The vibration mode of the MEMS ultrasonic transducer array, which is measured by a laser Doppler vibrometer (MSA600, Polytec, Germany), is shown in Fig. 2d. The excitation signal is a continuous wave with a voltage of 5 Vpp and a frequency of 960 kHz. The displacement sensitivity is ...
A portable, non-invasive flowmeter for a partially filled pipe includes a Doppler shift velocity sensor and a level sensor, each of which has an ultrasonic transducer which is releasably attached to the outside of the pipe out of communication with the interior thereof. The transducers are coupl...
Another common form of imaging iscontinuous-wave(CW)Doppler, or D-mode, for showing blood flow velocities and their frequencies. As the name suggests, the image is produced using continuously generated signals, where one-half the transducer channels are transmitting and the other half are receiving...
Development of Portable Eye-Safe Depolarization Coherent Doppler Lidar and Observations of Asian DustA prototype model of portable eye-safe depolarization coherent Doppler lidar system has been developed for measuring wind and behaviors of aerosols such as dust, pollutants and so on. Figure 1 shows ...
The suite of machine diagnostics included linear Rogowski coils and Faraday rotation for current measurements. The experimental diagnostics include B-dot probes, multi-channel photon Doppler velocimetry (PDV), and single-frame, flash X-radiography to evaluate the performance of the high p...
The receive signal is conditioned into logic pulses that are used to control the phasing and duty cycle of a HIFU transmission. The imager displays bleeds in color, based on a Doppler signature, and reveals a bright spot in the treatment area that enables minimally trained personnel "to point...
Plantarflexor central drive is a promising biomarker of neuromotor impairment; however, routine clinical assessment is hindered by the unavailability of force measurement systems with integrated neurostimulation capabilities. In this study, we evaluate t
The ADPD1080 is programmed in such a way that the LEDs are pulsed with 3 μμss pulse width and six pulses per measurement. Simultaneously, the photodiode is read such that ambient light is suppressed and the signal-to-noise ratio (SNR) is improved. Ambient light suppression is achieved ...
At the same time, the ISDR is a more versatile instrument that supports a bistatic operation, provides Doppler measurements and polarization information, and has a significantly lower cost and transmission power. Different configurations of the ISDR are considered. The basic configuration allows for ...
Several optimizations are available for implementing the H.264 codec on an FPGA, but the FPGA resources in the proposed portable ultrasound system are preserved for implementing complex Doppler ultrasound. In the proposed portable ultrasound system, the H.264 codec is installed on a Raspberry Pi ...