Sensory and quantitative co-thresholding test device

Abstract

This invention relates to a sensory and quantitative synergistic odor threshold testing device, comprising a sample placement chamber for holding a sample container and isolating it from the outside environment; an odor emission tube connected to the sample placement chamber; and several odor detection holes arranged at different positions from the sample placement chamber on the odor emission tube, each marked with an odor detection distance indicator. An odor detection head is provided for insertion into the odor detection hole, allowing odors to diffuse outwards through the odor detection head. This invention is used in quantitative analysis of odors (odor threshold method) to perform sensory and quantitative odor threshold testing, improving the judgment and quantitative evaluation scheme, and facilitating the implementation of the sensory judgment method required by national standards. Because the distance from each odor emission hole to the sample placement chamber is different, the odor can be smelled at different positions, allowing for the determination of its intensity. By comparing the odor threshold level markings at each odor emission hole, the odor threshold level can be determined more accurately.

Description

Technical Field

[0001] This utility model relates to an instrument for testing; specifically, it is applicable to a sensory quantitative odor threshold testing device and method for aquaculture wastewater and high-odor samples. Background Technology

[0002] Odor in water primarily originates from metabolites, pollutants in domestic sewage and industrial wastewater, the decomposition of natural substances, or related microbial activities. Especially in aquaculture wastewater, the odor directly impacts human perception. Odor detection is a sensory indicator perceived by the human olfactory system, belonging to physical monitoring, and is used to assess the degree of water pollution or the effectiveness of water treatment. Currently, there are three main methods for evaluating the odor of aquaculture wastewater.

[0003] Sensory evaluation: This involves olfactory assessors smelling and evaluating the odor of aquaculture wastewater. This method is typically suitable for scenarios with strong odors, is simple to operate, and can quickly detect the presence and intensity of the odor.

[0004] Dynamic odor identification method: This method uses dynamic dilution technology to dilute odor substances in wastewater to different concentrations, and then trained odor identifiers identify the odor thresholds and intensities.

[0005] The three-point comparative odor method: This method quantitatively evaluates odor concentration by comparing the intensity of a standard odor with that of the odor being tested. Odor assessors smell and evaluate the odor of the aquaculture wastewater. This method is typically suitable for scenarios with strong odors, is simple to operate, and can quickly detect the presence and intensity of odors. However, this method is not suitable for wastewater from aquaculture plants that has undergone advanced treatment to meet discharge standards. The national standard for drinking water, GB / T 5750.4-2023, can be referenced. This method classifies odor qualitative description and odor intensity approximate quantitative methods (odor threshold method) into six levels.

[0006] Level 0 (None) - No odor or taste whatsoever;

[0007] Level 1 (weak) - Very difficult to detect, but those sensitive to smells and odors can detect it;

[0008] Level 2 (weak) - barely perceptible;

[0009] Level 3 (obvious) - Clearly noticeable;

[0010] Level 4 (Strong) - There is already a very noticeable odor;

[0011] Level 5 (Very Strong) - Has a strong foul odor or strange smell.

[0012] However, the following technical problems exist when performing odor analysis:

[0013] 1. Direct sensory analysis, i.e., the method of direct smelling, can be extremely irritating to the personnel if the odor is very strong, causing discomfort and even harming their health. Therefore, it is necessary to design a scheme to appropriately suppress the intensity of odor stimulation in quantitative analysis of odor (olfactory threshold method) without affecting accurate judgment.

[0014] 2. Relying entirely on personal sensory judgment is limited by individual sensory differences and lacks auxiliary measuring devices, so the judgment may be inaccurate.

[0015] Therefore, it is necessary to design a scheme to assist sensory judgment and improve the accuracy of judgment in quantitative analysis of odor (olfactory threshold method).

[0016] Of course, there are also solutions that aim to replace human sensory detection with computer-based methods. For example, patent CN102192970A discloses an odor measurement method and system. Its disclosed technical solution involves the following steps: using the output value of a reference sensor and the detection value of an individual environmental odor; introducing a reference substance into an odor measurement device including multiple odor sensors and measuring the output value of each odor sensor; calculating a reference value by determining the ratio of the output value of the reference sensor to the reference substance to the output value of each individual odor sensor; and calculating the odor intensity of the individual environmental odor using the output value of the odor sensors, the ratio calculated in the reference value calculation step, and the aforementioned detection formula. This makes it easy to modify the detection value of the environmental measurement device and the reference value to be information most consistent with the odor components present at the scene.

[0017] For example, patent CN114331061A provides a method for evaluating the odor of urban and rural black and odorous water bodies. The disclosed technical solution is to obtain conventional water quality testing parameters related to black and odorous water bodies; then establish correlation analysis to identify water quality testing parameters related to odor threshold; extract the main control parameters through factor analysis, and obtain factors as the analysis objects of the fuzzy comprehensive evaluation model by combining the correlation analysis results; then optimize the fuzzy comprehensive evaluation model to establish an improved fuzzy comprehensive evaluation model to judge the black and odorous water body situation and obtain the fuzzy comprehensive evaluation result.

[0018] However, the two schemes mentioned above still cannot replace the sensory judgment method required by the national standard.

[0019] Therefore, they still need a method to assist sensory judgment and improve the accuracy of judgment in quantitative analysis of odor (olfactory threshold method). Utility Model Content

[0020] To address the aforementioned technical problems, this invention provides a sensory and quantitative synergistic olfactory threshold testing device.

[0021] The device of this utility model includes a sample placement chamber for placing a sample container and isolating it from the outside world;

[0022] It has an odor venting tube that connects the sample placement chamber to the outside environment;

[0023] Several odor detection holes are set at different positions of the odor emission tube from the sample placement chamber.

[0024] As described above, in the sensory and quantitative synergistic olfactory threshold testing device, the odor emission tube is connected to the top of the sample placement chamber.

[0025] As described above, the sensory and quantitative synergistic olfactory threshold testing device has an openable and closable door on the side of the sample placement chamber.

[0026] As described above, in the sensory and quantitative synergistic olfactory threshold testing device, the sample placement chamber consists of a chamber body and a top cover that is detachably connected to the chamber body; the odor emission tube is located in the middle of the top cover.

[0027] As described above, in the sensory and quantitative synergistic olfactory threshold testing device, the odor emission tube is composed of several interconnected tube segments; the tail end of the last tube segment of the odor emission tube is a closed structure.

[0028] As described above, the sensory and quantitative synergistic olfactory threshold testing device is composed of several interconnected tube segments, specifically:

[0029] It consists of several coaxial pipe sections of the same diameter that are detachably connected to each other, with 1-5 odor detection holes on each pipe section.

[0030] As described above, the sensory and quantitative synergistic olfactory threshold testing device is composed of several interconnected tube segments, specifically one of the following:

[0031] It consists of several coaxial pipe segments of different diameters that are nested together, with 1-5 odor detection holes on each pipe segment;

[0032] It consists of an extended section and a telescopic section that are detachably connected; the extended section is composed of several pipe segments that are detachably connected to each other, and each pipe segment is provided with 1-5 odor detection holes; the telescopic section is connected to the end of the last pipe segment; the telescopic section is composed of several coaxial pipe segments of different diameters that are nested together, and each pipe segment is provided with 1-5 odor detection holes.

[0033] As described above, in the sensory and quantitative synergistic olfactory threshold testing device, each olfactory olfactory detection hole is marked with an olfactory distance indicator.

[0034] As described above, in the sensory and quantitative synergistic olfactory threshold testing device, a sealing gasket is provided at the olfactory and odor discrimination hole to open and close the olfactory and odor discrimination hole.

[0035] It is equipped with a olfaction head. After the olfaction head is inserted into the olfaction hole, the odor can diffuse outward through the olfaction head. The olfaction head is funnel-shaped, with a tube at the lower end for insertion into the olfaction hole. The end of the tube is slanted. The upper end is a funnel-shaped opening for the odor to diffuse outward. The tube and the funnel-shaped opening are connected.

[0036] As described above, in the sensory and quantitative synergistic olfactory threshold testing device, the odor emission tube can be detachably stored in the sample placement chamber.

[0037] It is also equipped with a storage rack for odor emission tubes, which can be detached and stored in the sample placement chamber; the storage rack is adapted to the inner cavity of the sample placement chamber, and several holes are provided on the top of the storage rack, with the outer diameter of the odor emission tubes matching the gap between the holes.

[0038] Beneficial technical effects:

[0039] This invention relates to a scheme for combining sensory and quantitative methods in quantitative analysis of odor (olfactory threshold method), which improves judgment and quantitative evaluation, and helps to implement the sensory judgment method required by national standards.

[0040] This invention provides a preliminary olfactory assessment (0-5 level) of a sample. The sample is placed in a sample placement chamber, the chamber is closed, and an odor diffusion tube is connected. After a certain time and distance of diffusion, the odor is evenly dispersed in the odor diffusion tube, and the odor intensity gradually decreases to an acceptable level for the tester. An odor detection head is then inserted for olfactory assessment, and the distance (in cm) between the odor diffusion tube's odor detection hole and the sample is measured. Combined with the 0-5 level sensory description, a quantitative olfactory value (X.XXX) is obtained, represented by a 4-digit number (where the first digit represents the preliminary sensory assessment (0-5 level), the second digit represents the olfactory intensity (increasing by one level for each additional tube), and the second to fourth digits represent the measured olfactory distance, in cm). This combined sensory and quantitative olfactory threshold testing ensures both accuracy and the health of the testers.

[0041] Since the distance from each odor vent to the sample placement chamber is different, the odor can be smelled by the senses at different locations, and its intensity can be determined. By comparing with the odor threshold level markings on each odor vent, the odor threshold level can be determined more accurately.

[0042] This utility model has a reasonable and simple structure, low cost, and is easy to test. Attached Figure Description

[0043] Figure 1 This is a schematic diagram illustrating the working principle of this utility model;

[0044] Figure 2 This is a structural diagram of the utility model;

[0045] Figure 3 This is a schematic diagram showing the positional relationship of the various components of this utility model;

[0046] Figure 4 This is a schematic diagram of the storage rack of this utility model;

[0047] Figure 5 This is a structural diagram of the olfactory detection head of this utility model.

[0048] 1. Chamber body; 2. Top cover; 3. Odor emission tube; 4. Odor detection head; 5. Odor detection hole; 6. Storage rack; 7. Pipe section; 8. Sealing gasket; 9. Sample testing pool; 10. Sample placement chamber. Detailed Implementation

[0049] The following is a reference appendix Figure 1-5 An example is provided.

[0050] Example 1:

[0051] The sample placement chamber 10 is cylindrical, with an inner cavity height of 25-30cm and an inner diameter of 15-20cm, and is used to place the sample testing pool 9.

[0052] The sample placement chamber 10 is made of one or a combination of glass, acrylic, plastic, and stainless steel to facilitate observation of the sample after it is placed inside.

[0053] The sample placement chamber 10 is a sealing device with a door or lid opening function.

[0054] Example 2:

[0055] The sample placement chamber 10 has a door on its side, allowing the sample to be placed into it through the door. The door opening should be large enough to accommodate the sample. When the door is closed, the sample placement chamber 10 is isolated from the outside, creating a sealed environment. One side of the door should be hinged to the opening of the sample placement chamber 10. The door should be an arc-shaped panel with the same radius as the cylindrical sample placement chamber 10, forming part of the wall of the sample placement chamber 10 when closed. The door can be made of transparent glass or acrylic material to replace the observation window.

[0056] The odor emission tube 3 is connected to the center of the top of the sample placement chamber 10.

[0057] Example 3:

[0058] The sample placement chamber 10 consists of a chamber body 1 and a top cover 2. The top cover 2 is located above the chamber body 1 and is detachably connected to it. After the chamber body 1 and the top cover 2 are connected, the inner cavity height is 30-35cm and the inner diameter is 15-20cm. The connection between the chamber body 1 and the top cover 2 is either a threaded connection or a snap-fit ​​connection. If a threaded connection is used, the chamber body 1 has an external thread and the top cover 2 has a matching internal thread.

[0059] The sample placement chamber 10 contains the matching sample testing pool 9.

[0060] The odor emission tube 3 is located in the middle of the top cover 2.

[0061] The top cover 2 is made of plastic or metal, preferably metal, to facilitate the installation of the odor emission tube 3. Of course, it can also be made of transparent glass or acrylic, but the process is more complex and the cost is higher. When the top cover 2 is made of plastic or metal, the chamber body 1 is preferably made of transparent glass or acrylic to allow for visual observation of the interior.

[0062] Example 4:

[0063] The odor emission tube 3 is detachably connected to the sample placement chamber 10.

[0064] The top of the sample placement chamber 10 has an L-shaped bend. One section of the L-shaped bend is coaxial with the sample placement chamber 10, and the other section bends 90 degrees so that its axis is perpendicular to the sample placement chamber 10. The L-shaped bend is a connector used to connect to the odor emission tube 3 by means of a sleeve or a threaded connection.

[0065] The sample placement chamber 10 has an opening at the top, or the top cover 2 of the sample placement chamber 10 has an opening at the center. The L-shaped bend can be fixed to the opening at the top of the sample placement chamber 10 and connected by bonding or welding.

[0066] Another example is that the top of the sample placement chamber 10 has an opening, or the center of the top cover 2 of the sample placement chamber 10 has an opening with a diameter of 22mm. A 6-point pipe double male thread direct conversion adapter is installed in the opening. One end of the double male thread direct conversion adapter has a thread length of 5mm (inside the chamber), and the other end has a thread length of 10mm (outside the chamber). The parts inside and outside the chamber are respectively fitted with an M24 thin nut (hexagonal root nut, height 3mm). The 6-point pipe double male thread direct conversion adapter is clamped at the opening. At this time, the conversion adapter is coaxial and connected with the sample placement chamber 10, and a part of the pipe with external threads extends from the top of the sample placement chamber 10. Then, a 6-point pipe 90-degree bend with internal threads is added to this extended part, thus finally forming an L-shaped bend fixed to the top of the sample placement chamber 10 with internal threads.

[0067] Example 5:

[0068] The purpose of the odor emission tube 3 is to disperse the odor of the water sample in the sample placement chamber 10. Because several odor emission holes are set at different positions on the odor emission tube 3 at different distances from the sample placement chamber 10, the concentration of the odor of the water sample emitted from the odor emission holes at different positions is different.

[0069] The odor emission tube 3 is made of plastic tube, plastic steel tube, aluminum tube, or stainless steel tube, etc.

[0070] Each odor emission tube 3 is 30-50cm long. On the odor emission tube 3 connected to the L-shaped bend, there are odor identification holes 5 at distances of 0, 5, 15, 30, and 50cm from the sample placement chamber. On the remaining odor emission tubes 3 used for extension, there are odor identification holes 5 at equal intervals of 20cm. The last hole is near the end of the odor emission tube 3. A plug is installed at the end of the last tube segment 7.

[0071] The inner diameter of the odor diffuser 3 is 10mm-30mm.

[0072] Example 6:

[0073] A preferred example of an odor evaporation tube 3 is that it is composed of several interconnected tube segments 7.

[0074] Specifically, several odor venting tubes 3 are installed, and these odor venting tubes 3 can be connected end to end. The front end of the first tube section is set to be an external thread that mates with the inner diameter of a 6-point pipe, and the rear end of the first tube section is also set to be the inner diameter of a 6-point pipe; the structure of the remaining tube sections is the same as that of the first tube section.

[0075] Each tube segment shall not exceed 18cm in length (to facilitate its inclusion into the inner cavity of the sample placement chamber 10 as in Example 9).

[0076] Connect the front end of the first pipe section to the internal threaded elbow of the 90-degree bend in the 6-point pipe. Screw the first pipe section onto the elbow during operation and remove it when not in use. Connect the remaining pipe sections in sequence. Install a plug at the end of one of the pipe sections.

[0077] At least one vent is provided on each pipe section, with the last vent located at the end of the fourth pipe section. The odor vents are evenly distributed on the odor vent pipe 3.

[0078] Each odor emission point is marked with an odor threshold level indicator.

[0079] Example 7:

[0080] Another example of an odor evacuation tube 3 is that it is composed of several interconnected tube segments.

[0081] The odor evacuation tube 3 is composed of several coaxial tube segments of different diameters that are interlocked. For example, four coaxial tube segments of different diameters can be interlocked. The tube segment with the largest diameter is the first tube segment (outer diameter 19.5mm). The outer diameter of the second tube segment is smaller than the inner diameter of the first tube segment and it is inserted into the first tube segment. The outer diameter of the third tube segment is smaller than the inner diameter of the second tube segment and it is inserted into the second tube segment. The outer diameter of the fourth tube segment is smaller than the inner diameter of the third tube segment and it is inserted into the third tube segment. A plug (block) is installed at the very end of the fourth tube segment, which not only blocks the end of the fourth tube segment, but the diameter of the plug is also larger than the diameter of the first tube segment. Therefore, the four tube segments can be contracted (for easy storage when not in use) or stretched (for easy extension when in use).

[0082] The total length formed after the four tube segments are contracted shall not exceed 18cm (to facilitate inclusion into the inner cavity of the sample placement chamber 10 as in Example 9).

[0083] The first pipe section has an outer diameter of 19.5mm and connects to the internal threaded elbow of a 6-point pipe at a 90-degree bend. During operation, the first pipe section is screwed onto the elbow; it is removed when not in use. The fourth pipe section has an outer diameter of 12mm.

[0084] Each pipe section has 1-5 vent holes, with the last hole located at the end of the fourth pipe section. When the four pipe sections are stretched, the odor vent holes also spread out accordingly and are evenly distributed on the odor vent pipe 3.

[0085] Each odor emission point is marked with an odor threshold level indicator.

[0086] In this example, since the diameters of the odor emission tubes 3 are different, the calculation of the evaluation value may be inaccurate or more complicated, so it is not preferred.

[0087] Example 8:

[0088] The odor emission tube 3 is composed of several interconnected tube sections.

[0089] The first few sections are structurally identical to the first pipe section in Example 6 (which can be considered as extended sections); the last few sections are structurally identical to the first to fourth pipe sections in Example 7 (which can be considered as expansion sections).

[0090] In use, first install the first pipe segment from Example 6, and then connect the first pipe segment from Example 7 to the end of the first pipe segment from Example 6. This allows the odor venting tube 3 to be extended further, and also allows for more odor venting holes while maintaining the same spacing.

[0091] Each odor emission point is marked with an odor threshold level indicator.

[0092] In this example, since the diameters of the odor emission tubes 3 are different, the calculation of the evaluation value may be inaccurate or more complicated, so it is not preferred.

[0093] Example 9:

[0094] A sealing gasket 8 is provided at the odor detection hole 5 to open and close the odor detection hole 5.

[0095] In one embodiment, the sealing gasket 8 is a ring-shaped rubber strip, coaxial with the odor venting tube 3, and fitted over the odor detection hole 5 on the odor venting tube 3, blocking the odor detection hole 5. To insert the odor detection head 4, the ring-shaped rubber strip is removed to expose the odor detection hole 5. Another example is that the ring-shaped rubber strip is fitted over the odor detection hole 5 on the odor venting tube 3, blocking the odor detection hole 5. A narrow slit is cut into the ring-shaped rubber strip at the location corresponding to the odor detection hole 5; this slit remains closed under rubber tension under normal conditions, but opens when the odor detection head 4 is inserted.

[0096] Of course, you can also use other materials instead of rubber, such as plastics with less elasticity.

[0097] Another example is that the annular rubber band blocks the olfactory detection hole 5, and a narrow opening is made on the annular rubber band corresponding to the olfactory detection hole 5. Normally, the narrow opening is sealed under the tension of the rubber; however, the olfactory head 4 can be directly inserted into the olfactory detection hole 5 from the narrow opening.

[0098] An odor detection head 4 is provided. After the odor detection head 4 is inserted into the odor detection hole 5, the odor can diffuse outward through the odor detection head 4. The odor detection head 4 is funnel-shaped, with a tube at the lower end for insertion into the odor detection hole 5. The end of the tube is beveled, facing the sample placement chamber 10. The outer diameter of the tube is adapted to the odor diffusion hole. In one example, the diameter of the odor diffusion hole is 15mm, and the outer diameter of the tube is 15mm, with a clearance fit between the two within the manufacturing dimensional tolerances. The length of the tube is equal to or greater than the diameter of the odor diffusion tube 3.

[0099] The upper part of the olfaction head 4 is a funnel-shaped opening that allows the odor to diffuse outwards; the tube body and the funnel opening are connected. The diameter of the funnel opening is 25mm-30mm. The overall shape of the olfaction head 4 resembles a Buchner funnel.

[0100] Example 10:

[0101] The storage rack 6, which is equipped with the odor emission tube 3, is detachably installed in the sample placement chamber 10. When the testing device is to be used, the storage rack 6 is taken out from the sample placement chamber 10. When the testing device is not used, the storage rack 6 is placed in the sample placement chamber 10 to store the odor emission tube 3.

[0102] The storage rack 6 is made of corrugated cardboard or foam material (in short, a lightweight material). When the inner cavity of the sample placement chamber 10 is a circular cavity, the storage rack 6 is a cylinder with an outer diameter appropriately smaller than the inner diameter of the sample placement chamber 10. Several holes are opened on the storage rack 6, the diameter of which is approximately equal to the outer diameter of the odor emanating tube 3. If there are multiple odor emanating tubes 3 with different outer diameters, holes of different diameters are opened. This allows each odor emanating tube 3 (whether it's the odor emanating tube 3 in Example 6 or the odor emanating tube 3 in Example 7) to be placed inside the holes, completing the storage.

[0103] The storage rack 6 is adapted to the inner cavity of the sample placement chamber 10, the tube section 7 is placed into the hole, and then the top cover 2 is put on to complete the storage.

[0104] Example 11:

[0105] 1. Equipment connection and stationary position:

[0106] Securely connect the corresponding interface of the odor evaporation tube 3 to ensure a smooth gas passage.

[0107] 2. Installation of olfactory detection accessories:

[0108] Take the olfactory identification test accessory (the structural diagram should include: olfactory head 4, connecting tube, soft gasket seal, etc.) and insert it into the olfactory identification hole 5.

[0109] Check the connection between the accessory and the odor detection hole 5 to ensure that the interface is completely sealed to prevent odor leakage.

[0110] 3. Sample preparation and placement:

[0111] Pour the water sample to be tested into the measuring pool, ensuring that the sample volume meets the testing requirements, and conduct a preliminary sensory evaluation of 0-5 to obtain a value of 0-5.

[0112] Place the sample placement chamber 10 into the measuring cell and close the top cover 2 or the chamber door to ensure airtightness. Connect the odor emission tube 3 and determine whether it is necessary to add more odor emission tubes 3 based on the preliminary sensory evaluation.

[0113] In this step, the odor intensity of the water sample can be predicted first. If the predicted odor intensity is weak, only a small number of odor emission tubes 3 can be connected. However, if the predicted odor intensity is strong, all odor emission tubes 3 can be connected, making the odor emission tubes 3 longer. This reduces the odor intensity at the end of the odor emission tubes 3, avoiding strong stimulation and discomfort to the measurement personnel during the assessment, and ensuring their health.

[0114] 4. Smell detection operation and distance adjustment:

[0115] Let it stand for 3-5 minutes to allow the odor emitted by the water sample to diffuse stably within the testing device.

[0116] The olfactory tester uses the olfactory testing accessory to conduct a second olfactory identification on the olfactory emission tube 3 from far to near, and judges the olfactory level (0-3: level 0 is no olfactory, level 1 is slight olfactory, level 2 is obvious olfactory, and level 3 is strong olfactory). If the olfactory sensory level is 0, the olfactory distance can be adjusted forward until the olfactory sensation remains unchanged.

[0117] Record the distance from the current olfactory point to the water sample (unit: cm).

[0118] Repeat the olfactory identification and record the results.

[0119] Note: If multiple water samples are to be tested consecutively, the sample placement chamber 10, the olfaction head 4, and the odor emission tube 3 must be cleaned with air washing.

[0120] 5. Recording and Presenting Results:

[0121] After smelling, record the smelling results using a 4-digit number:

[0122] First: After receiving the sample, the olfactory examiner pours the sample into the sample pool for preliminary olfactory grading (0-5 levels);

[0123] 2nd-4th digits: olfactory detection distance (in centimeters; if less than 3 digits, add 0s to fill the remaining digits, such as 5cm is recorded as 005).

[0124] Example: If the odor level is 2 and the distance is 35cm, it is recorded as "2.035".

[0125] The larger the number, the stronger the odor.

[0126] The above is an exemplary description of this utility model, which lists multiple examples, each with a different emphasis in the description of this technology. Furthermore, some examples can be combined to form new examples; however, it is important to note that such combinations must adhere to the core ideas of this patented technology. If such combinations violate the core ideas of this patent, they should be avoided.

Claims

1. A sensory and quantitative synergistic olfactory threshold testing device, characterized in that, Includes a sample placement compartment for placing sample containers and isolating them from the outside environment; It has an odor venting tube that connects the sample placement chamber to the outside environment; Several odor detection holes are set at different positions of the odor emission tube from the sample placement chamber.

2. The sensory and quantitative synergistic olfactory threshold testing device as described in claim 1, characterized in that, The odor escaping tube is connected to the top of the sample placement chamber.

3. The sensory and quantitative synergistic olfactory threshold testing device as described in claim 1, characterized in that, The sample placement chamber has an openable and closable door on its side.

4. The sensory and quantitative co-thresholding test device of claim 1, wherein, The sample placement chamber consists of a chamber body and a top cover that is detachably connected to the chamber body; the odor emission tube is located in the middle of the top cover.

5. The sensory and quantitative co-thresholding test device of claim 1, wherein, The odor emission tube is composed of several interconnected tube segments; the end of the last tube segment of the odor emission tube is a closed structure.

6. The sensory and quantitative co-thresholding test device of claim 5, wherein, The structure consists of several interconnected pipe sections, specifically: It consists of several coaxial pipe sections of the same diameter that are detachably connected to each other, with 1-5 odor detection holes on each pipe section.

7. The sensory and quantitative co-thresholding test device of claim 5, wherein, The structure consists of several interconnected pipe sections, specifically one of the following: It consists of several coaxial pipe segments of different diameters that are nested together, with 1-5 odor detection holes on each pipe segment; It consists of an extended section and a telescopic section that are detachably connected; the extended section is composed of several pipe segments that are detachably connected to each other, and each pipe segment is provided with 1-5 odor detection holes; the telescopic section is connected to the end of the last pipe segment; the telescopic section is composed of several coaxial pipe segments of different diameters that are nested together, and each pipe segment is provided with 1-5 odor detection holes.

8. The sensory and quantitative synergistic olfactory threshold testing device as described in claim 1, characterized in that, Each olfaction aperture is marked with an olfaction distance indicator.

9. The sensory and quantitative synergistic olfactory threshold testing device as described in claim 1, characterized in that, The odor detection hole is equipped with a sealing gasket for opening and closing the odor detection hole; It is equipped with a olfaction head. After the olfaction head is inserted into the olfaction hole, the odor can diffuse outward through the olfaction head. The olfaction head is funnel-shaped, with a tube at the lower end for insertion into the olfaction hole. The end of the tube is slanted. The upper end is a funnel-shaped opening for the odor to diffuse outward. The tube and the funnel-shaped opening are connected.

10. The sensory and quantitative synergistic olfactory threshold testing device as described in claim 1, characterized in that, The odor emission tube can be detached and stored in the sample placement chamber; It is also equipped with a storage rack for odor emission tubes, which can be detached and stored in the sample placement chamber; the storage rack is adapted to the inner cavity of the sample placement chamber, and several holes are provided on the top of the storage rack, with the outer diameter of the odor emission tubes matching the gap between the holes.

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