Ultrasonic detecting means
First Claim
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1. IN A SYSTEM FOR DETECTING THE ABSENCE OF MOVEMENT OF AN ULTRASONIC ENERGY REFLECTING BODY WITHIN A PREDETERMINED PERIOD COMPRISING:
- AN ULTRASONIC TRANSMITTER FOR TRANSMITTING A BEAM OF ENERGY TOWARD SAID BODY;
AN ULTRASONIC DOPPLER RECEIVER INCLUDING A TRANSDUCER FOR RECEIVING ENERGY REFLECTED FROM SAID BODY;
ALARM MEANS FOR INDICATING THE FAILURE OF SAID RECEIVER TO RECEIVING A DOPPLER SIGNAL FROM SAID BODY WITHIN SAID PREDETERMINED PERIOD;
AND RESETTABLE TIME-OUT MEANS CONNECTED BETWEEN SAID RECEIVER AND SAID ALARM MEANS AND INCLUDING MEANS FOR ACTUATING SAID ALARM MEANS WHEN NO DOPPLER SIGNAL IS RECEIVED WITHIN SAID PREDETERMINED PERIOD.
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1 Claim
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1. IN A SYSTEM FOR DETECTING THE ABSENCE OF MOVEMENT OF AN ULTRASONIC ENERGY REFLECTING BODY WITHIN A PREDETERMINED PERIOD COMPRISING:
- AN ULTRASONIC TRANSMITTER FOR TRANSMITTING A BEAM OF ENERGY TOWARD SAID BODY;
AN ULTRASONIC DOPPLER RECEIVER INCLUDING A TRANSDUCER FOR RECEIVING ENERGY REFLECTED FROM SAID BODY;
ALARM MEANS FOR INDICATING THE FAILURE OF SAID RECEIVER TO RECEIVING A DOPPLER SIGNAL FROM SAID BODY WITHIN SAID PREDETERMINED PERIOD;
AND RESETTABLE TIME-OUT MEANS CONNECTED BETWEEN SAID RECEIVER AND SAID ALARM MEANS AND INCLUDING MEANS FOR ACTUATING SAID ALARM MEANS WHEN NO DOPPLER SIGNAL IS RECEIVED WITHIN SAID PREDETERMINED PERIOD.
- AN ULTRASONIC TRANSMITTER FOR TRANSMITTING A BEAM OF ENERGY TOWARD SAID BODY;
Specification