
patent: 4402090 (1983-08-01), Gfeller
patent: 4434510 (1984-02-01), Lemelson
Domergue Jean-Paul
Lacan Francis
Maisonneuve Jean-Michel
Aerospatiale - Societe Nationale Industrielle
Beek L. Van
Griffin Robert L.
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