منابع مشابه
An electronic phonocardiograph employing a double-beam cathode-ray oscillograph as the recording device.
A phonocardiograph employing a cathode-ray tube is the theoretical ideal since the natural frequency of the instrument is sufficiently high to avoid distortion of the vibrations to be recorded, the amplitude of the deflections is directly proportional to the movements which excite them, and the cathode-ray beam has minimal inertia and is fully damped. With any of the popular recording devices i...
متن کاملA Study of the Action Currents of Nerve with the Cathode Ray Oscillograph
The instruments which have been used heretofore for the observation of nerve action currents have been galvanometers of the moving coil or magnet type with or without the aid of a rheotome, the capillary electrometer and the string galvanometer. Each of these instruments possesses considerable inertia. The slower galvanometers are unaffected by single action currents and give a sustained deflec...
متن کاملThe value of high fidelity electrocardiography using the cathode ray oscillograph and an expanded time scale.
The cathode ray is practically free from inertia and therefore an ideal instrumentality for studying variations in electrical potential. A cathode ray oscilloscope with an amplifier system of high frequency response and an expanded time scale, 330 mm. per second, were employed to record electrocardiograms. Such tracings revealed considerable notching, slurring, and other peculiarities not seen ...
متن کاملDigital Oscillograph
Design Introduction The digital storage oscillograph uses a microprocessor for control and data proccesing. It performs a variety of functions that simulation oscillographs cannot, such as leading triggering, combined triggering, burr capture, wave processing, hard-copy export, soft-disk recording, and long-term waveform storage. Typically, the digital storage oscillograph’s bandwidth exceeds 1...
متن کاملA multi-channel cathode-ray phonocardiograph.
The difficulties of recording the faint murmurs of early rheumatic valvulitis are well known, and for this reason it was considered advisable to develop a cathode-ray phonocardiograph. This is theoretically the ideal recording device owing to its minimal inertia and high sensitivity. This phonocardiograph is intended to provide objective confirmation of clinical findings on auscultation, record...
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ژورنال
عنوان ژورنال: Journal of the Optical Society of America
سال: 1922
ISSN: 0030-3941
DOI: 10.1364/josa.6.000701