Results 191 to 200 of about 1,922,963 (250)
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The Journal of the Acoustical Society of America, 1984
The invention concerns a method and apparatus for detecting Doppler-shifted waveforms in electrical signals. A replica is derived from the waveform prior to Doppler shift and stored in a storage device as a non-uniform profile having progressively increasing distortion along its length.
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The invention concerns a method and apparatus for detecting Doppler-shifted waveforms in electrical signals. A replica is derived from the waveform prior to Doppler shift and stored in a storage device as a non-uniform profile having progressively increasing distortion along its length.
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Pulsed doppler echocardiography: Principles and applications
The American Journal of Medicine, 1977A new recording and display system is described for use with pulsed Doppler blood flow velocity detectors in the diagnosis of valvular and septal defects. The principles of the pulsed Doppler device are described along with the methods used to analyze and display the Doppler shifted signal from flow jets resulting from various valve defects.
D W, Baker, S A, Rubenstein, G S, Lorch
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International Journal of Electronics, 1969
A new type of pulse doppler radar has been described, which depends on three pulses transmitted in sequence at three different mutually coherent frequencies. The cancellation of stationary targets and signal processing for extraction of moving targets is by mutual comparison of the echo pulses.
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A new type of pulse doppler radar has been described, which depends on three pulses transmitted in sequence at three different mutually coherent frequencies. The cancellation of stationary targets and signal processing for extraction of moving targets is by mutual comparison of the echo pulses.
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Ultrasonic pulse Doppler apparatus
The Journal of the Acoustical Society of America, 1989An ultrasonic pulse Doppler apparatus has: range gate (20) for separately performing range-gating of the respective received ultrasonic echo signals of the oscillation elements of an ultrasonic probe (1) each time the signals are respectively adjusted in correspondence with the direction of a received ultrasonic beam; pulse stretcher filter (21) for ...
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2014
The main objective of this chapter is to describe how an airborne pulse-Doppler radar isolates targets of interest from clutter and measures target range and velocity. Related topics such as pulse compression, automatic detection, target tracking, and target and clutter statistics are described.
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The main objective of this chapter is to describe how an airborne pulse-Doppler radar isolates targets of interest from clutter and measures target range and velocity. Related topics such as pulse compression, automatic detection, target tracking, and target and clutter statistics are described.
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TRANSŒSOPHAGEAL PULSED DOPPLER ECHOCARDIOGRAPHY
The Lancet, 1979K, Hisanaga +6 more
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Pulsed Doppler Echocardiography: An Historical Perspective
Journal of the American Society of Echocardiography, 2018Over the past six decades, echocardiography has evolved into an important technique for not only imaging cardiac structures, but also, by employing the Doppler equation, for assessing cardiac blood flow and tissue velocities. This review focuses on pulsed Doppler echocardiography: its principles, early development, and clinical applications.
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Colour and pulsed Doppler ultrasonographic study of the canine testis.
Reproduction in domestic animals = Zuchthygiene, 2012José Daniel Ruiz Carrillo +3 more
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Smart Doppler Cloak Operating in Broad Band and Full Polarizations
Advanced Materials, 2021Xin Ge Zhang +2 more
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