Application Cases

Experiment Name: Experiment on the Study of Ultrasonic Doppler Effect Using a Broadband Power Amplifier

Experiment Content:Vascular occlusion is a common cardiovascular disease. The velocity of blood flow in the carotid artery can be measured using the ultrasonic Doppler effect, which helps determine whether there is a blockage in the blood vessel. When ultrasonic waves are reflected by red blood cells in the flowing blood, the frequency changes due to the Doppler effect, which can be used to determine the blood flow velocity.

Research Direction: Ultrasonic Detection

Testing Equipment:Signal generator, ATA-1220D broadband amplifier, oscilloscope, ultrasonic probe, etc.

Experimental Process:

Figure: Photograph of the Experimental Setup

Two ultrasonic probes are attached to the carotid artery, with one used for transmitting signals and the other for receiving signals. Coupling agent should be applied between the ultrasonic probe and the carotid artery. A 10 MHz excitation signal generated by the signal generator is amplified by the ATA-1220D broadband amplifier and applied to the ultrasonic probe, generating a 10 MHz ultrasonic wave. The other ultrasonic probe is connected to the oscilloscope to receive the signal. The signal is then demodulated, filtered, and processed through a Fourier transform to obtain the blood flow velocity distribution map.

Experimental Results:

Figure 2: Experimental Results

The distribution of blood flow velocity in the carotid artery and the corresponding characteristics of the cardiac cycle were measured. These include the first systolic phase (S1), the second systolic phase (S2), the peak velocity during diastole (D), the end-diastolic velocity (d), and the boundary line between systole and diastole (I). After the volunteer engaged in physical exercise, a significant increase in frequency shift was observed, indicating a marked increase in the blood flow velocity in the carotid artery. The heart rate also increased significantly, and the cardiac cycle was clearly visible.

Broadband Amplifier Recommendation: ATA-1372A

Figure: Performance Parameters of the ATA-1372A Broadband Amplifier

This material is compiled and released by Aigtek. For more case studies and product details, please continue to follow us. Aigtek, based in Xi’an, has become a widely recognized supplier of instruments and equipment with a broad product line and considerable scale. We offer free trials of demo units. For more information on power amplifiers and other products, please visit our official website at www.aigtek.cn or call 029-88865020.