Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-07-13
1990-08-14
Tokar, Michael J.
Communications: electrical
Condition responsive indicating system
Specific condition
340556, G01T 116
Patent
active
049490753
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a portable optical alarm system for area protection containing at least one transmitter emitting a light beam and a receiver sensing the emitted light, as well as a driving stage connected to the output of one of the receiver. The alarm system for area protection can be preferably used everywhere, where a protecting-alarming system is to be established for the sake of property protection or for safety technical reasons in a very short time, with a periodical character or under frequently changing circumstances and unobserved.
BACKGROUND OF THE INVENTION
In practice a plurality of optical alarm systems for area protection have been known and used, the common characteristic of which lies in that in the majority of the cases infrared light is used in the established light barriers. Said light barriers radiate modulated or unmodulated light in a continuous mode of operation, accordingly, transmitters and receivers of the light barriers require power of such a magnitude, which cannot be supplied economically either from a battery. For this reason the required number of transmitters and receivers of the light barriers are arranged in a stationary way, simultaneously power is provided for, representing--as widely known--the weak point of the protection systems.
Due to the aforemention features known optical alarm systems for area protection are not at all suitable for a changeable settlement or as portable embodiments, not in the least degree for battery operation, although there is an ever increasing demand in this respect.
SUMMARY OF THE INVENTION
The aim of the invention is to develop a portable optical alarm system for area protection, by the aid of which partly the deficiencies of known protection systems can be eliminated, partly it becomes possible to protect an area of optional magnitude, shape and extension fully automatized without any observance of the system; a further requirement lies in that neither settlement nor disassembly, translocation should require special expertness, expenditure on material and live labour, energy supply should not require the laying of cables.
A further aim of the invention lies in that the system should give an alarm signal in case of voltage dropout or in case of any intervention of sabotage character; it is also required that the driving stage having been connected to the last receiver of the system should be able to actuate any optional intervening organ and to perform remote actuation.
The invention is based on the recognition in so far as energy consumption of the known optical alarm systems for area protection is not exclusively determined by the electronic components applied in the transmitting and receiving circuits, respectively, but the complexity of circuits is playing a significant role in consumption; further factors influencing consumption are the number of independent circuits for performing the most diverse functions, energy distribution of the radiated light output as well as energy requirement of the actuation of the intervening organ connected to the system. Accordingly, the task lies in to develop a transmitting circuit and a receiving circuit, which are able to perform the functions needed with a low number of elements, by using circuit arrangements with a combined function and so, that dissipated loss output could be kept permanently on the possibly lowest value; a further requirement lies in that the emitted light pulses resp. output pulses should not appear in form of sudden and considerable capacities in the supply of the circuits.
The task set was solved by the aid of an optical alarm system for area protection which contains at least one transmitter emitting a light beam and a receiver sensing the emitted light, furtheron it is provided with a driving stage connected to the output of one of the receivers. Said arrangement is developed in so far as each transmitter and receiver are arranged in a casing containing the pulse-mode transmitter or receiver circuit with a battery and the output of e
REFERENCES:
patent: 3742222 (1973-06-01), Endl
patent: 4186388 (1980-01-01), Robinson
patent: 4250498 (1981-02-01), Walter
patent: 4314239 (1982-02-01), Odone
Hakkel Peter
Kurti Laszlo
Toth Gyula
Vasziljevics Gyozo
Komplex Kulkereskedelmi Vallalat
Magyar Optikai Muvek
Tokar Michael J.
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