Device for flexibly testing loss of laser in liquid

Abstract

A device for flexibly testing loss of laser in liquid is characterized by comprising a laser (1), a cavity (2) and an integrating sphere (3), the cavity (2) is made of a transparent material on a light path of a light beam emitted by the laser (1); the cavity (2) comprises at least one adjustable cavity (6); the thickness of the adjustable cavity can be adjusted along a light path of a light beam emitted by the laser (1); and the integrating sphere (3) is positioned on a light path of a light beam emitted by the laser (1) so as to receive the light beam emitted by the laser (1) and detect the light power. According to the utility model, the convenience of measuring the laser loss of the liquid is greatly enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid light loss measurement, in particular to a device for flexibly testing laser loss in liquid. Background Art

[0002] The current status of the technology for measuring the loss of laser intensity in liquids involves many aspects, including the propagation characteristics of lasers in liquids and the loss mechanism of laser intensity in liquids.

[0003] Liquids have a smaller compressibility than air, which constrains the expansion of plasma, resulting in a short plasma lifetime and weak spectral radiation. When laser light propagates through liquids, it is affected by absorption, scattering, and refraction, which in turn affects the intensity of the laser.

[0004] Impurities, dissolved substances in the liquid, and factors such as the temperature and pressure of the liquid may affect the intensity loss of the laser. The flow state of the liquid may also affect the propagation and loss of the laser.

[0005] Current technology for measuring laser intensity loss in liquids still faces many challenges, such as accurately measuring laser intensity loss in liquids and evaluating the impact of various factors on this loss. The short lifetime and weak spectral radiation intensity of plasmas in liquids limit the application of direct laser penetration into liquids.

[0006] The application of laser-induced breakdown spectroscopy (LIBS) in liquids presents experimental complexities. For example, the impact of the plasma shock wave on the liquid surface can cause splashing and surface ripples, interfering with the stability of the plasma spectrum. Fluctuations in the liquid jet can also affect the accuracy of experimental results.

[0007] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of this application. Utility Model Content

[0008] To this end, the utility model provides a device for flexibly testing laser loss in liquid, which can conveniently and quantitatively test the loss coefficients of different wavelengths for the same liquid, and can also conveniently and quantitatively test the loss coefficients of the same wavelength for different liquids. It can also measure the loss coefficients of liquids of different thicknesses for the same wavelength, greatly enhancing the convenience of measuring the laser loss of liquid.

[0009] The utility model provides a device for flexibly testing laser loss in liquid, which is characterized by comprising: a laser (1), a cavity (2) and an integrating sphere (3);

[0010] The cavity (2) is made of a transparent material on the optical path of the light beam emitted by the laser (1);

[0011] The cavity (2) comprises at least one adjustable cavity (6); the adjustable cavity can adjust the thickness along the optical path of the light beam emitted by the laser (1);

[0012] The integrating sphere (3) is located on the optical path of the light beam emitted by the laser (1) to receive the light beam emitted by the laser (1) and detect the light power.

[0013] Optionally, the device for flexibly testing laser loss in liquid is characterized in that a stepping motor (12) is provided in the cavity (2) to adjust the thickness of the adjustable cavity (6).

[0014] Optionally, the device for flexibly testing laser loss in liquid is characterized in that it also includes an inlet (4) and an outlet (5); the inlet (4) is used to inject liquid into the adjustable cavity (6), and the outlet (5) is used to flow out the liquid in the adjustable cavity (6).

[0015] Optionally, the device for flexibly testing laser loss in liquid is characterized in that the inlet (4) is located above the cavity (2) and the outlet (5) is located below the cavity (2).

[0016] Optionally, the device for flexibly testing laser loss in liquid is characterized in that a circuit (7) and a driving component (8) are provided in the cavity (2) to enable the liquid to flow in the circuit (7).

[0017] Optionally, the device for flexibly testing laser loss in liquid is characterized in that the driving component (8) has different powers to make the liquid flow at different speeds.

[0018] Optionally, the device for flexibly testing laser loss in liquid is characterized in that the cross section of the loop (7) is circular.

[0019] Optionally, the device for flexibly testing laser loss in liquid is characterized by further comprising:

[0020] A tachometer (9) is used to measure the flow rate of the liquid in the circuit (7).

[0021] Optionally, the device for flexibly testing laser loss in liquid is characterized in that the tachometer (9) is arranged in the middle of the loop (7).

[0022] Optionally, the device for flexibly testing laser loss in liquid is characterized in that the laser (1) comprises:

[0023] a tunable laser (10) for emitting laser beams of different wavelengths;

[0024] A power supply (11) is used to supply power to the tunable laser (10).

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The utility model provides an adjustable cavity (6) on a cavity (2), which can adjust the thickness along the optical path of the light beam emitted by the laser (1), thereby adjusting the thickness of the liquid penetrated by the optical path, thereby quickly measuring the loss coefficient of water bodies of different thicknesses with the same wavelength.

[0027] The utility model utilizes an integrating sphere (3) for testing, thereby ensuring that the optical power accuracy is greatly improved.

[0028] The utility model can realize the testing of the loss coefficients of different wavelengths for the same water body and the loss coefficients of the same wavelength for different water bodies by using the same set of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without inventive work. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more apparent:

[0030] Figure 1 This is a schematic structural diagram of a device for flexibly testing laser loss in liquid according to an embodiment of the present utility model;

[0031] Figure 2 This is a schematic structural diagram of another device for flexibly testing laser loss in liquid according to an embodiment of the present utility model;

[0032] Figure 3 This is a schematic structural diagram of a cavity in an embodiment of the present utility model;

[0033] Figure 4 This is a schematic structural diagram of another cavity in an embodiment of the present utility model;

[0034] Figure 5This is a schematic structural diagram of another device for flexibly testing laser loss in liquid in an embodiment of the present utility model. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention. These modifications and improvements are all within the scope of protection of the present invention.

[0036] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products or apparatus.

[0037] The embodiment of the present utility model provides a device for flexibly testing laser loss in liquid, aiming to solve the problems existing in the prior art.

[0038] The following specific embodiments describe in detail the technical solution of the present invention and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following embodiments of the present invention are described in conjunction with the accompanying drawings.

[0039] Figure 1 This is a schematic diagram of the structure of a device for flexibly testing laser loss in liquid in an embodiment of the present utility model. Figure 1 As shown, in an embodiment of the utility model, a device for flexibly testing laser loss in liquid comprises: a laser (1), a cavity (2) and an integrating sphere (3).

[0040] The laser (1) is one of the core components of this embodiment and is responsible for emitting a light beam. This light beam will pass through the liquid in the cavity (2) to test the light loss characteristics of the liquid. The laser (1) generally has the characteristics of high stability, high power and high monochromaticity to ensure the accuracy and reliability of the test results. Depending on the test requirements, the laser (1) can be a continuous wave laser (1) or a pulsed laser (1). The continuous wave laser (1) provides a stable light beam and is suitable for long-term testing; the pulsed laser (1) provides a short and high-intensity light beam and is suitable for test scenarios that require a fast response.

[0041] The cavity (2) is made of a transparent material on the optical path of the light beam emitted by the laser (1). The cavity (2) includes at least one adjustable cavity (6); the adjustable cavity can adjust the thickness along the optical path of the light beam emitted by the laser (1).

[0042] Specifically, the cavity is made of a transparent material, such as glass or high-transmittance plastic, along the optical path of the laser beam, to ensure that the laser beam can pass through the cavity without damage. At least one adjustable cavity (6) is designed inside the cavity, and the adjustable cavity (6) can adjust the thickness along the optical path of the laser beam. This design allows the tester to adjust the transmission distance of the laser beam in the liquid as needed, thereby accurately measuring the loss of the laser in the liquid. The cavity not only serves as a transmission channel for the laser beam, but also accommodates the liquid sample to be tested. By adjusting the thickness of the adjustable cavity, the transmission path length of the laser beam in the liquid can be changed, thereby studying the loss of the laser in liquids of different thicknesses. The adjustable cavity can achieve precise thickness adjustment through a mechanical structure (such as a screw micrometer or a stepping motor). The adjustment mechanism should ensure that the transparency and sealing of the cavity are not affected during the adjustment process.

[0043] The integrating sphere (3) is located on the optical path of the light beam emitted by the laser (1) to receive the light beam emitted by the laser (1) and detect the light power.

[0044] Specifically, the integrating sphere (3) is located on the optical path of the light beam emitted by the laser (1) and is used to receive the light beam emitted by the laser (1) and detect the light power. The integrating sphere (3) is an optical element for collecting and homogenizing the light beam. The inside of the integrating sphere (3) is coated with a highly reflective material to ensure that the light beam is reflected multiple times inside the sphere, thereby achieving uniform distribution and measurement of the light power. When the light beam enters the integrating sphere (3), it will be reflected multiple times inside the sphere to form diffusely reflected light. By measuring the intensity of the diffusely reflected light, the light power of the original light beam can be calculated. The design of the integrating sphere (3) makes the measurement of light power more accurate and stable. The integrating sphere (3) has the characteristics of high sensitivity, high stability and high precision, and can accurately measure weak light signals. At the same time, the integrating sphere (3) also has a wide spectral response range and is suitable for measuring light beams of different wavelengths.

[0045] When the cavity (2) is empty, the laser (1) is irradiated, and the optical power measured by the integrating sphere (3) is I0. The length of the cavity (2) is designed to be L. When the liquid to be measured is injected into the cavity (2), the laser will be absorbed and scattered when passing through the liquid to be measured. At this time, the optical power measured by the integrating sphere (3) is I. The liquid loss coefficient α can be calculated using the formula I = I0exp(-αL).

[0046] like Figure 2 As shown, in some embodiments, a stepper motor (12) is provided in the cavity (2) to adjust the thickness of the adjustable cavity (6). The stepper motor (12) is an open-loop control element that converts an electrical pulse signal into an angular displacement or a linear displacement. In the device, the stepper motor is responsible for driving the adjustable cavity (6) to precisely adjust the thickness along the optical path of the light beam emitted by the laser (1). The stepper motor has the advantages of high positioning accuracy, simple control, and no cumulative error. By precisely controlling the number of pulses of the stepper motor, a small adjustment of the thickness of the adjustable cavity can be achieved, thereby meeting the demand for precise measurement of laser loss in liquid. The stepper motor is usually used in conjunction with a driver and a controller. The controller sends a pulse signal to the driver, and the driver drives the stepper motor to rotate a certain angle according to the pulse signal. By continuously sending pulse signals, the stepper motor can gradually adjust the thickness of the adjustable cavity. The adjustable cavity (6) and the stepper motor (12) are connected by a mechanical connector (such as a screw, gear, etc.). When the stepper motor rotates, the mechanical connector converts the rotational motion into linear motion, thereby pushing the adjustable cavity to move along the optical path. According to the test requirements, the thickness adjustment range of the adjustable cavity can be set to a certain interval. By adjusting the pulse number and control strategy of the stepper motor, continuous or step-by-step adjustment of the thickness of the adjustable cavity can be achieved. During the adjustment process, it should be ensured that the sealing between the adjustable cavity and the cavity (2) is not affected. This can be achieved by using sealing elements such as sealing gaskets and O-rings to prevent liquid leakage and foreign impurities from entering the cavity.

[0047] like Figure 3As shown, in some embodiments, a device for flexibly testing laser loss in liquid further includes: an inlet (4) and an outlet (5); the inlet (4) is used to inject liquid into the adjustable cavity (6), and the outlet (5) is used to flow out the liquid in the adjustable cavity (6). The inlet (4) is usually arranged on one side or the top of the cavity (2) to facilitate the injection of liquid into the adjustable cavity (6). The inlet (4) can be designed in the form of a threaded interface, a flange interface or a quick connector to adapt to different types of liquid containers and delivery pipes. The main function of the inlet (4) is to allow the tester to inject the liquid sample to be tested into the adjustable cavity (6). By accurately controlling the injection amount, it can be ensured that the liquid sample in the adjustable cavity meets the test requirements. Position: The outlet (5) is usually arranged on the other side or the bottom of the cavity (2) to facilitate the flow of liquid in the adjustable cavity (6). The structure of the outlet (5) is similar to that of the inlet (4) and can also be designed in the form of a threaded interface, a flange interface or a quick connector. The main function of the outlet (5) is to allow the tester to discharge the liquid sample in the adjustable cavity after the test. By opening the outlet valve or connector, the liquid sample can be quickly and conveniently discharged from the cavity. Valves: Valves can be installed at the inlet (4) and outlet (5) to control the flow of liquid. The valves can be designed to be manual or automatic and opened or closed according to the test requirements. In order to speed up the injection and discharge process of the liquid, a liquid pump can be installed at the inlet (4). Through the action of the pump, the liquid sample can be quickly and evenly injected into the adjustable cavity.

[0048] In some embodiments, the inlet (4) is located above the cavity (2) and the outlet (5) is located below the cavity (2). Due to the effect of gravity, the liquid will naturally flow downward without being interfered by external forces. Therefore, by setting the inlet (4) above the cavity (2) and the outlet (5) below the cavity (2), the effect of gravity can be fully utilized to make it easier for the liquid to be injected into the cavity and flow out from the outlet. When injecting liquid, if the inlet (4) is located above, it is easier to remove bubbles in the cavity. Bubbles have a negative impact on the transmission and measurement accuracy of the laser, so reducing bubbles is crucial to improving the accuracy of the test. The outlet (5) is located below the cavity to facilitate the discharge of remaining liquid and impurities from the cavity after the test. Such a design helps to keep the cavity clean and dry, ready for the next test. The layout of injection from the top and discharge from the bottom allows the tester to control the flow of liquid more intuitively and conveniently during the operation. For example, the injection amount can be judged to be appropriate by observing the flow of the liquid, or the outflow rate of the liquid can be controlled by adjusting the opening of the outlet valve.

[0049] In some embodiments, the inlet (4) is further provided with a valve or controller to control the rate at which the liquid flows in. The design of the inlet (4) should take into account the flow rate and flow velocity of the liquid to ensure that the liquid can flow evenly and stably through the cavity (2) during the test. Furthermore, the inlet (4) should also be equipped with a corresponding valve or controller to quickly and accurately adjust the flow rate and flow velocity of the liquid when necessary.

[0050] Figure 4 This is a schematic diagram of the structure of another cavity in the embodiment of the present utility model. Figure 4 As shown, in some embodiments, a loop (7) and a driving component (8) are provided in the cavity (2) to enable the liquid to flow in the loop (7). The cavity (2), as the core component of the entire testing device, not only provides a closed space for the light beam to pass through the liquid for testing, but also includes a loop (7) and a driving component (8) for enabling the liquid to flow in the cavity. The loop (7) is a liquid flow path provided in the cavity (2), which ensures that the liquid can flow in a certain direction in the cavity (2) so as to interact with the light beam. The design of the loop (7) needs to be customized according to the test requirements and the properties of the liquid. For example, it can be designed into a linear, spiral or other shape to meet different test requirements. In order to ensure the stable flow of the liquid in the loop (7), the size, shape and flow channel structure of the loop (7) need to be reasonably designed to reduce the flow resistance and the generation of bubbles. The driving component (8) is a key component for enabling the liquid to flow in the cavity (2), and it provides the power required for the liquid to flow. Different types of driving components (8) can be selected according to different test requirements and liquid properties. For example, a mechanical drive method such as a hydraulic pump or a pneumatic pump may be used, or an electronically controlled drive method such as an electromagnetic drive or a piezoelectric effect drive may be used.

[0051] In order to accurately control the flow rate and flow velocity of the liquid, the driving component (8) may be equipped with a corresponding controller or regulator. These controllers or regulators can quickly and accurately adjust the flow rate and flow velocity of the liquid according to the test requirements to ensure the accuracy of the test results.

[0052] In some embodiments, the driving component (8) has different powers so that the liquid flows at different speeds. The power adjustability of the driving component (8) is an important feature of the test device. By adjusting the power of the driving component (8), the flow speed of the liquid in the cavity (2) can be precisely controlled. Different flow speeds are crucial for testing the optical loss characteristics of different liquids. For example, in some cases, a slower flow speed may be more suitable for observing the interaction between the liquid and the light beam; while in other cases, a faster flow speed may be more helpful in simulating conditions in actual applications. Driving components (8) with different powers make the test device more adaptable and flexible. It can adapt to different types of liquids, different test conditions and different test requirements. For example, for liquids with high viscosity, a higher power driving component (8) may be required to overcome flow resistance; while for liquids with low viscosity, a lower power driving component (8) can be used to save energy and reduce wear.

[0053] In some embodiments, the cross-section of the loop (7) is circular. In this test device, the cross-section of the loop (7) is designed to be circular. The circular cross-section can provide a uniform flow path, reduce eddies and turbulence during the flow process, and thus ensure that the liquid flows at a stable speed in the loop (7). The loop (7) with a circular cross-section helps ensure that the liquid flows through the light beam at a stable speed and in a uniform state during the test. This can improve the accuracy and reliability of the test and reduce errors caused by unstable flow.

[0054] In some embodiments, a device for flexibly testing laser loss in liquid further includes: a tachometer (9) for measuring the flow rate of the liquid in the circuit (7).

[0055] Specifically, the tachometer (9) is an instrument for measuring the rotational speed of a rotating object. It calculates the rotational speed by sensing or detecting the motion state of the rotating object. The working principle of the tachometer (9) may vary depending on the specific type, but common tachometers (9), such as centrifugal tachometers, magnetic tachometers, electric tachometers (9), etc., generally use centrifugal force, magnetism, or alternating current to detect the rotational speed of the rotating object. In the test device, the tachometer (9) may be directly or indirectly connected to the liquid flow. For example, it can infer the flow rate by measuring the rotational speed of the liquid in the loop (7), or indirectly obtain the flow rate information by measuring the rotational speed of a rotating component related to the liquid flow (such as a turbine).

[0056] In some embodiments, a device for flexibly testing laser loss in liquid is provided, wherein the tachometer (9) is disposed in the middle of the loop (7). Placing the tachometer (9) in the middle of the loop (7) ensures that it measures the average flow rate of the liquid in the entire loop (7), rather than just the flow rate at the inlet (4) or outlet (5). The middle position can represent the overall flow state of the liquid in the loop (7), which helps to provide more comprehensive and accurate flow rate data, thereby more accurately evaluating the optical loss characteristics of the liquid.

[0057] Figure 5 FIG. 1 is a schematic diagram of another flexible device for testing laser loss in liquid according to an embodiment of the present invention. Figure 5 As shown, in some embodiments, the laser (1) includes:

[0058] The tunable laser (10) is used for emitting laser beams with different wavelengths.

[0059] Specifically, a tunable laser (10) is a laser that can emit laser beams of multiple wavelengths, and its output wavelength can be adjusted within a certain range. Tunable lasers (10) are widely used in many fields such as spectroscopy, photochemistry, medicine, biology, integrated optics, pollution monitoring, semiconductor material processing, information processing and communications. The working principle of the tunable laser (10) is based on the adjustment of the optical resonant cavity. By changing the length or refractive index of the resonant cavity, the wavelength of the laser can be changed, thereby achieving the purpose of adjustable wavelength. Most tunable lasers (10) use a working material with a wide fluorescence spectrum, and use certain elements (such as a grating) or changing certain external parameters (such as a magnetic field, temperature, etc.) to move the energy level of the laser transition, thereby achieving wavelength tuning.

[0060] A power supply (11) is used to supply power to the tunable laser (10).

[0061] Specifically, the power supply (11) is a device that supplies power to the tunable laser (10). It provides stable electrical energy to ensure the normal operation of the tunable laser (10). The stability and quality of the power supply (11) have an important impact on the performance and output wavelength of the tunable laser (10). It is necessary to select an output voltage and current that match the tunable laser (10) to ensure that the tunable laser (10) can operate normally and emit the required wavelength. The stability of the power supply (11) has an important impact on the output wavelength and performance of the tunable laser (10). Therefore, it is necessary to select a power supply (11) with high stability.

[0062] By adjusting the wavelength of the tunable laser (10), fixing the liquid in the cavity (2), and repeating the measurement, the loss coefficient of the tunable laser (10) at different wavelengths can be obtained. The loss generated in different bands under the same liquid is different. This set of equipment can be used to select the optimal underwater tunable laser (10) band. The following table shows the loss coefficient results obtained by measuring tap water. It should be noted that due to the regional differences in tap water and the differences in measurement equipment, those skilled in the art may obtain data that deviates from the table below when using the equipment of the present utility model for measurement, but this does not mean that the present utility model cannot be implemented. On the contrary, those skilled in the art have reproduced the test results of different wavelengths using the content disclosed in the present utility model, confirming that the present utility model can be reproduced. The data in the table below are the data obtained by the applicant of the present utility model when measuring using the device of the present technical solution. They are for reference only by those skilled in the art, and do not mean that the test data that is exactly the same as the current measurement can be measured.

[0063] Water optical power Underwater optical power Water body length Loss coefficient α Test wavelength <![CDATA[I0 / mW]]> I / mW L / m m-1 450nm 60 26.7 0.877 0.923239449 532nm 90 31 0.877 1.215304978

[0064] The tunable laser (10) in this embodiment can emit laser beams of various wavelengths, which enables the system to adapt to different application requirements; through precise current, temperature or mechanical control, high-precision wavelength tuning and stable output can be achieved.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in this field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0066] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A device for flexibly testing laser loss in liquid, characterized in that: include: Laser (1), cavity (2) and integrating sphere (3); The cavity (2) is made of a transparent material on the optical path of the light beam emitted by the laser (1); The cavity (2) comprises at least one adjustable cavity (6); the adjustable cavity can adjust the thickness along the optical path of the light beam emitted by the laser (1); The integrating sphere (3) is located on the optical path of the light beam emitted by the laser (1) to receive the light beam emitted by the laser (1) and detect the light power.

2. The device for flexibly testing laser loss in liquid according to claim 1, characterized in that: A stepping motor (12) is provided in the cavity (2) to adjust the thickness of the adjustable cavity (6).

3. The device for flexibly testing laser loss in liquid according to claim 1, characterized in that: It also comprises an inlet (4) and an outlet (5); the inlet (4) is used to inject liquid into the adjustable cavity (6), and the outlet (5) is used to let the liquid in the adjustable cavity (6) flow out.

4. The device for flexibly testing laser loss in liquid according to claim 3, characterized in that: The inlet (4) is located above the cavity (2), and the outlet (5) is located below the cavity (2).

5. The device for flexibly testing laser loss in liquid according to claim 1, characterized in that: A circuit (7) and a driving component (8) are provided in the cavity (2) to enable liquid to flow in the circuit (7).

6. The device for flexibly testing laser loss in liquid according to claim 5, characterized in that: The driving components (8) have different powers to make the liquid flow at different speeds.

7. The device for flexibly testing laser loss in liquid according to claim 5, characterized in that: The cross section of the loop (7) is circular.

8. The device for flexibly testing laser loss in liquid according to claim 5, characterized in that: Also includes: A tachometer (9) is used to measure the flow rate of the liquid in the circuit (7).

9. The device for flexibly testing laser loss in liquid according to claim 8, characterized in that: The tachometer (9) is arranged in the middle of the loop (7).

10. The device for flexibly testing laser loss in liquid according to claim 1, characterized in that: The laser (1) comprises: a tunable laser (10) for emitting laser beams of different wavelengths; A power supply (11) is used to supply power to the tunable laser (10).

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