SENDING THE PULSE BY RADIO.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The biocurrents of the heart and the pulse in the finger tips are simultaneously transmitted by radio and recorded by radio-sphygmotachocardiograph. Liquid electrode-sucking-disks are used to pick up the biocurrents of the heart. Semiconductor photoresistors placed on the finger tips are used to record the filling of the fingers by blood. A miniature lamp illuminates the fingers from the opposite side. The translucence of the fingers changes as the vessels are filled with blood, thus changing the illumination on the photoresistors and their electrical characteristics. Frequency modulation and two separate amplifiers are used to ensure that the instrument operates stably. The transmitter is fed from a battery of seven cells, each of which is no bigger than a hazel nut. The instrument of the investigator consists of a receiver similar to an automobile receiver, a decoder and an automatic writing device. The time of propagation of a pulse wave is calculated with an accuracy up to 1100 of a second.
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