Telephonic communications – Emergency or alarm communications – Responsive to sensed nonsystem condition
Patent
1984-11-02
1987-12-08
Rowland, James L.
Telephonic communications
Emergency or alarm communications
Responsive to sensed nonsystem condition
340533, 340600, 379106, G08B 1712
Patent
active
047120975
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to measurement of a radioactive concentration and, more particularly, to an automatic measuring/alarm apparatus for measuring a radioactive concentration from a remote location using a telephone circuit.
BACKGROUND ART
A commercially available Geiger counter as a radioactive measuring instrument can be carried by an unskilled person. If he wishes to use the Geiger counter, he turns on a power switch of the counter. The person can discriminate a radioactive concentration in accordance with click sounds and a reading of the meter.
However, it is very dangerous and inconvenient for an unskilled person to enter into a specific area subjected to a radioactive leakage and to measure a radioactive concentration by carrying the Geiger counter.
DISCLOSURE OF THE INVENTION
It is a first object of the present invention to provide an automatic measuring/alarm apparatus for measuring a radioactive concentration or the like, wherein a Geiger counter is built into a predetermined position inside the apparatus so as to detect abnormality such as radioactive contamination from a remote location using a telephone circuit.
It is a second object of the present invention to provide an automatic measuring/alarm apparatus for measuring a radioactive concentration or the like, wherein the Geiger counter is rendered operative for every predetermined interval, and an automatic dial device is operated to transmit an owner of the apparatus at a remote location when a radioactive concentration exceeds a predetermined value.
It is a third object of the present invention to provide an automatic measuring/alarm apparatus for measuring a radioactive concentration, wherein sounds generated by the Geiger counter are automatically recorded after abnormality such as radioactive contamination is detected.
It is a fourth object of the present invention to provide an automatic measuring/alarm apparatus for measuring a radioactive concentration or the like, wherein the sounds from the Geiger counter and sounds recorded by a recording device are transmitted from a remote location through the telephone line.
In order to achieve the above objects of the present invention, there is provided an automatic measuring/alarm apparatus for measuring a radioactive concentration or the like, comprising a measuring device such as a Geiger counter for measuring a radioactive concentration, a preset counter for counting pulse sounds from the measuring device and generating an output when a count thereof exceeds a predetermined value, and timer means for resetting the preset counter for every predetermined time interval, wherein a telephone line is engaged upon detection of an output from the preset counter, that is, upon detection of abnormality, and at the same time an automatic dial device is operated, so that an owner of the apparatus is called through the telephone line, an off-hook operation of an owner is detected by a detector, an output from the detector operates alarm generating means, and an alarm sound from the alarm generating means is sent onto the telephone line.
The measuring/alarm apparatus according to the present invention further has a recording device. After the alarm is sent ot the owner in response to the abnormal detection signal from the preset counter, pulse sounds from the measuring device are recorded in the recording device for every predetermined time interval. When the owner sends a first remote control signal by calling the measuring/alarm appartus through the telephone line, the measuring/alarm appartus causes the recording device to rewind and reproduce a recorded tape, thereby sending information recorded on the tape to the owner. Therefore, the owner can hear the pulse sound from the remote area. When the owner sends a second remote control signal to the measuring/alarm apparatus, the pulse sound from the apparatus can be heard by the owner at the remote location.
Since the apparatus has the arrangement described above according to the present invention, measuring devices for
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patent: 3536839 (1970-10-01), Prins
patent: 3617640 (1971-11-01), Cichanowicz
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patent: 3787624 (1974-01-01), Spitalny et al.
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Hofsass Jeffery A.
Rowland James L.
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