Phase-sensitive detector-type electromagnetic flowmeter

An improved 60 cycles/sec sine wave electromagnetic flowmeter has been developed. By special construction of the pickup cannula and phase-sensitive demodulation, the conventional “balancing” procedure has been eliminated. Thus the operational technique is simple, and the flowmeter does not need readjustment between use. Both forward and backward flows can be measured with less than 3% error. The frequency response as determined by the use of a suppressed carrier modulated signal was 0–30 cycles/ sec without loss. blood flow; 60 cycles/sec sine wave; suppressed carrier test Submitted on October 26, 1964

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Phase Sensitive Detector for Multi-electrode Electromagnetic Flowmeter

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) ◽

10.1109/i2mtc50364.2021.9459973 ◽

2021 ◽

Author(s):

Kai Gao ◽

Ziqiang Cui ◽

Zihan Xia ◽

Huaxiang Wang

Keyword(s):

Electromagnetic Flowmeter ◽

Sensitive Detector ◽

Phase Sensitive ◽

Phase Sensitive Detector

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Pattern of blood flow in the pulmonary veins of the dog

Journal of Applied Physiology ◽

10.1152/jappl.1965.20.6.1118 ◽

1965 ◽

Vol 20 (6) ◽

pp. 1118-1128 ◽

Cited By ~ 67

Author(s):

Eugene Morkin ◽

John A. Collins ◽

Harold S. Goldman ◽

Alfred P. Fishman

Keyword(s):

Blood Flow ◽

Pulmonary Circulation ◽

Pulmonary Veins ◽

Electromagnetic Flowmeter ◽

Sine Wave ◽

Left Ventricular ◽

Mean Flow ◽

Venous Flow ◽

Pulmonary Venous Flow ◽

Atrial Contraction

The pattern of blood flow in the large pulmonary veins was studied in dogs by chronic implantation of sine-wave electromagnetic flowmeters and cineangiographic observations. These revealed that: 1) pulmonary venous flow is continuous and pulsatile with peak rate of flow of approximately twice the mean flow; 2) the initial rapid increase in venous flow occurs 0.10 sec after the onset of ventricular systole, reaching a peak at the time of closure of the A-V valves; 3) left atrial contraction produces a fleeting slowing or reversal of flow; and 4) respiratory variations in pulmonary venous flow follow those in pulmonary arterial flow, beat by beat. The genesis of phasic pulmonary venous flow was investigated by analysis of pressure and flow curves from the two sides of the heart, by consideration of the energy required for left ventricular filling, and by reconstruction of the pulmonary venous flow pulse using a mathematical model of the pulmonary circulation. These three lines of evidence are consistent in indicating that the transmitted right ventricular pressure is the major determinant of the pulmonary venous flow pattern in the dog. pulsatile pulmonary venous flow; pulmonary venous flow; pulmonary circulation; ventricular suction; respiration on pulmonary circulation; pulmonary venous angiography; pulmonary veno-atrial junctions; electromagnetic flowmeter; cineangiography Submitted on November 16, 1964

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