Thunder alarm

Details Thunder alarm Thunder alarm

1991-11-27

1994-03-22

Coles, Sr., Edward L.

Communications: electrical

Condition responsive indicating system

Specific condition

340602, 7317024, 324 72, 324457, G08B 2100

Patent

active

052968421

ABSTRACT:
The apparatus which predicts the onset of thunderstorm and the occurrence of close thunderbolts, includes a composite sensor with several metal pipes radially installed with equal separation on a hemispherical electrode. A plurality of corona needles are provided on the insulator at the end of each metal pipes, and the needles are electrically connected together within the composite sensor. The hemispherical electrode is connected to a circuit that counts the number of electric field-changes for certain time intervals. In case the receiving frequency exceeds the pre-determined level, it issues a first alarm. The groups of corona needles are connected to the circuit that measures the corona current, and issues a second alarm, in case the current a pre-determined level. In addition, the circuit includes circuitry that picks up the large amplitude corona current changes that the polarity change and issues the thunderbolt warning.
The apparatus thus has the ability to issue three different types of alarms to indicate, first that thunderclouds are approaching from a distance, second that thunderclouds are coming closer or are developing overhead, and finally that thunderbolts are approaching very close.

REFERENCES:
patent: 3611365 (1971-10-01), Lundquist et al.
patent: 3753117 (1973-08-01), Downing et al.
patent: 3991367 (1976-11-01), Chapman et al.
patent: 4095221 (1978-06-01), Slocum, Jr.
patent: 4198599 (1980-04-01), Krider et al.
patent: 4594543 (1986-06-01), Eriksson et al.
patent: 4806851 (1989-02-01), Krider et al.
patent: 4901564 (1990-02-01), Williams et al.

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