Experimental Study On Measurement Of Ultrasonic Cavitation Field With Sonoluminescence

Ultrasound has been extensively applied in many fields with the development of science and technology. For example classic power ultrasound, wine ultrasound, ultrasound measurement, ultrasound medicine, the marginal subjects such as ultrasound cleaning, sonochemistry and sonobiology have advanced rapidly, and new results have came out now and then. Ultrasonic cavitation is the main mechanism that induces all kinds of physical, chemical and biologic effects during these applications. So the researches of theory and experiment of cavitation become focus. The cavitation correlates with many factors, and going with complicated nonlinearity, which makes many difficulties in the researches of the theory of cavitation, so the researches of cavitation are mostly experiment and applications.In the circumstance of the ultrasound cavitation field, the cavitation bubbles of the fluid inflate and contract with the acoustic field. Highly intensive energy will be concentrated in the bubbles and that will flash. This phenomenon is called sonoluminescence. In the sonoluminescence the movement of the bubbles converts acoustic energy of low-energy intensity to luminous energy of high-energy intensity. To study the theory the energy concentrative, researchers carry through disquisition continually to the bubble dynamics and mechanism of sonoluminescence, that makes sonoluminescence become hot research in physics and nonlinear acoustics. Sonoluminescence is assorted two types of single-bubble sonoluminescence and multiple-bubble sonoluminescence according to amount of air bubble. In 1934, H. Frenzel and H. Schultes in Cologne university who found accidentally macroscopic illumination besides the crepitation of bubbles when they researched sonar, which are generally called "Multiple-bubble sonoluminescence". In 1990, D. F. Gaitan in Mississippi university made single bubble be entangled in the center of water and let it illuminate a few hours stably and persistently, which are generally called "Single-bubble sonoluminescence".In this paper following work has been done based on the theory and experiment research of sonoluminescence, the four main contents and resents of the research are as follows:1. The principle that Luminol enhances sonoluminescence, filming the procession of the cavitation bubble's athletics with camera.2. The glimmer measurement instrument is designed and made, and the characteristics and function of it are analyzed.3. Measuring sonoluminescence intensity of cleaning tank with the glimmer measurement instrument. With 22 kHz's, 27 kHz's and 40 kHz's Ultrasound, changing power density and getting to mutual sonoluminescence intension, the result indicated: only power density exceeds threshold value average acoustic intension in fluid, sonoluminescence will happen. With 22 kHz's transducer radiation, luminous intensity accesses straightly with power density, but not to saturation value; with 27 kHz's transducer radiation, luminous intensity accesses trap with power density; with 40 kHz's transducer radiation, luminous intensity accesses wave with power density, and get to saturation value twice.4. Analyzing ultrasound frequency to affect sonoluminescence intensity. Different frequency correspond different luminous threshold value. Higher frequency correspond higher threshold value. As to sound signal engender luminescence first in a sound cycle, different frequency ultrasound engender different times of luminescence in unit time. In the same power density, different frequency correspond different luminous intensity, so in the different frequency, different curve between luminous intensity and power density.