CN113281227B - An easy-to-operate optical fiber array dynamic liquid absorption tester - Google Patents

Abstract

The invention relates to the technical field of hygroscopic material detection, and discloses an optical fiber array dynamic liquid absorption tester that is easy to operate and use. It includes a shell and a test box contained in the shell and is used to detect the diffusion of liquid on the material sample to be tested. In the characteristic detection device, the test box is provided with a sample bracket for carrying the material sample to be tested and a compression component for fixing the sample bracket to the test box. Through the compression assembly provided on the test box, the sample bracket can be quickly disassembled and assembled in the test box, which is convenient and fast, saving time and effort.

Description

An easy-to-operate optical fiber array dynamic liquid absorption tester

Technical field

The invention relates to the technical field of hygroscopic material detection, and in particular to an optical fiber array dynamic liquid absorption tester that is easy to operate and use.

Background technique

The liquid absorption performance of materials is one of the important application properties of materials, and it is widely used in textile, papermaking, medical and health and other industries. This property is often used in the textile and apparel industry to characterize the moisture absorption and quick-drying properties of sportswear fabrics and underwear; in the papermaking and tobacco industries, this property is often used to evaluate the moisture content of paper or tobacco leaves; in the medical industry, it is used to evaluate the effect of surgical gowns, sheets, etc. on blood. Absorption performance; the sanitary products industry focuses on the absorption and penetration properties of liquids such as diapers and sanitary napkins. In recent years, tissue materials such as artificial blood vessels and nerves made of nanofibers also need to be evaluated for their blood absorption and penetration properties.

At present, the mainstream testing instruments on the market mainly consist of a detection box, a sample holder installed in the detection box to hold the material sample to be tested, and a detection device used to detect the diffusion characteristics of the liquid on the material sample to be tested. The sample holder will be equipped with brackets that conform to the shape and structure of the material sample to be tested, so that the material sample to be tested can be placed on it more stably.

In the prior art, the shape of the bracket on the sample bracket is relatively fixed. When it is necessary to place the material samples to be tested with different shapes and structures, the sample bracket needs to be removed from the test box and replaced with a bracket with the required shape and structure. However, the sample bracket is mostly installed on the test box by screws, which is time-consuming and labor-intensive, and the disassembly and assembly operations are inconvenient.

Contents of the invention

In order to solve the technical problems in the prior art that the sample holder of the detection box of the mainstream testing instrument is inconvenient to disassemble and assemble on the test box, and is time-consuming and labor-intensive, the present invention provides an optical fiber array dynamic liquid absorption test that is easy to operate and use. instrument.

The present invention adopts the following technical solution to realize: an optical fiber array dynamic liquid absorption tester that is easy to operate and use, including a shell and a test box contained in the shell and used to detect the diffusion characteristics of the liquid used on the material sample to be tested. A detection device, the test box is provided with a sample bracket for carrying the material sample to be tested and a compression component for fixing the sample bracket on the test box.

As a further improvement of the above solution, the sample bracket includes a support plate, the top of the support plate is provided with a positioning bracket for placing the material sample to be tested, and the bottom of the support plate is provided with a positioning bracket connected to the positioning bracket. There are two plate slots on opposite sides of the test box for inserting the two ends of the support plate.

As a further improvement of the above solution, the compression assembly includes four connecting rods. The four connecting rods are arranged in groups of two and are respectively inserted on both sides of the wall of the test box; two connecting rods in each group The connecting rods are symmetrical to each other with respect to the support plate;

One end of each connecting rod extends into the test box and is rotatably connected to a swing rod. The middle part of the swing rod is rotationally connected to a limiting rod parallel to the connecting rod, and the limiting rod is The end of the position rod away from the swing rod is fixed on the inner wall of the test box, the end of the swing rod away from the connecting rod is fixed with a pressing block, and the support plate is provided with the The pressing card slot is matched with the pressing card block.

As a further improvement of the above solution, a screw rod perpendicular to the connecting rod is rotatably provided on both sides of the test box. The screw rod is sleeved with a sleeve that matches its thread, and the screw rod is mounted on the screw rod. The threads on both sides of the axial direction have opposite directions; a disk is rotated on the outside of each sleeve; and the opposite sides of the two disks on each screw are provided with racetrack-shaped limits. groove; the limiting groove is located on the side of the disk surface close to the support plate, and one end of the limiting groove is tilted toward the center of the disk connected to it; the other end of each connecting rod is One end is provided with a limiting block that is slidably engaged with the limiting groove.

As a further improvement of the above solution, two fixed rings are arranged around the outer circumference of the test box; the two ends of each screw are vertically fixed on the annular surfaces of the two fixed rings respectively; each Two connecting rods are provided between the fixed ring and the test box;

The middle parts of the two screw rods are fixedly connected with pulleys, and one of the fixed rings is also provided with two pulleys opposite each other. The four pulleys are distributed in a square shape, and the distance between the four pulleys is They are connected through a belt drive, and a crank handle is installed on the axle of one of the pulleys.

As a further improvement of the above solution, it is characterized in that the detection device includes two sets of laser emitting assemblies installed on one side of the test box and symmetrical with respect to the sample holder, and the upper and lower edges of the sample holder are Coaxial reflectors and laser receiving components are arranged in order in directions away from the sample holder; the test box is provided with an optical output port for inputting the laser beam into the test box;

The reflector reflects the laser beam emitted by the laser emitting component on the corresponding surface of the material sample to be tested; the reflection angle of the laser beam on the reflector is ninety degrees; the laser receiving component For converting the laser beam reflected through the surface of the material sample to be measured into an electrical signal;

The detection device also includes a data processing device, which is used to process the electrical signal and analyze the diffusion characteristics of the liquid used on the material sample to be tested.

As a further improvement of the above solution, the laser emission component includes a fiber pulse laser, a fiber splitter and a emission lens in sequence; the fiber pulse laser is used to emit a narrow pulse infrared laser beam; the fiber splitter is used to transmit the emitted The outgoing laser beam is evenly split; the emitting lens is used to shrink the split laser beam.

As a further improvement of the above solution, the laser receiving component includes a receiving lens and a diode array. The receiving lens is used to refract the laser beam reflected from the surface of the material sample to be measured to the diode array; the diode array The array is used to convert the laser beam refracted by the receiving lens into a corresponding electrical signal.

As a further improvement of the above solution, a liquid storage tank and a peristaltic pump are installed in the test box. The input port of the peristaltic pump is connected with the output port of the liquid storage tank. The output port of the peristaltic pump is connected with a conductor. One end of the liquid pipe penetrates from the top of the test box and sequentially penetrates the diode array, receiving lens and reflector located above the test box.

As a further improvement of the above solution, the data processing device includes a data acquisition card connected to the diode array and a data processor connected to the data acquisition card. The data acquisition card receives electrical signals and transmits them via USB. The interface is transmitted to the data processor for corresponding analysis and processing.

The beneficial effects of the present invention are:

The easy-to-operate optical fiber array dynamic liquid absorption tester of the present invention can realize rapid disassembly and assembly of the sample bracket in the detection box through the compression assembly provided on the test box, which is convenient and quick, saving time and effort.

The easy-to-operate optical fiber array dynamic liquid absorption tester of the present invention improves the system optical path of the traditional optical fiber array laser and can measure all liquids except highly volatile and highly corrosive liquids. It uses the optical fiber laser to emit incident laser light and uses optical fiber. The optical fiber splitter with splicing technology evenly splits the laser to achieve uniform light intensity on the surface of the sample to be measured. Through the special design of the transmitting and receiving optical systems, the co-optical axis of the transmitting optical system and the receiving optical system can be realized, in a thin Liquid is dripped on the surface of the sheet material. When the liquid spreads, the reflected light intensity received by the receiving optical system changes and the light intensity is converted into a voltage signal. By observing changes in voltage signals and referring to national standards to study test indicators, the dynamic liquid absorption process of the material is quantitatively analyzed.

The easy-to-operate optical fiber array dynamic liquid absorption tester of the present invention can transform the existing principle of detecting transmitted light intensity into the principle of detecting reflected light intensity. Such optical path systems can be installed on both the front and back sides of the sample to be tested. , you can detect the liquid diffusion characteristics of both front and back sides.

Description of the drawings

Figure 1 is a schematic cross-sectional structural diagram of an optical fiber array dynamic liquid absorption tester provided in Embodiment 1 of the present invention that is easy to operate and use;

Figure 2 is an enlarged structural schematic diagram of position A in Figure 1;

Figure 3 is a schematic cross-sectional structural view of the easy-to-use optical fiber array dynamic liquid absorption tester in Figure 1 in another state;

Figure 4 is an enlarged structural schematic diagram of B in Figure 3;

Figure 5 is a schematic top view of the structure of the housing in Figure 1;

Figure 6 is a schematic structural diagram of the optical fiber end face of the optical fiber splitter in Figure 1.

Description of main symbols:

1. Housing; 2. Test box; 3. Support plate; 4. Positioning bracket; 5. Access port; 6. Fiber pulse laser; 7. Fiber optic splitter; 8. Emitting lens; 9. Reflector; 10 , receiving lens; 11. diode array; 12. catheter; 13. light output port; 14. liquid reservoir; 15. peristaltic pump; 16. data acquisition card; 17. USB interface; 18. pendulum; 19 , pressing block; 20. limit rod; 21. pressing slot; 22. connecting rod one; 23. rod groove; 24. screw; 25. sleeve; 26. disc; 27. bearing; 28. Limit groove; 29, limit block; 30, pulley; 31, fixed ring; 32, connecting rod two; 33, rocking handle; 34, plate slot.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Example 1

Please refer to Figures 1 to 5 for an easy-to-operate optical fiber array dynamic liquid absorption tester, including a housing 1 and a test box 2 contained in the housing 1 and used to detect the diffusion characteristics of the liquid used on the material sample to be tested. As for the detection device, the test box 2 is provided with a sample bracket for carrying the material sample to be tested and a compression assembly for fixing the sample bracket to the test box 2 . The assembly and disassembly of the sample bracket on the test box 2 can be facilitated by pressing the assembly. The housing 1 may be a box with an overall rectangular structure and a door. The test box 2 may have a rectangular structure and have a door to facilitate the opening and closing of the test box 2 .

The sample bracket includes a support plate 3. The top of the support plate 3 is provided with a positioning bracket 4 for placing the material sample to be tested. The bottom of the support plate 3 is provided with a through hole 5 connected to the positioning bracket 4. The through hole 5 can hollow out the bottom of the positioning bracket 4 to expose the material sample to be tested, so as to facilitate detection of the bottom surface of the material sample to be tested. Two board slots 34 are provided on opposite sides of the test box 2 for the two ends of the support plate 3 to be inserted. In this embodiment, the board slots 34 and the support plate 3 are snap-fitted.

The compression assembly includes four connecting rods 22 , which are arranged in pairs and inserted into both sides of the wall of the test box 2 respectively. The two connecting rods 22 in each group are symmetrical to each other about the support plate 3 . In this embodiment, the test box 2 is provided with four rod grooves 23 . The four rod grooves 23 correspond to the positions of the four connecting rods 22 . The four connecting rods 22 are slidably inserted into the four rod grooves 23 . The connecting rod 22 is perpendicular to the axis direction of the test box 2 .

One end of each connecting rod 22 extends into the test box 2 and is rotationally connected to a swing rod 18. The middle part of the swing rod 18 is rotationally connected to a limit rod 20 parallel to the connecting rod 22, and the limit rod 20 is far away from the test box 2. One end of the swing bar 18 is fixed on the inner wall of the test box 2, so that the middle part of the swing bar 18 can rotate around the limiting rod 20, and the movement directions of the two ends of the swing bar 18 are opposite.

The end of the swing rod 18 away from the connecting rod 22 is fixed with a pressing block 19, and the support plate 3 is provided with a pressing slot 21 that matches the pressing block 19. When the connecting rod 22 is pushed toward the inside of the test box 2 on the rod groove 23, the connecting rod 22 can drive one end of the fork bar 18 to rotate, and the pressing block 19 at the other end of the fork bar 18 can be rotated to the corresponding position. Press the card slot 21 to install and fix the support plate 3 in the test box 2 . When the two connecting rods 22 located on the same side are pushed into the test box 2 at the same time, the two pressing blocks 19 located on the same side can simultaneously press and fix the top and bottom surfaces of the support plate 3, which is stable and reliable. .

Both sides of the test box 2 are rotatably provided with screw rods 24 perpendicular to the connecting rod 22. The screw rods 24 are sleeved with sleeves 25 that match the threads thereof, and the screw rods 24 have opposite threads on both sides of the axial direction. The inner circumferential sides of the two sleeves 25 on each screw rod 24 are respectively provided with internal threads (not shown) corresponding to the thread direction of the screw rod 24, so that the two sleeves 25 rotate when the screw rod 24 rotates. And under a certain limit, they separate or approach synchronously.

A disc 26 is rotatably connected to the outer side of each sleeve 25 . The opposite sides of the two disks 26 on each screw 24 are provided with racetrack-shaped limiting grooves 28 . The limiting groove 28 is located on the side of the disk 26 close to the support plate 3 , and one end of the limiting groove 28 is inclined toward the center of the disk 26 connected thereto. The other end of each connecting rod 22 is provided with a limiting block 29 that is slidably engaged with the limiting groove 28 .

The disc 26, the limit groove 28, the limit block 29, the connecting rod 22 and the rod groove 23 can limit the position of the sleeve 25 when driven by the screw 24, preventing the sleeve 25 from rotating following the screw 24, causing the sleeve to rotate. 25 keeps moving in the axial direction of the screw 24. When the sleeve 25 drives the disc 26 to move synchronously in the axial direction of the screw 24, the disc 26 can drive the connecting rod 22 to move in the rod groove 23 through the limiting groove 28 and the limiting block 29.

Two fixing rings 31 are provided around the outer peripheral side of the test box 2 . The two ends of each screw rod 24 are vertically fixed on the annular surfaces of the two fixed rings 31 respectively. A second connecting rod 32 is provided between each fixed ring 31 and the test box 2, and the fixed ring 31 is fixed on the test box 2 through the second connecting rod 32.

The middle parts of the two screws 24 are fixedly connected with pulleys 30, and two pulleys 30 are arranged opposite each other on one of the fixed rings 31. The four pulleys 30 are distributed in a square shape, and the distance between the four pulleys 30 is They are connected through a belt drive, and a crank handle 33 is installed on the axle of one of the pulleys 30 . One of the pulleys 30 can be driven to rotate by the crank 33, and the other three pulleys can be driven to rotate synchronously through the pulley 30 and the belt, thus driving the two screws 24 to rotate synchronously, so as to finally realize the test chamber 2. Pressure fixation of sample holder.

The detection device is used to detect the diffusion characteristics of the liquid used on the material sample to be tested. The diffusion characteristics on the material sample to be tested in this embodiment are as follows:

Liquid arrival time: the moment when the slope of the moisture content versus time curve is greater than or equal to tan15° for the first time.

Liquid absorption rate: the rate of increase in water content of a material per unit time. The moisture content change curve is the average slope of the moisture content during the test period.

Maximum wetting distance: the farthest distance from the edge of the wetted area of the material surface to the point of liquid dripping.

Liquid spreading speed: The distance traveled by liquid in all directions divided by the time it takes for the liquid to arrive.

One-way transfer index: The ability of liquid to transfer from the upper surface of the material to the lower surface, expressed as the ratio of the difference in liquid absorption on both sides of the material to the test time.

Liquid dynamic transfer comprehensive index: a characterization of the comprehensive performance of liquid dynamic transfer in materials. It is expressed as a weighted value of the material's lower surface liquid absorption rate, one-way transfer index and liquid diffusion rate.

The detection device includes two sets of laser emitting assemblies installed on one side of the test box 2 and symmetrical with respect to the sample carrier. Coaxial reflectors 9 and 9 are arranged above and below the sample carrier in their respective directions away from the sample carrier. Laser receiving component. The test box 2 is provided with an optical output port 13 for inputting the laser beam into the test box 2 .

The reflector 9 reflects the laser beam emitted by the laser emitting component on the corresponding surface of the material sample to be tested. The reflection angle of the laser beam on the reflector 9 is ninety degrees. The laser receiving component is used to convert the laser beam reflected from the surface of the material sample to be measured into an electrical signal.

The detection device also includes a data processing device, which is used to process electrical signals and analyze the diffusion characteristics of the liquid used on the material sample to be tested.

In summary, the detection method of the detection device includes the following steps:

Step S1: Place the material sample to be tested on the sample holder, and determine whether the thickness of the material sample to be tested is greater than a predetermined value;

Step S2: If the thickness of the material sample to be tested is less than or equal to the predetermined value, drip the test liquid onto the surface of the material to be tested; first, make the laser emitting component located above the material sample to be tested in the test box emit a laser beam into the test box. , and then the laser emitting component located under the material sample to be tested in the test box emits a laser beam into the test box;

Step S3: After the laser beam is reflected by the reflector to the surface of the material sample to be measured, it is reflected on the surface of the material sample and received by the laser receiving component;

Step S4: The data processing device converts the laser beam received by the laser receiving component into an electrical signal, and processes and analyzes the diffusion characteristics of the liquid used on the material sample to be tested.

In step S2, if the thickness of the material sample to be tested is greater than the predetermined value, the test liquid is dripped onto the surface of the material to be tested, so that the laser emitting components located above and below the material sample to be tested in the test box are simultaneously emitted into the test box. Laser beam.

The laser emitting component includes a fiber pulse laser 6, an optical fiber splitter 7 and a transmitting lens 8 in sequence. The fiber pulse laser 6 is used to emit narrow pulse infrared laser beams. The optical fiber splitter 7 is used to split the emitted laser beam uniformly. The emission lens 8 is used to shrink the split laser beam.

The laser receiving component includes a receiving lens 10 and a diode array 11. The diodes of the diode array 11 need to be coaxial with the light reflected from the sample surface, so the laser fiber arrangement and the object image relationship need to be considered.

The receiving lens 10 is used to refract the laser beam reflected from the surface of the material sample to be measured to the diode array 11 . The diode array 11 is used to convert the laser beam refracted by the receiving lens 10 into a corresponding electrical signal.

In this embodiment, the fiber pulse laser 6, fiber splitter 7, and transmitting lens 8 are all installed in the housing 1 through corresponding brackets, while the reflector 9, receiving lens 10, and diode array 11 are all installed through corresponding brackets. In test box 2.

Furthermore, the specific working mode of the optical path of the optical fiber array dynamic liquid absorption tester in this embodiment is as follows: when it is necessary to measure the diffusion characteristics of the liquid on the material sample to be tested, the material sample to be tested is first placed on the sample holder, Close the test box 2 and the door on the shell, and transport the liquid in the liquid reservoir to the top of the test box 2 through a peristaltic pump, so that the liquid drops on the material sample to be tested, and the liquid then expands on the surface of the test sample . The narrow pulse infrared laser beam is emitted by the fiber pulse laser 6. The laser beam passes through the fiber splitter 7, and one laser beam is evenly divided into multiple laser beams according to the energy. Each laser beam is emitted from the fiber array of the fiber splitter 7. The fiber splitter 7 The end face of the optical fiber array of the router 7 becomes a lattice pulse laser light source, and then the divergent laser beam can be changed into a contracted laser beam through the emitting lens 8, which is then reflected by the reflector 9 and rotated 90 degrees before being irradiated on the material to be tested. Due to the expansion of the liquid on the sample surface, the part of the light reflected from the sample surface changes. After being refracted by the receiving lens, the reflected light is received by the diode array on the top of the box in the test area and converted into an electrical signal. In the lower part of the test area, there is also the same test laser, which can measure both the upper and lower sides simultaneously when the liquid expands. The data acquisition card at the bottom of the test area transmits the collected electrical signals to the computer in real time through the USB interface to obtain the diffusion characteristics of the liquid on the material sample.

Since coupling between single-mode optical fiber and optical devices is relatively difficult, this embodiment uses multi-mode optical fiber with an outer diameter of 125um. The wavelength should be selected according to the liquid to be measured. The wavelength for measuring water is 980nm, and the wavelength for measuring oil is 1100nm. Other liquids require experiments to determine.

Please refer to Figure 6. The arrangement of optical fibers can be a square structure with a core spacing of 125 μm to form an optical fiber array, which serves as the exit end face of the system. The other end of each optical fiber is split with the optical fiber using a standard FT/APC connector. Device 7 is connected. When designing the entire equipment, the fiber core spacing can be adjusted according to the fiber fineness. The compatibility between the arrangement of the optical fibers and the arrangement of the diode array 11 can be determined by the relationship between the two sets of objects in the system, namely: the luminous point on the optical fiber array and the one to be measured. The illuminated points on the surface of the material sample are one set of object-image relationships; the illuminated points on the surface of the material sample to be tested and the pixel points on the diode array 11 are another set of object-image relationships.

The fiber laser is used to emit the incident laser, and the fiber splitter 7 using fiber splicing technology splits the laser evenly to achieve uniform light intensity on the surface of the sample to be measured. Through the special design of the transmitting and receiving optical systems, the transmitting optical system and Co-optical axis of the receiving optical system. This method produces a more uniform light intensity distribution than the widely used microlens array technology.

After completing the optical path design, in order to verify whether our purpose is achieved, we need to use ANSYS SPEOS to perform optical simulation to simulate the light intensity on the surface to be measured and the optical axis of the emitted and reflected light. By repeatedly adjusting the simulation and experimental optical path design, we finally achieve The two results are close to each other.

Since the electrical signal received by the diode array may be very weak (this is related to the measurement of liquid, material surface conditions, and transmission power), it needs to be amplified. For this reason, a cross-group amplifier and a broadband amplifier need to be installed. Another purpose of designing the system optical path is to transform the existing principle of detecting transmitted light intensity into the principle of detecting reflected light intensity. Such an optical path system can be set up on both the front and back sides of the sample to be tested, so that the liquid diffusion characteristics of the front and back sides can be detected. It should be noted that when testing thin samples, the lasers above and below the sample may interfere with each other, affecting the test results. This issue may require separate testing of the upper and lower parts of the sample. Therefore, a lot of experiments are needed to meet the requirements of sample type and thickness.

A liquid storage tank 14 and a peristaltic pump 15 are installed in the test box 2. The model parameter selection of the peristaltic pump can be based on the diameter of the conduit (which may be related to the viscosity of the liquid). The input port of the peristaltic pump 15 is connected with the output port of the liquid storage tank 14. The output port of the peristaltic pump 15 is connected with a catheter 12. One end of the catheter 12 penetrates from the top of the test box 2 and penetrates through the test box in sequence. The diode array 11, the receiving lens 10 and the reflector 9 are located in the upper part of 2. The upper diode array 11, receiving lens 10 and reflector 9 in the test box 2 are all pre-opened with slots (not shown) for the catheter tube 12 to penetrate, so that the liquid can be accurately dripped from the catheter tube 12 Drop onto the material sample to be tested.

The data processing device includes a data acquisition card 16 connected to the diode array 11 and a data processor connected to the data acquisition card 16. The data acquisition card 16 receives electrical signals and transmits them to the data processor through the USB interface for corresponding analysis and processing. The data processor in this embodiment can be a computer. The data acquisition card 16 is connected to the computer through the USB interface 17 to transmit the electrical signals collected by the data acquisition card to the computer for corresponding analysis and processing.

Example 2

This Example 2 is to verify whether the fiber array dynamic liquid absorption tester of this example meets the experimental equipment requirements. The specific experimental equipment test plan is as follows:

First, water is used as the test liquid and paper is used as the test material sample for repeated testing. Determine the paper thickness and measurement method at the same time. When the paper thickness is greater than a certain value, the upper and lower surfaces can be measured simultaneously. Otherwise, the upper and lower surfaces need to be tested separately. That is, first turn off the incident laser in the lower half of the test area and only measure the liquid on the paper. Extension. Then take the same paper and only measure the diffusion below, and then calculate the above test indicators based on this.

Secondly, change the type of liquid and the type of material to be tested, and conduct repeated tests.

Finally, a comparative test was conducted with the national standard GB/T 21655.2-2009. Since only water can be tested in the national standard, the comparative experiment must also use water as the test liquid. If the test results are close to the national standard, the experimental equipment can be considered to have met the requirements.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (4)

1. The optical fiber array dynamic liquid suction tester is characterized by comprising a shell, a test box and a detection device, wherein the test box is accommodated in the shell, the detection device is used for detecting the diffusion characteristic of liquid on a material sample to be tested, and a sample bracket for bearing the material sample to be tested and a pressing and fixing assembly for fixing the sample bracket on the test box are arranged on the test box;

the sample bracket comprises a supporting plate, a positioning bracket for placing the material sample to be tested is arranged at the top of the supporting plate, and a through hole communicated with the positioning bracket is arranged at the bottom of the supporting plate; two opposite sides in the test box are provided with two board slots for inserting two ends of the supporting board;

the pressing and fixing assembly comprises four connecting rods one by one, wherein the four connecting rods are grouped one by one and respectively inserted into two sides of the wall of the test box; two connecting rods in each group are symmetrical to each other about the supporting plate;

one end of each first connecting rod extends into the test box, one end of each first connecting rod, which is far away from the test box, is connected with a swing rod, the middle part of the swing rod is rotationally connected with a limiting rod parallel to the first connecting rod, one end of the limiting rod, which is far away from the first connecting rod, is fixed on the inner side wall of the test box, one end of the swing rod, which is far away from the first connecting rod, is fixedly connected with a pressing clamping block, and the support plate is provided with a pressing clamping groove matched with the pressing clamping block;

the two sides of the test box are respectively provided with a screw rod perpendicular to the first connecting rod in a rotating way, the screw rods are sleeved with sleeves matched with the screw rods in a threaded way, and the screw threads of the screw rods on the two axial sides are opposite in rotation direction; a disc is rotatably sleeved on the outer side of each sleeve; opposite sides of the two discs on each screw are provided with runway-shaped limit grooves; the limiting groove is positioned on one side of the disc surface, close to the supporting plate, of the disc, and one end of the limiting groove is inclined towards the center of the disc connected with the limiting groove; the other end of each first connecting rod is provided with a limiting block which is in sliding clamping connection with the limiting groove;

two fixing rings are arranged around the outer peripheral side of the test box; two ends of each screw rod are respectively and vertically fixedly connected to the annular surfaces of the two fixing rings; a second connecting rod is arranged between each fixing ring and the test box;

the middle parts of the two screw rods are fixedly sleeved with belt wheels, two belt wheels are also oppositely arranged on one of the fixed rings, the four belt wheels are distributed in a square shape, the four belt wheels are connected through a belt transmission, and a rocking handle is arranged on the wheel shaft of one belt wheel;

the detection device comprises two groups of laser emission components which are arranged on one side of the test box and are symmetrical relative to the sample bracket, and a coaxial reflector and a laser receiving component are sequentially arranged above and below the sample bracket along the direction respectively far away from the sample bracket; the test box is provided with a light transmission port for inputting laser beams into the test box;

the reflector reflects the laser beam emitted by the laser emission component on the corresponding surface of the material sample to be detected; the reflection angle of the laser beam on the reflector is ninety degrees; the laser receiving component is used for converting laser beams reflected by the surface of the material sample to be detected into electric signals;

the detection device also comprises a data processing device, wherein the data processing device is used for processing the electric signals and analyzing the diffusion characteristics of the liquid to be used on the material sample to be detected;

the laser emission component sequentially comprises an optical fiber pulse laser, an optical fiber branching device and an emission lens; the optical fiber pulse laser is used for emitting narrow pulse infrared laser beams; the optical fiber branching device is used for uniformly branching the emitted laser beams; the emission lens is used for shrinking the split laser beams.

2. The optical fiber array dynamic liquid suction tester convenient to operate and use according to claim 1, wherein the laser receiving assembly comprises a receiving lens and a diode array, and the receiving lens is used for refracting laser beams reflected by the surface of a sample of a material to be tested to the diode array; the diode area array is used for converting the laser beam refracted by the receiving lens into a corresponding electric signal.

3. The optical fiber array dynamic liquid suction tester convenient to operate and use according to claim 2, wherein a liquid storage tank and a peristaltic pump are arranged in the test box, an input port of the peristaltic pump is communicated with an output port of the liquid storage tank, a liquid guide pipe is connected to an output port of the peristaltic pump, and one end of the liquid guide pipe penetrates from the top of the test box and sequentially penetrates through a diode area array, a receiving lens and a reflecting mirror which are positioned above the inside of the test box.

4. The optical fiber array dynamic liquid suction tester convenient to operate and use according to claim 2, wherein the data processing device comprises a data acquisition card connected to the diode array and a data processor connected to the data acquisition card, and the data acquisition card receives the electric signals and transmits the electric signals to the data processor through a USB interface for corresponding analysis and processing.