Abstract
A 5-MHz ultrasonic sensing device which detects and monitors microparticles in a moving fluid stream has been described, constructed, and calibrated, The ultrasonic transducer is so placed that a thin section of plexiglas exists between the transducer and the fluid stream. This section is of piano-concave shape and acts as a converging lens to focus the transducer at approximately 1.36 cm from the surface of the lens. The pulsed ultrasonic signal is transmitted into the fluid which flows through a calibrated and mapped sound radiation field. The calibration of the field for particle size was done through the use of carbonized microspheres, glass beads and air bubbles of known sizes. The device is calibrated to detect and monitor microparticles in the range of 7–400 μm in diameter. A formula was derived from these calibration studies which relates reflected amplitude to particle size. The radiation field was mapped using a target ball of 0.635 cm in diameter. The apparatus has been used successfully during in vivo extra-corporeal studies done on sheep, and has recorded microparticles during these procedures. [Work supported by Rhode Island Heart Association.]
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