Ultrasonic Measurement
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The document discusses ultrasonic blood flow meters, detailing their classification into transit and Doppler types, and their applications in measuring blood velocity, volume flow, and flow direction. It highlights the principle of operation and the significance of piezoelectric transducers, such as lead zirconate titanate, in generating mechanical vibrations from electric fields. Additionally, it covers mathematical expressions relevant to the Doppler shift method and includes a block diagram of the Doppler shift flowmeter.
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Ultrasonic Measurement
- 1. ULTRASONIC BLOOD FLOW METER Learning Points Classification : Transit Type & Doppler Type Applications. Principle & Mathematical Expressions. Role of Lead Zirconate Titanate transducer. Presented By Gaurav Pandey
- 2. Ultrasonic Vibrations • Frequency above 20 kHz- above the hearing range is called as ultrasound. • By far the most popular and versatile type of ultrasonic transducer is the piezoelectric crystal, which converts an oscillating electric field applied to the crystal into a mechanical vibration. • Piezoelectric crystals include quartz, Rochelle salt, and certain types of ceramic. • Shorter wavelength have higher generating power can be transmitted over a long distance without loss of energy.
- 3. Application : Biomedical Measurement of blood velocity. Volume Flow. Flow Direction. Flow Profile. Visualize the lumen of blood vessel.
- 4. Classification 1.Transit type velocity flow meter. 2.Doppler Shift Type.
- 5. Transit Time Velocity Meter
- 6. Mathematical Equations with respect to upstream and downstream
- 9. Block Diagram-Doppler Shift Flowmeter