Vapor chamber test system based on modulated laser heating

Abstract

The invention provides a vapor chamber test system based on modulated laser heating. The vapor chamber test system is used for solving the technical problem that a verification result of a thermal element in an existing method has deviation. The test system comprises a rack, a test unit and a data acquisition unit, the test unit comprises a laser, a box body, a laser lens, a laser beam barrel, a positioning barrel and a test box, the laser is mounted on the rack, the box body is mounted at the top of the rack, and the laser lens is mounted at the top of the box body through a supporting and adjusting assembly and is connected with the laser; the laser beam barrel, the positioning barrel and the test box are all positioned in the box body and are sequentially connected from top to bottom; the laser beam barrel is mounted at the top of the box body, and the upper end of the laser beam barrel extends out of the box body; the lower end of the laser lens extends into the laser beam barrel and is adaptively connected with the laser beam barrel; the test box is mounted at the bottom of the box body, and a to-be-tested vapor chamber is placed in the test box; at least one temperature sensor is arranged in the test box, and the data acquisition unit is connected with each temperature sensor.

Description

Technical Field

[0001] The invention relates to a thermal testing technology, and in particular to a temperature homogenizing plate testing system based on modulated laser heating. Background Art

[0002] In complex information processing devices with high-power electronic components, the thermal effect of electronic components is very significant. Due to the close thermal interference between power-consuming components, the heat of power-consuming components needs to be efficiently channeled to ensure the reliability and service life of electronic equipment. Generally, heat pipes, temperature spreaders and other thermal elements based on the principle of phase change heat transfer are used to expand the heat accumulated in the heating center with high heat flux density, reduce the temperature of the hot spot, and thus improve the heat exchange efficiency between power-consuming components and heat sinks. With the continuous reduction in the size and continuous increase in power consumption of high-power electronic devices in the fields of mobile electronic equipment, radar, aerospace, communications, etc., their surfaces are prone to complex temperature changes with ultra-high heat flux density and high transients, while high integration density and more complex front-end circuits lead to a sharp increase in the heat dissipation of electronic devices, making the thermal management strategy of electronic devices more complicated. Therefore, it is very important to accurately and reliably verify and evaluate the heat transfer performance of thermal elements.

[0003] For a long time, the verification of the heat transfer performance of thermal elements is usually based on the economic perspective. First, resistive heating elements are used to simulate the hot end of power-consuming components. The Joule effect of the resistor element inside the heating element is used to convert the electrical energy of the steady-state power consumption of components with equivalent power consumption into thermal energy. The heat is then transferred to the intermediate thermal element in contact with it through the shell, which diffuses and conducts it to the heat sink. After that, the final stable operating temperature of the heating element is collected to characterize the heat transfer thermal resistance of the thermal element, thereby verifying whether the thermal element meets the use objectives of the thermal design.

[0004] For example, the Chinese invention patent with publication number CN102621177A discloses a heat pipe test machine and a heat pipe test system using the heat pipe test machine. The core of the method is to use a heating rod (resistance heating element) combined with a heating copper block to perform heat pipe testing, and use the directly input electric power as the heat transfer power consumption of the heating copper block to verify the steady-state heat transfer performance of the tested heat pipe workpiece. However, this method is only suitable for power consumption analysis of stable heating. Due to the heat capacity effect between the resistance heating element and the heating copper block, when the current is converted into heat and then absorbed by the heating element material, diffused and then transferred to the thermal element, the transient heat capacity effect will be seriously distorted, resulting in deviations in the verification results of the thermal element. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that the verification results of thermal elements in the existing methods are biased, and to provide a temperature homogenizing plate testing system based on modulated laser heating.

[0006] To achieve the above objectives, the technical solutions provided by the present invention are:

[0007] A temperature chamber test system based on modulated laser heating, which is special in that:

[0008] It includes a rack, a test unit and a data acquisition unit;

[0009] The test unit includes a laser, a box, a laser lens, a laser beam tube, a positioning tube and a test box;

[0010] The laser is mounted on the rack and is used to emit modulated laser with specific energy; the box is mounted on the top of the rack, and the laser lens is mounted on the top of the box through a support adjustment component, and the upper end is connected to the laser;

[0011] The laser beam tube, positioning tube and test box are all located in the box and connected in sequence from top to bottom; the laser beam tube is installed on the top of the box and the upper end extends out of the box, and the lower end of the laser lens extends from the upper end of the laser beam tube into the laser beam tube and is connected with the laser beam tube; the test box is installed at the bottom of the box, and the interior of the test box is used to place the temperature equalizing plate to be tested; at least one temperature sensor is provided in the test box, which is used to be installed at different positions on the temperature equalizing plate to be tested;

[0012] The data acquisition unit is connected to each temperature sensor respectively, and is used to obtain the temperature information of the temperature equalizing plate to be tested.

[0013] Furthermore, it also includes an inclination adjustment reducer;

[0014] A suspension is installed on the top of the frame, and the inclination adjustment reducer and the box body are both installed on the suspension; the inclination adjustment reducer and the box body are connected to adjust the installation angle of the box body.

[0015] Furthermore, the support adjustment assembly is located on the top outer side of the box body, and includes a lens fixing bracket, a vertical plate bracket, two side plate brackets, a slide plate and two slide rails;

[0016] The two slide rails are parallel to each other and horizontally installed on the top of the box body, and the slide plate is located between the two slide rails and is slidably connected thereto; a first mounting hole is provided at the center of the slide plate, and the upper end of the laser beam light tube extends out of the box body and the first mounting hole and is installed on the slide plate;

[0017] The two side plate brackets have the same structure, are parallel to each other and are vertically installed on the skateboard; the vertical plate bracket is vertically installed between the two side plate brackets and is vertically connected to the two side plate brackets respectively;

[0018] The lens fixing bracket is installed at the upper end of one side of the vertical plate bracket and is parallel to the slide plate; a second mounting hole opposite to the first mounting hole is provided in the center of the lens fixing bracket for mounting the laser lens.

[0019] Furthermore, the vertical plate bracket is provided with a transverse waist-shaped hole connected to the lens fixing bracket, which is used to adjust the transverse installation position of the lens fixing bracket to achieve the adjustment of the transverse installation position of the laser lens;

[0020] Arc-shaped mounting holes are respectively provided at corresponding positions where the upper and lower sides of the side plate bracket are connected to the vertical plate bracket, which are used to adjust the mounting angle of the vertical plate bracket to achieve adjustment of the mounting angle of the laser lens.

[0021] Furthermore, the box body includes an upper box body and a lower box body; the upper box body and the lower box body are connected to each other, and one end close to each other is open;

[0022] The two slide rails are respectively installed on the outer side of the top cover of the upper box body, and an elliptical adjustment hole opposite to the first installation hole is provided at the center of the top cover of the upper box body, and the length direction of the adjustment hole is consistent with the sliding direction of the slide plate;

[0023] The test box is installed on the bottom plate of the lower box body; a fan is installed on one side wall of the lower box body, and a detachable operation window is installed on the other side wall opposite to the fan, and a ventilating port opposite to the fan is provided on the operation window.

[0024] Furthermore, a laser protection plate is installed on the inner side of the top of the upper box body, and a through hole corresponding to the adjustment hole is provided at the center of the laser protection plate.

[0025] Further, the test box comprises an upper cover plate, a heat sink and a lower cover plate; the upper cover plate and the lower cover plate are connected, and the heat sink is located between the two;

[0026] A first groove is provided at the center of the lower surface of the upper cover plate for placing the temperature equalizer to be tested; a positioning hole is provided at the center of the upper surface of the upper cover plate and is connected to the bottom of the first groove, and the positioning hole is used for positioning and installing the positioning cylinder; during the test, the modulated laser emitted by the laser passes through the laser lens, the laser beam tube, the positioning tube, and the positioning hole in sequence to reach the upper surface of the temperature equalizer to be tested;

[0027] The temperature sensor is located in the first groove and is installed on the upper surface of the temperature equalizing plate to be measured; a plurality of wiring grooves connected to the first groove are provided on the circumference of the lower surface of the upper cover plate for leading out the temperature sensor connection wires;

[0028] The lower cover plate is mounted on the bottom plate of the lower box body, and a second groove is provided on the upper surface of the lower cover plate for mounting the heat sink.

[0029] Furthermore, it also includes a flow meter installed on the rack; the heat sink is a water-cooled heat sink, and the flow meter is connected to the water-cooled heat sink through a pipeline.

[0030] Furthermore, the upper surface of the heat sink is provided with a thermally conductive silicone pad or coated with thermally conductive silicone grease.

[0031] Furthermore, the laser beam tube and the positioning tube are hollow structures in their circumference; the laser is connected to the upper end of the laser lens through an optical fiber.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention provides a temperature homogenizing plate test system based on modulated laser heating, including a frame, a test unit and a data acquisition unit, wherein the test unit includes a laser, a box, a laser lens, a laser beam tube, a positioning tube and a test box. The present invention uses laser as a heating source. The laser has the characteristics of high control sensitivity and good transient responsiveness. A modulated transient laser form is used to directly irradiate the surface of the test specimen. The laser does not have a heater thermal capacity, and the heating rising and falling edges are extremely short, which can save test time and improve test efficiency, and also make the test results more accurate.

[0034] 2. The present invention adopts a modulated transient laser form, which avoids the significant heat capacity effect of the metal resistance heater, can restore the transient changes of high heat flux in the application scenario on the surface of the specimen, and has good testing performance for the heat transfer performance of the temperature equalizing plate under transient heat source conditions.

[0035] 3. The present invention adjusts the installation angle of the box through the inclination adjustment reducer, so that it is suitable for different application scenarios.

[0036] 4. The present invention installs the laser lens on the box body through the support adjustment component, and can adjust the specific position and angle of the laser lens installation, so as to ensure that the emitted laser enters the center position of the test box through the positioning tube, further improving the test accuracy and effectiveness.

[0037] 5. The present invention has a fan installed in the lower box body to eliminate the smoke generated during the laser heating process.

[0038] 6. The present invention installs a laser protection plate on the inner side of the top of the upper box body, which can not only protect the laser generated by diffuse reflection during the test, but also diffuse the heat generated by the laser lens, avoiding heat accumulation at the laser installation position on the top of the upper box body and causing installation damage.

[0039] 7. The heat sink of the present invention adopts a water-cooled heat sink, and the water-cooled heat sink is connected to a flow meter through a pipeline. The circulating water flow of the water-cooled heat sink is measured and adjusted by the flow meter to ensure that the test process proceeds smoothly.

[0040] 8. The laser beam tube and positioning tube of the present invention are hollow structures in the circumference, which are used to provide a channel for exhausting smoke and removing dust on the laser emission path.

[0041] 9. The present invention has a simple structure, is easy to manufacture, convenient to maintain, has a low economic cost and reliable performance.

[0042] 10. The test of the present invention has good economical efficiency, does not damage the test object, has strong portability, and can be widely used in laser-type thermal tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of an embodiment of a temperature homogenizing plate testing system based on modulated laser heating of the present invention.

[0044] Figure 2 It is a schematic diagram of the internal structure of a test unit in an embodiment of a temperature homogenizing plate test system based on modulated laser heating of the present invention.

[0045] Figure 3 It is a schematic diagram of the structural decomposition of a test unit in an embodiment of a temperature homogenizing plate test system based on modulated laser heating of the present invention.

[0046] Figure 4 It is a schematic diagram of the structural decomposition of a test box in an embodiment of a temperature homogenizing plate test system based on modulated laser heating of the present invention.

[0047] Figure 5 It is a structural schematic diagram of an upper cover plate of a test box in an embodiment of a temperature homogenizing plate test system based on modulated laser heating of the present invention.

[0048] The following are the descriptions of the reference numerals:

[0049] 1-frame, 2-data acquisition unit, 3-laser, 4-box, 41-upper box, 411-adjustment hole, 412-laser protection plate, 413-through hole, 42-lower box, 421-fan, 422-operation window, 423-vent, 5-laser lens, 6-laser beam tube, 7-positioning tube, 8-test box, 81-upper cover, 811-first groove, 812-positioning hole, 813-wiring groove, 82-heat sink, 83-lower cover, 831-second groove, 9-temperature averaging plate to be tested, 10-tilt adjustment reducer, 11-suspension, 12-lens fixing bracket, 121-second mounting hole, 13-vertical plate bracket, 14-side plate bracket, 15-slide plate, 151-first mounting hole, 16-slide rail, 17-flow meter. DETAILED DESCRIPTION

[0050] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0051] like Figure 1 As shown, this embodiment provides a temperature homogenizing plate testing system based on modulated laser heating, including a frame 1, a testing unit, a data acquisition unit 2 and an inclination adjustment reducer 10.

[0052] Combination Figure 1 , Figure 2 , Figure 3 As shown, the test unit includes a laser 3, a box 4, a laser lens 5, a laser beam tube 6, a positioning tube 7 and a test box 8.

[0053] The frame 1 is a frame structure as a whole, with a suspension 11 installed on the top. The inclination adjustment reducer 10 and the box 4 are both installed on the suspension 11. The rotating shaft of the inclination adjustment reducer 10 is connected to the box 4. According to the actual test scenario, the gravity test inclination angle of the box 4 is adjusted by controlling the inclination adjustment reducer 10.

[0054] The laser 3 is installed inside the frame 1, and is used to emit modulated laser of specific energy. The laser lens 5 is installed on the top of the box 4 through the support adjustment assembly, and the upper end is connected to the laser 3 through the optical fiber. The laser beam tube 6, the positioning tube 7, and the test box 8 are all located in the box 4 and are connected in sequence from top to bottom. The laser beam tube 6 is installed on the top of the box 4 and the upper end extends out of the box 4. The lower end of the laser lens 5 extends from the upper end of the laser beam tube 6 into the laser beam tube 6 and is adapted to be connected with the laser beam tube 6.

[0055] The support and adjustment assembly is located on the top outer side of the box body 4 , and includes a lens fixing bracket 12 , a vertical plate bracket 13 , two side plate brackets 14 , a slide plate 15 and two slide rails 16 .

[0056] The two slide rails 16 are parallel to each other and horizontally installed on the top of the box body 4, and the slide plate 15 is located between the two slide rails 16 and slidably connected thereto. Specifically, the distance between the two slide rails 16 is adapted to the width of the slide plate 15, and the sides close to each other are respectively provided with slide grooves matching the thickness of the slide plate 15, and the two sides of the width of the slide plate 15 are respectively extended into the corresponding slide grooves to achieve the sliding connection between the slide plate 15 and the slide rails 16, thereby adjusting the position of the slide plate 15 in the horizontal direction of the box body 4, and then adjusting the installation position of the laser lens 5.

[0057] In this embodiment, a first mounting hole 151 is provided at the center of the slide plate 15. The upper end of the laser beam tube 6 extends out of the box body 4 and the first mounting hole 151, and is mounted on the slide plate 15 and fastened by bolts. The other end of the laser lens 5 extends from the upper end of the laser beam tube 6 into the laser beam tube 6 and is adapted to be connected with the laser beam tube 6. The slide plate 15 is made of a material with a surface reflection effect and good thermal conductivity, such as a coated metal material, a polished aluminum plate, etc.

[0058] The laser beam light tube 6 is a hollow cylinder with hollows in its circumference, which is used to provide a channel for exhausting smoke and dust removal on the outgoing laser path. At the same time, one end of the laser beam light tube 6 has a mounting step, and the step is provided with an axial threaded hole that can be threadedly connected to the slide plate 15. The other end of the laser beam light tube is provided with a threaded through hole, which is used to lock and fix the positioning tube 7. The positioning tube 7 is also a hollow cylinder with hollows in its circumference, which is used to provide a channel for exhausting smoke and dust removal on the outgoing laser path. The outer diameter of the positioning tube 7 is slightly smaller than the inner diameter of the laser beam light tube 6, and it can be just installed in the laser beam light tube 6. After adjusting the position of the positioning tube 7 up and down, it is bolted through the threaded holes on the circumference of the laser beam light tube 6.

[0059] The two side plate brackets 14 have the same structure, are parallel to each other and are vertically mounted on the slide plate 15; the vertical plate bracket 13 is vertically mounted between the two side plate brackets 14, and the vertical plate bracket 13 is provided with a mounting threaded hole, which is vertically connected to the side plate bracket 14 by bolts. The lens fixing bracket 12 is installed at the upper end of one side of the vertical plate bracket 13 and is parallel to the slide plate 15. The lens fixing bracket 12 is provided with a mounting threaded hole, which is connected to the vertical plate bracket 13 by bolts. A second mounting hole 121 opposite to the first mounting hole 151 is provided in the center of the lens fixing bracket 12 for mounting and fixing the laser lens 5.

[0060] Preferably, in order to make the emitted laser spot accurately concentric with the positioning tube 7, the emitted laser must enter the center position of the test box 8 through the positioning tube 7. In this embodiment, a transverse waist-shaped hole connected to the lens fixing bracket 12 is provided on the vertical plate bracket 13, which is used to adjust the horizontal installation position of the lens fixing bracket 12, thereby realizing the adjustment of the horizontal installation position of the laser lens 5. At the same time, an arc hole connected to the vertical plate bracket 13 is provided on the side plate bracket 14 (that is, arc holes are respectively provided at the corresponding positions of the upper and lower side plate brackets 14 connected to the vertical plate bracket 13, and a mounting hole for mounting the vertical plate bracket 13 is provided in the middle), which is used to adjust the installation angle of the vertical plate bracket 13, thereby realizing the adjustment of the installation angle of the laser lens 5.

[0061] The box body 4 includes an upper box body 41 and a lower box body 42; the upper box body 41 and the lower box body 42 are connected to each other, and one end close to each other is open.

[0062] In order to observe and monitor the test status, the upper box 41 and the lower box 42 can be made of organic light-transmitting materials such as polymethyl methacrylate PMMA, polystyrene PS, polycarbonate PC, or inorganic light-transmitting materials such as silicate glass. During the test, the upper box 41 and the lower box 42 are fixed by bolts or locks.

[0063] The two slide rails 16 are respectively installed on the outer side of the top cover of the upper box body 41 . An elliptical adjustment hole 411 opposite to the first installation hole 151 is provided at the center of the top cover of the upper box body 41 , and the length direction of the adjustment hole 411 is consistent with the length direction of the slide plate 15 .

[0064] A laser protection plate 412 is installed on the inner side of the top of the upper box 41, and a through hole 413 corresponding to the adjustment hole 411 is provided at the center of the laser protection plate 412. The laser protection plate 412 is used to protect the laser generated by diffuse reflection during the test and to diffuse the heat generated by the laser lens 5 to avoid heat accumulation at the laser installation position on the top of the upper box 41, causing installation damage. The laser protection plate 412 is made of a material with a surface reflection effect and good thermal conductivity, such as a coated metal material, a polished aluminum plate, etc.

[0065] The test box 8 is installed on the bottom plate of the lower box 42, and the test uniform temperature plate 9 is placed inside the test box. During the test, smoke and dust that cannot be completely eliminated will be generated during laser heating, so a fan 421 is installed on one side wall of the lower box 42, and a vent 423 opposite to the fan 421 is installed on the other side wall opposite to the fan 421. During the test or after the test, smoke removal and exhaust can be performed as needed.

[0066] Combination Figure 4 and Figure 5 As shown, the test box 8 includes an upper cover plate 81, a heat sink 82 and a lower cover plate 83; the upper cover plate 81 and the lower cover plate 83 are connected, and the heat sink 82 is located between the two. At the same time, the upper cover plate 81 and the lower cover plate 83 are made of heat-insulating materials, such as polytetrafluoroethylene, nylon, etc., to effectively control heat loss and reduce test uncertainty and deviation caused by process thermal resistance in the test.

[0067] A first groove 811 is provided at the center of the lower surface of the upper cover plate 81 for placing the temperature-averaging plate 9 to be tested. A positioning hole 812 (generally a stepped hole) communicating with the bottom of the first groove 811 is provided at the center of the upper surface of the upper cover plate 81. The positioning hole 812 is used for positioning and installing the positioning tube 7. During the test, the modulated laser emitted by the laser 3 passes through the laser lens 5, the laser beam tube 6, the positioning tube 7, and the positioning hole 812 in sequence to reach the upper surface of the temperature-averaging plate 9 to be tested.

[0068] Before the test, temperature sensors are installed at different positions on the upper surface of the temperature averaging board 9 to be tested. The temperature sensors can be thermocouples, thermistors, etc., and the temperature sensors are attached to the temperature measurement positions on the upper surface of the temperature averaging board 9 to be tested using high temperature resistant tape. A plurality of wiring grooves 813 connected to the first groove 811 are provided on the circumference of the lower surface of the upper cover plate 81 for leading out the temperature sensor connection wires; the temperature sensor is connected to the data acquisition unit 2 for collecting temperature information at different positions of the temperature averaging board 9 to be tested and transmitting it to the data acquisition unit 2.

[0069] The lower cover plate 83 is installed on the bottom plate of the lower box body 42 by bolts. The bottom of the lower box body 42 is provided with through holes arranged in an array, which are used to adapt to test boxes 8 of different sizes (mainly the lower cover plate 83 of the test box) and bolt the test box 2. The upper surface of the lower cover plate 83 of the test box 8 is provided with a second groove 831 for installing the heat sink 82, and the upper surface of the temperature averaging plate 9 to be tested is in contact with the upper surface of the heat sink 82. During installation, the heat sink 82 is first installed in the second groove 831, and then the temperature averaging plate 9 to be tested is installed in the first groove 811. Finally, the upper cover plate 81 and the lower cover plate 83 are circumferentially locked and fixed, so that the temperature averaging plate 9 to be tested is fastened to the heat sink 82.

[0070] In order to reduce the interface contact thermal resistance between the temperature averaging plate 9 to be measured and the heat sink 82 , the upper surface of the heat sink 82 is provided with a thermally conductive silicone pad or coated with thermally conductive silicone grease.

[0071] The heat sink 82 of this embodiment is a water-cooled heat sink, which is connected to an external constant temperature water tank through a pipeline, and the constant temperature water tank provides a stable heat exchange circulation medium for the heat sink 82. At the same time, a flow meter 17 is also installed on the rack, which is connected to the water-cooled heat sink through a pipeline and is used to measure and adjust the circulating water flow of the water-cooled heat sink.

[0072] In order to improve the compactness of the system, the data acquisition unit 2, the laser 3, the flow meter 17, the inclination adjustment reducer 10, etc. are integrated on the frame 1 in this embodiment. For the convenience of operation, a detachable operation window 422 is provided on the side of the lower box 42 opposite to the fan 421 in this embodiment, and the vent 423 is located on the operation window 422, so that the operator can open the operation window 422 to manually adjust the positioning tube 7 to insert into the positioning hole 812 on the upper cover plate 81, so as to control the irradiation position of the laser.

[0073] Combination Figures 1 to 5 The working process of the temperature homogenizing plate test system based on modulated laser heating of the present invention is as follows:

[0074] (1) Before the test begins, first clean the surface of the temperature averaging plate 9 and the heat sink 82 to remove the oil on the surface. Install the heat sink 82 on the lower cover plate 83, connect the heat sink 82 to the flow meter 17 through a pipeline, and connect it to an external constant temperature water tank to provide a constant temperature heat exchange medium to the heat sink 82, and record the temperature of the constant temperature water tank as T f .

[0075] Next, the temperature averaging board 9 to be tested is installed on the heat sink 82. In order to reduce the interface contact thermal resistance between the temperature averaging board 9 to be tested and the heat sink 82, a thermal conductive silicone grease or a thermal conductive silicone pad is applied to the contact interface between the two. In order to improve the absorption of laser energy and reduce the difference in heat input of different specimen materials, a layer of laser absorbing material is sprayed on the irradiation position of the heating surface of the temperature averaging board 9 to be tested.

[0076] Afterwards, temperature sensors are evenly distributed at different positions on the heating surface (i.e., upper surface) of the temperature equalizing plate 9 to be tested, the temperature sensors are connected to the data acquisition unit 2, and then the upper cover 81 and the lower cover 83 are locked and fixed to achieve the installation of the test box 8.

[0077] (2) The test box 8 is mounted on the bottom plate of the lower box 42 and fixed through the threaded holes arranged in an array at the bottom of the lower box 42. Then, the upper box 41 is closed and the upper box 41 and the lower box 42 are connected and fixed by locks or bolts.

[0078] (3) Open the operating window 422 on the lower box body 42, manually adjust the position of the slide plate 15 on the upper box body 41 and the height of the positioning cylinder 7, so that the positioning cylinder 7 is inserted into the positioning hole 812 on the top of the upper cover plate 81, and then tighten the fixing bolts on the slide plate 15 and the positioning cylinder 7 respectively, and then adjust the inclination adjustment reducer 10 so that the box body 4 reaches the target inclination angle.

[0079] (4) Open the data acquisition unit 2 and collect the temperature data of the temperature sensors at the layout points, open the cooling water circulation of the external constant temperature water tank, adjust the flow meter 17 to control the operating water flow, and record the cooling water circulation water flow as Q f .

[0080] (5) Turn on the laser 3, set the laser output power P, frequency F and pulse duty cycle D of the laser output, and turn on the laser light. At this time, the laser 3 irradiates the modulated laser energy on the temperature-averaging board 9 to be tested through the laser lens 5. After the temperature change collected by the data acquisition unit 2 is stable, take the hot surface test temperature T of the temperature-averaging board 9 to be tested. i , i=1,2,3,……,n, n represents the number of temperature sensors, then the average hot surface temperature of the temperature averaging plate 9 to be measured is Right now:

[0081]

[0082] The thermal resistance R is used as the basis for evaluating the thermal performance of the temperature vapor chamber 9 to be tested. According to the above results, the thermal resistance R of the temperature vapor chamber 9 to be tested under the above specific test conditions can be calculated by the following formula:

[0083]

[0084] This completes the test of the thermal resistance of the temperature spreader.

[0085] The present invention uses laser as the heating source and adopts a modulated transient laser form to directly irradiate the surface of the test specimen. The laser does not have the thermal capacity of the heater, and the heating rising and falling edges are extremely short, avoiding the significant thermal capacity effect of the metal resistance heater. It can restore the transient changes of high heat flux in the application scenario on the surface of the specimen, and has good testability for the heat transfer performance test of the temperature equalizing plate under transient heat source conditions.

[0086] In addition, the test of the present invention has good economical efficiency, does not damage the test object, has strong design portability, and can be widely used in laser-type thermal tests.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A temperature chamber test system based on modulated laser heating, characterized in that: It comprises a frame (1), a test unit and a data acquisition unit (2); The test unit comprises a laser (3), a box (4), a laser lens (5), a laser beam tube (6), a positioning tube (7) and a test box (8); The laser (3) is mounted on the frame (1) and is used to emit modulated laser light of specific energy; the box (4) is mounted on the top of the frame (1); the laser lens (5) is mounted on the top of the box (4) through a support adjustment component, and the upper end is connected to the laser (3); The laser beam tube (6), the positioning tube (7), and the test box (8) are all located in the box (4) and are connected in sequence from top to bottom; the laser beam tube (6) is installed on the top of the box (4) and the upper end thereof extends out of the box (4); the lower end of the laser lens (5) extends from the upper end of the laser beam tube (6) into the laser beam tube (6) and is adaptively connected to the laser beam tube (6); the test box (8) is installed at the bottom of the box (4), and the interior thereof is used to place the temperature equalizing plate (9) to be tested; at least one temperature sensor is provided in the test box (8) and is used to be installed at different positions on the temperature equalizing plate (9) to be tested; The data acquisition unit (2) is connected to each temperature sensor respectively, and is used to obtain temperature information of the temperature equalizing plate (9) to be tested.

2. The temperature homogenizing plate test system based on modulated laser heating according to claim 1, characterized in that: It also includes an inclination adjustment reducer (10); A suspension (11) is installed on the top of the frame (1), and the inclination adjustment reducer (10) and the box (4) are both installed on the suspension (11); the inclination adjustment reducer (10) and the box (4) are connected to adjust the installation angle of the box (4).

3. The temperature homogenizing plate test system based on modulated laser heating according to claim 1 or 2, characterized in that: The support adjustment assembly is located on the top outer side of the box body (4), and includes a lens fixing bracket (12), a vertical plate bracket (13), two side plate brackets (14), a slide plate (15) and two slide rails (16); The two slide rails (16) are parallel to each other and are horizontally mounted on the top of the box (4); the slide plate (15) is located between the two slide rails (16) and is slidably connected thereto; a first mounting hole (151) is provided at the center of the slide plate (15); the upper end of the laser beam tube (6) extends out of the box (4) and the first mounting hole (151) and is then mounted on the slide plate (15); The two side plate brackets (14) have the same structure, are parallel to each other and are vertically installed on the slide plate (15); the vertical plate bracket (13) is vertically installed between the two side plate brackets (14) and is vertically connected to the two side plate brackets (14) respectively; The lens fixing bracket (12) is mounted on the upper end of one side of the vertical plate bracket (13) and is parallel to the slide plate (15); a second mounting hole (121) opposite to the first mounting hole (151) is provided at the center of the lens fixing bracket (12) for mounting the laser lens (5).

4. The temperature homogenizing plate testing system based on modulated laser heating according to claim 3, characterized in that: The vertical plate bracket (13) is provided with a transverse waist-shaped hole connected to the lens fixing bracket (12), which is used to adjust the transverse installation position of the lens fixing bracket (12) to achieve adjustment of the transverse installation position of the laser lens (5); Arc-shaped mounting holes are respectively provided at corresponding positions where the upper and lower sides of the side plate bracket (14) are connected to the vertical plate bracket (13), and are used to adjust the mounting angle of the vertical plate bracket (13), thereby adjusting the mounting angle of the laser lens (5).

5. The temperature homogenizing plate testing system based on modulated laser heating according to claim 4, characterized in that: The box body (4) comprises an upper box body (41) and a lower box body (42); the upper box body (41) and the lower box body (42) are connected to each other, and one end close to each other is open; The two slide rails (16) are respectively installed on the outside of the top cover of the upper box body (41); an elliptical adjustment hole (411) opposite to the first installation hole (151) is provided at the center of the top cover of the upper box body (41); and the length direction of the adjustment hole (411) is consistent with the sliding direction of the slide plate (15); The test box (8) is mounted on the bottom plate of the lower box body (42); a fan (421) is mounted on one side wall of the lower box body (42), and a detachable operation window (422) is mounted on the other side wall opposite to the fan (421); the operation window (422) is provided with a ventilation opening (423) opposite to the fan (421).

6. The temperature homogenizing plate testing system based on modulated laser heating according to claim 5, characterized in that: A laser protection plate (412) is installed on the inner side of the top of the upper box body (41), and a through hole (413) corresponding to the adjustment hole (411) is provided at the center of the laser protection plate (412).

7. The temperature homogenizing plate testing system based on modulated laser heating according to claim 6, characterized in that: The test box (8) comprises an upper cover plate (81), a heat sink (82) and a lower cover plate (83); the upper cover plate (81) and the lower cover plate (83) are connected, and the heat sink (82) is located between the two; A first groove (811) is provided at the center of the lower surface of the upper cover plate (81) for placing the temperature-averaging plate (9) to be tested; a positioning hole (812) is provided at the center of the upper surface of the upper cover plate (81) and is connected to the bottom of the first groove (811); the positioning hole (812) is used for positioning and installing the positioning cylinder (7); during testing, the modulated laser emitted by the laser (3) passes through the laser lens (5), the laser beam tube (6), the positioning tube (7), and the positioning hole (812) in sequence before reaching the upper surface of the temperature-averaging plate (9) to be tested; The temperature sensor is located in the first groove (811) and is installed on the upper surface of the temperature equalizing plate (9) to be measured; a plurality of wiring grooves (813) in communication with the first groove (811) are provided in the circumferential direction of the lower surface of the upper cover plate (81) for leading out the temperature sensor connection wires; The lower cover plate (83) is mounted on the bottom plate of the lower box body (42), and a second groove (831) is provided on its upper surface for mounting the heat sink (82).

8. The temperature homogenizing plate testing system based on modulated laser heating according to claim 7, characterized in that: Also included is a flow meter (17) mounted on the frame (1); The heat sink (82) is a water-cooled heat sink, and the flow meter (17) is connected to the water-cooled heat sink via a pipeline.

9. The temperature homogenizing plate testing system based on modulated laser heating according to claim 8, characterized in that: The upper surface of the heat sink (82) is provided with a thermally conductive silicone pad or coated with thermally conductive silicone grease.

10. The temperature chamber testing system based on modulated laser heating according to claim 1, characterized in that: The laser beam tube (6) and the positioning tube (7) are hollow structures in the circumference; The laser (3) is connected to the upper end of the laser lens (5) via an optical fiber.

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