A correction method for measuring temperature of tobacco flow in a cut tobacco chamber

Abstract

The application provides a correction method for measuring the temperature of flowing tobacco in a tobacco drying chamber, which comprises the following steps: step S1, measuring the surface temperature of flowing tobacco in a tobacco drying chamber by using an infrared temperature measuring device to obtain initial temperature data of the measured tobacco; step S2, determining the emissivity of the measured tobacco, and correcting the initial temperature data according to the emissivity; step S3, calculating the ratio of the measurement distance to the tobacco thickness as a distance coefficient, and correcting the temperature data obtained in the previous step according to the distance coefficient; step S4, correcting the temperature data obtained in the previous step according to the reflectivity of the tobacco surface; step S5, applying an ambient temperature compensation algorithm to correct the temperature data obtained in the previous step; and step S6, outputting the corrected tobacco temperature data. The application can obtain more accurate tobacco temperature and better meet the temperature measurement requirements of flowing tobacco in a complex environment.

Description

Technical Field

[0001] This invention belongs to the field of tobacco manufacturing technology, and specifically relates to a correction method for measuring the temperature of flowing tobacco shreds inside a drying chamber. Background Technology

[0002] In tobacco processing, the drying process is one of the most crucial steps. Its main purpose is to ensure the quality and flavor of the tobacco by uniformly heating and drying the tobacco shreds. During this process, temperature control of the tobacco shreds directly impacts the final product quality. However, due to the continuous flow of the tobacco shreds within the drying chamber and the uneven temperature distribution within the chamber, accurate real-time measurement and control of the tobacco temperature presents a significant challenge.

[0003] Currently, common methods for measuring tobacco temperature include contact and non-contact methods. Contact temperature measurement typically uses sensors such as thermocouples, but because the tobacco flows at high speed within the drying chamber, contact sensors are prone to wear or damage and cannot accurately capture dynamic temperature changes in real time. Therefore, non-contact infrared thermometry has gradually become the primary temperature measurement method in the tobacco drying process.

[0004] Infrared thermometry indirectly calculates temperature by detecting the intensity of infrared radiation on the surface of an object. It offers advantages such as speed and non-contact operation, making it suitable for objects moving at high speeds. However, when applied to tobacco flowing within a drying chamber, infrared thermometry still faces the following technical challenges: Emissivity uncertainty: The surface emissivity of tobacco is affected by factors such as its material, color, and surface roughness; changes in emissivity can lead to inaccurate infrared thermometry results. Impact of measurement distance on temperature measurement: Infrared radiation energy decreases with increasing measurement distance; without correction, changes in measurement distance can cause errors in temperature measurement results. Environmental radiation interference: The high-temperature environment and other heat sources within the drying chamber may generate environmental radiation or reflection interference, affecting the accuracy of temperature measurement results. Impact of dynamic flow: Because the tobacco flows within the drying chamber and the temperature field is uneven, the temperature measuring device only measures the surface temperature of the tobacco and cannot reflect overall temperature changes; furthermore, fluctuations in ambient temperature can further affect the measurement results. Existing tobacco temperature measurement methods often consider static or single factors and cannot comprehensively reflect complex process conditions, resulting in relatively inaccurate tobacco temperature measurements. Therefore, how to design a correction method for measuring the temperature of flowing tobacco in the drying chamber so that the obtained tobacco temperature is more accurate and can better meet the temperature measurement needs of flowing tobacco in complex environments has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a correction method for measuring the temperature of flowing tobacco shreds inside a drying chamber, so as to solve the above-mentioned technical problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A correction method for measuring the temperature of flowing tobacco shreds within a drying chamber, comprising the following steps:

[0008] Step S1: Measure the surface temperature of the tobacco flowing inside the drying chamber using an infrared thermometer to obtain the initial temperature data of the tobacco being tested.

[0009] Step S2: Determine the emissivity of the tobacco being tested, and correct the initial temperature data based on the emissivity;

[0010] Step S3: Calculate the ratio of the measurement distance to the tobacco thickness as the distance coefficient, and correct the temperature data obtained in the previous step based on the distance coefficient;

[0011] Step S4: Correct the temperature data obtained in the previous step based on the reflectivity of the tobacco surface;

[0012] Step S5: Apply the ambient temperature compensation algorithm to correct the temperature data obtained in the previous step;

[0013] Step S6: Output the corrected tobacco temperature data.

[0014] Preferably, the specific details of correcting the initial temperature data based on emissivity are as follows:

[0015] Based on the material, surface texture, and color characteristics of the tobacco, select or calibrate an appropriate emissivity value, and correct the initial temperature data using the following formula:

[0016] ;

[0017] Wherein: T measured The corrected temperature is denoted as ν; E is the measured infrared radiation energy; τ is the transmittance of the air medium. σ is the emissivity of the object being measured; σ is the Stefan-Boltzmann constant.

[0018] Preferably, the specific steps for correcting the temperature data obtained in the previous step based on the distance coefficient are as follows:

[0019] Use the following formula to correct the temperature data obtained in the previous step:

[0020] ;

[0021] Wherein: T correctedThe temperature is after distance correction; α is a correction coefficient related to the attenuation rate of infrared radiation energy; K0 is the ratio of the measurement distance to the tobacco thickness under calibration conditions; K is the value of the tobacco temperature when measuring at the standard distance.

[0022] Preferably, the formula for calculating the distance coefficient K is:

[0023] ;

[0024] Where, d measure d is the distance between the infrared thermometer and the tobacco being measured. smoke The thickness of the tobacco shreds.

[0025] Preferably, the specific method for obtaining the correction coefficient α is as follows:

[0026] At different distances d measured Below, the surface temperature T of the tested tobacco shreds is measured. measured Compare the reference temperature at the standard distance and analyze the temperature decay trend at different distances; fit the value of α based on these experimental data.

[0027] Preferably, the specific details of correcting the initial temperature data based on the reflectivity of the tobacco surface are as follows:

[0028] Use the following formula for correction:

[0029] ;

[0030] Wherein: T final The corrected temperature; T b The temperature before correction.

[0031] Preferably, the specific steps for applying the ambient temperature compensation algorithm to correct the temperature data obtained in the previous step are as follows:

[0032] Collect ambient temperature data inside the wire drying chamber, and calculate the difference between the ambient temperature and the temperature data obtained in the previous step; use the following formula for correction:

[0033] ;

[0034] Wherein: T compensated This is the temperature after ambient temperature correction; T env The ambient temperature; T smoke The initial temperature data of the tobacco shreds obtained by measurement; k is the compensation coefficient.

[0035] Preferably, the compensation coefficient is obtained through multiple experiments and calibration using historical data.

[0036] Preferably, it further includes a multi-point temperature measurement method, the multi-point temperature measurement method comprising:

[0037] Multiple infrared temperature measuring devices are arranged inside the tobacco drying chamber to obtain temperature data of tobacco shreds at different locations;

[0038] Based on temperature data of tobacco shreds at different locations, a three-dimensional temperature field within the drying chamber is reconstructed to assess the heat flow distribution of the tobacco shreds.

[0039] Preferably, the reconstruction of the three-dimensional temperature field is modeled using finite element analysis or computational fluid dynamics techniques.

[0040] The beneficial effects of this invention are as follows:

[0041] The present invention provides a correction method for measuring the temperature of flowing tobacco shreds within a drying chamber. This method comprehensively considers the influence of emissivity, measurement distance, reflectivity, and ambient temperature on the measured tobacco temperature, dynamically adjusting the measured temperature to ensure greater accuracy and better meet the temperature measurement requirements of flowing tobacco shreds in complex environments. Furthermore, this invention not only improves the accuracy of tobacco temperature measurement but also provides reliable technical support for optimizing the drying process and enhancing product quality. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly described below, and the specific embodiments of the present invention will be further described in detail with reference to the drawings, wherein...

[0043] Figure 1 A flowchart of a correction method for measuring the temperature of flowing tobacco shreds inside a drying chamber, provided in an embodiment of the present invention. Detailed Implementation

[0044] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0045] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0046] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0047] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0048] like Figure 1 As shown, this embodiment of the invention provides a correction method for measuring the temperature of flowing tobacco shreds within a drying chamber, which includes the following steps:

[0049] Step S1: Measure the surface temperature of the tobacco flowing inside the drying chamber using an infrared thermometer to obtain the initial temperature data of the tobacco being tested.

[0050] Step S2: Determine the emissivity of the tobacco being tested, and correct the initial temperature data based on the emissivity;

[0051] Step S3: Calculate the ratio of measurement distance to tobacco thickness as a distance coefficient, and correct the temperature data obtained in step S2 based on the distance coefficient;

[0052] Step S4: Correct the temperature data obtained in step S3 based on the reflectivity of the tobacco surface to reduce the influence of environmental radiation and other reflection interference.

[0053] Step S5: Apply the ambient temperature compensation algorithm to correct the temperature data obtained in step S4, so as to correct the influence of nearby high-temperature objects and changes in ambient temperature on the measurement results.

[0054] Step S6: Output the corrected tobacco temperature data, which is the temperature data obtained in step S5.

[0055] In infrared thermometry, the emissivity of an object's surface is one of the key factors affecting measurement accuracy. The emissivity of tobacco varies depending on the material, color, and surface texture. To accurately obtain the temperature of tobacco, calibration based on its characteristics is first necessary.

[0056] Furthermore, the specific details of correcting the initial temperature data based on emissivity are as follows:

[0057] Based on the material, surface texture, and color characteristics of the tobacco, select or calibrate an appropriate emissivity value, and use the following formula to correct the initial temperature data:

[0058] ;

[0059] Wherein: T measured The temperature is after emissivity correction; E is the measured infrared radiation energy, which is also the initial temperature data; τ is the transmittance of the air medium. Let be the emissivity of the object being measured; σ be the Stefan-Boltzmann constant. Emissivity can be calibrated experimentally or obtained from a known database.

[0060] The distance between the infrared temperature measuring device and the object being measured affects the measurement results, as the infrared radiation energy on the object decreases with increasing distance. To reduce the impact of this attenuation on temperature measurement, this invention introduces a distance coefficient K for correction.

[0061] Furthermore, the specific details of correcting the temperature data obtained in step S2 based on the distance coefficient are as follows:

[0062] The temperature data obtained in step S2 should be corrected using the following formula:

[0063] ;

[0064] Wherein: T corrected The temperature is after distance correction; α is a correction coefficient related to the attenuation rate of infrared radiation energy; K0 is the ratio of the measurement distance to the tobacco thickness under calibration conditions; K is the value of the tobacco temperature when measuring at the standard distance.

[0065] Specifically, the formula for calculating the distance coefficient K is:

[0066] ;

[0067] Where, d measure d is the distance between the infrared thermometer and the tobacco being measured. smoke The thickness of the tobacco shreds.

[0068] Specifically, the method for obtaining the correction coefficient α is as follows:

[0069] At different distances d measured The surface temperature T of the tested tobacco shreds was obtained. measured Compare the reference temperature at the standard distance and analyze the temperature decay trend at different distances; fit the value of α based on these experimental data.

[0070] Since the reflectivity of the tobacco surface can cause measurement errors due to brightness or mirror effect, in order to reduce the impact of reflection interference on the temperature measurement results, this invention corrects the measurement errors caused by brightness or mirror effect by adjusting the reflectivity compensation setting of the infrared temperature measurement device, and uses the corresponding formula to correct the error caused by reflection.

[0071] Furthermore, the specific details of correcting the temperature data obtained in step S3 based on the reflectivity of the tobacco surface are as follows:

[0072] Adjust the reflectivity compensation setting of the infrared temperature measuring device according to the reflectivity characteristics of the tobacco surface;

[0073] The temperature data obtained in step S3 should be corrected using the following formula:

[0074] ;

[0075] Wherein: T final Temperature after reflectivity correction; T b The background temperature is the temperature before correction, which is also the temperature data obtained in step S3.

[0076] To further improve the accuracy of the measurement, this invention also considers the influence of ambient temperature and corrects the measured temperature of the tobacco shreds through an ambient temperature compensation algorithm.

[0077] Furthermore, the specific steps for correcting the temperature data obtained in step 4 using the ambient temperature compensation algorithm are as follows:

[0078] The ambient temperature data inside the tobacco drying chamber is collected in real time by sensors, and the difference between the ambient temperature and the initial temperature of the tobacco is calculated; then, the following formula is used for correction:

[0079] ;

[0080] Wherein: T compensated This is the temperature after ambient temperature correction; T env The ambient temperature; T smoke The initial temperature data of the tobacco shreds obtained from the measurement; k is the compensation coefficient. It can be understood that the final output T... compensated The value is used as the measurement temperature of the tobacco.

[0081] Specifically, the compensation coefficient is obtained through multiple experiments or calibration using historical data.

[0082] To more comprehensively monitor the temperature distribution within the drying chamber, a multi-point temperature measurement method can be provided, and a three-dimensional temperature field can be reconstructed based on the multi-point temperature data.

[0083] Furthermore, the correction method for measuring the temperature of flowing tobacco shreds within the drying chamber also includes a multi-point temperature measurement method, which includes:

[0084] Multiple infrared temperature measuring devices are arranged inside the tobacco drying chamber to obtain temperature data of tobacco shreds at different locations;

[0085] Based on temperature data from different locations within the tobacco drying chamber, a three-dimensional temperature field distribution model was constructed to assess the heat flow distribution of the tobacco. This model comprehensively reflects the temperature changes of the tobacco within the chamber, helping to optimize the heating process.

[0086] Specifically, the reconstruction of the three-dimensional temperature field is modeled using finite element analysis or computational fluid dynamics techniques.

[0087] To verify the effectiveness of the correction method of this invention in measuring the temperature of flowing tobacco shreds within the drying chamber, a comparative experiment was conducted. Temperature data were measured both before and after the multi-correction process of this invention, and the effectiveness was analyzed using the experimental data. The experiment mainly used an infrared thermometer to measure the temperature of the tobacco shreds under different conditions, covering steps such as emissivity correction, distance coefficient correction, reflectivity correction, and ambient temperature compensation.

[0088] 1. Experimental subjects:

[0089] The temperature of the tobacco flowing inside the drying chamber was measured, and the temperature of the tobacco fluctuated between 28°C and 31.58°C.

[0090] 2. Measuring tools:

[0091] Infrared temperature measurement device.

[0092] 3. Variables:

[0093] Emissivity: The emissivity of tobacco varies between 0.85 and 0.95 depending on the material properties.

[0094] Measurement distance: The measurement distance between the infrared temperature measuring device and the tobacco is in the range of 1 to 2 meters.

[0095] Ambient temperature: The ambient temperature inside the cavity is maintained between 25°C and 27°C.

[0096] Reflectivity: Adjusted according to the surface characteristics of the tobacco.

[0097] 4. Experimental Groups:

[0098] Uncalibrated group: The temperature of the tobacco was measured directly using an infrared thermometer without any calibration.

[0099] Calibration group: The measurement results are processed using the emissivity correction, distance coefficient correction, reflectivity correction, and ambient temperature compensation algorithms of this invention.

[0100] 5. Measurement points:

[0101] Multiple measurement points were selected within the cavity to monitor temperature changes of the flowing tobacco at different locations.

[0102] 6. Experimental Data:

[0103] Table 1 shows the temperature data before and after correction according to the present invention. The actual temperature of the tobacco was calibrated by a high-precision measuring device.

[0104] Table 1 Temperature data (uncorrected and corrected according to the present invention)

[0105]

[0106] 7. Data Analysis:

[0107] Uncorrected group:

[0108] Uncalibrated temperature measurements have a large error, with an average error of approximately 2.75°C. This is mainly because infrared thermometry is affected by emissivity, distance, ambient temperature, and reflectivity, resulting in lower measured values ​​that cannot accurately reflect the true temperature of the tobacco.

[0109] Calibration group:

[0110] After correction using the method of this invention, the error between the measured temperature and the actual temperature is significantly reduced, with an average error of less than 0.05°C and a maximum error of 0.05°C, significantly improving the accuracy of the temperature measurement results.

[0111] The corrected temperature is very close to the true temperature, demonstrating the accuracy of the multi-correction method of the present invention in the low-temperature range, especially suitable for the temperature range of 28°C to 31.58°C.

[0112] 8. Conclusion:

[0113] Experimental results show that, within the tobacco temperature range of 28°C to 31.58°C, the uncorrected temperature measurement exhibits a significant error, with an average error of 2.75°C. However, after emissivity correction, distance coefficient correction, reflectivity correction, and ambient temperature compensation according to the present invention, the average error is significantly reduced to 0.05°C. This indicates that the correction method of the present invention effectively improves measurement accuracy within the low-temperature range and is well-suited for tobacco drying processes in industrial production.

[0114] This invention comprehensively considers the multiple influences of emissivity, measurement distance, reflectivity, and ambient temperature. Through multi-point temperature measurement, spectral analysis, and intelligent adaptive compensation algorithms, it dynamically adjusts measurement parameters to ensure more accurate tobacco temperature data. This method not only improves the accuracy of temperature measurement results but also provides reliable technical support for optimizing the tobacco drying process and improving product quality. Its main technical effects are as follows: Improved temperature measurement accuracy: Through multiple corrections of emissivity, distance, reflectivity, and ambient temperature, measurement errors are reduced, ensuring more accurate temperature data; Adaptability to dynamic working conditions: This method can respond to temperature changes of the flowing tobacco in the drying chamber in real time, dynamically adjusting compensation parameters to adapt to complex processing environments; Reduced environmental interference: By introducing reflectivity correction and ambient temperature compensation, interference from environmental radiation and other heat sources on temperature measurement is effectively reduced; Comprehensive monitoring: Combining multi-point temperature measurement and temperature field reconstruction, the temperature distribution throughout the entire drying chamber can be comprehensively monitored, helping to optimize the process; Improved production quality: Precise temperature control helps maintain the quality stability of the tobacco, thereby improving the quality and consistency of the final product.

[0115] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A correction method for measuring the temperature of flowing tobacco shreds within a drying chamber, characterized in that, It comprises the following steps: Step S1, measuring the surface temperature of the flowing cut tobacco in the cut tobacco drying chamber by using an infrared temperature measuring device to obtain initial temperature data of the measured cut tobacco; Step S2, determining the emissivity of the measured cut tobacco, and correcting the initial temperature data according to the emissivity; Step S3, calculating the ratio of the measurement distance and the thickness of the cut tobacco as a distance coefficient, and correcting the temperature data obtained in the previous step according to the distance coefficient; Step S4, correcting the temperature data obtained in the previous step according to the reflectivity of the cut tobacco surface; Step S5, applying an ambient temperature compensation algorithm to correct the temperature data obtained in the previous step; Step S6, outputting the corrected cut tobacco temperature data; The specific content of correcting the initial temperature data according to the emissivity is: According to the material, surface texture, and color characteristics of the cut tobacco, an appropriate emissivity value is selected or calibrated, and the initial temperature data is corrected using the following formula: ； wherein: T measured is the corrected temperature; E is the measured infrared radiant energy; τ is the transmissivity of the air medium; is the emissivity of the object being measured; σ is the Stefan-Boltzmann constant; The specific content of correcting the temperature data obtained in the previous step according to the distance coefficient is: The temperature data obtained in the previous step is corrected using the following formula: ； wherein: T corrected is the temperature after distance correction; a is a correction factor related to the attenuation rate of infrared radiation energy; K0 is the ratio of the measured distance to the tobacco thickness under calibration conditions; K is the value of K measured at a standard distance when measuring the tobacco temperature; The calculation formula of the distance coefficient K is: ； wherein d measure is the distance between the infrared temperature measuring device and the measured tobacco, d smoke is the thickness of the tobacco; The specific content of correcting the temperature data obtained in the previous step according to the reflectivity of the cut tobacco surface is: The following formula is used for correction: ； wherein: T final is the corrected temperature; T b is the uncorrected temperature; The specific content of correcting the temperature data obtained in the previous step by applying an ambient temperature compensation algorithm is: The ambient temperature data in the cut tobacco drying chamber is collected, and the difference between the ambient temperature and the temperature data obtained in the previous step is calculated; the following formula is used for correction: ； wherein: T compensated is the temperature corrected for ambient temperature; T env is the ambient temperature; T smoke is the initial temperature data of the tobacco measured; k is a compensation factor.

2. A correction method for measuring temperature of tobacco shreds flowing in a tobacco shred heating chamber according to claim 1, wherein, The specific method for obtaining the correction coefficient α is: At different distances d measure Next, the surface temperature T of the measured tobacco is measured measured ; the reference temperature under the contrast standard distance is compared, the temperature attenuation trend at different distances is analyzed; and the value of a is fitted according to these experimental data.

3. A correction method for measuring temperature of tobacco shreds flowing in a tobacco shred heating chamber according to claim 1, wherein, The compensation coefficient is obtained through multiple experiments and historical data calibration.

4. A correction method for measuring temperature of tobacco shreds flowing in a tobacco shred chamber according to any one of claims 1 to 3, characterized in that, It also includes a multi-point temperature measurement method, which comprises: Arranging multiple infrared temperature measuring devices in the cut tobacco drying chamber to obtain temperature data of cut tobacco at different positions; According to the temperature data of cut tobacco at different positions, a three-dimensional temperature field in the cut tobacco drying chamber is reconstructed to evaluate the heat flow distribution of the cut tobacco.

5. A correction method for measuring temperature of tobacco shreds flowing in a tobacco shred heating chamber according to claim 4, wherein, The reconstruction of the three-dimensional temperature field is modeled using finite element analysis or computational fluid dynamics technology.

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