Method for obtaining the thermal weight loss characteristics of tobacco

Abstract

The present disclosure relates to a method for acquiring the thermal weight loss characteristics of tobacco, comprising the following steps: obtaining a Raman spectrum curve of a tobacco sample to be tested; selecting a first and a second Raman spectrum curve segment on the Raman spectrum curve; connecting two end points of the first and the second Raman spectrum curve segments to obtain a first and a second straight line segment; obtaining a first and a second Raman parameter number set of the tobacco sample to be tested according to the difference information of the Raman intensity of the point sets on the first and the second Raman spectrum curve segments corresponding to the corresponding point sets on the first and the second straight line segments; comparing the first and the second Raman parameter number sets of the tobacco sample to be tested with the first and the second Raman parameter number sets of a plurality of tobacco samples with known thermal weight loss characteristics to obtain the first and the second thermal weight loss characteristic curves of the tobacco samples with known thermal weight loss characteristics; obtaining a thermal weight loss characteristic curve of the tobacco sample to be tested according to the first and the second thermal weight loss characteristic curves; and the thermal weight loss characteristics of the tobacco sample to be tested can be obtained quickly.

Description

Technical Field

[0001] The present disclosure relates to the technical field of rapid tobacco detection, and in particular to a method for obtaining thermal weight loss characteristics of tobacco. Background Art

[0002] Tobacco is an important economic crop in my country. The quality of tobacco has a great impact on the sales of cigarettes. Obtaining the combustion characteristics of cigarettes during the actual smoking process can effectively reflect the quality of cigarettes and predict the quality style of cigarettes.

[0003] At present, the thermal weight loss characteristic curve of tobacco is mainly obtained through thermogravimetric analysis. Due to the limitation of the principle of thermogravimetric analyzer, the detection time of thermogravimetric analysis is usually more than one hour, and the accuracy of the test process is required to be high. Therefore, the efficiency of thermogravimetric analysis technology is low, and rapid detection cannot be achieved. In important links such as leaf threshing and re-drying, the actual application effect is limited. How to quickly and comprehensively obtain the thermal weight loss characteristics of tobacco raw materials in production is a technical difficulty in the field of tobacco analysis. Summary of the invention

[0004] Some embodiments of the present disclosure provide a method for acquiring thermal weight loss characteristics of tobacco, which is used to alleviate the problem of low efficiency in detecting thermal weight loss characteristics of tobacco.

[0005] In one aspect of the present disclosure, a method for obtaining the thermal weight loss characteristics of tobacco is provided, comprising the following steps:

[0006] S10: testing the tobacco sample to be tested by using a Raman spectrometer to obtain a Raman spectrum curve of Raman shift-Raman intensity;

[0007] S20: selecting a first Raman shift segment and a second Raman shift segment on the Raman spectrum curve, and obtaining a first Raman spectrum curve segment and a second Raman spectrum curve segment respectively;

[0008] S30: connecting two end points of the first Raman spectrum curve segment to obtain a first straight line segment; connecting two end points of the second Raman spectrum curve segment to obtain a second straight line segment;

[0009] S40: Obtaining a first Raman parameter number set I of the tobacco sample to be tested according to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment. op1 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second Raman parameter number set I of the tobacco sample to be tested is obtained. op2 ;

[0010] S50: The first Raman parameter number set I of the tobacco sample to be tested is op1The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare one by one, select the tobacco sample with known thermal gravimetric characteristics that is closest to the first Raman parameter number set of the tobacco sample to be tested, and obtain the first thermal gravimetric characteristic curve of the tobacco sample with known thermal gravimetric characteristics; op2 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Comparing one by one, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter number set of the tobacco sample to be tested, and obtaining a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics;

[0011] S60: taking an average value of the data sets on the first thermogravimetric characteristic curve and the second thermogravimetric characteristic curve to obtain a thermogravimetric characteristic curve of the tobacco sample to be tested, and then obtaining the thermogravimetric characteristics of the tobacco sample to be tested.

[0012] In some embodiments, in step S20, the Raman shift corresponding to the first Raman shift segment is 800 cm -1 ~1800cm -1 , and / or, the Raman shift corresponding to the second Raman shift segment is 2700cm -1 ~3500cm -1 .

[0013] In some embodiments, in step S40, the first Raman parameter number set I of the tobacco sample to be tested op1 The first peak Raman parameter set I of the tobacco sample to be tested is included p1 According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first peak Raman parameter number set I of the tobacco sample to be tested is obtained. p1 The methods include:

[0014] A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I R1 ;

[0015] Select the first maximum peak I on the first Raman spectrum curve segment max1 ;

[0016] The first Raman peak number set I R1 Each Raman peak in is divided by I max1 , obtain the first peak Raman parameter set I of the tobacco sample to be tested p1 .

[0017] In some embodiments, in step S40, the first Raman parameter number set I of the tobacco sample to be tested op1 A first area Raman parameter set I comprising a tobacco sample to be tested o1 According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first area Raman parameter number set I of the tobacco sample to be tested is obtained. o1 The methods include:

[0018] A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I R1 , for the first Raman peak number set I R1 Integrate and sum the formed first curve to obtain a first area value A1;

[0019] The first Raman peak number set I R1 Divide each Raman peak in by A1 to obtain the first area Raman parameter number set I of the tobacco sample to be tested. o1 .

[0020] In some embodiments, in step S40, the second Raman parameter number set I of the tobacco sample to be tested op2 The second peak Raman parameter set I of the tobacco sample to be tested p2 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second peak Raman parameter number set I of the tobacco sample to be tested is obtained. p2 The methods include:

[0021] A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the second straight line segment to obtain a second Raman peak value set I R2 ;

[0022] Select the second maximum peak I on the second Raman spectrum curve segment max2 ;

[0023] The second Raman peak number set I R2 Each Raman peak in is divided by I max2 , obtain the second peak Raman parameter set I of the tobacco sample to be tested p2 .

[0024] In some embodiments, in step S40, the second Raman parameter number set I of the tobacco sample to be tested op2 A second area Raman parameter set I comprising the tobacco sample to be tested o2According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second area Raman parameter number set I of the tobacco sample to be tested is obtained. o2 The methods include:

[0025] A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensities corresponding to the plurality of Raman shifts are subtracted from the Raman intensities corresponding to the corresponding Raman shifts on the second straight line segment to obtain a second Raman peak value set I R2 , for the second Raman peak number set I R2 Integrate and sum the formed second curve to obtain a second area value A2;

[0026] The second Raman peak number set I R2 Each Raman peak in is divided by A2 to obtain a second area Raman parameter number set I of the tobacco sample to be tested. o2 .

[0027] In some embodiments, in step 50, the first Raman parameter number set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare them one by one, including:

[0028] The first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 Including the first peak Raman parameter set I' p1 ;

[0029] According to the formula: Calculate and obtain m D 11 value, m D 11 The values ​​are sorted in order of size;

[0030] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first peak Raman parameter set I of the tobacco samples to be tested. p1 The number of the first peak Raman parameters, I p1i Represents the first peak Raman parameter set I of the tobacco sample to be tested p1 The i-th first peak Raman parameter in p1i The first peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p1 The Raman parameter of the i-th first peak in .

[0031] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the first Raman parameter number set of the tobacco sample to be tested, and obtaining a first thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0032] In m D 11 Select the smallest D value 11 value, determine the minimum D 11 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the first thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0033] In some embodiments, in step 50, the first Raman parameter number set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare them one by one, including:

[0034] The first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 Including the first area Raman parameter set I' o1 ;

[0035] According to the formula: Calculate and obtain m D 12 value, m D 12 The values ​​are sorted in order of size;

[0036] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first area Raman parameter set I of the tobacco samples to be tested. o1 The number of the first area Raman parameters, I o1i Represents the first area Raman parameter set I of the tobacco sample to be tested o1 The i-th first area Raman parameter in o1i The first area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o1 The i-th first area Raman parameter in .

[0037] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the first Raman parameter set of the tobacco sample to be tested, and obtaining a first thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0038] In m D 12 Select the smallest D value 12 value, determine the minimum D 12 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the first thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0039] In some embodiments, in step 50, the second Raman parameter number set I of the tobacco sample to be tested isop1 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Compare them one by one, including:

[0040] The second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift section op2 Including the second peak Raman parameter set I' p2 ;

[0041] According to the formula: Calculate and obtain m D 21 value, m D 21 The values ​​are sorted in order of size;

[0042] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second peak Raman parameter set I of the tobacco samples to be tested. p2 The number of the second peak Raman parameters, I p2i Represents the second peak Raman parameter set I of the tobacco sample to be tested p2 The i-th second peak Raman parameter in p2i The second peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p2 The Raman parameter of the i-th second peak in .

[0043] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter number set of the tobacco sample to be tested, and obtaining a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0044] In m D 21 Select the smallest D value 21 value, determine the minimum D 21 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the second thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0045] In some embodiments, in step 50, the second Raman parameter number set I of the tobacco sample to be tested is op2 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Compare them one by one, including:

[0046] The second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift section op2 Including the second area Raman parameter set I' o2 ;

[0047] According to the formula: Calculate and obtain m D 22 value, m D 22 The values ​​are sorted in order of size;

[0048] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second area Raman parameter number set I of the tobacco samples to be tested. o2 The number of the second area Raman parameters, I o2i Represents the second area Raman parameter number set I of the tobacco sample to be tested o2 The i-th second area Raman parameter in o2i The second area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o2 The i-th second area Raman parameter in .

[0049] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter number set of the tobacco sample to be tested, and obtaining a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0050] In m D 22 Select the smallest D value 22 value, determine the minimum D 22 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the second thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0051] In some embodiments, in step S50, the first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 , and the second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift segment op2 The methods for obtaining include:

[0052] S100: testing the tobacco sample using a Raman spectrometer to obtain a Raman spectrum curve of Raman shift-Raman intensity;

[0053] S200: selecting a first Raman shift segment and a second Raman shift segment on the Raman spectrum curve, and obtaining a first Raman spectrum curve segment and a second Raman spectrum curve segment respectively;

[0054] S300: connecting two end points of the first Raman spectrum curve segment to obtain a first straight line segment; connecting two end points of the second Raman spectrum curve segment to obtain a second straight line segment;

[0055] S400: Obtaining a first Raman parameter number set I′ of the tobacco sample according to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment op1 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second Raman parameter number set I′ of the tobacco sample is obtained. op2 .

[0056] Based on the above technical solution, the present disclosure has at least the following beneficial effects:

[0057] In some embodiments, the Raman spectrum data of the tobacco sample is associated with the thermal weight loss characteristics, and based on the Raman spectrum data of the tobacco sheet to be tested, a thermal weight loss characteristic curve can be quickly obtained, thereby achieving the thermal weight loss characteristics of the tobacco sample in a very short time or online; and by connecting the two end points of the Raman spectrum curve segment, a straight line segment is obtained, and the straight line segment is basically a line segment generated by the fluorescence signal, and then by obtaining the difference information of the Raman intensity of the point set on the Raman spectrum curve segment and the corresponding point set on the straight line segment, the Raman parameter number set of the tobacco sample to be tested is obtained, which can effectively remove the interference of the fluorescence signal on the thermal weight loss characteristics of the tobacco, and achieve accurate acquisition of the thermal weight loss characteristics of the tobacco. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0059] Figure 1 A schematic flow chart of a method for obtaining the thermal weight loss characteristics of tobacco according to some embodiments of the present disclosure;

[0060] Figure 2 A schematic diagram of a first Raman shift segment selected from a Raman spectrum curve according to some embodiments of the present disclosure;

[0061] Figure 3 A schematic diagram of a second Raman shift segment selected from a Raman spectrum curve according to some embodiments of the present disclosure.

[0062] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0063] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0064] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0066] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0067] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0068] Figure 1 Schematic diagram of some embodiments of the method for obtaining the thermal weight loss characteristics of tobacco according to the present disclosure. Figure 1 In some embodiments, the method for obtaining the thermal weight loss characteristics of tobacco includes the following steps:

[0069] S10: testing the tobacco sample to be tested by using a Raman spectrometer to obtain a Raman spectrum curve of Raman shift-Raman intensity;

[0070] S20: selecting a first Raman shift segment and a second Raman shift segment on the Raman spectrum curve, and obtaining a first Raman spectrum curve segment and a second Raman spectrum curve segment respectively;

[0071] S30: Connect the two end points of the first Raman spectrum curve segment to obtain a first straight line segment A1B1, referring to Figure 2 ; Connect the two endpoints of the second Raman spectrum curve segment to obtain the second straight line segment A2B2, reference Figure 3 ;

[0072] S40: Obtaining a first Raman parameter number set I of the tobacco sample to be tested according to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment. op1 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second Raman parameter number set I of the tobacco sample to be tested is obtained. op2 ;

[0073] S50: The first Raman parameter number set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare one by one, select the tobacco sample with known thermal gravimetric characteristics that is closest to the first Raman parameter number set of the tobacco sample to be tested, and obtain the first thermal gravimetric characteristic curve of the tobacco sample with known thermal gravimetric characteristics; op2 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Comparing one by one, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter number set of the tobacco sample to be tested, and obtaining a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics;

[0074] S60: taking an average value of the data sets on the first thermogravimetric characteristic curve and the second thermogravimetric characteristic curve to obtain a thermogravimetric characteristic curve of the tobacco sample to be tested, and then obtaining the thermogravimetric characteristics of the tobacco sample to be tested.

[0075] The thermogravimetric characteristic curves (the first thermogravimetric characteristic curve and the second thermogravimetric characteristic curve) of the tobacco sample with known thermogravimetric characteristics can be obtained by conventional thermogravimetric testing technology.

[0076] The method for obtaining the thermal weight loss characteristics of tobacco provided in the embodiments of the present disclosure is based on Raman spectroscopy detection technology, and Raman spectroscopy detection is fast, convenient, and accurate. The chemical structure characteristics of tobacco can be quickly obtained by analyzing the Raman spectral parameters of tobacco. The thermal weight loss characteristics of tobacco are essentially determined by the chemical result characteristics of tobacco. Therefore, there is a certain correlation between the Raman spectral data of tobacco and the thermal weight loss characteristic curve in theory. Establishing the correlation between the Raman spectrum of tobacco and the thermal weight loss characteristic curve is the key to quickly obtaining the thermal weight loss characteristics of tobacco. The method for obtaining the thermal weight loss characteristics of tobacco provided in the embodiments of the present disclosure can quickly output a thermal weight loss characteristic curve similar to the tobacco sample to be tested by quickly obtaining the Raman spectrum of the tobacco sample, so as to obtain the thermal weight loss characteristics of the tobacco sample to be tested in a very short time or online, and solve the problem of slow acquisition of thermal weight loss characteristics proposed in the background technology.

[0077] Since tobacco has fluorescence characteristics, which are its own chemical properties, the general trend of the Raman spectrum curve is to go diagonally downward along the increase of Raman shift. The fluorescence signal generated by the fluorescence characteristics of tobacco will cover the characteristics of the tobacco itself, affecting the Raman spectrum curve of the tobacco, and further affecting the analysis of the thermal weight loss characteristics of the tobacco. Therefore, in the embodiment of the present disclosure, the two end points of the first Raman spectrum curve segment are connected to obtain a first straight line segment, and the two end points of the second Raman spectrum curve segment are connected to obtain a second straight line segment. The first straight line segment and the second straight line segment are basically segments generated by the fluorescence signal. Then, by obtaining the difference information of the Raman intensity between the point set on the Raman spectrum curve segment and the corresponding point set on the straight line segment, the Raman parameter number set of the tobacco sample to be tested is obtained, which can effectively remove the interference of the fluorescence signal on the thermal weight loss characteristics of the tobacco, and realize the accurate acquisition of the thermal weight loss characteristics of the tobacco.

[0078] In some embodiments, the first Raman spectrum curve segment is a first-order Raman spectrum curve segment.

[0079] In some embodiments, the second Raman spectrum curve segment is a second-order Raman spectrum curve segment.

[0080] In some embodiments, in step S20, the Raman shift corresponding to the first Raman shift segment is 800 cm -1 ~1800cm -1 .

[0081] Raman shift is 800 cm -1 ~1800cm -1 The corresponding first Raman spectrum curve segment is the spectrum segment reflecting the carbon skeleton structure of the tobacco sample, and the carbon skeleton structure is the chemical structure that determines the thermal weight loss characteristics of tobacco. The Raman data of this band can be well correlated with the thermogravimetric curve.

[0082] In some embodiments, in step S20, the Raman shift corresponding to the second Raman shift segment is 2700 cm -1 ~3500cm -1 .

[0083] Raman shift is 2700cm -1 ~3500cm -1 The corresponding second Raman spectrum curve segment is the spectrum segment that reflects the carbon skeleton structure of the tobacco sample, and the carbon skeleton structure is the chemical structure that determines the thermal weight loss characteristics of tobacco. The Raman data of this band can be well correlated with the thermogravimetric curve.

[0084] In some embodiments, in step S40, the first Raman parameter number set I of the tobacco sample to be tested op1 The first peak Raman parameter set I of the tobacco sample to be tested is included p1 According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first peak Raman parameter number set I of the tobacco sample to be tested is obtained. p1 The methods include:

[0085] A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I R1 ;

[0086] Select the first maximum peak I on the first Raman spectrum curve segment max1 ,refer to Figure 2 Point C1 in

[0087] The first Raman peak number set I R1 Each Raman peak in is divided by I max1 , obtain the first peak Raman parameter set I of the tobacco sample to be tested p1 .

[0088] The multiple Raman shifts selected on the first Raman spectrum curve segment may be tens, hundreds, one thousand or several thousand, or even more, so as to accurately obtain the thermal weight loss characteristics of tobacco.

[0089] In some embodiments, in step S40, the first Raman parameter number set I of the tobacco sample to be tested op1 A first area Raman parameter set I comprising a tobacco sample to be tested o1 According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first area Raman parameter number set I of the tobacco sample to be tested is obtained. o1 The methods include:

[0090] A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I R1 , for the first Raman peak number set I R1 Integrate and sum the formed first curve to obtain a first area value A1;

[0091] The first Raman peak number set I R1 Divide each Raman peak in by A1 to obtain the first area Raman parameter number set I of the tobacco sample to be tested. o1 .

[0092] In some embodiments, in step S40, the second Raman parameter number set I of the tobacco sample to be tested op2 The second peak Raman parameter set I of the tobacco sample to be tested p2 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second peak Raman parameter number set I of the tobacco sample to be tested is obtained. p2 The methods include:

[0093] A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the second straight line segment to obtain a second Raman peak value set I R2 ;

[0094] Select the second maximum peak I on the second Raman spectrum curve segment max2 ,refer to Figure 3 Point C2 in

[0095] The second Raman peak number set I R2 Each Raman peak in is divided by I max2 , obtain the second peak Raman parameter set I of the tobacco sample to be tested p2 .

[0096] The multiple Raman shifts selected on the second Raman spectrum curve segment may be tens, hundreds, one thousand or several thousand, or even more, so as to accurately obtain the thermal weight loss characteristics of tobacco.

[0097] In some embodiments, in step S40, the second Raman parameter number set I of the tobacco sample to be tested op2 A second area Raman parameter set I comprising the tobacco sample to be tested o2 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second area Raman parameter number set I of the tobacco sample to be tested is obtained. o2 The methods include:

[0098] A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the second straight line segment to obtain a second Raman peak value set I R2 , for the second Raman peak number set I R2 Integrate and sum the formed second curve to obtain a second area value A2;

[0099] The second Raman peak number set I R2 Each Raman peak in is divided by A2 to obtain a second area Raman parameter number set I of the tobacco sample to be tested. o2 .

[0100] In some embodiments, in step 50, the first Raman parameter set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare them one by one, including:

[0101] The first Raman parameter set I of the tobacco sample to be tested op1 The first peak Raman parameter set I of the tobacco sample to be tested is included p1 ;

[0102] The first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 Including the first peak Raman parameter set I' p1 ;

[0103] According to the formula: Calculate and obtain m D 11 value, m D 11 The values ​​are sorted in order of size;

[0104] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first peak Raman parameter set I of the tobacco samples to be tested. p1 The number of the first peak Raman parameters, I p1i Represents the first peak Raman parameter set I of the tobacco sample to be tested p1 The i-th first peak Raman parameter in p1i The first peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p1 The Raman parameter of the i-th first peak in .

[0105] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the first Raman parameter set of the tobacco sample to be tested, and obtaining a first thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0106] In m D 11 Select the smallest D value 11 value, determine the minimum D 11 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the first thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0107] In some embodiments, in step 50, the first Raman parameter set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare them one by one, including:

[0108] The first Raman parameter set I of the tobacco sample to be tested op1 A first area Raman parameter set I comprising a tobacco sample to be tested o1 ;

[0109] The first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 Including the first area Raman parameter set I' o1 ;

[0110] According to the formula: Calculate and obtain m D 12 value, m D 12 The values ​​are sorted in order of size;

[0111] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first area Raman parameter set I of the tobacco samples to be tested. o1 The number of the first area Raman parameters, I o1i Represents the first area Raman parameter set I of the tobacco sample to be tested o1 The i-th first area Raman parameter in o1i The first area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o1 The i-th first area Raman parameter in .

[0112] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the first Raman parameter set of the tobacco sample to be tested, and obtaining a first thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0113] In m D 12 Select the smallest D value 12 value, determine the minimum D 12The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the first thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0114] In some embodiments, in step 50, the second Raman parameter data set I of the tobacco sample to be tested is op1 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Compare them one by one, including:

[0115] The second Raman parameter set I of the tobacco sample to be tested op2 The second peak Raman parameter set I of the tobacco sample to be tested p2 ;

[0116] The second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift section op2 Including the second peak Raman parameter set I' p2 ;

[0117] According to the formula: Calculate and obtain m D 21 value, m D 21 The values ​​are sorted in order of size;

[0118] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second peak Raman parameter set I of the tobacco samples to be tested. p2 The number of the second peak Raman parameters, I p2i Represents the second peak Raman parameter set I of the tobacco sample to be tested p2 The i-th second peak Raman parameter in p2i The second peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p2 The Raman parameter of the i-th second peak in .

[0119] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter set of the tobacco sample to be tested, and obtaining a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0120] In m D 21 Select the smallest D value 21 value, determine the minimum D 21 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the second thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0121] In some embodiments, in step 50, the second Raman parameter data set I of the tobacco sample to be tested is op2 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Compare them one by one, including:

[0122] The second Raman parameter set I of the tobacco sample to be tested op2 A second area Raman parameter set I comprising the tobacco sample to be tested o2 ;

[0123] The second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift section op2 Including the second area Raman parameter set I' o2 ;

[0124] According to the formula: Calculate and obtain m D 22 value, m D 22 The values ​​are sorted in order of size;

[0125] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second area Raman parameter number set I of the tobacco samples to be tested. o2 The number of the second area Raman parameters, I o2i Represents the second area Raman parameter number set I of the tobacco sample to be tested o2 The i-th second area Raman parameter in o2i The second area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o2 The i-th second area Raman parameter in .

[0126] In some embodiments, in step S50, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter set of the tobacco sample to be tested, and obtaining a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics includes:

[0127] In M D 22 Select the smallest D value 22 value, determine the minimum D 22 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the second thermal gravimetric characteristic curve of the tobacco sample to be tested.

[0128] In some embodiments, in step 60, the data sets on the two first thermogravimetric characteristic curves and the two second thermogravimetric characteristic curves are averaged to obtain the thermogravimetric characteristic curve of the tobacco sample to be tested, thereby obtaining the thermogravimetric characteristics of the tobacco sample to be tested.

[0129] The two first thermogravimetric characteristic curves include:

[0130] The first peak Raman parameter set I of the tobacco sample to be tested p1 The first peak Raman parameter set I′ of tobacco samples with known thermogravimetric properties p1 Comparing the obtained first thermogravimetric characteristic curves of the tobacco sample to be tested; and

[0131] The first area Raman parameter set I of the tobacco sample to be tested o1 The first area Raman parameter set I′ of tobacco samples with known thermogravimetric properties o1 The first thermogravimetric characteristic curves of the tobacco samples to be tested are compared.

[0132] The two second thermogravimetric characteristic curves include:

[0133] The second peak Raman parameter set I of the tobacco sample to be tested p2 The second peak Raman parameter set I′ of tobacco samples with known thermogravimetric properties p2 Comparing the obtained second thermogravimetric characteristic curves of the tobacco sample to be tested; and

[0134] The second area Raman parameter set I of the tobacco sample to be tested o2 The second area Raman parameter set I′ of tobacco samples with known thermogravimetric properties o2 Compare the obtained second thermogravimetric characteristic curves of the tobacco samples to be tested.

[0135] In some embodiments, in step S50, the first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 , and the second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift segment op2 The methods for obtaining include:

[0136] S100: testing a tobacco sample (a tobacco sample with known thermal gravimetric properties) using a Raman spectrometer to obtain a Raman spectrum curve of Raman shift-Raman intensity;

[0137] S200: selecting a first Raman shift segment and a second Raman shift segment on the Raman spectrum curve, and obtaining a first Raman spectrum curve segment and a second Raman spectrum curve segment respectively;

[0138] S300: connecting two end points of the first Raman spectrum curve segment to obtain a first straight line segment; connecting two end points of the second Raman spectrum curve segment to obtain a second straight line segment;

[0139] S400: Obtaining a first Raman parameter number set I′ of the tobacco sample according to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment op1 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second Raman parameter number set I′ of the tobacco sample is obtained. op2 .

[0140] In some embodiments, the first Raman spectrum curve segment is a first-order Raman spectrum curve segment.

[0141] In some embodiments, the second Raman spectrum curve segment is a second-order Raman spectrum curve segment.

[0142] In some embodiments, in step S200, the Raman shift corresponding to the first Raman shift segment is 800 cm -1 ~1800cm -1 .

[0143] Raman shift is 800 cm -1 ~1800cm -1 The corresponding first Raman spectrum curve segment is the spectrum segment reflecting the carbon skeleton structure of the tobacco sample, and the carbon skeleton structure is the chemical structure that determines the thermal weight loss characteristics of tobacco. The Raman data of this band can be well correlated with the thermogravimetric curve.

[0144] In some embodiments, in step S200, the Raman shift corresponding to the second Raman shift segment is 2700 cm -1 ~3500cm -1 .

[0145] Raman shift is 2700cm -1 ~3500cm -1 The corresponding second Raman spectrum curve segment is the spectrum segment that reflects the carbon skeleton structure of the tobacco sample, and the carbon skeleton structure is the chemical structure that determines the thermal weight loss characteristics of tobacco. The Raman data of this band can be well correlated with the thermogravimetric curve.

[0146] In some embodiments, in step S400, the first Raman parameter set I′ of the tobacco sample op1 The first peak Raman parameter set I′ of the tobacco sample p1 , according to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first peak Raman parameter number set I′ of the tobacco sample is obtained. p1 The methods include:

[0147] A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I′ R1 ;

[0148] Select the first maximum peak I′ on the first Raman spectrum curve segment max1 ;

[0149] The first Raman peak number set I′ R1 Each Raman peak in is divided by I′ max1 , obtain the first peak Raman parameter set I′ of tobacco samples p1 .

[0150] The multiple Raman shifts selected on the first Raman spectrum curve segment may be tens, hundreds, one thousand or several thousand, or even more, so as to accurately obtain the thermal weight loss characteristics of tobacco.

[0151] In some embodiments, in step S400, the first Raman parameter set I′ of the tobacco sample op1 The first area Raman parameter set I′ comprising tobacco samples o1 According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first area Raman parameter number set I′ of the tobacco sample is obtained. o1 The methods include:

[0152] A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I′ R1 , for the first Raman peak number set I′ R1 The first curve is integrated and summed to obtain a first area value A′1;

[0153] The first Raman peak number set I′ R1 Divide each Raman peak in by A′1 to obtain the first area Raman parameter set I′ of the tobacco sample o1 .

[0154] In some embodiments, in step S400, the second Raman parameter set I′ of the tobacco sample op2 The second peak Raman parameter set I′ including tobacco samples p2 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second peak Raman parameter number set I′ of the tobacco sample is obtained. p2 The methods include:

[0155] A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensities corresponding to the plurality of Raman shifts are subtracted from the Raman intensities corresponding to the corresponding Raman shifts on the second straight line segment to obtain a second Raman peak value set I′. R2 ;

[0156] Select the second maximum peak I′ on the second Raman spectrum curve segment max2 ;

[0157] The second Raman peak number set I′ R2 Each Raman peak in is divided by I′ max2 , obtain the second peak Raman parameter set I′ of tobacco samples p2 .

[0158] The multiple Raman shifts selected on the second Raman spectrum curve segment may be tens, hundreds, one thousand or several thousand, or even more, so as to accurately obtain the thermal weight loss characteristics of tobacco.

[0159] In some embodiments, in step S400, the second Raman parameter set I′ of the tobacco sample op2 The second area Raman parameter set I′ comprising tobacco samples o2 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second area Raman parameter number set I′ of the tobacco sample is obtained. o2 The methods include:

[0160] A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensities corresponding to the plurality of Raman shifts are subtracted from the Raman intensities corresponding to the corresponding Raman shifts on the second straight line segment to obtain a second Raman peak value set I′. R2 , for the second Raman peak number set I′ R2 The formed second curve is integrated and summed to obtain a second area value A′2;

[0161] The second Raman peak number set I′ R2 Each Raman peak in is divided by A′2 to obtain the second area Raman parameter number set I′ of the tobacco sample. o2 .

[0162] In some embodiments, the method for obtaining the thermal weight loss characteristics of tobacco further includes step S00: using conventional thermogravimetric analysis technology to test multiple groups of tobacco samples of different quality styles, obtaining the thermal weight loss characteristic curves corresponding to each tobacco sample, and using them as tobacco samples with known thermal weight loss characteristics, establishing the thermal weight loss characteristic curves of the tobacco samples with known thermal weight loss characteristics and their first Raman parameter number set I′ op1 and the second Raman parameter set I op2 association.

[0163] In some embodiments, in step S10 and / or step S100, the Raman spectrometer used includes a Fourier transform Raman spectrometer.

[0164] In some embodiments, in step S10 and / or step S100, the wavelength of the laser of the Raman spectrometer is selected to be 785 nm or 1064 nm.

[0165] In a preferred or optional embodiment, in step S10 and / or step S100, the wavelength of the laser of the Raman spectrometer is selected to be 1064 nm.

[0166] The 1064nm laser source can effectively reduce the fluorescence characteristics of tobacco, making the interference caused by the fluorescence characteristics in tobacco smaller.

[0167] In some embodiments, in step S10 and / or step S100, the laser power of the laser of the Raman spectrometer is selected to be 10 mW to 150 mW.

[0168] The stronger the laser power, the stronger the Raman signal obtained. However, excessive laser power may cause the sample to be damaged by the laser. Selecting a laser power of 10mW to 150mW can obtain a Raman spectrum with a high signal-to-noise ratio without damaging the sample.

[0169] In some embodiments, in step S10 and / or step S100, the number of test spectrum superpositions of the Raman spectrometer is set to 300 times or more.

[0170] Since the signal intensity of tobacco Raman spectrum is weak, multiple scans are required to superimpose the signal and eliminate noise interference to enhance the signal intensity and improve the signal-to-noise ratio. Therefore, based on the characteristics of tobacco samples, the number of superpositions must be greater than or equal to 300 times.

[0171] In some embodiments, step S10 and / or step S100 include: selecting more than eight position points of the tobacco sample to be tested, using a Raman spectrometer to detect the more than eight position points, obtaining more than eight groups of values, and obtaining a Raman spectrum curve regarding Raman shift-Raman intensity based on the average value of the more than eight groups of values.

[0172] The structural uniformity of tobacco samples, the homogeneity and standard deviation of Raman spectral signals are affected by the number of tests. When the number of test points is more than eight, the random error of the test can be lower.

[0173] In some preferred or optional embodiments, the method for obtaining the thermal weight loss characteristics of tobacco based on Raman spectroscopy technology comprises the following steps:

[0174] S1: Use thermogravimetric analysis to test no less than 200 groups of tobacco samples of different quality and style, and obtain the corresponding thermogravimetric characteristic curve of each tobacco sample; the thermogravimetric analysis test temperature range is 150℃~1200℃, and the heating rate does not exceed 50℃ / min;

[0175] S2: Selecting a Fourier transform Raman spectrometer to test the tobacco samples of different quality styles in step S1; selecting the laser wavelength of the Raman spectrometer to be 785nm or 1064nm, preferably 1064nm, the laser power to be 10mW to 150mW, the test stacking to be 300 times or more, and the number of test points to be more than 8;

[0176] Among them, the Fourier transform Raman spectrometer can be a Nicolet iS50R FT-IR / Raman spectrometer, and an InGaAs detector cooled in liquid nitrogen is used to detect and collect Raman signals. The laser wavelength can be 1064nm, the laser power can be 50mw, and the microscope magnification is 50 times;

[0177] S3: Analyze and process the Raman spectrum data obtained in step S2. Select the Raman shift of 800 cm -1 ~1800cm -1 The first Raman spectral curve segment is defined as the first-order Raman curve segment, and the Raman shift is selected as 2700 cm -1 ~3500cm -1 The second Raman spectrum curve segment is defined as a second-order Raman curve segment; the two end points of the first Raman spectrum curve segment are connected to obtain a first straight line segment; the two end points of the second Raman spectrum curve segment are connected to obtain a second straight line segment;

[0178] According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first Raman parameter number set I′ of the tobacco sample is obtained. op1 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second Raman parameter number set I′ of the tobacco sample is obtained. op2 ;

[0179] The first Raman parameter set I′ of tobacco samples op1 The first peak Raman parameter set I′ of the tobacco sample p1 and the first area Raman parameter set I′ o1 ;

[0180] A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I′ R1 , to eliminate the fluorescence effect of the biomass itself;

[0181] Select the first maximum peak I′ on the first Raman spectrum curve segment max1 ;

[0182] The first Raman peak number set I′ R1 Each Raman peak in is divided by I′ max1 , obtain the first peak Raman parameter set I′ of tobacco samples p1 ;

[0183] For example: I′ p1i =I′ R1i / I′ max1 ;

[0184] Among them, I′ p1i is the first peak Raman parameter set I′ of tobacco samples p1 The Raman parameter of the ith peak in R1i is the first Raman peak number set I′ R1 The i-th Raman peak in .

[0185] The number of Raman shifts selected on the first Raman spectrum curve segment is n, and the value of i is [1, n].

[0186] For the first Raman peak number set I′ R1 The first curve is integrated and summed to obtain a first area value A′1; the first Raman peak value set I′ R1 Divide each Raman peak in by A′1 to obtain the first area Raman parameter set I′ of the tobacco sample o1 ;

[0187] For example: I′ o1i =I′ R1i / A′1;

[0188] Among them, I′ o1i is the first area Raman parameter set I′ of tobacco samples o1 The i-th area Raman parameter in R1i is the first Raman peak number set I′ R1 The i-th Raman peak in .

[0189] The number of Raman shifts selected on the first Raman spectrum curve segment is n, and the value of i is [1, n].

[0190] The second Raman parameter set I′ of tobacco samples op2 The second peak Raman parameter set I′ including tobacco samples p2 and the second area Raman parameter set I′ p2 ;

[0191] A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensities corresponding to the plurality of Raman shifts are subtracted from the Raman intensities corresponding to the corresponding Raman shifts on the second straight line segment to obtain a second Raman peak value set I′. R2 , to eliminate the fluorescence effect of the biomass itself;

[0192] Select the second maximum peak I′ on the second Raman spectrum curve segment max2 ;

[0193] The second Raman peak number set I′ R2 Each Raman peak in is divided by I′ max2 , obtain the second peak Raman parameter set I′ of tobacco samples p2 ;

[0194] For example: I′ p2i =I′ R2i / I′ max2 ;

[0195] Among them, I′ p2i is the second peak Raman parameter set I′ of tobacco samples p2 The Raman parameter of the ith peak in R2i is the second Raman peak number set I′ R2 The i-th Raman peak in .

[0196] The number of Raman shifts selected on the first Raman spectrum curve segment is n, and the value of i is [1, n].

[0197] For the second Raman peak number set I′ R2 The second curve is integrated and summed to obtain a second area value A′2; the second Raman peak value set I′ R2 Each Raman peak in is divided by A′2 to obtain the second area Raman parameter number set I′ of the tobacco sample. o2 .

[0198] For example: I′ o2i =I′ R2i / A′2;

[0199] Among them, I′ o2i is the second area Raman parameter set I′ of tobacco samples o2 The i-th area Raman parameter in R2i is the second Raman peak number set I′ R2 The i-th Raman peak in .

[0200] The number of Raman shifts selected on the first Raman spectrum curve segment is n, and the value of i is [1, n].

[0201] The dimensionless parameter obtained by the above normalization is the first peak Raman parameter set I′ of the tobacco sample: p1 , the first area Raman parameter set I′ o1 , the second peak Raman parameter set I′ p2 and the second area Raman parameter set I′ o2 , in order to reduce the Raman intensity error caused by instrumental reasons.

[0202] S4: The dimensionless Raman parameter first peak Raman parameter set I′ obtained in step S3 p1 , the first area Raman parameter set I′ o1 , the second peak Raman parameter set I′ p2 and the second area Raman parameter set I′ o2 The thermal gravimetric characteristic curve obtained in step S1 is integrated as a database, and the sample name, dimensionless Raman parameter, and thermal gravimetric characteristic curve of each tobacco sample are associated, so that when one of the three data information of the tobacco sample is input, the other two data information can be output through the database.

[0203] S5: Obtain the Raman spectrum information of the tobacco sample to be tested according to the method of step S2, and obtain the dimensionless Raman parameters of the tobacco sample to be tested according to the method of step S3: the first peak Raman parameter number set I p1 , the first area Raman parameter set I o1 , the second peak Raman parameter set I p2 and the second area Raman parameter set I o2 ;

[0204] S6: performing difference calculations on the four dimensionless Raman parameters of the tobacco sample to be tested obtained in step S5 and the dimensionless Raman parameter data of tobacco samples with known thermogravimetric properties in the database respectively:

[0205] 1) According to the formula: Calculate and obtain m D 11 value, m D 11 The values ​​are sorted in order of size;

[0206] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first peak Raman parameter set I of the tobacco samples to be tested. p1 The number of the first peak Raman parameters, I p1i Represents the first peak Raman parameter set I of the tobacco sample to be tested p1 The i-th first peak Raman parameter in p1i The first peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p1 The i-th first peak Raman parameter in ;

[0207] In m D 11 Select the smallest D value 11 value, determine the minimum D 11 The values ​​correspond to the first known thermogravimetric properties of the tobacco sample.

[0208] 2) According to the formula: Calculate and obtain m D 12 value, m D 12 The values ​​are sorted in order of size;

[0209] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first area Raman parameter set I of the tobacco samples to be tested. o1 The number of the first area Raman parameters, I o1i Represents the first area Raman parameter set I of the tobacco sample to be tested o1 The i-th first area Raman parameter in o1i The first area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o1 The i-th first area Raman parameter in ;

[0210] In m D 12 Select the smallest D value 12 value, determine the minimum D 12 The value corresponds to a second tobacco sample of known thermogravimetric properties.

[0211] 3) According to the formula: Calculate and obtain m D 21 value, m D 21 The values ​​are sorted in order of size;

[0212] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second peak Raman parameter set I of the tobacco samples to be tested. p2 The number of the second peak Raman parameters, I p2i Represents the second peak Raman parameter set I of the tobacco sample to be tested p2 The i-th second peak Raman parameter in p2i The second peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p2 The i-th second peak Raman parameter in ;

[0213] In m D 21 Select the smallest D value 21 value, determine the minimum D 21 The values ​​correspond to the third known thermogravimetric property of the tobacco sample.

[0214] 4) According to the formula: Calculate and obtain m D 22 value, m D 22 The values ​​are sorted in order of size;

[0215] Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second area Raman parameter number set I of the tobacco samples to be tested. o2 The number of the second area Raman parameters, I o2i Represents the second area Raman parameter number set I of the tobacco sample to be tested o2 The i-th second area Raman parameter in o2i The second area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o2 The i-th second area Raman parameter in ;

[0216] In m D 22 Select the smallest D value 22 value, determine the minimum D 22 The values ​​correspond to the fourth known thermogravimetric property of the tobacco sample.

[0217] S7: Input the names of the first, second, third and fourth tobacco samples with known thermal gravimetric characteristics obtained in step S6 into the database of step S4, output the corresponding thermal gravimetric characteristic curves of the four tobacco samples, take the arithmetic mean of the four thermal gravimetric characteristic curves, which is the thermal gravimetric characteristic curve of the tobacco sample to be tested calculated by the method of the present invention, and then obtain the thermal gravimetric characteristics of the tobacco sample to be tested.

[0218] The present invention can quickly obtain the content of chemical components of various characteristics of tobacco by analyzing the Raman spectrum parameters of tobacco, and can associate the thermogravimetric curve through a certain mathematical model to solve the problem of time-consuming and cumbersome procedures in thermogravimetric detection of tobacco chemical components in actual industrial processes.

[0219] Based on the above-mentioned embodiments of the present disclosure, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0220] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A method for obtaining the thermal weight loss characteristics of tobacco, characterized in that: The following steps are involved: S10: testing the tobacco sample to be tested by using a Raman spectrometer to obtain a Raman spectrum curve of Raman shift-Raman intensity; S20: selecting a first Raman shift segment and a second Raman shift segment on the Raman spectrum curve, and obtaining a first Raman spectrum curve segment and a second Raman spectrum curve segment respectively; S30: connecting two end points of the first Raman spectrum curve segment to obtain a first straight line segment; connecting two end points of the second Raman spectrum curve segment to obtain a second straight line segment; S40: Obtaining a first Raman parameter number set I of the tobacco sample to be tested according to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment. op1 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second Raman parameter number set I of the tobacco sample to be tested is obtained. op2 ; S50: The first Raman parameter number set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare one by one, select the tobacco sample with known thermal gravimetric characteristics that is closest to the first Raman parameter number set of the tobacco sample to be tested, and obtain the first thermal gravimetric characteristic curve of the tobacco sample with known thermal gravimetric characteristics; op2 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Comparing one by one, selecting a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter number set of the tobacco sample to be tested, and obtaining a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics; S60: taking an average value of the data sets on the first thermogravimetric characteristic curve and the second thermogravimetric characteristic curve to obtain a thermogravimetric characteristic curve of the tobacco sample to be tested, and then obtaining the thermogravimetric characteristics of the tobacco sample to be tested.

2. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 1, characterized in that: In step S20, the Raman shift corresponding to the first Raman shift segment is 800 cm -1 ~1800cm -1 , and / or, the Raman shift corresponding to the second Raman shift segment is 2700cm -1 ~3500cm -1 .

3. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 1, characterized in that: In step S40, the first Raman parameter number set I of the tobacco sample to be tested op1 The first peak Raman parameter set I of the tobacco sample to be tested is included p1 According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first peak Raman parameter number set I of the tobacco sample to be tested is obtained. p1 The methods include: A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I R1 ; Select the first maximum peak I on the first Raman spectrum curve segment max1 ; The first Raman peak number set I R1 Each Raman peak in is divided by the first maximum peak I max1 , obtain the first peak Raman parameter set I of the tobacco sample to be tested p1 .

4. The method for obtaining the thermal weight loss characteristics of tobacco according to any one of claims 1 to 3, characterized in that: In step S40, the first Raman parameter number set I of the tobacco sample to be tested op1 A first area Raman parameter set I comprising a tobacco sample to be tested o1 According to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment, the first area Raman parameter number set I of the tobacco sample to be tested is obtained. o1 The methods include: A plurality of Raman shifts are selected on the first Raman spectrum curve segment, and the Raman intensity corresponding to the plurality of Raman shifts is subtracted from the Raman intensity corresponding to the corresponding Raman shift on the first straight line segment to obtain a first Raman peak value set I R1 , for the first Raman peak number set I R1 Integrate and sum the formed first curve to obtain a first area value A1; The first Raman peak number set I R1 Each Raman peak in is divided by the first area value A1 to obtain a first area Raman parameter number set I of the tobacco sample to be tested. o1 .

5. The method for obtaining the thermal weight loss characteristics of tobacco according to any one of claims 1 to 3, characterized in that: In the step S40, the second Raman parameter number set I of the tobacco sample to be tested op2 The second peak Raman parameter set I of the tobacco sample to be tested p2 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second peak Raman parameter number set I of the tobacco sample to be tested is obtained. p2 The methods include: A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensities corresponding to the plurality of Raman shifts are subtracted from the Raman intensities corresponding to the corresponding Raman shifts on the second straight line segment to obtain a second Raman peak value set I R2 ; Select the second maximum peak I on the second Raman spectrum curve segment max2 ; The second Raman peak number set I R2 Each Raman peak in is divided by the second largest peak I max2 , obtain the second peak Raman parameter set I of the tobacco sample to be tested p2 .

6. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 5, characterized in that: In the step S40, the second Raman parameter number set I of the tobacco sample to be tested op2 A second area Raman parameter set I comprising the tobacco sample to be tested o2 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second area Raman parameter number set I of the tobacco sample to be tested is obtained. o2 The methods include: A plurality of Raman shifts are selected on the second Raman spectrum curve segment, and the Raman intensities corresponding to the plurality of Raman shifts are subtracted from the Raman intensities corresponding to the corresponding Raman shifts on the second straight line segment to obtain a second Raman peak value set I R2 , for the second Raman peak number set I R2 Integrate and sum the formed second curve to obtain a second area value A2; The second Raman peak number set I R2 Each Raman peak in is divided by the second area value A2 to obtain a second area Raman parameter number set I of the tobacco sample to be tested. o2 .

7. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 3, characterized in that: In step 50, the first Raman parameter number set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare them one by one, including: The first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 Including the first peak Raman parameter set I' p1 ; According to the formula: Calculate and obtain m D 11 value, m D 11 The values ​​are sorted in order of size; Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first peak Raman parameter set I of the tobacco samples to be tested. p1 The number of the first peak Raman parameters, I p1i Represents the first peak Raman parameter set I of the tobacco sample to be tested p1 The i-th first peak Raman parameter in p1i The first peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p1 The Raman parameter of the i-th first peak in .

8. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 7, characterized in that: In the step S50, a tobacco sample with known thermogravimetric characteristics that is closest to the first Raman parameter number set of the tobacco sample to be tested is selected to obtain a first thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics, including: In m D 11 Select the smallest D value 11 value, determine the minimum D 11 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the first thermal gravimetric characteristic curve of the tobacco sample to be tested.

9. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 4, characterized in that: In step 50, the first Raman parameter number set I of the tobacco sample to be tested is op1 The first Raman parameter number set I′ located in the first Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op1 Compare them one by one, including: The first Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the first Raman shift segment op1 Including the first area Raman parameter set I' o1 ; According to the formula: Calculate and obtain m D 12 value, m D 12 The values ​​are sorted in order of size; Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the first area Raman parameter set I of the tobacco samples to be tested. o1 The number of the first area Raman parameters, I o1i Represents the first area Raman parameter set I of the tobacco sample to be tested o1 The i-th first area Raman parameter in o1i The first area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o1 The i-th first area Raman parameter in .

10. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 9, characterized in that: In the step S50, a tobacco sample with known thermogravimetric characteristics that is closest to the first Raman parameter number set of the tobacco sample to be tested is selected to obtain a first thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics, including: In m D 12 Select the smallest D value 12 value, determine the minimum D 12 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the first thermal gravimetric characteristic curve of the tobacco sample to be tested.

11. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 5, characterized in that: In step 50, the second Raman parameter number set I of the tobacco sample to be tested is op1 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Compare them one by one, including: The second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift section op2 Including the second peak Raman parameter set I' p2 ; According to the formula: Calculate and obtain m D 21 value, m D 21 The values ​​are sorted in order of size; Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second peak Raman parameter set I of the tobacco samples to be tested. p2 The number of the second peak Raman parameters, I p2i Represents the second peak Raman parameter set I of the tobacco sample to be tested p2 The i-th second peak Raman parameter in p2i The second peak Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties p2 The Raman parameter of the i-th second peak in .

12. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 11, characterized in that: In step S50, a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter number set of the tobacco sample to be tested is selected to obtain a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics, including: In m D 21 Select the smallest D value 21 value, determine the minimum D 21 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the second thermal gravimetric characteristic curve of the tobacco sample to be tested.

13. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 6, characterized in that: In step 50, the second Raman parameter number set I of the tobacco sample to be tested is op2 The second Raman parameter number set I′ located in the second Raman shift section of a plurality of tobacco samples with known thermogravimetric properties is respectively op2 Compare them one by one, including: The second Raman parameter number set I′ of the tobacco sample with known thermogravimetric characteristics located in the second Raman shift section op2 Including the second area Raman parameter set I' o2 ; According to the formula: Calculate and obtain m D 22 value, m D 22 The values ​​are sorted in order of size; Wherein, m represents the number of tobacco samples with known thermogravimetric properties, and n represents the second area Raman parameter number set I of the tobacco samples to be tested. o2 The number of the second area Raman parameters, I o2i Represents the second area Raman parameter number set I of the tobacco sample to be tested o2 The i-th second area Raman parameter in o2i The second area Raman parameter set I′ representing the tobacco sample with known thermogravimetric properties o2 The i-th second area Raman parameter in .

14. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 13, characterized in that: In step S50, a tobacco sample with known thermogravimetric characteristics that is closest to the second Raman parameter number set of the tobacco sample to be tested is selected to obtain a second thermogravimetric characteristic curve of the tobacco sample with known thermogravimetric characteristics, including: In m D 22 Select the smallest D value 22 value, determine the minimum D 22 The value corresponds to a tobacco sample with known thermal gravimetric characteristics, and the thermal gravimetric characteristic curve corresponding to the tobacco sample with known thermal gravimetric characteristics is the second thermal gravimetric characteristic curve of the tobacco sample to be tested.

15. The method for obtaining the thermal weight loss characteristics of tobacco according to claim 1, characterized in that: In step S50, the first Raman parameter set I′ of the tobacco sample with known thermogravimetric characteristics located in the first Raman shift segment op1 , and the second Raman parameter number set I′ of the tobacco sample with known thermogravimetric properties located in the second Raman shift segment op2 The methods for obtaining include: S100: testing the tobacco sample using a Raman spectrometer to obtain a Raman spectrum curve of Raman shift-Raman intensity; S200: selecting a first Raman shift segment and a second Raman shift segment on the Raman spectrum curve, and obtaining a first Raman spectrum curve segment and a second Raman spectrum curve segment respectively; S300: connecting two end points of the first Raman spectrum curve segment to obtain a first straight line segment; connecting two end points of the second Raman spectrum curve segment to obtain a second straight line segment; S400: Obtaining a first Raman parameter number set I′ of the tobacco sample according to the difference information of the Raman intensity between the point set on the first Raman spectrum curve segment and the corresponding point set on the first straight line segment op1 According to the difference information of the Raman intensity between the point set on the second Raman spectrum curve segment and the corresponding point set on the second straight line segment, the second Raman parameter number set I′ of the tobacco sample is obtained. op2 .

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