Detection method for maximum bubble radius of cavitating bubbles
A detection method and cavitation bubble technology, which is applied in the field of photoelectric detection, can solve the problems of heavy workload and maximum radius error, and achieve the effect of loosening the requirements for the number of repeated detections, reducing the number of detections, and reducing the requirements for spatial adjustment accuracy
Inactive Publication Date: 2013-03-13
NANJING UNIV OF SCI & TECH
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However, the disadvantage is that the implementation of this method requires a large number of repeated measurements at each detection position, and the workload of measurement and post-analysis is huge; and if only a small number of repeated measurements are used, the maximum radius obtained will have a large error
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Embodiment 1
[0044] Implementation example 1 (detection of the maximum bubble radius of laser-induced cavitation bubbles)
[0045] Step 1. Build an optical deflection detection system according to the structural diagram of the optical deflection detection system. Among them, the detection beam adopts He-Ne beam (wavelength 632.8nm); the material of container 9 is optical glass with high transmittance near the wavelength of 632.8nm and 1064nm, and the pressure in the container is adjusted to 1.5atm; the photoelectric detection system uses optical fiber as Aperture diaphragm, photomultiplier tube as photoelectric conversion device.
[0046] Step 2. Adjust the multi-dimensional adjustment frame for placing the optical fiber to maximize the energy coupled into the optical fiber, and at this time the voltage value of the waveform displayed on the oscilloscope is also the maximum.
[0047] Step 3. In this example, the cavitation bubbles are generated by laser optical breakdown, and the focus po...
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The invention discloses a high-efficiency and high-precision detection method for the maximum bubble radius of cavitating bubbles. The radius information of the cavitating bubbles is scanned and detected according to the light beam deflection principle through being combined with the scanning technology. A detection system platform comprises a detection light beam laser, a focusing lens, a coupling lens, a small hole diaphragm, a photoelectric detection system, an oscilloscope and a multi-dimension regulation transverse moving table. The radius information of the cavitating bubbles in each detection position part through gradual scanning from the original point, and when the corresponding characteristic waveform of the maximum bubble radius of the cavitating bubbles occurs, the characteristic waveform occurring probability k in the corresponding detection position and the distance valve d from the detection position to the original point at the time are started to be recorded until the value of the probability k is zero. The weighting coefficient p of the corresponding detection distance value d through the calculation from the recording to the probability k, and finally, the weighted average of the maximum bubble radius of the cavitating bubbles and the corresponding root-mean-square error estimation are obtained through the calculation via a weighted formula. The high-efficiency and high-precision detection method has the advantages that the space regulation precision requirement of the multi-dimension transverse moving platform for carrying the light deflection test system is effectively reduced, and the cost is reduced.
Description
technical field [0001] The invention belongs to the field of photoelectric detection, in particular to a detection device and a detection method for the maximum bubble radius of cavitation bubbles. Background technique [0002] Since the discovery of cavitation bubbles in the 19th century, scholars have carried out a series of theoretical, numerical and experimental studies on them, especially the kinetic theory of a single cavitation bubble and its expansion and contraction behavior. With the advancement of science and technology, the effect of cavitation bubbles has begun to be used in various fields, such as: ultrasonic cavitation bubble cleaning, the use of high-speed jets when cavitation bubbles collapse to enhance the fatigue resistance of materials, refinement and homogenization Particles in suspension or emulsion. The maximum bubble radius of the cavitation bubble is regarded as the basic quantity of the cavitation bubble, and the detection method of its value is pa...
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IPC IPC(8): G01B11/08
Inventor 陆建李贝贝张宏超
Owner NANJING UNIV OF SCI & TECH