A device and method for driving a liquid in circulation by means of laser light and detecting acoustic signals

Abstract

The application relates to the technical field of light-controlled flow and acoustic communication, and discloses a device and a method for driving liquid ring flow by laser and detecting acoustic signals, which comprises a horizontally arranged annular cavity, the annular cavity extends along a tangent direction and has a straight cavity; a metal substrate is arranged on the outer wall of the annular cavity at the intersection of the annular cavity and the straight cavity; the metal substrate is used for receiving laser energy and generating power for driving the flow of liquid in the annular cavity and the straight cavity; and an acoustic transducer connecting port is arranged at the end of the straight cavity away from the annular cavity. The application changes the flow path of the liquid by arranging the annular cavity, realizes long-range and stable rotation ring flow of the liquid driven by the laser, and simultaneously monitors and measures acoustic signals without affecting the rotation of the liquid by arranging the straight cavity connected with the annular cavity and used for mounting the acoustic transducer connecting port.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of light-controlled flow technology, in particular to a device and method for driving liquid circulation and detecting acoustic signals by laser. BACKGROUND

[0002] Light-controlled flow technology has a large number of applications in microfluidic systems, biological and chemical basic research, and medical devices. Using light to drive fluid has the advantages of no energy loss, no contact and no pollution, and easy accurate control in time and space. Since photons have linear momentum and mechanical energy, laser has been widely used in this field due to its high intensity, high directionality and monochromaticity. The transfer of laser momentum to fluid and the efficient and accurate control of fluid have been the focus of research in recent decades. There are mainly four methods to achieve light-controlled flow at present:

[0003] Light momentum driving. The light momentum is used to produce deformation and control the fluid. Laser beam is irradiated on the interface of two liquids with different refractive indices and mutually insoluble, and the optical radiation pressure is generated to cause the liquid surface distortion between the two liquid surfaces, that is, the interface is distorted towards the side with lower refractive index. Optical tweezers technology is also one of them. However, this technology can only be applied to the micro world.

[0004] Photothermal driving. The photothermal effect is used to locally change the surface tension of the liquid surface to control the fluid. When the laser is irradiated on the interface of two liquids, the temperature of the irradiated part increases, and the temperature increase will cause the density of liquid molecules to decrease, thereby causing a significant difference in the surface tension of the two liquid surfaces, and forming a surface tension difference gradient, which causes the liquid to flow from the place with high surface tension to the place with low surface tension, forming the Marangoni effect. However, this technology has high requirements for the liquid.

[0005] Light modulated voltage driving fluid. A charged small droplet is attached to the electrode covered with an optically conductive medium by integrating photoconductive material under the electrowetting electrode, and by changing the irradiation of the laser, the conductivity of the medium itself will change, thereby causing the change of potential difference to make the attachment angle of the small droplet smaller, which can drive the droplet to move. However, this technology produces small power.

[0006] Photo-induced ultrasonic driving fluid movement. In 2017, Wang et al. by shining a 527 nm pulsed laser into a cuvette filled with gold nanosol solution, focusing the laser on the front surface of the cuvette, after a few minutes or ten minutes of processing time, a strong linear jet can be observed on the laser-incident cuvette surface by a CCD camera. The four walls of the cuvette are injected with gold nanoparticles or the glass substrate plated with a layer of gold nanoparticles is attached to the four walls of the cuvette, and a strong linear jet can also be generated at the laser-incident place. This is because gold has an absorption peak near 527 nm, when the laser with a wavelength near the absorption peak on the metal spectrum is irradiated on the metal, surface plasmon resonance effect occurs, a large amount of laser is absorbed and then partially converted into ultrasonic waves, then the fluid is pushed to do directional motion perpendicular to the surface of the cuvette. The ultrasonic signal detector placed in the solution also successfully detects the ultrasonic signal. However, this technology only achieves linear motion of the jet.

[0007] Therefore, the present application is proposed. SUMMARY

[0008] The existing technology has the problem that the current laser-driven fluid can only produce linear motion. The present application provides a device and method for laser-driven liquid circular flow and acoustic signal detection, which can convert linear motion driven by laser into circular motion, and can also realize rotation of the laser-driven fluid in different directions by adjusting the laser incident position, and detect the acoustic signal in different fluid rotation states.

[0009] The present application is realized by the following technical solutions:

[0010] In a first aspect, the present application provides a device for laser-driven liquid circular flow and acoustic signal detection, comprising a horizontally arranged annular cavity, wherein the annular cavity extends along a tangent direction and has a linear cavity.

[0011] A metal substrate is arranged on the outer wall of the annular cavity at the intersection of the annular cavity and the linear cavity.

[0012] The metal substrate is used to accept laser energy and generate driving power for the liquid flow in the annular cavity and the linear cavity.

[0013] An acoustic transducer connecting port is arranged at the end of the linear cavity away from the annular cavity.

[0014] The present application converts the flow path of the liquid by arranging the annular cavity, realizes long-range and stable rotation of the laser-driven liquid, and at the same time arranges the linear cavity connected to the annular cavity for mounting the acoustic transducer connecting port, which can monitor and measure the acoustic signal without affecting the rotation of the liquid.

[0015] In a specific embodiment, the device is provided with a laser incidence window extending to the metal substrate.

[0016] In a specific embodiment, the two straight cavities extend along the tangent direction on both sides of the annular cavity, and the two straight cavities are located on the same side of the annular cavity.

[0017] The outer wall at the intersection of the annular cavity and the two straight cavities is provided with a metal substrate.

[0018] The present application provides two metal substrates, so that when the two metal substrates are irradiated from two directions respectively, the liquid can produce different rotation directions. The device is provided with metal substrates on both sides, and when the right metal substrate is irradiated by laser, the rotation direction of the fluid in the annular cavity is clockwise; when the left metal substrate is irradiated by laser, the rotation direction of the fluid in the annular cavity is counterclockwise; thereby realizing control of fluid rotation in two directions by one device.

[0019] The control source of the device is only laser, the control source is single, the control precision is high, and any other physical field does not need to be added, the requirement for experimental environment construction is low. The few control sources also lead to the result not affected by other redundant conditions, and only related to the laser power, so the controllability is strong.

[0020] The device drives the liquid to rotate, and the liquid is non-contact, without any external rotating shaft, wire connection, etc. The laser source can also be remotely controlled, without direct contact with the device, and the flexibility is higher.

[0021] Among them, the two acoustic transducer connection ports are relatively close to the two metal substrates, and usually only one side of the metal substrate is used as a driving source, at this time the acoustic transducers installed at the two acoustic transducer connection ports will become proximal and distal, respectively, for measuring the sound signal conditions at different positions.

[0022] In a specific embodiment, the metal substrate is a quartz substrate into which gold ions are injected.

[0023] In a specific embodiment, the metal substrate is a glass substrate plated with a gold layer.

[0024] In a specific embodiment, the thickness of the gold layer is 200-500 nm.

[0025] The gold nanoparticles in the metal substrate are used to convert the energy of the laser to drive the fluid to move.

[0026] In a specific embodiment, the device further comprises a laser and a convex lens arranged between the laser and the laser incidence window.

[0027] In a specific embodiment, the cross section of the annular cavity and the straight cavity is in a rectangular structure, a circular structure, a trapezoidal structure or a triangular structure, etc. The annular cavity and the straight cavity of the present application provide a flow path for the liquid, and thus the shape of the cross section is not limited to the above shapes, as long as it does not generate a large resistance to the flow of the liquid.

[0028] In a specific embodiment, an acoustic transducer is installed at the acoustic transducer connection port.

[0029] In a second aspect, the present application provides a method for driving liquid circulation by laser and detecting acoustic signals, comprising the following steps:

[0030] (1) The annular cavity and the straight cavity are filled with liquid, which can be selected from deionized water or gold nanoparticle solution, to reduce the influence of irrelevant factors on the analysis;

[0031] (2) The light emitted by the laser is focused by a convex lens and then irradiated on the metal substrate of the laser incident window on one side;

[0032] (3) The metal substrate converts the laser energy to drive the liquid to flow vertically along the wall;

[0033] (4) When the liquid flows in the annular cavity, due to the existence of curvature, the liquid is subjected to a large resistance, and thus a small part of the liquid enters the curved channel of the annular cavity and the straight cavity for acoustic signal transmission, but at this time the small part of the liquid is difficult to cause large flow, and most of the liquid returns to the metal substrate, and the returned liquid is again driven by the laser energy at the metal substrate to form a vortex, which drives the liquid in the annular cavity to flow to form an overall circulation.

[0034] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0035] 1. The device and method for driving liquid circulation by laser and detecting acoustic signals provided by the embodiment of the present application change the flow path of the liquid by setting an annular cavity, realize long-range and stable rotation circulation of the liquid driven by laser, and set a straight cavity connected to the annular cavity for installing an acoustic transducer connection port, so that the acoustic signal can be monitored and measured without affecting the rotation of the liquid;

[0036] 2. The device and method for driving liquid circulation by laser and detecting acoustic signals provided by the embodiment of the present application set two metal substrates, so that when the two metal substrates are irradiated from two directions respectively, the liquid can produce different rotation directions, the rotation direction of the fluid in the annular cavity is clockwise when the right metal substrate is irradiated by laser, and the rotation direction of the fluid in the annular cavity is counterclockwise when the left metal substrate is irradiated by laser, so that one device can control the rotation of the fluid in two directions;

[0037] 3. The device and method for driving liquid circulation and detecting acoustic signals by laser provided by the embodiment of the present application, the control source is only laser, the control source is single, the control precision is higher, and no other physical field needs to be added, and the requirement for experimental environment construction is low. The few control sources also result in that the result is not affected by other redundant conditions, and is strictly related to laser power, and controllability is strong;

[0038] 4. The device and method for driving liquid circulation and detecting acoustic signals by laser provided by the embodiment of the present application, the liquid is driven to rotate, and the liquid is non-contact, and no external rotating shaft, wire and the like need to be connected, the laser source can also be remotely controlled, and is not directly contacted with the device, and flexibility is higher;

[0039] 5. The device and method for driving liquid circulation and detecting acoustic signals by laser provided by the embodiment of the present application, the device structure is simple, the annular cavity is composed of regular structures, is easy to process and realize, and traditional processes can meet the processing and production conditions, and the application cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation to the scope, and other related drawings can also be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0041] Figure 1 The device structure top view for driving liquid circulation and detecting acoustic signals by laser provided by the embodiment of the present application;

[0042] Figure 2 The device structure front view for driving liquid circulation and detecting acoustic signals by laser provided by the embodiment of the present application;

[0043] Figure 3 The device structure side view for driving liquid circulation and detecting acoustic signals by laser provided by the embodiment of the present application;

[0044] Figure 4 The liquid flow schematic diagram for driving liquid circulation provided by the embodiment of the present application.

[0045] The marks in the drawings and the corresponding names of parts:

[0046] 1-annular cavity, 2-linear cavity, 3-metal substrate, 4-acoustic transducer connecting port, 5-laser incidence window. DETAILED DESCRIPTION

[0047] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with embodiments and drawings, the illustrative embodiments and the description thereof are only used to explain the present application and not as limitation to the present application.

[0048] In the following description, a large number of specific details are set forth to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without these specific details. In other instances, well-known materials or methods have not been described in detail in order to avoid obscuring the present application.

[0049] Throughout the specification, reference to "one embodiment", "an embodiment", "one example" or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present application. The appearances of the phrases "in one embodiment", "an embodiment", "in one example" or "an example" in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable

[0050] Embodiment 1

[0051] As shown in Figures 1-3 Embodiments of the present application provide a device for driving liquid circulation by laser and detecting acoustic signals, which comprises a horizontal annular cavity 1, wherein a linear cavity 2 is arranged along the tangent direction of the annular cavity 1.

[0052] A metal substrate 3 is arranged on the outer wall of the annular cavity 1 at the intersection of the annular cavity 1 and the linear cavity 2.

[0053] The metal substrate 3 is used for receiving laser energy to generate power for driving the liquid flow in the annular cavity 1 and the linear cavity 2.

[0054] An acoustic transducer connecting port 4 is arranged at the end of the linear cavity 2 away from the annular cavity 1.

[0055] The present application converts the flow path of the liquid by arranging the annular cavity, realizes long-range and stable rotation circulation of the liquid driven by the laser, and at the same time, the linear cavity is arranged on the annular cavity for installing the acoustic transducer connecting port, which can monitor and measure the acoustic signals without affecting the rotation of the liquid.

[0056] In a specific embodiment, a laser incidence window 5 extending to the metal substrate 3 is arranged on the device.

[0057] In a specific embodiment, the two sides of the annular cavity 1 extend along the tangent direction with straight-line cavities 2, and the two straight-line cavities 2 are located on the same side of the annular cavity 1.

[0058] The outer wall at the intersection of the annular cavity 1 and the two straight-line cavities 2 is provided with a metal substrate 3.

[0059] The present application provides two metal substrates, so that when the two metal substrates are irradiated from two directions respectively, the liquid can produce different rotation directions. The two sides of the device are designed with metal substrates, and when the metal substrate on the right side of the laser is irradiated, the rotation direction of the fluid in the annular cavity is clockwise; when the metal substrate on the left side of the laser is irradiated, the rotation direction of the fluid in the annular cavity is counterclockwise; thereby realizing the control of the fluid rotation in two directions by one device.

[0060] The control source of the device is only laser, the control source is single, the control precision is high, and any other physical field does not need to be added, the requirement for experimental environment construction is low. The control source is also less, so that the result is not affected by other redundant conditions, and is strictly related to the laser power, and the controllability is high.

[0061] The device drives the liquid to rotate, and the liquid is non-contact, without any external rotating shaft, wire connection, etc. The laser source can also be remotely controlled, without direct contact with the device, and the flexibility is higher.

[0062] Among them, the two acoustic transducer connection ports are relatively close to the two metal substrates, and usually only one side of the metal substrate is used as a driving source, at this time the acoustic transducers installed at the two acoustic transducer connection ports will become proximal and distal, and are used to measure the sound signal conditions at different positions.

[0063] In a specific embodiment, the metal substrate 3 is a quartz substrate into which gold ions are injected.

[0064] In a specific embodiment, the metal substrate 3 is a glass substrate plated with a gold layer.

[0065] In a specific embodiment, the thickness of the gold layer is 200-500 nm.

[0066] The gold nanoparticles in the metal substrate are used to convert the energy of the laser to drive the fluid to move.

[0067] In a specific embodiment, the device further comprises a laser and a convex lens arranged between the laser and the laser incidence window 5.

[0068] In a specific embodiment, the cross section of the annular cavity and the linear cavity is in a rectangular structure, a circular structure, a trapezoidal structure or a triangular structure, etc. The annular cavity and the linear cavity provide a flow channel for the liquid, and thus the shape of the cross section is not limited to the above shapes, as long as the flow of the liquid is not greatly hindered.

[0069] In a specific embodiment, an acoustic transducer is installed at the acoustic transducer connecting port 4.

[0070] Embodiment 2

[0071] As shown in Figure 4 The embodiment of the present application provides a method for driving liquid annular flow and detecting acoustic signals by laser, which comprises the following steps:

[0072] (1) A liquid is filled in the annular cavity and the linear cavity, and the liquid can be selected as deionized water or gold nanoparticle solution to reduce the analysis of irrelevant factors, and an acoustic transducer is installed at the acoustic transducer connecting port;

[0073] (2) The light emitted by the laser is focused by a convex lens and irradiated on the metal substrate of the right laser incident window;

[0074] (3) The metal substrate converts the laser energy to drive the liquid to flow vertically along the wall;

[0075] (4) When the liquid flows in the annular cavity, the liquid is subjected to a large resistance due to the curvature, and thus a small part of the liquid enters the curved channel of the annular cavity and the linear cavity for acoustic signal transmission, but the small part of the liquid is difficult to cause large flow at this time, and most of the liquid returns to the metal substrate, and the returned liquid is again driven by the energy of the laser at the metal substrate to form a vortex, and the vortex drives the liquid in the annular cavity to flow clockwise to form an overall annular flow.

[0076] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An apparatus for driving a liquid in circulation by laser and detecting an acoustic signal, characterized by, The device comprises a horizontal annular cavity (1) which extends along a tangent direction with a straight cavity (2); A metal substrate (3) is arranged on the outer wall of the annular cavity (1) at the intersection of the annular cavity (1) and the straight cavity (2); The metal substrate (3) is used for receiving laser energy to generate power to drive the liquid flow in the annular cavity (1) and the straight cavity (2); An acoustic transducer connecting port (4) is arranged at the end of the straight cavity (2) away from the annular cavity (1); A laser incidence window (5) extending to the metal substrate (3) is arranged on the device; The device further comprises a laser and a convex lens arranged between the laser and the laser incidence window (5).

2. The apparatus according to claim 1, wherein the laser is a pulsed laser. Both sides of the annular cavity (1) extend along a tangent direction with a straight cavity (2), and the two straight cavities (2) are located on the same side of the annular cavity (1); A metal substrate (3) is arranged on the outer wall of the annular cavity (1) at the intersection of the annular cavity (1) and the two straight cavities (2).

3. The apparatus of claim 1, wherein the laser is configured to drive the liquid to circulate in a loop. The metal substrate (3) is a quartz substrate into which gold ions are injected.

4. The apparatus of claim 1, wherein the laser is configured to drive the liquid to circulate in a loop. The metal substrate (3) is a glass substrate plated with a gold layer.

5. The apparatus of claim 4, wherein the laser is configured to emit a laser beam having a wavelength of 532 nm. The thickness of the gold layer is 200-500 nm.

6. The apparatus of claim 1, wherein the laser is configured to drive the liquid to circulate in a loop. The cross section of the annular cavity (1) and the straight cavity (2) is in a rectangular structure, a circular structure, a trapezoidal structure or a triangular structure.

7. The apparatus of claim 1, wherein the laser is configured to drive the liquid to circulate in a loop. An acoustic transducer is installed at the acoustic transducer connecting port (4).

8. A method of driving a liquid in circulation and detecting acoustic signals by means of a laser according to any one of claims 1 to 7, characterized in that The device comprises the following steps: (1) filling the annular cavity and the straight cavity with liquid; (2) irradiating the light emitted by the laser on the metal substrate of the laser incidence window on one side; (3) the metal substrate converts the laser energy to push the liquid to flow linearly; (4) when the liquid flows into the annular cavity, it is resisted, a small part of the liquid enters the bend of the annular cavity, and most of the liquid returns to the metal substrate, the returned liquid is again pushed by the energy of the laser at the metal substrate to form a vortex, and the vortex drives the liquid in the annular cavity to flow to form an overall circular flow.

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