CN110618133A - Device and method for detecting dynamics of symmetric vacuoles in transparent liquid environment - Google Patents
Device and method for detecting dynamics of symmetric vacuoles in transparent liquid environment Download PDFInfo
- Publication number
- CN110618133A CN110618133A CN201910987699.8A CN201910987699A CN110618133A CN 110618133 A CN110618133 A CN 110618133A CN 201910987699 A CN201910987699 A CN 201910987699A CN 110618133 A CN110618133 A CN 110618133A
- Authority
- CN
- China
- Prior art keywords
- detection
- cylindrical
- concave lens
- lens
- cylindrical concave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a device and a method for detecting dynamics of symmetrical vacuoles in a transparent liquid environment. Each beam of the linear detection light in the row-shaped detection light is converted into an electric signal through an independent photoelectric detector and is displayed by an oscilloscope. And analyzing a group of data obtained by the oscilloscope to obtain the dynamic behavior of the single symmetrical vacuole. The invention realizes the detection of the single symmetrical cavitation dynamic behavior in the transparent liquid environment through single measurement, has simple and high-efficiency method, and is suitable for the detection of the symmetrical cavitation dynamic behavior with the magnitude of hundreds of microns and above.
Description
Technical Field
The invention relates to the field of photoelectric detection, in particular to the field of cavitation optical detection, and particularly relates to a detection device and a detection method for symmetric cavitation dynamics in a transparent liquid environment.
Background
Cavitation is a physical phenomenon common in nature and in human productive life, and its attention has mainly been paid to the serious propeller efficiency degradation event which occurs in succession in uk "dare" torpedo boats and several steam-powered boats in 1897. In the early stage, people's research on cavitation bubbles mostly focuses on negative effects generated by the cavitation bubbles, such as the degradation and destruction effects of the cavitation bubbles on the surfaces of hydraulic machinery, dams and other facilities, and the destructive effect of cavitation noise on the concealment of underwater weapons such as torpedoes and the like. With the continuous development of science and technology and the continuous and deep research on cavitation, people find that more and more fields relate to the cavitation, and the cavitation is the one which begins to show the advantages in some fields. For example, in the medical field, cavitation bubbles can be used to break up body stones; in the biological field, vacuoles can be used for cell membrane puncture; in the field of industrial processing, cavitation bubbles can be applied to water conservancy drilling. Therefore, the research of the cavitation has important practical significance.
The kinetic behavior of cavitation is one of the main research contents of cavitation. There are many commonly used cavitation dynamics experiment detection methods, which can be mainly divided into two types: one is an experimental method based on photography, such as high-speed photography, schlieren method, holography, etc.; another type is an experimental method based on a probe beam, such as a beam deflection method, a beam transmission method, etc. Among them, the most desirable method is a high-speed photography method which can be used for detection of spherical vacuoles, non-spherical symmetric vacuoles, and asymmetric vacuoles. However, since the life cycle of the cavitation is short, in order to accurately detect the dynamic behavior of the cavitation, the high-speed photography method needs to be equipped with a high-speed camera with a high frame rate, which is expensive. The dynamic behavior of symmetric vacuoles is a common subject. For this purpose, a laser beam can be used as the basic detection means, by splittingAnalyzing the light beam disturbed by the cavitation to extract the dynamic information of the laser beam and the cavitation point, such as a beam deflection method, a beam transmission method and the like. The method is simple, easy to operate and low in cost, and is mostly used for the dynamic measurement of the symmetric vacuoles. The method is typically adopted at the university of Lubuyana of Schluwennia in 2007R et al, who have measured the two-dimensional topography at a certain moment of cavitation by using a beam deflection method and a two-dimensional scanning method, but the topography is based on highly repeatable cavitation and is obtained by repeated measurement and analysis, and the workload is huge. The optical measurement method based on probability analysis proposed by Liebebei et al in China improves the measurement precision and workload, but the method is still based on high repeatability of cavitation bubbles, and repeated measurement is required for many times. How to perform low-cost and high-efficiency detection on the kinetic behavior of single vacuoles is always the development direction of the optical measurement method in the field.
Disclosure of Invention
The invention aims to provide a device and a method for efficiently detecting the dynamic behavior of symmetrical vacuoles in a transparent liquid environment.
The technical solution for realizing the purpose of the invention is as follows: a detection device for symmetric cavitation dynamics in a transparent liquid environment comprises a detection beam laser, a beam expander, a first cylindrical concave lens, an adjustable optical slit, a first cylindrical convex lens, a rectangular diaphragm, a second cylindrical concave lens, a second cylindrical convex lens, an equidistant rectangular diaphragm, a third cylindrical convex lens, a third cylindrical concave lens, a fourth cylindrical concave lens, a lens group for focusing detection beams, a photoelectric detector group with an interference filter, a wave indicator group and a container which is provided with a detection light window and contains transparent liquid;
the equal-spacing rectangular diaphragms comprise n rectangular diaphragms, and the number of lenses contained in a lens group for focusing detection beams, the number of photoelectric detectors contained in a photoelectric detector group with interference filters and the number of oscilloscopes contained in an oscillograph group are all n; the device comprises a detection beam laser, a beam expander, a first cylindrical concave lens, an adjustable optical slit, a first cylindrical convex lens, a rectangular diaphragm, a second cylindrical concave lens, a second cylindrical convex lens, an equidistant rectangular diaphragm, a third cylindrical convex lens, a third cylindrical concave lens and a fourth cylindrical concave lens which are coaxially arranged in sequence along the emission direction of a detection beam, and a container which is provided with a transmission detection light window and contains transparent liquid is positioned between the third cylindrical concave lens and the fourth cylindrical concave lens; and each beam of detection light diffused by the fourth cylindrical concave lens is respectively focused on the corresponding photoelectric detector in the photoelectric detector group with the interference filter by the lens group for focusing the detection light beams, and the output ends of the photoelectric detector group with the interference filter are connected with the oscillograph groups in a one-to-one correspondence manner.
Furthermore, the axial meridian of the first cylindrical concave lens and the first cylindrical convex lens is in the same direction with the slit center line of the adjustable optical slit and the symmetry axis of the measured symmetric cavity.
Furthermore, the long symmetry axis of the rectangular diaphragm and the equidistant rectangular diaphragm is in the same direction as the axial meridian of the second cylindrical concave lens, the second cylindrical convex lens, the third cylindrical concave lens and the fourth cylindrical concave lens, and the direction is perpendicular to the emission direction of the detection beam laser and the symmetry axis direction of the detected symmetric cavitation bubbles in pairs.
Further, the length of the rectangular diaphragm is larger than that of the rectangular diaphragm with equal spacing.
Further, the probe beam laser employs a He — Ne laser having a gaussian light intensity distribution.
A method for detecting the dynamics of symmetric vacuoles in a transparent liquid environment comprises the following steps:
step 1, expanding a detection beam generated by a detection beam laser by m times by using a beam expander;
step 2, adjusting each optical device to enable the detection beam laser, the beam expander, the first cylindrical concave lens, the adjustable optical slit, the first cylindrical convex lens, the rectangular diaphragm, the second cylindrical concave lens, the second cylindrical convex lens, the equidistant rectangular diaphragm, the third cylindrical convex lens, the third cylindrical concave lens and the fourth cylindrical concave lens to be coaxial and equal in height, and adjusting the adjustable optical slit to the maximum gap;
step 3, adjusting the distance between the first cylindrical concave lens and the first cylindrical convex lens to enable the detection light beam passing through the first cylindrical convex lens to be parallel light beams, and enabling the combination of the first cylindrical concave lens and the first cylindrical convex lens to have beam expanding effect on the light beam in the direction of the refractive power meridian of the first cylindrical concave lens and the refractive power meridian of the first cylindrical convex lens to be not less than 10 times;
step 4, reducing the gap width of the adjustable optical slit until the detection light beam reaching the first cylindrical convex lens after passing through the adjustable optical slit does not exceed the effective focusing surface of the first cylindrical convex lens, so that the detection light beam passing through the rectangular diaphragm is adjusted into a linear light beam with uniform light intensity distribution;
step 5, adjusting the distance between the second cylindrical concave lens and the second cylindrical convex lens, so that the light beam passing through the second cylindrical convex lens expands in the direction of the refractive power meridian of the second cylindrical concave lens and the second cylindrical convex lens until the expanded detection light beam covers all rectangular diaphragms of the equidistant rectangular diaphragms, and thus the detection light beam passing through the equidistant rectangular diaphragms is adjusted into a row-shaped parallel detection light beam with uniform light intensity distribution;
step 6, adjusting the distance between the third cylindrical convex lens and the third cylindrical concave lens to ensure that the row-shaped parallel detection light beams passing through the third cylindrical concave lens are still parallel light and ensure that the width l of a detection area of the row-shaped parallel detection light beams is larger than the axial maximum diameter of the detected symmetrical vacuole;
and 7, adjusting the positions of the lens group for focusing the detection light beams and the photoelectric detector group with the interference filter, so that each beam of detection light diffused by the fourth cylindrical concave lens is focused on the corresponding photoelectric detector in the photoelectric detector group with the interference filter respectively, and each signal voltage obtained by the oscillograph group is maximum and is marked as V respectivelyi(max)，i＝1,2,…,n；
Step 8, completely shielding the detection light beam, recording the signal voltage obtained on the oscillograph group at the moment, and respectively recording the signal voltage asVi(min)；
Step 9, generating a detected symmetrical cavity in a container which is provided with a transparent liquid and can transmit a detection light window by using a cavity generating device, ensuring that the center of the row-shaped parallel detection light beam passes through the generated position of the detected symmetrical cavity, enabling the symmetry axis of the detected symmetrical cavity to be in the same direction as the gap central line of the adjustable optical slit, and recording the waveforms of the electric signals displayed in the oscillograph set at the moment and respectively recording the waveforms as Vi(t)；
And step 10, taking the generation position of the detected symmetrical cavity as a coordinate origin o, taking the symmetry axis of the detected symmetrical cavity as an x axis, taking the long symmetry axis of the rectangular diaphragm as a y axis, establishing a spatial variation relation of each detection point in the xoy plane of the detection area, which is caused by the detected symmetrical cavity, and analyzing the spatial variation relation to obtain the dynamic behavior of the symmetrical cavity in the detection area.
Further, in step 10, a formula of a spatial variation relationship caused by the detected symmetric cavitation at each detection point in the xoy plane of the detection region is as follows:
in the formula, f (x)i) Is the change of the coordinate Y of the vacuolar wall on the Y axis with time, xiAnd the abscissa of the ith detection point is, w and h are the width and the length of each rectangular diaphragm in the equidistant rectangular diaphragms respectively, s is the distance between two adjacent rectangular diaphragms, and l is the width of a detection area of the row-shaped parallel detection light beams.
Compared with the prior art, the invention has the following remarkable advantages: 1) the invention realizes multi-point detection of symmetrical vacuoles with the magnitude of hundreds of microns and above in the transparent liquid, and can obtain the change relation of the approximate appearance of a single symmetrical vacuole along with time, not only limited to the maximum vacuole radius and the pulsation period of the vacuole; 2) when the method is used for detection, only one measurement is needed, so that the workload is greatly reduced; 3) the invention can also be used for detecting the dynamic behavior of non-transparent objects with the magnitude of hundreds of microns and above.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
FIG. 1 is a schematic diagram of a detection device for symmetric cavitation dynamics in a transparent liquid environment according to the present invention, in which diagrams (a) - (e) are cross-sectional views of detection beams corresponding to the positions indicated by arrows.
Fig. 2 is a waveform diagram obtained by an oscilloscope corresponding to the detection points of the symmetric cavitation generation positions in the embodiment of the present invention, wherein a portion in a dashed line frame is caused by a shock wave radiated when laser is optically broken down in the laser-induced cavitation generation process.
Fig. 3 is a graph showing the change of the coordinate Y of the cavitation bubble wall on the Y-axis in the detection plane, i.e., the xoy plane, with time according to the embodiment of the present invention, wherein the portion in the dashed line frame is caused by the shock wave radiated when the laser breaks down in the laser-induced cavitation bubble generation process.
Fig. 4 is a graph of the coordinate position of the bubble wall of each detection point in the detection plane, i.e., the xoy plane, of the cavitation bubbles when the cavitation bubbles expand to the maximum in the embodiment of the present invention.
FIG. 5 is a diagram illustrating a test of uniformity of light intensity distribution of the row-shaped probe beam according to an embodiment of the present invention.
The reference numbers and their counterparts in the figures are: 1 a probe beam laser; 2, a beam expander; 3 a first cylindrical concave lens; 4 an adjustable optical slit; 5 a first cylindrical convex lens; 6, a rectangular diaphragm; 7 a second cylindrical concave lens; 8 second cylindrical convex lenses; 9 equal-spacing rectangular diaphragms; 10 a third cylindrical convex lens; 11 a third cylindrical concave lens; 12 a fourth cylindrical concave lens; 13 a lens group for focusing the probe beam; 14 photoelectric detector group with interference filter; 15 an oscillograph group; 16 a container containing transparent liquid and provided with a detection light transmission window; 17 schematic view of symmetrical cavitation position.
Detailed Description
With reference to fig. 1, the device for detecting symmetric cavitation dynamics in a transparent liquid environment provided by the present invention includes a detection beam laser 1, a beam expander 2, a first cylindrical concave lens 3, an adjustable optical slit 4, a first cylindrical convex lens 5, a rectangular diaphragm 6, a second cylindrical concave lens 7, a second cylindrical convex lens 8, an equidistant rectangular diaphragm 9, a third cylindrical convex lens 10, a third cylindrical concave lens 11, a fourth cylindrical concave lens 12, a lens group 13 for focusing a detection beam, a photoelectric detector group 14 with an interference filter, a wave indicator group 15, and a container 16 containing transparent liquid and provided with a detection light transmission window;
the equidistant rectangular diaphragm 9 comprises n rectangular diaphragms, and the number of lenses contained in a lens group 13 for focusing the detection light beams, the number of photoelectric detectors contained in a photoelectric detector group 14 with interference filters and the number of oscilloscopes contained in an oscillograph group 15 are all n; the device comprises a detection beam laser 1, a beam expander 2, a first cylindrical concave lens 3, an adjustable optical slit 4, a first cylindrical convex lens 5, a rectangular diaphragm 6, a second cylindrical concave lens 7, a second cylindrical convex lens 8, an equidistant rectangular diaphragm 9, a third cylindrical convex lens 10, a third cylindrical concave lens 11 and a fourth cylindrical concave lens 12 which are coaxially arranged in sequence along the transmission direction of a detection beam, and a container 16 which is provided with a detection light transmission window and contains transparent liquid is positioned between the third cylindrical concave lens 11 and the fourth cylindrical concave lens 12; the lens group 13 for focusing the detection light beams respectively focuses each detection light beam diffused by the fourth cylindrical concave lens 12 onto a corresponding photoelectric detector in the photoelectric detector group 14 with the interference filter, and the output ends of the photoelectric detector group 14 with the interference filter are correspondingly connected with the oscilloscope groups 15 one by one.
Further, the axial meridian of the first cylindrical concave lens 3 and the first cylindrical convex lens 5 is in the same direction with the slit center line of the adjustable optical slit 4 and the symmetry axis of the measured symmetric cavity 17.
Further, the long symmetry axes of the rectangular diaphragm 6 and the equidistant rectangular diaphragm 9 are in the same direction as the axial meridians of the second cylindrical concave lens 7, the second cylindrical convex lens 8, the third cylindrical convex lens 10, the third cylindrical concave lens 11 and the fourth cylindrical concave lens 12, and the direction is pairwise perpendicular to the emission direction of the detection beam laser 1 and the symmetry axis direction of the symmetric cavity 17 to be detected.
Further, the rectangular diaphragm 6 is longer than the equally spaced rectangular diaphragm 9.
Further, the probe beam laser 1 employs a He — Ne laser having a gaussian light intensity distribution.
Exemplarily, the wavelength of the He — Ne laser is 632.8nm, and the spot diameter is 2 mm.
The detection method of the detection device based on the symmetric vacuole dynamics in the transparent liquid environment comprises the following steps:
step 1, expanding a detection beam generated by a detection beam laser 1 by m times by using a beam expander 2;
step 2, adjusting each optical device to enable the detection beam laser 1, the beam expander 2, the first cylindrical concave lens 3, the adjustable optical slit 4, the first cylindrical convex lens 5, the rectangular diaphragm 6, the second cylindrical concave lens 7, the second cylindrical convex lens 8, the equidistant rectangular diaphragm 9, the third cylindrical convex lens 10, the third cylindrical concave lens 11 and the fourth cylindrical concave lens 12 to be coaxial and equal in height, and adjusting the adjustable optical slit 4 to be the largest in gap;
step 3, adjusting the distance between the first cylindrical concave lens 3 and the first cylindrical convex lens 5 to enable the detection light beam passing through the first cylindrical convex lens 5 to be parallel light beams, and enabling the combination of the first cylindrical concave lens 3 and the first cylindrical convex lens 5 to have the beam expanding effect on the light beams in the direction of the refractive power meridian of the first cylindrical concave lens 3 and the refractive power meridian of the first cylindrical convex lens 5 to be not less than 10 times;
step 4, reducing the gap width of the adjustable optical slit 4 until the detection light beam reaching the first cylindrical convex lens 5 after passing through the adjustable optical slit 4 does not exceed the effective focal plane of the first cylindrical convex lens 5, so as to adjust the detection light beam passing through the rectangular diaphragm 6 into a linear light beam with uniform light intensity distribution;
step 5, adjusting the distance between the second cylindrical concave lens 7 and the second cylindrical convex lens 8, so that the light beam passing through the second cylindrical convex lens 8 expands in the direction of the refractive power meridian of the second cylindrical concave lens 7 and the second cylindrical convex lens 8 until the expanded detection light beam covers all rectangular diaphragms of the equidistant rectangular diaphragms 9, and thus the detection light beam passing through the equidistant rectangular diaphragms 9 is adjusted into a row-shaped parallel detection light beam with uniform light intensity distribution;
step 6, adjusting the distance between the third cylindrical convex lens 10 and the third cylindrical concave lens 11 to ensure that the row-shaped parallel detection light beams passing through the third cylindrical concave lens 11 are still parallel light and ensure that the detection area width l of the row-shaped parallel detection light beams is larger than the axial maximum diameter of the detected symmetrical vacuole;
step 7, adjusting the positions of the lens group 13 for focusing the detection light beams and the photoelectric detector group 14 with the interference filter, so that each beam of detection light diffused by the fourth cylindrical concave lens 12 is focused on the corresponding photoelectric detector in the photoelectric detector group 14 with the interference filter, and each signal voltage obtained by the oscillograph group 15 is maximum and is respectively marked as Vi(max)，i＝1,2,…,n；
Step 8, completely shielding the detection light beam, recording the signal voltage obtained on the oscillograph group 15 at the moment, and respectively recording as Vi(min)；
Step 9, generating a detected symmetrical cavity 17 in a container 16 which is provided with a transparent liquid and can transmit a detection light window by using a cavity generating device, ensuring that the centers of the row-shaped parallel detection light beams pass through the generated position of the detected symmetrical cavity 17, ensuring that the symmetry axis of the detected symmetrical cavity 17 is in the same direction with the central line of the gap of the adjustable optical slit 4, and recording the waveforms of the electric signals displayed in the oscillograph group 15 at the moment and respectively recording the waveforms as Vi(t)；
And step 10, with the generation position of the detected symmetrical cavity 17 as a coordinate origin o, the symmetry axis of the detected symmetrical cavity 17 as an x axis, and the long symmetry axis of the rectangular diaphragm 6 as a y axis, establishing a spatial variation relationship caused by the detected symmetrical cavity 17 at each detection point in the xoy plane of the detection area, namely each light beam of the row-shaped parallel detection light beams, and analyzing the spatial variation relationship to obtain the dynamic behavior of the symmetrical cavity in the detection area.
Exemplarily and preferably, m is greater than or equal to 6 in step 1.
Further, the formula of the spatial variation relationship caused by the symmetric cavity 17 to be detected at each detection point in the xoy plane of the detection area in step 10 is:
in the formula, f (x)i) Is the change of the coordinate Y of the vacuolar wall on the Y axis with time, xiThe abscissa of the ith detection point is, w and h are the width and length of each rectangular diaphragm in the equidistant rectangular diaphragms 9, s is the distance between two adjacent rectangular diaphragms, and l is the width of the detection area of the row-shaped parallel detection beams.
The present invention will be described in further detail with reference to examples.
Examples
The detection method based on the symmetrical cavitation dynamics detection device in the transparent liquid environment in the embodiment comprises the following steps:
step 1, building an optical detection system according to a schematic diagram of a transparent liquid environment symmetric cavitation dynamic detection device shown in figure 1. Wherein the detection beam laser 1 adopts He-Ne laser beam (wavelength of 632.8nm, spot diameter of 2mm, light intensity distribution of Gaussian distribution); the beam expanding lens group 2 adopts a 6-time beam expanding lens; the length of the rectangular diaphragm 6 is 6mm, and the width of the rectangular diaphragm is 1 mm; the number n of the rectangular diaphragms in the equidistant rectangular diaphragms 9 is 7, the size of each rectangular diaphragm is the same, the length h is 5mm, the width w is 0.5mm, and the distance s between two adjacent rectangular diaphragms is 1 mm; thus, the number of the lens group 13 for focusing the detection beam, the number of the photoelectric detector groups 14 with interference filters and the number of the oscillograph groups 15 are all 7; the container 16 is made of optical glass with high transmittance at wavelengths of 632.8nm and 1064nm, and filled with deionized water; the symmetrical cavity is generated by focusing Nd: YAG laser beam (wavelength 1064nm, pulse width 7ns) on a detection area in deionized water along a direction perpendicular to the transmission direction of the detection beam and the central line of the rectangular diaphragm gap.
Step 2, adjusting each optical device to enable the detection beam laser 1, the beam expander 2, the first cylindrical concave lens 3, the adjustable optical slit 4, the first cylindrical convex lens 5, the rectangular diaphragm 6, the second cylindrical concave lens 7, the second cylindrical convex lens 8, the equidistant rectangular diaphragm 9, the third cylindrical convex lens 10, the third cylindrical concave lens 11 and the fourth cylindrical concave lens 12 to be coaxial and equal in height, and adjusting the adjustable optical slit 4 to be the largest in gap;
step 3, adjusting the distance between the first cylindrical concave lens 3 and the first cylindrical convex lens 5, enabling the detection light beam passing through the first cylindrical convex lens 5 to be a parallel light beam, and enabling the combination of the first cylindrical concave lens 3 and the first cylindrical convex lens 5 to expand the light beam by 10 times in the direction of the refractive power meridian of the first cylindrical concave lens 3 and the first cylindrical convex lens 5;
step 4, reducing the gap width of the adjustable optical slit 4 until the detection light beam reaching the first cylindrical convex lens 5 after passing through the adjustable optical slit 4 does not exceed the effective focal plane of the first cylindrical convex lens 5, so as to adjust the detection light beam passing through the rectangular diaphragm 6 into a linear light beam with uniform light intensity distribution;
step 5, adjusting the distance between the second cylindrical concave lens 7 and the second cylindrical convex lens 8, so that the light beam passing through the second cylindrical convex lens 8 is expanded by 12 times in the direction of the refractive power meridian of the second cylindrical concave lens 7 and the second cylindrical convex lens 8, and the expanded detection light beam covers all rectangular diaphragms of the equidistant rectangular diaphragms 9, so that the detection light beam passing through the equidistant rectangular diaphragms 9 is adjusted into a row-shaped parallel detection light beam with uniform light intensity distribution;
step 6, adjusting the distance between the third cylindrical convex lens 10 and the third cylindrical concave lens 11, so that the row-shaped parallel detection light beams passing through the third cylindrical concave lens 11 are still parallel light, and ensuring that the width l of a detection area of the row-shaped parallel detection light beams is greater than the axial maximum diameter of the detected symmetrical cavity, wherein in the embodiment, the axial maximum diameter of the target symmetrical cavity is not more than 4mm, and l is set to be 4.75 mm;
step 7, adjusting the positions of the lens group 13 for focusing the detection light beams and the photoelectric detector group 14 with the interference filter, so that each beam of detection light diffused by the fourth cylindrical concave lens 12 is focused on the corresponding photoelectric detector in the photoelectric detector group 14 with the interference filter, and each signal voltage obtained by the oscillograph group 15 is maximum and is respectively marked as Vi(max)I is 1,2, …,7, processing oscillograph signal by computer, and reading V1(max)＝2.74V，V2(max)＝2.78V，V3(max)＝2.80V，V4(max)＝2.82V，V5(max)＝2.81V，V6(max)＝2.78V，V7(max)＝2.75V；
Step 8, completely blocking the detection light beam, recording the signal voltage obtained on the oscillograph set 15 at the moment, respectively recording the signal voltage as Vi (min), processing the oscillograph signal through a computer, and reading V1(min)＝0.01V，V2(min)＝0.01V，V3(min)＝0.01V，V4(min)＝0.01V，V5(min)＝0.01V，V6(min)＝0.01V，V7(min)＝0.01V；
Step 9, generating a detected symmetrical cavity 17 in a container 16 which is provided with a transparent liquid and can transmit a detection light window by using a cavity generating device, ensuring that the centers of the row-shaped parallel detection light beams pass through the generated position of the detected symmetrical cavity 17, ensuring that the symmetry axis of the detected symmetrical cavity 17 is in the same direction with the central line of the gap of the adjustable optical slit 4, and recording the waveforms of the electric signals displayed in the oscillograph group 15 at the moment and respectively recording the waveforms as Vi(t)；
Step 10, taking the generating position of the detected symmetrical cavity 17 as a coordinate origin o, the symmetry axis of the cavity as an x axis, and the long symmetry axis of the rectangular diaphragm 6 as a y axis, and establishing a spatial variation relation f (x) caused by the cavity of each detection point in the xoy plane of the detection area (x is the same as the x axis)i) Comprises the following steps:
by analyzing the spatial variation relationship, the dynamic behavior of the symmetric vacuoles in the detection region can be obtained. The specific analysis process is as follows:
electric signal waveform V obtained from a detection point at the origin of coordinates, i.e., a cavitation bubble generation position, in xoy plane4(t) for example (as shown in FIG. 2), the time-varying relation of the coordinate Y of the inner bubble wall in the xoy plane on the Y-axis can be obtained by formula conversion (as shown in FIG. 3). And for a detection point of the coordinate origin, the absolute value of the coordinate of the cavity bubble wall of the detection point on the y axis is the radius of the cavity. It can be obtained that the maximum bubble radius R of the cavitation bubbles in the y-axis directionmax1.93mm, first pulsation period T of cavitationos1＝364μs。
And (4) carrying out the same analysis on the other 6 detection points to obtain a coordinate position diagram of the vacuole bubble wall of each detection point in the xoy plane at any moment. FIG. 4 shows the expansion of the vacuoles to a maximum, TmaxThe coordinate position of each detection point bubble wall in the xoy plane of the time bubble is 181 mu s, and therefore the rough topography of the time bubble is obtained. The detection of the dynamic behavior of the vacuoles can be realized by analyzing the vacuole shapes at different moments.
The invention provides a method for detecting the dynamics of symmetrical vacuoles in a transparent liquid environment, which is mainly characterized in that a row-shaped detection light beam with uniform light intensity distribution is generated. The basic principle is that based on the detection beam with the light intensity space distribution being Gaussian distribution, the part with the light intensity change being slow in the central area of the Gaussian detection beam is extracted through the optical element group, and then the row-shaped detection beam with the uniform light intensity distribution is generated through the equidistant rectangular diaphragm 9. After the detection device of the symmetric cavitation dynamics in the transparent liquid environment is built, the light intensity distribution uniformity of each 'one-line' detection beam in the row-shaped detection beams needs to be verified. The specific method is to sequentially carry out the detection on each beam of the linear detection light beam in the y-axis directionGradually shielding and reading the corresponding voltage value displayed by the oscilloscope. Firstly, shielding the length of a selected 'straight-line' detection beam by 0.2mm, and reading the voltage value of an oscilloscope; then shielding the length of the 'straight-line' detection light beam by 0.4mm, and reading the voltage value of the oscilloscope; and reading the voltage value of the oscilloscope until the selected linear probe beam is completely shielded. After the uniformity test is carried out on each 'one word line' detection beam in the row-shaped detection beams, the length Y of the shielded part of the 'one word line' detection beam can be obtainedCThe relationship graph of the Voltage of the signal received by the corresponding oscilloscope is shown in fig. 5. It can be seen that the light intensity distribution of the 7 in-line detection light beams in this example is relatively uniform, thereby indicating that the detection method of the symmetric cavitation dynamics in the transparent liquid environment of the present invention is feasible.
The invention realizes the detection of the dynamic behavior of the symmetric cavitation bubbles in the transparent liquid environment through single measurement, has simple and high-efficiency method, and is suitable for the detection of the dynamic behavior of the symmetric cavitation bubbles with the magnitude of hundreds of microns and above.
Claims (9)
1. The device for detecting the dynamics of the symmetric cavitation bubbles in the transparent liquid environment is characterized by comprising a detection beam laser (1), a beam expander (2), a first cylindrical concave lens (3), an adjustable optical slit (4), a first cylindrical convex lens (5), a rectangular diaphragm (6), a second cylindrical concave lens (7), a second cylindrical convex lens (8), an equidistant rectangular diaphragm (9), a third cylindrical convex lens (10), a third cylindrical concave lens (11), a fourth cylindrical concave lens (12), a lens group (13) for focusing detection beams, a photoelectric detector group (14) with an interference filter, a wave indicator group (15) and a container (16) which is provided with a transmission detection light window and contains transparent liquid;
the equal-interval rectangular diaphragm (9) comprises n rectangular diaphragms, and the number of lenses contained in a lens group (13) for focusing detection beams, the number of photoelectric detectors contained in a photoelectric detector group (14) with an interference filter and the number of oscilloscopes contained in an oscillograph group (15) are all n; the device comprises a detection beam laser (1), a beam expander (2), a first cylindrical concave lens (3), an adjustable optical slit (4), a first cylindrical convex lens (5), a rectangular diaphragm (6), a second cylindrical concave lens (7), a second cylindrical convex lens (8), an equidistant rectangular diaphragm (9), a third cylindrical convex lens (10), a third cylindrical concave lens (11) and a fourth cylindrical concave lens (12) which are coaxially arranged in sequence along the transmission direction of the detection beam, and a container (16) which is provided with a detection light transmission window and contains transparent liquid is positioned between the third cylindrical concave lens (11) and the fourth cylindrical concave lens (12); each beam of detection light diffused by the fourth cylindrical concave lens (12) is respectively focused on a corresponding photoelectric detector in a photoelectric detector group (14) with an interference filter by a lens group (13) for focusing the detection light beams, and the output ends of the photoelectric detector group (14) with the interference filter are correspondingly connected with the oscillograph groups (15) one by one.
2. The device for detecting the dynamics of symmetric cavitation bubbles in transparent liquid environment according to claim 1 is characterized in that the axial meridian of the first cylindrical concave lens (3) and the first cylindrical convex lens (5) is in the same direction with the slit center line of the adjustable optical slit (4) and the symmetry axis of the symmetric cavitation bubble (17) to be detected.
3. The device for detecting the dynamics of symmetric cavitation bubbles in transparent liquid environment according to claim 1 is characterized in that the long symmetry axis of the rectangular diaphragm (6) and the equidistant rectangular diaphragm (9) is in the same direction with the axial meridian of the second cylindrical concave lens (7), the second cylindrical convex lens (8), the third cylindrical convex lens (10), the third cylindrical concave lens (11) and the fourth cylindrical concave lens (12), and the direction is two-by-two perpendicular to the emission direction of the detection beam laser (1) and the symmetry axis direction of the symmetric cavitation bubble (17) to be detected.
4. The apparatus for detecting symmetric cavitation dynamics in transparent liquid environment according to claim 1 is characterized in that the length of the rectangular diaphragm (6) is longer than the length of the equally spaced rectangular diaphragm (9).
5. The apparatus for detecting symmetric cavitation dynamics in transparent liquid environment according to claim 1 is characterized in that the probe beam laser (1) employs He-Ne laser whose light intensity distribution is gaussian.
6. The apparatus according to claim 5, wherein the He-Ne laser has a wavelength of 632.8nm and a spot diameter of 2 mm.
7. The method for detecting the symmetric cavitation dynamics in the transparent liquid environment based on the detection device of any one of claims 1 to 6, characterized by comprising the following steps:
step 1, expanding a detection beam generated by a detection beam laser (1) by m times by using a beam expander (2);
step 2, adjusting each optical device to enable the detection beam laser (1), the beam expander (2), the first cylindrical concave lens (3), the adjustable optical slit (4), the first cylindrical convex lens (5), the rectangular diaphragm (6), the second cylindrical concave lens (7), the second cylindrical convex lens (8), the equidistant rectangular diaphragm (9), the third cylindrical convex lens (10), the third cylindrical concave lens (11) and the fourth cylindrical concave lens (12) to be coaxial and equal in height, and adjusting the adjustable optical slit (4) to be the largest in gap;
step 3, adjusting the distance between the first cylindrical concave lens (3) and the first cylindrical convex lens (5), enabling the detection light beam passing through the first cylindrical convex lens (5) to be parallel light beams, and enabling the beam expanding effect of the combination of the first cylindrical concave lens (3) and the first cylindrical convex lens (5) on the direction of the refractive power meridian of the light beam in the first cylindrical concave lens (3) and the first cylindrical convex lens (5) to be not less than 10 times;
step 4, narrowing the gap width of the adjustable optical slit (4) until the detection light beam reaching the first cylindrical convex lens (5) after passing through the adjustable optical slit (4) does not exceed the effective focal plane of the first cylindrical convex lens (5), so that the detection light beam passing through the rectangular diaphragm (6) is adjusted into a linear light beam with uniform light intensity distribution;
step 5, adjusting the distance between the second cylindrical concave lens (7) and the second cylindrical convex lens (8), expanding the beam passing through the second cylindrical convex lens (8) in the direction of the refractive power meridian of the second cylindrical concave lens (7) and the second cylindrical convex lens (8) until the expanded detection beam covers all rectangular diaphragms of the equidistant rectangular diaphragms (9), and adjusting the detection beam passing through the equidistant rectangular diaphragms (9) into a row of parallel detection beams with uniform light intensity distribution;
step 6, adjusting the distance between the third cylindrical convex lens (10) and the third cylindrical concave lens (11) to ensure that the row-shaped parallel detection beams passing through the third cylindrical concave lens (11) are still parallel light and the detection area width l of the row-shaped parallel detection beams is larger than the axial maximum diameter of the detected symmetrical vacuole;
step 7, adjusting the positions of a lens group (13) for focusing the detection light beams and a photoelectric detector group (14) with an interference filter, so that each beam of detection light diffused by the fourth cylindrical concave lens (12) is respectively focused on a corresponding photoelectric detector in the photoelectric detector group (14) with the interference filter, and each signal voltage obtained by the oscillograph group (15) is maximum and is respectively marked as Vi(max)，i＝1,2,…,n；
Step 8, completely shielding the detection light beam, recording the signal voltage obtained on the oscillograph group (15) at the moment, and respectively recording the signal voltage as Vi(min)；
Step 9, generating a detected symmetrical cavity (17) in a container (16) which is provided with a transparent liquid and can transmit a detection light window by using a cavity generating device, ensuring that the center of the row-shaped parallel detection light beams passes through the generated position of the detected symmetrical cavity (17), enabling the symmetry axis of the detected symmetrical cavity (17) to be in the same direction as the gap central line of the adjustable optical slit (4), recording the waveforms of the electric signals displayed in the oscillograph group (15) at the moment, and respectively recording the waveforms as Vi(t)；
And step 10, taking the generating position of the detected symmetrical cavity (17) as a coordinate origin o, the symmetrical axis of the detected symmetrical cavity (17) as an x axis, and the long symmetrical axis of the rectangular diaphragm (6) as a y axis, establishing a spatial variation relation of each detection point in the xoy plane of the detection area, which is caused by the detected symmetrical cavity (17), and analyzing the spatial variation relation to obtain the dynamic behavior of the symmetrical cavity in the detection area.
8. The method for detecting symmetric cavitation dynamics in transparent liquid environment according to claim 7, wherein m is greater than or equal to 6 in step 1.
9. The method for detecting the dynamics of symmetric cavitation bubbles in transparent liquid environment according to claim 7, wherein the formula of the spatial variation relationship caused by the symmetric cavitation bubbles (17) to be detected at each detection point in the xoy plane of the detection area in the step 10 is as follows:
in the formula, f (x)i) Is the change of the coordinate Y of the vacuolar wall on the Y axis with time, xiAnd the abscissa of the ith detection point is, w and h are the width and the length of each rectangular diaphragm in the equidistant rectangular diaphragms (9), s is the distance between every two adjacent rectangular diaphragms, and l is the width of a detection area of the row-shaped parallel detection beams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987699.8A CN110618133B (en) | 2019-10-17 | 2019-10-17 | Device and method for detecting dynamics of symmetric vacuoles in transparent liquid environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987699.8A CN110618133B (en) | 2019-10-17 | 2019-10-17 | Device and method for detecting dynamics of symmetric vacuoles in transparent liquid environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110618133A true CN110618133A (en) | 2019-12-27 |
| CN110618133B CN110618133B (en) | 2022-01-18 |
Family
ID=68925994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910987699.8A Active CN110618133B (en) | 2019-10-17 | 2019-10-17 | Device and method for detecting dynamics of symmetric vacuoles in transparent liquid environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110618133B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736749A (en) * | 2019-10-17 | 2020-01-31 | 淮阴工学院 | Multipoint detection device and method for millimeter-scale vacuoles on fixed wall surface |
| CN112779156A (en) * | 2020-12-29 | 2021-05-11 | 西安交通大学 | Nanosecond pulse laser perforation system and method based on spatial light modulation technology |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322805A (en) * | 2011-08-26 | 2012-01-18 | 南京理工大学 | Detection device and detection method for maximum bubble radius of cavitating bubbles |
| CN104237124A (en) * | 2014-09-26 | 2014-12-24 | 南京理工大学 | Synchronous detection device and method for radius and period of millimeter-level cavitation on fixed wall surface |
| CN104237123A (en) * | 2014-09-26 | 2014-12-24 | 南京理工大学 | Synchronous detection device and method for radius and period of laser induced cavitation on fixed wall surface |
| CN108572233A (en) * | 2018-04-12 | 2018-09-25 | 西安交通大学 | A kind of apparatus and method regulating and controlling bubbling behaviour by a variety of external disturbance modes |
-
2019
- 2019-10-17 CN CN201910987699.8A patent/CN110618133B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322805A (en) * | 2011-08-26 | 2012-01-18 | 南京理工大学 | Detection device and detection method for maximum bubble radius of cavitating bubbles |
| CN104237124A (en) * | 2014-09-26 | 2014-12-24 | 南京理工大学 | Synchronous detection device and method for radius and period of millimeter-level cavitation on fixed wall surface |
| CN104237123A (en) * | 2014-09-26 | 2014-12-24 | 南京理工大学 | Synchronous detection device and method for radius and period of laser induced cavitation on fixed wall surface |
| CN108572233A (en) * | 2018-04-12 | 2018-09-25 | 西安交通大学 | A kind of apparatus and method regulating and controlling bubbling behaviour by a variety of external disturbance modes |
Non-Patent Citations (1)
| Title |
|---|
| JUNLI XUE 等: "Bubble Dynamics Measurements Using Four-Point", 《THE CANADIAN JOURNAL OF CHEMICAL ENGINEERING》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736749A (en) * | 2019-10-17 | 2020-01-31 | 淮阴工学院 | Multipoint detection device and method for millimeter-scale vacuoles on fixed wall surface |
| CN110736749B (en) * | 2019-10-17 | 2020-08-25 | 淮阴工学院 | Multipoint detection device and method for millimeter-scale vacuoles on fixed wall surface |
| CN112779156A (en) * | 2020-12-29 | 2021-05-11 | 西安交通大学 | Nanosecond pulse laser perforation system and method based on spatial light modulation technology |
| CN112779156B (en) * | 2020-12-29 | 2022-10-25 | 西安交通大学 | Nanosecond pulse laser perforation system and method based on spatial light modulation technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110618133B (en) | 2022-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102322805B (en) | Detection method for maximum bubble radius of cavitating bubbles | |
| CN110618133B (en) | Device and method for detecting dynamics of symmetric vacuoles in transparent liquid environment | |
| CN102579080B (en) | Integrated portable confocal opto-acoustic microscopy imaging device and method | |
| CN104198055A (en) | Wave surface detecting device | |
| US9574946B2 (en) | Spatiotemporally resolved far-field pulse contrast measuring method and device | |
| Köstli et al. | Optoacoustic tomography: time-gated measurement of pressure distributions and image reconstruction | |
| CN104237123B (en) | The synchronizing detection device and method in laser-induced cavity radius and cycle on solid-surface | |
| CN109682759B (en) | Laser ultrasonic excitation and detection system and method for realizing ultrasonic fast scanning and fixed point focusing | |
| CN110736749B (en) | Multipoint detection device and method for millimeter-scale vacuoles on fixed wall surface | |
| Kim et al. | Modulations of a weak shock wave through a turbulent slit jet | |
| CN113504182A (en) | Object surface crack online detection method based on laser surface acoustic wave | |
| CN104237124B (en) | The synchronizing detection device and method in grade cavity radius and cycle on solid-surface | |
| Kompenhans et al. | 2-D flow field measurements in wind tunnels by means of particle image velocimetry | |
| CN211651529U (en) | Material deformation detecting system based on laser shot blasting | |
| Wu et al. | Pipeline degradation evaluation based on distributed fiber sensors and convolutional neural networks (CNNs) | |
| CN203216704U (en) | Wavefront measuring device of optical system | |
| CN112730333A (en) | Detection method and detection equipment for coated optical lens | |
| Zavyalov et al. | A structured-light method for the measurement of deformations in fuel assemblies in the cooling ponds of nuclear power plants | |
| CN215375245U (en) | Laser ultrasonic non-contact nondestructive testing device | |
| Rebow et al. | Experimental validation of BEM code analysis of bubble splitting in a tip vortex flow | |
| CN109187435B (en) | Backward scattering test method for polarization characteristic of wake flow bubbles | |
| Weichselbaum et al. | Single Camera PIV/Shadowgraphy and Laser Delivery on Earthquake Shake Table for Fluid-Structure Interaction Measurements | |
| Ming et al. | Three-dimensional particle localization method based on single light field camera | |
| Li et al. | Simulation of vignetting effect in thermal imaging system | |
| CN115524239A (en) | Cylindrical surface RM instability disturbance growth material strength measurement experiment system and method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |