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Versatile system for ultrasound equipment parameters measurement is presented. The
system is based on single direct digital synthesis (DDS) generator which is used for excitation and dual
simultaneous sampling analog-to-digit (ADC) conversion channels. System is dedicated for ultrasound
equipment frequency domain parameters measurement: transductio...
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Citations
... Probing and data acquisition were carried out using versatile data acquisition system [17]. System uses same reference frequency for generator based on direct digital synthesis (DDS) which is used to generate the exciting sine signal and for the acquisition ADC. ...
... All details on acquisition procedure will be given in full paper. Complex fundamental amplitude is established using sine wave correlation (SWC) technique [17]. Obtained AC response is used to calculate the effective bandwidth: ...
... Output noise measurements are taken either using ultrasonic transducer or source impedance simulating network. Details on acquisition system used in these measurements can be found in [17]. ...
... Probing and data acquisition were carried out using versatile data acquisition system [17]. System uses same reference frequency for generator based on direct digital synthesis (DDS) which is used to generate the exciting sine signal and for the acquisition ADC. ...
... All details on acquisition procedure will be given in full paper. Complex fundamental amplitude is established using sine wave correlation (SWC) technique [17]. Obtained AC response is used to calculate the effective bandwidth: ...
... Output noise measurements are taken either using ultrasonic transducer or source impedance simulating network. Details on acquisition system used in these measurements can be found in [17]. ...
Usually, imaging and measurement using ultrasound employs the application of single pulse signals for probing. Despite low correlation sidelobes and wide bandwidth which contribute to the good temporal resolution such single pulses have low energy. If material attenuation and scattering are high, or application is air-coupled, signal losses are high and signal-to-noise ratio is low. Spread spectrum signals are used to spread the energy over time, producing long signals which can be compressed by matched filter producing the processing gain, which in turn is used for signal-to-noise ratio improvement. Long duration of the SS signals imposes specific requirement. Existing standards are dedicated for single pulse signals and low impedance equipment and are not exhaustive in full performance evaluation. New technique, aimed at SS signals application is presented. Aim of the work was to develop the technique for ultrasonic preamplifier performance under high energy probing pulses investigation. Recovery time, gain and input impedance frequency response, clamping energy consumption performance evaluation parameters and measurement procedures have been developed and presented. Preliminary investigation results are presented.
... Probing and data acquisition were carried out using versatile data acquisition system [17]. System uses same reference frequency for generator based on direct digital synthesis (DDS) which is used to generate the exciting sine signal and for the acquisition ADC. ...
... All details on acquisition procedure will be given in full paper. Complex fundamental amplitude is established using sine wave correlation (SWC) technique [17]. Obtained AC response is used to calculate the effective bandwidth: ...
... Output noise measurements are taken either using ultrasonic transducer or source impedance simulating network. Details on acquisition system used in these measurements can be found in [17]. ...
It was demonstrated that there is a demand for complex pulse series generation in spread spectrum and air-coupled ultrasonic measurements. Existing standards and research do not account ultrasonic pulser parameters essential for such applications. Demand for new, automated performance evaluation measurements has been outlined. Structure of the dedicated ultrasonic data acquisition system for pulser performance investigation is presented. Performance evaluation involves automated measurement of standard parameters, such as attainable voltage range, rise and fall fronts. Additionally, new parameters, essential for spread spectrum signal generation are rectified and accounted. Pulser output impedance measurement setup and procedure was developed. Measured impedance interaction with ultrasonic transducer can be evaluated for attainable power delivery efficiency and bandwidth. Pulser output AC response measurement equipment and procedure was developed. Intrinsic losses are accounted by measuring the energy per pulse consumption. Pulser output versus several types of load can be measured, resulting in performance evaluation under conditions that are closer to the real load type. Preliminary investigation results of the representative pulser are presented.
