Schlieren measurement system

Abstract

The invention relates to a schlieren measurement system. The schlieren measurement system comprises a light emitter, a receiver and a test area. The light emitter comprises a shell, and a light emitting assembly and a cooling assembly which are arranged in the shell; the light-emitting assembly is used for emitting a measuring light beam; the cooling assembly is used for cooling the light-emitting assembly; the receiver is arranged at the downstream of the light emitter, and the receiver and the axis of the measuring light beam are coaxially arranged; the test area is arranged between the illuminator and the receiver; wherein the receiver is used for receiving the measurement light beam passing through the test area. When the schlieren measurement system is applied to the combustion area of the aero-engine for schlieren measurement, the light-emitting component and the cooling component are integrated in the shell, so that the schlieren measurement system can be conveniently moved to the combustion part of the aero-engine for field test; compared with a traditional operation mode of building a whole schlieren measurement system in a laboratory and continuously iterating and repeatedly adjusting an optical path system, the measurement of the combustion area of the aero-engine is more convenient and time-saving.

Description

Technical Field

[0001] The present application relates to the technical field of schlieren measurement, and in particular to a schlieren measurement system. Background Art

[0002] The Schlieren measurement system uses the basic principle that the refractive index gradient of light in the flow field is proportional to the flow field density to perform measurements, thereby ultimately obtaining experimental results such as the flow field wave structure, shock wave / boundary layer complex interference characteristics, etc. Traditional Schlieren measurement systems are usually built in laboratories, and require continuous iterations and repeated adjustments to the optical path system. However, due to the limitations of the test site and test environment, it is difficult to measure in the combustion area of ​​aircraft engines, and the accuracy of the test results is poor, making it difficult to provide important technical support for the development of aircraft engine combustion components. Summary of the invention

[0003] Based on this, it is necessary to provide a schlieren measurement system to address the problem that the existing schlieren measurement system is difficult to measure the combustion area of ​​an aircraft engine and the accuracy of the test results is poor.

[0004] In a first aspect, the present application provides a schlieren measurement system, which includes a light emitter, a receiver, and a test area. The light emitter includes a housing, a light emitting component and a cooling component disposed in the housing; the light emitting component is used to emit a measurement beam; the cooling component is used to cool the light emitting component; the receiver is disposed downstream of the light emitter, and the receiver is coaxially disposed with the axis of the measurement beam; the test area is disposed between the light emitter and the receiver; wherein the receiver is used to receive the measurement beam passing through the test area.

[0005] In some embodiments, the light emitting assembly includes a light source and a collimator. The light source is used to emit a point light beam; the collimator is disposed downstream of the light source and is used to adjust the point light beam emitted by the light source to be parallel to form the measurement light beam.

[0006] In some embodiments, the cooling component is disposed at the periphery of the light source.

[0007] In some of these embodiments, the cooling assembly is disposed upstream of the light source.

[0008] In some of the embodiments, the cooling assembly and the light source are turned on and off in tandem.

[0009] In some of the embodiments, a heat dissipation slot is configured on the housing.

[0010] In some embodiments, the heat sink is disposed at the cooling component.

[0011] In some embodiments, along the axis of the measuring beam, the collimator can move closer to or farther from the light source.

[0012] In some of the embodiments, the light emitting component further includes a condenser; the condenser is disposed downstream of the light source, and the condenser is used to condense the point light beam emitted by the light source.

[0013] In some embodiments, along the axis of the measuring beam, the condenser can move toward or away from the light source.

[0014] In some embodiments, the distance d1 between the light source and the concentrator satisfies the condition: 35 mm ≤ d1 ≤ 50 mm.

[0015] In some embodiments, the light emitting component further includes a light limiter; the light limiter is disposed between the condenser and the collimator, and the light limiter is used to limit the amount of light passing through its own aperture.

[0016] In some embodiments, along the axis of the measuring beam, the light limiter can move closer to or farther from the light concentrator.

[0017] In some embodiments, the distance d2 between the light limiter and the light concentrator satisfies the condition: 22 mm≤d2≤32 mm.

[0018] In some embodiments, a distance d3 between the light limiter and the parallel light instrument satisfies the condition: 300 mm≤d3≤400 mm.

[0019] When the above-mentioned schlieren measurement system is applied to the combustion zone of an aircraft engine for schlieren measurement, since the light-emitting component and the cooling component are all integrated in the shell, the schlieren measurement system can be portable and mobile, so it can be more conveniently moved to the combustion components of the aircraft engine for on-site testing. Compared with the traditional operation method of building the entire schlieren measurement system in the laboratory and continuously iterating and repeatedly adjusting the optical path system, the schlieren measurement system of the present application not only occupies less space but is also more convenient and time-saving when measuring the combustion area of ​​the aircraft engine; at the same time, since a cooling component for cooling and dissipating the light-emitting component is provided in the shell, the entire light-emitting component no longer relies on an external cooling source in the laboratory to cool it, thereby reducing the interference of the airflow of the external cooling source on the flow field of the combustion area, making the test results of the schlieren measurement more accurate, thereby providing important and reliable technical support for the development of aircraft engine combustion components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Schematic diagram of a schlieren measurement system provided for some embodiments of the present application.

[0021] Figure 2 for Figure 1 Internal schematic diagram of the light emitter in the schlieren measurement system shown.

[0022] Figure 3 for Figure 1 Schematic diagram of the light emitter shown.

[0023] Figure numerals: 100-light emitter; 110-housing; 111-accommodating cavity; 112-heat sink; 120-light emitting assembly; 121-light source; 122-parallelizer; 123-condenser; 124-light limiter; 124a-aperture; 125-measuring beam; 125a-spot beam; 130-cooling assembly; 200-receiver; 300-testing area; 400-plano-convex lens; 500-knife-edge instrument; 600-power supply. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0030] See also Figure 1 , Figure 3 Combined with Figure 2 , Figure 1 A schematic diagram of a schlieren measurement system provided in some embodiments of the present application is shown. Figure 2 Shows Figure 1 An internal schematic diagram of the light emitter 100 in the schlieren measurement system is shown. Figure 3 Shows Figure 1Schematic diagram of the light emitter 100 shown. A schlieren measurement system provided in one embodiment of the present application includes a light emitter 100, a receiver 200 and a test area 300. The light emitter 100 includes a housing 110 and a light emitting component 120 and a cooling component 130 disposed in the housing 110; the light emitting component 120 is used to emit a measuring light beam 125; the cooling component 130 is used to cool and dissipate heat for the light emitting component 120; the receiver 200 is disposed downstream of the light emitter 100, and the receiver 200 is coaxially disposed with the axis of the measuring light beam 125; the test area 300 is disposed between the light emitter 100 and the receiver 200; wherein the receiver 200 is used to receive the measuring light beam 125 passing through the test area 300.

[0031] When the schlieren measurement system provided in the embodiment of the present application is applied to the combustion zone of an aircraft engine for schlieren measurement, since the light-emitting component 120 is fully integrated in the shell 110, the schlieren measurement system can be portable and mobile, so it can be more conveniently moved to the combustion components of the aircraft engine for on-site testing. Compared with the traditional operation method of building the entire schlieren measurement system in the laboratory and continuously iterating and repeatedly adjusting the optical path system, the schlieren measurement system of the present application not only occupies less space but is also more convenient and time-saving when measuring the combustion area of ​​the aircraft engine. At the same time, since a cooling component 130 for cooling and dissipating the light-emitting component 120 is provided in the shell 110, the entire light-emitting component 120 no longer relies on an external cooling source in the laboratory for cooling it, thereby reducing the interference of the airflow of the external cooling source on the flow field of the combustion area, making the test results of the schlieren measurement more accurate, thereby providing important and reliable technical support for the development of aircraft engine combustion components.

[0032] It should be noted that, due to the high temperature of the aircraft engine combustion area, the temperature of the measurement environment is also high when the schlieren measurement is performed on the aircraft engine combustion area. The traditional schlieren measurement system is directly connected in the laboratory, so it relies more on the external cooling source in the laboratory to cool the schlieren measurement system. The cold air blown by the external cooling source will interfere with the flow field in the entire laboratory, thereby reducing the accuracy of the flow field measurement in the aircraft engine combustion area.

[0033] The cooling assembly 130 may be a cooling structure such as a fan or an air conditioner. The number of cooling assemblies 130 may be one or more, and there is no special limitation on this. Figure 2 In some embodiments, the cooling assembly 130 includes two fans that are spaced apart from each other, and the two fans are respectively disposed on both sides of the axis direction of the measuring beam 125 .

[0034] The receiver 200 may use a camera with a high frame rate. In some embodiments, the frame rate of the receiver 200 is higher than 10,000 frames, so that the measurement result of the combustion area of ​​the aircraft engine is more accurate.

[0035] In some embodiments, the housing 110 is configured with a receiving cavity 111 , and the light emitting component 120 is received in the receiving cavity 111 .

[0036] It should be noted that the schlieren measurement system provided in the present application is not limited to application in aircraft engines, but can also be applied to any other experiments requiring measurement of flow field data, such as internal combustion engines.

[0037] The structure of the schlieren measurement system is described in detail below.

[0038] See also Figure 2 In some embodiments, the Schlieren measurement system further includes a plano-convex lens 400 and a knife-edge gauge 500 sequentially arranged along the axis of the measuring beam 125, the plano-convex lens 400 and the knife-edge gauge 500 being arranged between the test community and the receiver 200, and the plano-convex lens 400 being arranged above the knife-edge gauge 500. After the measuring beam 125 passes through the test area 300, it passes through the plano-convex lens 400 and the knife-edge gauge 500 in sequence, and is finally received by the receiver 200. The plano-convex lens 400 is used to focus the measuring beam 125 passing through the test area 300, and the density gradient change in the flow field can be converted into a change in light intensity by focusing, thereby forming a Schlieren image. The knife-edge gauge 500 partially blocks the light of the measuring beam 125 passing through it to form a Schlieren image with light and dark contrast, and adjusts the contrast of the Schlieren image by adjusting the position of the knife-edge gauge 500, thereby enhancing the visualization effect of the density gradient.

[0039] See also Figure 2 In some embodiments, the light emitting assembly 120 includes a light source 121 and a collimator 122. The light source 121 is used to emit a point light beam 125a; the collimator 122 is disposed downstream of the light source 121, and is used to adjust the point light beam 125a emitted by the light source 121 to be parallel to form a measuring light beam 125.

[0040] The light source 121 may be a point light source 121, and the light beam emitted by the light source 121 is a point light beam 125a. The point light beam 125a emitted by the light source 121 is collimated by a parallel light meter 122, so that when the measuring light beam 125 irradiated to the test area 300 performs schlieren measurement, it is ensured that the measuring light beam 125 remains parallel when passing through the flow field of the test area 300, so that when encountering a density gradient change in the flow field, the refraction of the light can be effectively detected and recorded.

[0041] In some embodiments, the housing 110 is further provided with a snap-in hole connected to the accommodating cavity 111, and one end of the collimator 122 outputting the measuring light beam 125 partially extends out of the housing 110 through the snap-in hole. The collimator 122 can slightly rotate relative to the hole wall of the snap-in hole, so that the various components of the integrated light emitting assembly 120 can be easily adjusted coaxially.

[0042] See also Figure 2 In some embodiments, the cooling assembly 130 is disposed on the periphery of the light source 121 .

[0043] The present application arranges the cooling assembly 130 at the periphery of the light source 121, so that the cooling assembly 130 can timely cool down and dissipate the heat of the light source 121 with a high temperature during the operation of the light source 121, thereby reducing the measurement error and use danger caused by the excessive temperature of the light source 121. Therefore, it is not necessary to set up other external cooling sources such as air conditioners at the periphery of the combustion area of ​​the aircraft engine for cooling, which effectively ensures the accuracy and use safety of the flow field measurement in the combustion area of ​​the aircraft engine.

[0044] See also Figure 2 In some embodiments, the cooling assembly 130 is disposed upstream of the light source 121. By disposing the cooling assembly 130 upstream of the light source 121, when the cooling assembly 130 cools the light source 121, the light path interference and density gradient change of the point light beam 125a emitted by the light source 121 are reduced, so that the collimation degree of the finally formed measurement light beam 125 is higher.

[0045] In some embodiments, the cooling assembly 130 and the light source 121 are turned on and off in conjunction. The cooling assembly 130 and the light source 121 can be connected in series in one circuit, or connected in parallel in two circuits and controlled by a switch. Thus, the cooling assembly 130 and the light source 121 are turned on and off in conjunction, effectively ensuring the heat dissipation effect of the light source 121.

[0046] See also Figure 2 In some embodiments, the schlieren measurement system further includes a power supply 600 , and the light source 121 and the cooling component 130 are electrically connected to the power supply 600 , respectively, so that the light source 121 and the cooling component 130 are powered by the power supply 600 .

[0047] See also Figure 3In some embodiments, a heat dissipation slot 112 is configured on the housing 110. A plurality of heat dissipation slots 112 arranged at intervals may be provided on the housing 110, and the shape of the heat dissipation slot 112 may be a rectangular strip structure. By providing the heat dissipation slot 112 on the housing 110, the cooling assembly 130 disposed inside the housing 110 can timely perform heat exchange between the inside and outside of the housing 110 through the heat dissipation slot 112 when dissipating heat from the light source 121, thereby effectively reducing the temperature inside the housing 110.

[0048] See also Figure 3 In some embodiments, the heat dissipation slot 112 is disposed at the cooling assembly 130. By dissipating the heat dissipation slot 112 at the cooling assembly 130, when the cooling assembly 130 starts to dissipate heat from the light source 121, the heat dissipation slot 112 close to its own structure can be dissipated in time, thereby effectively ensuring the heat dissipation effect.

[0049] In some embodiments, along the axis of the measuring beam 125, the collimator 122 can move closer to or farther from the light source 121. Specifically, the axis of the measuring beam 125 is Figure 1 and Figure 2 The p line in Figure 1 and Figure 2 Since the collimator 122 can move towards or away from the light source 121, the distance between the collimator 122 and the light source 121 can be adjusted, so that when the light source 121 emits a point light beam 125a, the distance between the collimator 122 and the light source 121 can be adjusted to obtain a measurement light beam 125 with a better parallel effect.

[0050] In one specific embodiment, the collimator 122 can be adjusted 10 mm upstream and downstream along the axis of the measuring light beam 125. Specifically, the upstream adjustment is to move closer to the light source 121; the downstream adjustment is to move away from the light source 121. By limiting the adjustment range of the collimator 122 to 10 mm upstream and 10 mm downstream, the position of the collimator 122 on the axis can meet the adjustment range of the focal length of the entire optical path system, which is conducive to ensuring the parallel collimation of the measuring light beam 125.

[0051] See also Figure 2In some embodiments, the light emitting assembly 120 further includes a condenser 123; the condenser 123 is disposed downstream of the light source 121, and is used to perform a condensing operation on the point light beam 125a emitted by the light source 121. The condenser 123 performs a condensing operation on the point light beam 125a emitted by the light source 121, thereby converging the point light beam 125a emitted by the light source 121 into a parallel light beam, and the condensing effect of the condenser 123 increases the light intensity of the light beam passing through the condenser 123, thereby increasing the brightness and contrast of the finally formed schlieren image.

[0052] Please note that Figure 2 The concentrator 123 is usually composed of at least one lens, and the number of lenses can be adaptively adjusted according to the required focusing effect, and there is no special limitation on this. Figure 2 In some specific embodiments, the concentrator 123 is a biconvex lens.

[0053] In some of the embodiments, the focal length of the condenser 123 is adjustable so as to adapt to different light sources 121 and test distances.

[0054] In some embodiments, along the axis of the measuring beam 125, the condenser 123 can move closer to or farther from the light source 121. Specifically, the axis of the measuring beam 125 is Figure 1 and Figure 2 The p line in Figure 1 and Figure 2 Since the condenser 123 can move towards or away from the light source 121, the distance between the condenser 123 and the light source 121 can be adjusted, so that when the light source 121 emits a point light beam 125a, the distance between the condenser 123 and the light source 121 can be adjusted to obtain a better parallel measurement light beam 125.

[0055] In one specific embodiment, the condenser 123 can be adjusted 5 mm upstream and downstream along the axis of the measuring light beam 125. Specifically, the upstream adjustment is to move closer to the light source 121; the downstream adjustment is to move away from the light source 121. By limiting the adjustment range of the condenser 123 to 5 mm upstream and 5 mm downstream, the position of the condenser 123 on the axis can meet the adjustment range of the focal length of the entire optical path system, which is conducive to ensuring the parallel collimation of the measuring light beam 125.

[0056] See also Figure 2In some embodiments, the distance d1 between the light source 121 and the concentrator 123 satisfies the condition: 35mm≤d1≤50mm. By setting the distance d1 between the light source 121 and the concentrator 123 to be greater than or equal to 35mm and less than or equal to 50mm, the distance between the light source 121 and the concentrator 123 can meet the adjustment range of the focal length of the entire optical path system, which is conducive to ensuring the parallel collimation of the measurement light beam 125. Specifically, when a different light source 121 is replaced, or the installation position of the light source 121 changes, the beam width or brightness of the point light beam 125a entering the concentrator 123 can be changed by adjusting the distance between the light source 121 and the concentrator 123, which has higher adaptability.

[0057] In one specific embodiment, the distance between the light source 121 and the condenser 123 is 35 mm. In another specific embodiment, the distance between the light source 121 and the condenser 123 is 50 mm. In another specific embodiment, the distance between the light source 121 and the condenser 123 is 40 mm.

[0058] See also Figure 2 In some embodiments, the light emitting component 120 further includes a light limiter 124; the light limiter 124 is disposed between the condenser 123 and the collimator 122, and the light limiter 124 is used to limit the amount of light passing through its own aperture 124a. An aperture 124a is disposed on the light limiter 124, and the aperture 124a can be a circular aperture 124a or a slit aperture 124a, and there is no special limitation on this. By providing the light limiter 124 and making the light limiter 124 disposed between the condenser 123 and the collimator 122, when the point light beam 125a emitted by the light source 121 passes through the condenser 123 for focusing operation, the light limiter 124 limits the amount of light entering the measuring community, thereby improving the contrast and resolution of the schlieren image acquired by the final receiver 200.

[0059] In some embodiments, along the axis of the measuring beam 125, the light limiter 124 can move closer to or farther from the condenser 123. Specifically, the axis of the measuring beam 125 is Figure 1 and Figure 2 The p line in Figure 1 and Figure 2 By adjusting the distance between the light limiter 124 and the condenser 123, the contrast of the schlieren image acquired by the receiver 200 can be adjusted, so that the density gradient change is more obvious.

[0060] In one specific embodiment, the light limiter 124 can be adjusted 5 mm upstream and downstream along the axis of the measuring light beam 125. Specifically, the upstream adjustment is to move closer to the condenser 123; the downstream adjustment is to move away from the condenser 123. By limiting the adjustment range of the light limiter 124 to 5 mm upstream and 5 mm downstream, the position of the light limiter 124 on the axis can meet the adjustment range of the focal length of the entire optical path system, which is conducive to ensuring the parallel collimation of the measuring light beam 125.

[0061] In one specific embodiment, the aperture 124a is a circular aperture 124a, and the aperture of the circular aperture 124a is adjustable to 0-6 mm.

[0062] In another specific embodiment, the diaphragm 124a is a slit diaphragm 124a, and the slit width of the slit diaphragm 124a is adjustable to 0-6 mm.

[0063] See also Figure 2 In some embodiments, the distance d2 between the light limiter 124 and the condenser 123 satisfies the condition: 22 mm ≤ d2 ≤ 32 mm. By setting the distance d2 between the light limiter 124 and the condenser 123 to be within a range of greater than or equal to 22 mm and less than or equal to 32 mm, the distance between the light limiter 124 and the condenser 123 can meet the adjustment range of the focal length of the optical path system, which is conducive to ensuring the parallel collimation of the measurement light beam 125.

[0064] In one specific embodiment, the distance between the light limiter 124 and the condenser 123 is 22 mm. In another specific embodiment, the distance between the light limiter 124 and the condenser 123 is 32 mm. In another specific embodiment, the distance between the light limiter 124 and the condenser 123 is 26 mm.

[0065] See also Figure 2 In some embodiments, the distance d3 between the light limiter 124 and the collimator 122 satisfies the condition: 300 mm ≤ d3 ≤ 400 mm. By setting the distance d3 between the light limiter 124 and the collimator 122 to be greater than or equal to 300 mm and less than or equal to 400 mm, the distance d3 between the light limiter 124 and the collimator 122 can meet the adjustment range of the focal length of the optical path system, which is useful for ensuring the parallel collimation of the measurement light beam 125.

[0066] In one specific embodiment, the distance between the light limiter 124 and the collimator 122 is 300 mm. In another specific embodiment, the distance between the light limiter 124 and the collimator 122 is 400 mm. In another specific embodiment, the distance between the light limiter 124 and the collimator 122 is 350 mm.

[0067] The schlieren measurement system provided in the present application integrates the entire light-emitting component 120 and the cooling component 130 into the light emitter 100, and arranges the cooling component 130 on the periphery of the light source 121 in the light emitter 100, so that the schlieren measurement system can be portable and applied to the flow field display in the combustion area of ​​an aircraft engine, which not only occupies less space but is also more convenient and time-saving; at the same time, it can also make the flow field in the combustion area of ​​the aircraft engine less susceptible to the influence of external airflow, so that the experimental data of the relevant characteristics of the engine combustion components can be quickly obtained in a confined space and a high temperature environment, and the experimental data finally obtained is also of high accuracy.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A Schlieren measurement system, characterized in that: The Schlieren measurement system comprises: A light emitter (100) comprising a housing (110) and a light emitting component (120) and a cooling component (130) arranged in the housing (110); the light emitting component (120) is used to emit a measuring light beam (125); and the cooling component (130) is used to cool and dissipate heat for the light emitting component (120); A receiver (200) is arranged downstream of the light emitter (100), the receiver (200) being arranged coaxially with the axis of the measuring light beam (125); A test area (300), the test area (300) being arranged between the light emitter (100) and the receiver (200); The receiver (200) is used to receive the measuring light beam (125) passing through the test area (300).

2. The Schlieren measurement system according to claim 1, characterized in that: The light emitting component (120) comprises: A light source (121), the light source (121) being used to emit a point light beam (125a); A parallel light meter (122), the parallel light meter (122) being arranged downstream of the light source (121), the parallel light meter (122) being used to adjust the point light beam (125a) emitted by the light source (121) in parallel so as to form the measurement light beam (125).

3. The Schlieren measurement system according to claim 2, characterized in that: The cooling component (130) is arranged on the periphery of the light source (121).

4. The Schlieren measurement system according to claim 2, characterized in that: The cooling component (130) is arranged upstream of the light source (121); The cooling component (130) and the light source (121) are opened and closed in a coordinated manner.

5. The Schlieren measurement system according to claim 2, characterized in that: Along the axis of the measuring light beam (125), the collimator (122) can move closer to or farther from the light source (121).

6. The Schlieren measurement system according to claim 2, characterized in that: The light emitting assembly (120) further includes a condenser (123); The condenser (123) is arranged downstream of the light source (121), and the condenser (123) is used to perform a condensing operation on the point light beam (125a) emitted by the light source (121).

7. The Schlieren measurement system according to claim 6, characterized in that: Along the axis of the measuring light beam (125), the condenser (123) can move towards or away from the light source (121); The distance d1 between the condenser (123) and the light source (121) satisfies the condition: 35mm≤d1≤50mm.

8. The Schlieren measurement system according to claim 6, characterized in that: The light-emitting component (120) further includes a light limiter (124); The light limiter (124) is arranged between the condenser (123) and the collimator (122), and the light limiter (124) is used to limit the amount of light passing through its own aperture (124a).

9. The Schlieren measurement system according to claim 8, characterized in that: Along the axis of the measuring light beam (125), the light limiter (124) can move towards or away from the light condenser (123); The distance d2 between the light limiter (124) and the light condenser (123) satisfies the condition: 22mm≤d2≤32mm; The distance d3 between the light limiter (124) and the collimator (122) satisfies the condition: 300mm≤d3≤400mm.

10. The Schlieren measurement system according to any one of claims 1 to 9, characterized in that: The housing (110) is provided with a heat dissipation slot (112); The heat dissipation slot (112) is arranged at the cooling component (130).

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