Mesoscale dry bending temperature control test device

Abstract

The utility model relates to a mesoscale dry koji temperature control test device which comprises a test cavity, a temperature controller and an air supply assembly, and the interior of the test cavity is a hollow cavity and is used for accommodating dry koji; the temperature controller extends into the test cavity, the temperature controller heats the dry koji in a manner of direct contact with the dry koji through the part extending into the test cavity, and the temperature controller is also used for monitoring the temperature of the dry koji in real time; the gas supply assembly extends into the test cavity and is used for introducing oxygen into the test cavity. By adopting the scheme, a dry yeast sample in the test cavity is directly heated and subjected to temperature monitoring through the temperature controller, and in the reaction process, as the gas supply assembly further extends into the test cavity, oxygen can be introduced into the test cavity through the gas supply assembly, so that sufficient oxygen can be conveniently provided when the dry yeast is subjected to oxidation reaction; in conclusion, the device disclosed by the utility model can be used for controlling the temperature of the dry koji and also can be used for ensuring that the dry koji can be subjected to sufficient oxidation reaction.

Description

Technical Field

[0001] This utility model relates to the technical field of dry curing experimental devices, and in particular to a medium-scale dry curing temperature control experimental device. Background Technology

[0002] During the storage of dried koji, under certain specific conditions, accidents such as carbonization, smoldering, and even fire can occur, causing significant losses in the event of a fire. Dried koji is stored in two forms: dried koji and moist koji. Under specific moisture and environmental conditions, the fermentation reaction of some fungi and bacteria in moist koji will cause the temperature to continue to rise. When the temperature exceeds the fermentation temperature threshold, a large number of microorganisms die, and fermentation and heat production cease. However, under certain conditions, as the temperature rises, the oxidation reaction in dried koji becomes increasingly intense, thus dominating and causing the temperature to continue to rise, ultimately leading to smoldering. Therefore, it is urgent to understand the constraints of the exothermic oxidation reaction in dried koji and to identify its key influencing factors and thresholds through experiments, which will help prevent such accidents. Isothermal control experimental devices will be used in this process.

[0003] Isothermal control experimental devices have been used in many experimental fields for many years, such as chemical reactions, physical property analysis, heat transfer, and heat conduction. Currently, there are two main technologies similar to this patent: micro-calorimeters and isothermal chambers. The former is mainly used for small-scale experimental analysis, while the latter has a maximum scale of 1000L and can control temperatures between -70 and 150℃.

[0004] Commonly used isothermal control experimental devices include: (1) a micro calorimeter, which uses a 3D sensor based on the Calvier calorimetry principle to detect the thermal effect of the sample from all directions. It integrates isothermal and scanning functions, is equipped with multiple sample cells, and has functions such as mixing, stirring, and quantitative sample addition. Its maximum sample volume (12.5ml) is a reaction vessel; (2) a constant temperature experimental chamber, which distributes heating elements evenly in the inner liner to preheat the inner wall of the chamber, and then uses heat transfer and forced fan convection to ensure that the temperature at each point in the chamber can accurately reach and maintain the set value, thereby ensuring a uniform temperature distribution in the chamber. The airflow circulation system fully ensures the continuous stability of the temperature in the working chamber, the wind speed is adjustable, and it has a fan switch function. When the temperature set by the customer is reached, it provides a perfect environment for sample baking / cultivation. Adaptive PID program control accurately controls the temperature, prevents temperature overshoot, and maintains a uniform and constant temperature in the chamber.

[0005] The above devices have the following drawbacks: For micro calorimeters, the need for precise calorimetry and other functional limitations restricts their reaction vessel space, with a maximum sample volume of 12.5 ml, limiting them to small-scale experiments and preventing the development of medium-scale (above 300 L) experiments; for constant temperature chambers, the closed environment during experiments (gas exchange reduces their heat preservation capacity) prevents gas exchange between the sample and the outside environment, resulting in a lack of oxygen supply and making them unsuitable for oxidation reaction experiments; furthermore, because the heating element is located on the wall, uneven heating can easily occur for samples with poor thermal conductivity, significantly affecting the accuracy of experimental results and making them unsuitable for dry-processed substances. Utility Model Content

[0006] Based on this, a mesoscale dry curing temperature control test device is provided to solve the problem that the oxidation reaction of dry curing cannot be monitored in a mesoscale test device in the prior art.

[0007] On the one hand, this utility model provides a medium-scale dry curing temperature control test device, the test device comprising:

[0008] The test chamber has a hollow interior and is used to contain the dry curing material.

[0009] The temperature controller extends into the test chamber and heats the dry koji by direct contact with the dry koji through the part that extends into the test chamber. The temperature controller is also used to monitor the temperature of the dry koji in real time.

[0010] The gas supply assembly extends into the test chamber and is used to introduce oxygen into the test chamber.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] In one implementation, the temperature controller includes:

[0013] The controller body is located outside the test chamber.

[0014] Heating mesh, which has an extended mesh structure, is located inside the test chamber;

[0015] The first connecting part has a heating mesh and a controller body connected to its two ends, respectively.

[0016] In one implementation, the heating mesh is formed into a hollow ring structure or a hollow rectangular structure.

[0017] In one implementation, the temperature controller also includes:

[0018] The first temperature sensor is located inside the test chamber and is used to detect the temperature of the dry curing material inside the test chamber.

[0019] The first temperature sensor is fixed on the second connection part, and one end of the second connection part is connected to the controller body.

[0020] In one implementation, there are multiple first temperature sensors, each extending into the test chamber at a different height, and the multiple first temperature sensors are used to measure the temperature at different heights of the dry curing.

[0021] In one implementation, the temperature controller also includes:

[0022] The second temperature sensor is fixed on the second connecting part and is in contact with or fixed to the heating mesh. The second temperature sensor is used to measure the temperature of the heating mesh.

[0023] In one implementation, both the first connecting part and the second connecting part extend into the test chamber along the top of the test chamber, the first temperature sensor is located in the middle of the test chamber, and the heating mesh is arranged in a ring and surrounds the first temperature sensor.

[0024] In one implementation, the gas supply component includes:

[0025] An air pump is used to supply gas;

[0026] The air delivery tube has one end inserted into the test chamber and the other end connected to the air pump.

[0027] In one implementation, one end of the air guide tube extends into the test chamber and is spirally arranged in the vertical direction, and the air guide tube surrounds the temperature controller. The part of the air guide tube located in the test chamber has multiple air outlets along its length.

[0028] In one implementation, the experimental setup also includes:

[0029] The insulation layer is evenly wrapped around and adhered to the outer wall of the test chamber.

[0030] The beneficial effects of this utility model are as follows: A test chamber is provided to accommodate the dried koji. Since the temperature controller extends into the test chamber and can contact the dried koji, the dried koji sample in the test chamber can be directly heated and its temperature monitored through the temperature controller. In other words, the temperature of the dried koji can be controlled through the temperature controller. During the reaction process, since a gas supply component also extends into the test chamber, oxygen can be introduced into the test chamber through the gas supply component, ensuring sufficient oxygen for the oxidation reaction of the dried koji. In summary, the device of this application can control the temperature of the dried koji while ensuring a sufficient oxidation reaction. Compared with the existing micro calorimeter, it increases the size of the test chamber for accommodating the dried koji and uses a lower-cost structure to achieve temperature control of the dried koji. Compared with a constant temperature test chamber, it achieves temperature control of the dried koji while simultaneously supplementing oxygen into the test chamber to ensure oxygen supply during the oxidation reaction of the dried koji. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a mesoscale dry curing temperature control test device in one embodiment.

[0032] In the attached diagram, the components represented by each number are as follows:

[0033] 10. Test chamber;

[0034] 21. Controller body; 22. Heating grid; 23. First connecting part; 24. First temperature sensor; 25. Second connecting part; 26. Second temperature sensor;

[0035] 31. Air pump; 32. Air delivery tube;

[0036] 40. Insulation layer. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0038] A mesoscale dry curing temperature control test device, see Figure 1 The test apparatus includes a test chamber 10, a temperature controller, and an air supply assembly. The interior of the test chamber 10 is a hollow cavity used to contain the dry curd. The temperature controller extends into the test chamber 10 and heats the dry curd by direct contact with the dry curd through the part extending into the test chamber 10. The temperature controller is also used to monitor the temperature of the dry curd in real time. The air supply assembly extends into the test chamber 10 and is used to introduce oxygen into the test chamber 10.

[0039] In this design, a test chamber 10 is provided to accommodate the dried koji. Since the temperature controller extends into the test chamber 10 and can contact the dried koji, it can directly heat and monitor the temperature of the dried koji sample within the test chamber 10. In other words, the temperature of the dried koji can be controlled through the temperature controller. During the reaction, since a gas supply component extends into the test chamber 10, oxygen can be introduced into the test chamber 10 through the gas supply component, ensuring sufficient oxygen for the oxidation reaction of the dried koji. In summary, the device of this application can control the temperature of the dried koji while ensuring a sufficient oxidation reaction. Compared to existing micro calorimeters, it increases the size of the test chamber 10 for accommodating the dried koji and uses a lower-cost structure to control the temperature of the dried koji. Compared to a constant-temperature test chamber, it achieves both temperature control and oxygen supply to the test chamber 10 to ensure oxygen supply during the oxidation reaction of the dried koji. In this design, the temperature controller extends into the test chamber 10, heating the dried koji through direct contact. In contrast, existing structures place the heating element on the wall, which can lead to uneven heating of the sample when its thermal conductivity is poor, affecting experimental results and accuracy, making them unsuitable for dried koji. The present application's design, by extending the temperature controller into the test chamber 10, allows for circumferential heating of the dried koji, increasing the direct heating area within the chamber and facilitating uniform heating, thus improving experimental accuracy.

[0040] Specifically, the gas supplied to the test chamber 10 by the gas supply component can be either oxygen or air.

[0041] In some embodiments of this application, the temperature controller includes a controller body 21, a heating mesh 22, and a first connecting part 23. The controller body 21 is located outside the test chamber 10; the heating mesh 22 has a mesh-like extended structure and is located inside the test chamber 10; the two ends of the first connecting part 23 are respectively connected to the heating mesh 22 and the controller body 21. Thus, by setting the heating mesh 22 to heat the dry koji, the contact area with the dry koji is increased; the mesh-like extended structure of the heating mesh 22 also facilitates heat conduction in the dry koji; the first connecting part 23 connects the heating mesh 22 and the controller body 21, making it convenient to control the heating temperature of the heating mesh 22, the opening of the heating mesh 22, and the closing of the heating mesh 22 through the controller body 21.

[0042] In some embodiments of this application, the heating mesh 22 is formed into a hollow annular structure or a hollow rectangular structure. This arrangement of the heating mesh 22 into a ring or rectangular structure effectively increases the contact area between the heating mesh 22 and the dry woven fabric, facilitating uniform heating of the surrounding dry woven fabric by the heating mesh 22.

[0043] In some embodiments of this application, the temperature controller further includes a first temperature sensor 24 and a second connecting part 25. The first temperature sensor 24 is located inside the test chamber 10 and is used to detect the temperature of the dried curd inside the test chamber 10. The first temperature sensor 24 is fixed to the second connecting part 25, and one end of the second connecting part 25 is connected to the controller body 21. In this way, the temperature of the dried curd inside the test chamber 10 can be measured in real time by setting the first temperature sensor 24.

[0044] In some embodiments of this application, there are multiple first temperature sensors 24, and each first temperature sensor 24 extends into the test chamber 10 at a different height. The multiple first temperature sensors 24 are used to measure the temperature at different heights of the dried curd. In this way, by setting multiple first temperature sensors 24, it is convenient to measure the temperature of the stacked dried curd at different heights in the vertical direction, thereby reducing the temperature error caused by single-point measurement, and also reflecting the temperature change of the dried curd at different heights when the temperature controller is heating.

[0045] Specifically, the number of first temperature sensors 24 arranged vertically can be seven.

[0046] In some embodiments of this application, the temperature controller further includes a second temperature sensor 26, which is fixed to the second connecting portion 25. The second temperature sensor 26 abuts against or is fixed to the heating grid 22, and is used to measure the temperature of the heating grid 22. By setting the second temperature sensor 26 to abut against or be fixed to the heating grid 22, the temperature measured by the second temperature sensor 26 becomes the temperature of the heating grid 22, facilitating real-time control and adjustment of the temperature of the heating grid 22 by the temperature controller. Furthermore, fixing the second temperature sensor 26 to the second connecting portion 25 allows both the first temperature sensor 24 and the second temperature sensor 26 to be connected simultaneously to the second connecting portion 25, thereby reducing the wiring within the test chamber 10.

[0047] Specifically, the temperature of the heating network 22 is fed back through the temperature detection result of the second temperature sensor 26, and the temperature controller determines whether to adjust the temperature of the heating network 22 based on the detection result of the second temperature sensor 26.

[0048] In some embodiments of this application, both the first connecting portion 23 and the second connecting portion 25 extend into the test chamber 10 along the top of the test chamber 10. The first temperature sensor 24 is located in the middle of the test chamber 10, and the heating mesh 22 is arranged in a ring and surrounds the first temperature sensor 24. In this way, the first connecting portion 23 and the second connecting portion 25 extend into the test chamber 10 through the top of the test chamber 10, increasing the integration of the opening positions on the cavity wall of the test chamber 10 and effectively improving the sealing performance of the test chamber 10. In addition, placing the first temperature sensor 24 in the middle of the test chamber 10 facilitates the measurement of the temperature of the dried curd in the middle of the test chamber 10. The heating mesh 22 is arranged around the first temperature sensor 24, so that the heating mesh 22 is symmetrically distributed along the centerline of the test chamber 10, so that the dried curd in the test chamber 10 can be uniformly heated by the heating mesh 22, reducing the problem of uneven heating effect of the dried curd.

[0049] In some embodiments of this application, the gas supply assembly includes an air pump 31 and an air guide pipe 32 for supplying gas; one end of the air guide pipe 32 extends into the test chamber 10, and the other end of the air guide pipe 32 is connected to the air pump 31. Thus, by setting the air pump 31 and the air guide pipe 32 together, with the air pump 31 located outside the test chamber 10 and the air guide pipe 32 extending into the test chamber 10, it is convenient to introduce oxygen into the test chamber 10, ensuring sufficient oxygen for the oxidation reaction during dry curing.

[0050] Specifically, the gas introduced into the gas inlet tube 32 can be air or oxygen.

[0051] In some embodiments of this application, one end of the gas guide tube 32 extending into the test chamber 10 is spirally arranged in the vertical direction, and the gas guide tube 32 surrounds the temperature controller. The portion of the gas guide tube 32 located inside the test chamber 10 has multiple air outlets along its length. Thus, by spirally encircling the gas guide tube 32 within the test chamber 10, and with multiple air outlets on the gas guide tube 32, the gas guide tube 32 has multiple air outlets within the test chamber 10, and these multiple air outlets are distributed along the length of the gas guide tube 32. This increases the number of locations for replenishing oxygen to the dry koji, facilitating uniform oxygen replenishment to the dry koji within the test chamber 10, thereby ensuring a thorough oxidation reaction in the dry koji.

[0052] In this embodiment, the first temperature sensors 24 are arranged at intervals in the vertical direction, the air guide tube 32 is spirally wound around the outer periphery of the heating net 22, the heating net 22 is annular and radially equidistantly surrounds the outer periphery of the first temperature sensors 24, the end of the second connecting part 25 extends radially along the heating net 22, and the second temperature sensor 26 is fixed to the end of the second connecting part 25 and abuts or is fixed to the heating net 22.

[0053] In some embodiments of this application, the test apparatus further includes a heat insulation layer 40, which is uniformly surrounding and attached to the outer wall of the test chamber 10. Thus, the heat insulation layer 40 reduces heat loss during use of the test chamber 10, providing a heat insulation effect.

[0054] This application has a test chamber 10 for accommodating dry curd, a controller body 21 and an air pump 31 located outside the test chamber 10, the controller body 21 is connected to a first connecting part 23 and a second connecting part 25, the air pump 31 is connected to an air guide pipe 32, the heating grid 22, the first temperature sensor 24 and the second temperature sensor 26 are all located inside the test chamber 10, the first connecting part 23 is used to connect the heating grid 22, and the second connecting part 25 is used to connect the first temperature sensor 24 and the second temperature sensor 26 simultaneously; the insulation layer 40 is located outside the test chamber 10.

[0055] During the experiment, dry koji (e.g., 80 kg) is placed into the test chamber 10; a target heating temperature for the dry koji is set; heating is initiated, and the temperature of the dry koji is measured using the first temperature sensor 24 and the temperature of the heating grid 22 is measured using the second temperature sensor 26, until the dry koji reaches the set temperature, at which point the heating grid 22 is turned off; the heating effect of the dry koji is observed, and whether or not the dry koji heats up is used to determine whether the dry koji reacts and heats up autonomously. During the experiment, oxygen can be simultaneously introduced into the test chamber 10 at the start of heating.

[0056] The existing technology also has the following problems:

[0057] 1) Traditional constant temperature test chambers use external wall heating, with the temperature probe located in the center. This means the heating element and the temperature probe are not at the same point. If the working fluid has poor thermal conductivity, the temperature response will be too slow, easily leading to overheating and exceeding the set value. This is unsuitable for materials with poor heat transfer, such as dry koji. To address this issue, this application uses a second temperature sensor 26 directly connected to the heating grid 22. This second temperature sensor 26 directly detects the temperature of the heating grid 22, thus avoiding the slow temperature response problem.

[0058] 2) Traditional constant temperature test chambers, which are essentially externally heated, primarily rely on radiation and convection heat transfer, lacking the conductive heat transfer method of this patent. Therefore, a separate experimental device needs to be installed inside the test chamber, significantly limiting the maximum experimental size, typically to around 40g. To address this issue, this application directly installs a heating grid 22 inside the test chamber, directly heating the dry material within the test chamber, effectively controlling the size of the test chamber.

[0059] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0060] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0061] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0064] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A mesoscale dry curing temperature control test device, characterized in that, The test apparatus includes: The test chamber (10) has a hollow interior and is used to contain the dry curing material; A temperature controller extends into the test chamber (10). The temperature controller heats the dry koji in direct contact with the dry koji through the part extending into the test chamber (10). The temperature controller is also used to monitor the temperature of the dry koji in real time. An air supply assembly extends into the test chamber (10) and is used to supply oxygen into the test chamber (10).

2. The mesoscale dry curing temperature control test apparatus according to claim 1, characterized in that, The temperature controller includes: The controller body (21) is located outside the test chamber (10); Heating mesh (22), the heating mesh (22) has a mesh-like extended structure, the heating mesh (22) is located inside the test chamber (10); The first connecting part (23) has the heating mesh (22) and the controller body (21) connected to its two ends respectively.

3. The mesoscale dry curing temperature control test apparatus according to claim 2, characterized in that, The heating mesh (22) is formed into a hollow ring structure or a hollow rectangular structure.

4. The mesoscale dry curing temperature control test apparatus according to claim 2, characterized in that, The temperature controller also includes: The first temperature sensor (24) is located inside the test chamber (10) and is used to detect the temperature of the dry curing inside the test chamber (10). The second connecting part (25) is on which the first temperature sensor (24) is fixed, and one end of the second connecting part (25) is connected to the controller body (21).

5. The mesoscale dry curing temperature control test apparatus according to claim 4, characterized in that, The first temperature sensor (24) has multiple sensors and each first temperature sensor (24) extends into the test chamber (10) at a different height. The multiple first temperature sensors (24) are used to measure the temperature at different heights of the dry bend.

6. The mesoscale dry curing temperature control test apparatus according to claim 4, characterized in that, The temperature controller also includes: The second temperature sensor (26) is fixed on the second connecting part (25). The second temperature sensor (26) abuts against or is fixed to the heating mesh (22). The second temperature sensor (26) is used to measure the temperature of the heating mesh (22).

7. The mesoscale dry curing temperature control test apparatus according to claim 4, characterized in that, The first connecting part (23) and the second connecting part (25) both extend into the test chamber (10) along the top of the test chamber (10). The first temperature sensor (24) is located in the middle of the test chamber (10). The heating mesh (22) is arranged in a ring and surrounds the first temperature sensor (24).

8. The mesoscale dry curing temperature control test apparatus according to claim 1, characterized in that, The gas supply assembly includes: An air pump (31) is used to supply gas; An air guide tube (32) is provided, one end of which extends into the test chamber (10), and the other end of which is connected to the air pump (31).

9. The mesoscale dry curing temperature control test apparatus according to claim 8, characterized in that, The end of the air guide tube (32) that extends into the test chamber (10) is spirally arranged in the vertical direction, and the air guide tube (32) surrounds the temperature controller. The portion of the air guide tube (32) located in the test chamber (10) has multiple air outlets along its length.

10. The mesoscale dry curing temperature control test apparatus according to any one of claims 1-9, characterized in that, The test apparatus also includes: The insulation layer (40) is uniformly surrounding and attached to the outer wall of the test chamber (10).

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