CN108036210A - The production method of single bubble sonoluminescence device and light-emitting device - Google Patents

Abstract

The invention provides a single-bubble sonoluminescence device and a method for manufacturing the light-emitting device, which are used to solve the problem in the prior art that, on the one hand, it is difficult to find the center of symmetry of the piezoelectric ceramic sheet; on the other hand, the planar ceramic sheet and The contact surface of the spherical flask is very small, which is not conducive to the generation of sound waves by the transducer and the propagation of sound waves in the flask. It is not conducive to the formation of a stable standing wave field, which seriously affects the experiment. It will be difficult to adjust the parameters, and it is difficult to observe the luminescence. The luminous time is short and the experiment repeatability is very poor. A single-bubble sonoluminescence device, comprising: a water container, the water container is provided with a containing part, the containing part has an arc-shaped outer wall, and the containing part is a light-transmitting structure; a piezoelectric ceramic sheet, the piezoelectric There are two ceramic sheets, and one side of the two piezoelectric ceramic sheets is provided with a concave surface, and the two concave surfaces face the accommodating part and are arranged oppositely, and the curvature of the concave surface matches the curvature of the arc-shaped outer wall . Conducive to the formation of a stable standing wave field.

Description

Single-bubble sonoluminescence device and method for manufacturing the same

technical field

The invention relates to the field of single-bubble sonoluminescence, in particular to a single-bubble sonoluminescence device and a manufacturing method of the light-emitting device.

Background technique

A single bubble trapped in the antinode of the sound pressure by the sound pressure in water can periodically emit light pulses with a width of 50ps to 140ps. This phenomenon is called single-bubble sonoluminescence (SBSL). In 1990, Gaitan et al. realized single-bubble sonoluminescence by injecting bubbles in highly degassed pure water. It is a stable, spatially positioned, time-synchronized bubble pulsation luminescence process. . Since the discovery of single-bubble sonoluminescence, it has been one of the hot topics in the field of acoustics and physics. The research results show that the cavitation bubble rapidly collapses from the largest radius (50 μm) until it emits light, and the energy density increases by 1012 orders of magnitude. , forming a high temperature of tens of thousands of degrees and a high pressure of thousands of atmospheres in the bubble. Therefore, this small luminescent cavitation bubble has become a magical experiment for acoustics, fluid mechanics, quantum optics, acoustic nuclear fusion and life sciences under extreme conditions. ; In 2002, "Science" published the article "Evidence of Nuclear Radiation During Acoustic Cavitation" by the Oak Ridge National Laboratory of the United States, which aroused the attention and controversy of the international scientific community. At present, the research on sonoluminescence has entered the quantitative stage from qualitative analysis, and many studies have been carried out on the parameter correlation of sonoluminescence and the sound field of ultrasonic transducers.

To achieve stable single-bubble sonoluminescence, a stable standing wave field must be formed in the resonator, and then the ultrasonic levitation of the bubbles must be formed. The so-called ultrasonic levitation is to use the Bjerknes force to attract the bubbles at the amplitude of the standing wave field. It can be seen that in single-bubble sonoluminescence, the ultrasonic wave not only provides energy to the cavitation bubble, but also requires matching with the resonator to form a stable standing wave field. At present, the typical experimental device of single-bubble sonoluminescence is made of glass spherical flask. The method is to paste two emitting piezoelectric ceramic discs with the same size and performance on the two ends of the center of the flask symmetrically to form a resident in the glass flask. The wave field, the center of the flask is the antinode of the sound pressure, and the bubbles periodically expand, collapse and rebound under the action of the sound pressure, which is an important experimental device in this experiment. At present, this device has relatively large technical problems. First, it is difficult to find the center of symmetry of the glass; second, the contact surface between the flat ceramic sheet and the spherical flask is very small, which is very unfavorable for the transducer to generate sound waves and the sound waves in the flask. Propagation is not conducive to the formation of a stable standing wave field, which seriously affects the experiment. There will be problems such as difficulty in parameter adjustment, difficulty in observing luminescence, short luminescence time, and poor experiment repeatability.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a single-bubble sonoluminescence device and a method for manufacturing the light-emitting device, which are used to solve the problems in the prior art. On the one hand, the center of symmetry of the piezoelectric ceramic sheet is very small Difficult to find out; on the other hand, the contact surface between the flat ceramic sheet and the spherical flask is very small, which is not conducive to the generation of sound waves by the transducer and the propagation of sound waves in the flask, and is not conducive to the formation of a stable standing wave field, which seriously affects the experiment. There will be problems such as difficulty in parameter adjustment, difficulty in observing luminescence, short luminescence time, and poor experimental repeatability.

To achieve the above and other related purposes, the present invention provides a single-bubble sonoluminescence device, comprising:

A water container, the water container is provided with a containing part, the containing part has an arc-shaped outer wall, and the containing part is a light-transmitting structure;

There are two piezoelectric ceramic sheets, and one side of the two piezoelectric ceramic sheets is provided with a concave surface, and the two concave surfaces face the accommodating part and are oppositely arranged, and the curvature of the concave surface is It matches the radian of the arc-shaped outer wall.

When in use, the other components of the transducer are welded to the positive and negative electrodes of the piezoelectric ceramic sheet, and the concave structure cooperates with the arc-shaped outer wall of the housing to form a stable and single standing wave field, which is conducive to experimental observation and analysis.

Preferably, the other side of the piezoelectric ceramic sheet is provided with a convex surface, and the thickness of the piezoelectric ceramic sheet is uniform.

Preferably, the wall thickness of the joint between the receiving portion and the piezoelectric ceramic sheet is uniform.

It is conducive to the transmission of sound waves and the formation of a stable and single standing wave field, which is convenient for experimental observation.

Preferably, the accommodating portion is a transparent structure.

Preferably, the accommodating part is a glass structure.

Preferably, when the accommodating portion is a columnar structure, the concave surface is a C-shaped arc surface, and when the accommodating portion is a spherical structure, the concave surface is a spherical concave structure.

It is convenient to observe the luminescence in the containing part, and the arc structures of the two modes are matched, and both can form a stable standing wave field. Preferably, the piezoelectric ceramic sheet is adhered to the outer wall of the accommodating portion.

Manufactured separately and then assembled together, the assembly is convenient, and when bonding, and the contact area is large, it is easier to form a stable standing wave.

A method for manufacturing a light emitting device, comprising the steps of:

S1, mark the installation position;

S2, bonding the piezoelectric ceramic sheet to the marked installation position;

S3, using an auxiliary tool to keep the piezoelectric ceramic sheet and the water container relatively fixed until the adhesive is immobilized.

Mark the position and then install. Since the receiving part is spherical, the mark is more accurate and not easy to shift, which ensures the accuracy of the installation of the two piezoelectric ceramic pieces and ensures the formation of a stable standing wave field.

Preferably, in the S1 step:

S11, mark two center points respectively, and the two center points are symmetrical on the accommodating part (b1);

S12, draw a circular mark with the center point as the center, the diameter of the circular mark is equal to the diameter of the concave opening;

In said S2 step:

Align and bond the concave surface of the piezoelectric ceramic sheet to the circular mark.

Through the alignment of the circular mark and the concave surface, it can be referenced in real time during bonding, ensuring that the two piezoceramics are facing each other.

Preferably, the auxiliary tooling includes:

A base, the upper end surface of the base is provided with a water container placement part;

a guide track, the guide track is a straight line structure and is arranged on the base;

The first slider and the second slider, the first slider and the second slider can move relative to each other along the same line on the guide rail or move towards each other and can be locked, the first slider and the second slider can be locked. The second sliders are provided with pressing pieces, the two pressing pieces are on the same horizontal line, and the two pressing pieces are located on both sides of the water container placement part;

In said S3 step:

The water container is placed on the water container placement part, and the two pressing parts press the piezoelectric ceramic sheet on the water container.

Auxiliary tooling is used to keep the water container and the piezoelectric ceramic sheet fixed, which can be pressed in a straight line to avoid the displacement of the piezoelectric ceramic sheet, and the water container is placed on the water container placement part to achieve effective positioning. During assembly, install The accuracy is improved, and it is fast and convenient, and at the same time, it also ensures the stability of the generated standing wave field.

Preferably, the linear movement of the first slider and the second slider is regulated by a screw mechanism.

The adjustment of the screw mechanism has a simple structure and is easy to operate.

As mentioned above, the single-bubble sonoluminescence device and the manufacturing method of the light-emitting device of the present invention have the following beneficial effects: by changing the design of the piezoelectric ceramic sheet, the planar piezoelectric ceramic sheet is designed as a spherical surface with the same diameter as the water container. For the electric ceramic sheet, since the piezoelectric element is a spherical surface with the same size as the water container, the sound wave generated by the transducer can easily form a stable standing wave field in the water container, and it is easy to select the working frequency and adjust the sound pressure in the experiment. Due to the optimization of the experimental device, the stable time of the formed single bubble luminescence lasts longer, which is conducive to the development of the experiment.

Description of drawings

FIG. 1 is a schematic diagram of Embodiment 1 of the piezoelectric ceramic sheet a of the present invention.

FIG. 2 is a schematic diagram of Embodiment 1 of the single-bubble sonoluminescence device of the present invention.

FIG. 3 is a schematic diagram of Embodiment 2 of the single-bubble sonoluminescence device of the present invention.

FIG. 4 is a schematic flowchart of a method for fabricating a light-emitting device.

Figure 5 shows a schematic structural view of the auxiliary tooling.

Fig. 6 shows a schematic diagram of making a light emitting device for an auxiliary tool.

Figure 7 shows a schematic view of the pressing member.

Detailed ways

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

See Figures 1 through 7. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so there is no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should still fall within the scope of the present invention. The disclosed technical content must be within the scope covered.

Embodiment 1 of a single-bubble sonoluminescence device, please refer to FIG. 2 , the present invention provides a single-bubble sonoluminescence device, which includes a water container b and a piezoelectric ceramic sheet a, and the water container b is provided with an accommodating portion b1, the accommodating part b1 is a light-transmitting structure, and the wall thickness of the accommodating part b1 is equal everywhere; the accommodating part b1 is a transparent structure, which is convenient for observing the situation in the water container b, preferably the water container b for the flask.

Further, please refer to Fig. 1 and Fig. 2, there are two piezoelectric ceramic sheets a, and the two piezoelectric ceramic sheets a are arranged opposite to each other on both sides of the outer wall of the accommodating portion b1, and the piezoelectric ceramic sheets a It is glued on the outer wall of the accommodating part b1. The front surface of the piezoelectric ceramic sheet a is a concave surface a1, the reverse surface of the piezoelectric ceramic sheet a is a convex surface a2, and the wall thickness between the concave surface a1 and the convex surface a2 is equal everywhere. The piezoelectric ceramic sheet a is in close contact with the outer wall of the accommodating portion b1.

The second embodiment of a single-bubble sonoluminescence device, please refer to Figure 3, the outer wall of the accommodating part b1 of the water container b is a cylindrical structure, the piezoelectric ceramic sheet a is a C-shaped structure, and the concave surface a1 of the piezoelectric ceramic sheet a It is in close contact with the outer wall of the accommodating portion b1 and pasted on the outer wall of the accommodating portion b1.

Please refer to Fig. 4, a method for manufacturing a light emitting device, including the following steps:

S1, mark the installation position;

S11, mark two center points respectively, and the two center points are symmetrical on the accommodating part (b1);

S12, draw a circular mark with the center point as the center, the diameter of the circular mark is equal to the diameter of the opening of the concave surface a1;

S2, bonding the piezoelectric ceramic sheet a to the installation position of the mark, aligning and bonding the concave surface a1 of the piezoelectric ceramic sheet a to the circular mark;

S3, using an auxiliary tool to keep the piezoelectric ceramic sheet a and the water container b relatively fixed until the adhesive is immobilized.

Please refer to Figures 5 to 7, the auxiliary tooling includes: a base 1, a guide rail 2, a first slider 31 and a second slider 32, the upper end of the base 1 is provided with a water container placement part 11; The guide rail 2 is a linear structure and is arranged on the base 1; the first slider 31 and the second slider 32 can move relative to each other along the same straight line or move toward each other on the guide rail 2 and can be locked , the first slider 31 and the second slider 32 are provided with pressing pieces 4, the two pressing pieces 4 are on the same horizontal line, and the two pressing pieces 4 are located on the On both sides of the water container placement part 11, the pressing member 4 is made of rubber, and the pressing member 4 is a sleeve structure.

The water container b is placed on the water container placing part 11, and the two pressing members 4 press the piezoelectric ceramic sheet a on the water container b. The linear movement of the first slider 31 and the second slider 32 is adjusted by the screw mechanism 5 . The screw mechanism 5 includes a support 51, a threaded rod 52 and a control member 53, the control member 53 is a hand wheel, the control member 53 controls the rotation of the threaded rod 52, and the support 51 is located on the threaded The middle part of the rod 52, the threaded rod 52 passes through the first slider 31 and the support 51 in sequence and the axial displacement of the threaded rod 52 is limited; one end of the threaded rod 52 is provided with a forward spiral The other end of the threaded part 521 is provided with a reverse helical threaded part 522, the forward helical threaded part 521 and the first slider 31 are threadedly fitted, and the reverse helical threaded part 522 and the second slider 32 by thread fit

When installing a piezoelectric ceramic sheet a with a concave surface a1 and a convex surface a2 on the other side, and the housing part b1, first install the housing part b1 with the piezoelectric ceramic wafer a attached to the groove of the flask placement part 11 of the base 1 The wall is on the groove structure of a spherical surface, and then the hand wheel is turned clockwise to drive the threaded rod 52. The two ends of the threaded rod 52 have positive and negative threads with opposite rotation directions respectively, and the first slider 31 and the second slider are driven by the positive and negative threads. The second slide block 32 slides inwardly, and the support member 41 is housed on the slide block, and then the pressing member 4 is put on the support member 41. The pressing member 4 is a sleeve structure or is provided with a piezoelectric ceramic positioning groove 111, and the piezoelectric ceramic The convex surface a2 of piece a sinks into the sleeve structure of the pressing part 4 or the positioning groove 111 of the piezoelectric ceramic, that is, the slider can drive the two pressing parts 4 to move inward to the position of the accommodating part b1 to clamp the piezoelectric The ceramic sheet a can play a centering and clamping role by adopting an appropriate strength, and keep it in the clamping state for 24 hours until the adhesive is completely cured, so that the piezoelectric ceramic sheet a can be pasted on the symmetrical center of the accommodating part b1 superior.

In summary, the present invention not only improves the structure of the piezoelectric ceramic sheet a, makes the standing wave field generated by it more single and stable, but also improves its manufacturing method, reduces errors in the manufacturing process, and further ensures performance of light emitting devices. By changing the design of the piezoelectric ceramic sheet a, the planar piezoelectric ceramic sheet is designed as a spherical piezoelectric ceramic sheet with the same curvature radius as the water container. Since the piezoelectric element is a spherical surface with the same curvature radius as the water container, the transducer produces It is easy for the sound wave to form a stable standing wave field in the water container, and it is easy to select the working frequency and adjust the sound pressure in the experiment. Due to the optimization of the experimental device, the stable time of the formed single bubble luminescence lasts longer, which is conducive to the development of the experiment. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. A kind of 1. single bubble sonoluminescence device, it is characterised in that including：

   Water container (b), the water container (b) are equipped with receiving portion (b1), and described accommodation section (b1) has arc outer wall, the receiving Portion (b1) is translucent construction；

   Piezoelectric ceramic piece (a), the piezoelectric ceramic piece (a) have two, and the one sides of two piezoelectric ceramic pieces (a) is equipped with recessed Face (a1), two concave surfaces (a1) are set towards described accommodation section (b1) and face, the radian of the concave surface (a1) and described The radian matching of arc outer wall.
2. 2. single bubble sonoluminescence device according to claim 1, it is characterised in that：Piezoelectric ceramic piece (a) another side It is uniform equipped with convex surface (a2), the thickness of the piezoelectric ceramic piece (a).
3. 3. single bubble sonoluminescence device according to claim 1, it is characterised in that：Described accommodation section (b1) and the piezoelectricity Uniform wall thickness at potsherd (a) cooperation.
4. 4. single bubble sonoluminescence device according to claim 1, it is characterised in that：Described accommodation section (b1) is transparent knot Structure.
5. 5. single bubble sonoluminescence device according to claim 1, it is characterised in that：Described accommodation section (b1) is glass knot Structure.
6. 6. single bubble sonoluminescence device according to claim 1, it is characterised in that：When described accommodation section (b1) is column knot During structure, the concave surface (a1) is c-type cambered surface, and when described accommodation section (b1) is chondritic, the concave surface (a1) is recessed for sphere Fall into structure.
7. 7. single bubble sonoluminescence device according to claim 1, it is characterised in that：The piezoelectric ceramic piece (a) is bonded in On the outer wall of described accommodation section (b1).
8. 8. a kind of production method of light-emitting device as claimed in claim 1, it is characterised in that include the following steps：

   S1, mark installment position；

   Piezoelectric ceramic piece (a), is bonded in the installed position of mark by S2；

   S3, the piezoelectric ceramic piece (a) and the water container (b) are kept being relatively fixed, treat that bonding agent is fixed with auxiliary mould Change.
9. 9. the production method of light-emitting device according to claim 8, it is characterised in that：

   In the S1 steps：

   S11, two central points of mark, two central points are symmetrical on described accommodation section (b1) respectively；

   S12, circular mark, the diameter and the concave surface (a1) opening diameter phase of the circular mark are drawn by the center of circle of central point Deng；

   In the S2 steps：

   By the concave surface (a1) of the piezoelectric ceramic piece (a) and the circular label alignment bonding.
10. 10. the production method of light-emitting device according to claim 8, it is characterised in that：The auxiliary mould includes：

    Base (1), the upper surface of the base (1) are equipped with water container placement section (11)；

    Guide rail (2), the guide rail (2) is linear structure and is arranged on the base (1)；

    First sliding block (31) and the second sliding block (32), first sliding block (31) and second sliding block (32) can be in the guiding Along same relative linear motion or move toward one another and can lock on track (2), first sliding block (31) and described second slides Be equipped with compressing member (4) on block (32), two compressing members (4) in the same horizontal line, and two compressing member (4) positions In the both sides of the water container placement section (11)；

    In the S3 steps：

    The water container (b) is placed on the water container placement section (11), two compressing members (4) make pottery the piezoelectricity Tile (a) is pressed on the water container (b).