Susceptor for an aerosol-generating device, aerosol-generating device

Abstract

This invention proposes an aerosol generating device and a sensor for the aerosol generating device. The sensor includes an electrically insulating substrate extending at least partially into a cavity, a sensing material layer formed on the electrically insulating substrate, and a conductive track that conducts heat to the sensing material layer. The sensing material layer can be penetrated by a changing magnetic field and generate heat, thereby heating the suction material. The conductive track has a positive or negative temperature coefficient of resistance, and the temperature of the sensing material layer can be determined by measuring the resistance value of the conductive track and from the resistance value. The above aerosol generating device and sensor, using an electrically insulating substrate as a carrier, form a sensing material layer that can be induced to generate heat by a magnetic field, and a conductive track with a suitable temperature coefficient of resistance. While responding to the magnetic field to heat the suction material, the temperature of the sensor can be accurately detected. Compared with temperature sensors, this method is more convenient to manufacture and more accurate in temperature measurement.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic induction heating non-combustible smoke appliances, and particularly to a sensor for an aerosol generating device and an aerosol generating device. Background Technology

[0002] Tobacco products (such as cigarettes, cigars, etc.) produce tobacco smoke by burning tobacco during use. Efforts are being made to replace these tobacco-burning products by creating products that release compounds without combustion.

[0003] Examples of such products are heating devices that release compounds by heating rather than burning a material. This material could be, for example, tobacco or other non-tobacco products, which may or may not contain nicotine. In known devices, temperature monitoring during the heating process of the tobacco product is required; examples of such products use temperature sensors attached to the heating element to obtain the temperature of the heating element. Summary of the Invention

[0004] To address the temperature monitoring problem in existing tobacco product heating devices, this invention provides an electromagnetic induction-based aerosol generator that is easy to manufacture and accurately detects temperature.

[0005] This invention proposes an aerosol generating device configured to heat an extractable material to generate an aerosol, comprising:

[0006] A chamber for receiving at least a portion of the suctionable material;

[0007] A magnetic field generator, configured to produce a changing magnetic field;

[0008] A sensor includes an electrically insulating substrate extending at least partially into the cavity, a sensing material layer formed on the electrically insulating substrate, and a conductive trace thermally conductive to the sensing material layer; wherein the sensing material layer is configured to be penetrated by the changing magnetic field and heated, thereby heating at least a portion of a removable material received in the cavity; the conductive trace has a positive or negative temperature coefficient of resistance, such that the temperature of the sensing material layer can be determined by measuring the resistance value of the conductive trace and from the resistance value.

[0009] In a preferred embodiment, the sensing material layer is formed on the electrically insulating substrate by deposition, spraying, winding, or wrapping.

[0010] In a preferred embodiment, the sensing material layer has a thickness of less than 0.2 mm.

[0011] In a preferred embodiment, the sensing material layer comprises a metal or alloy.

[0012] In a preferred embodiment, the conductive trace is configured to be located outside the sensing material layer.

[0013] In a preferred embodiment, the conductive trace is formed between the electrically insulating substrate and the sensing material layer.

[0014] In a preferred embodiment, the sensing material layer is configured as a tubular structure extending along the length of the electrically insulating substrate and surrounding the electrically insulating substrate.

[0015] In a preferred embodiment, the conductive trace is configured to be located within a generally magnetically shielded region formed within the sensing material layer.

[0016] In a preferred embodiment, the conductive trajectory is configured as a spiral extending along the length of the electrically insulating substrate.

[0017] In a preferred embodiment, the sensing material layer and the conductive trace are mutually insulated.

[0018] In a preferred embodiment, the receptor may have an outer protective layer, such as a ceramic or glass protective layer encapsulating the receptor. The receptor may include a protective coating formed of glass, ceramic, or inert metal, which is formed on the core of the receptor material.

[0019] In a preferred embodiment, the sensor further includes electrical connection portions disposed at both ends of the conductive trajectory, through which the resistance value of the conductive trajectory can be measured during use.

[0020] In a preferred embodiment, the electrical connection includes elongated conductive pins.

[0021] In a preferred embodiment, the conductive trace includes a first portion and a second portion, wherein the first portion has a higher temperature coefficient of resistance than the second portion;

[0022] The electrical connection portion is connected to the conductive trace via the second part.

[0023] In a preferred embodiment, the magnetic field generator includes an inductor coil extending axially along the cavity and surrounding the cavity;

[0024] The length of the inductor coil extending along the axial direction of the chamber covers the length of the sensing material layer extending along the axial direction of the chamber.

[0025] In a preferred embodiment, the electrically insulating substrate comprises ceramic.

[0026] In a preferred embodiment, the sensor further includes a base portion through which the aerosol generating device holds the sensor.

[0027] In a preferred embodiment, the sensing material layer and the base portion are non-contact.

[0028] In a preferred embodiment, a certain distance is maintained between the sensing material layer and the base portion to form a retaining area;

[0029] The aerosol generating device includes a support for holding the receptor, the support being connected to the holding area and at least partially surrounding the base portion to provide holding for the receptor.

[0030] In a preferred embodiment, the aerosol generating device further includes a support for holding the sensor, the support being in contact with the sensing material layer.

[0031] In a preferred embodiment, the sensing material layer is a hollow pin or tube fitted over the electrically insulating substrate.

[0032] In a preferred embodiment, the sensing material layer completely covers the conductive trace.

[0033] In a preferred embodiment, the electrically insulating substrate is configured as a blade extending axially along the cavity and has a first surface and a second surface opposite to each other in the thickness direction.

[0034] The sensing material layer is formed on the first surface, and the conductive trace is formed on the second surface.

[0035] The present invention also proposes a sensor for an aerosol generating device, comprising:

[0036] An electrically insulating substrate, a sensing material layer formed on the electrically insulating substrate, and a thermally conductive trace connected to the sensing material layer; wherein...

[0037] The sensing material layer is configured to be penetrated by a changing magnetic field and generate heat; the conductive trace has a positive or negative temperature coefficient of resistance, so that the temperature of the sensing material layer can be determined by measuring the resistance value of the conductive trace and from the resistance value.

[0038] The above-mentioned aerosol generating device and sensor use an electrically insulating substrate as a carrier, on which a sensing material layer that can be induced to heat by a magnetic field and a conductive trajectory with a suitable temperature coefficient of resistance are formed. While responding to the magnetic field to heat the suction material, the temperature of the sensor can be accurately detected. Compared with the temperature sensor, the temperature measurement method is more convenient to produce and more accurate. Attached Figure Description

[0039] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0040] Figure 1 This is a schematic diagram of the structure of an aerosol generating device provided in one embodiment;

[0041] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the central support;

[0042] Figure 3 yes Figure 1 A schematic diagram of the three-dimensional structure of the mesoreceptor from a single perspective;

[0043] Figure 4 This is a curve showing the resistance of a conductive trace as a function of temperature in one embodiment.

[0044] Figure 5 This is a schematic diagram of the steps in a method for preparing a receptor according to one embodiment;

[0045] Figure 6 yes Figure 5 A schematic diagram of the method for forming conductive traces on ceramic green bodies;

[0046] Figure 7 yes Figure 5 A schematic diagram of an electrically insulating substrate with conductive traces prepared by the method;

[0047] Figure 8 This is a schematic diagram of forming a sensor by placing a hollow metal tube on an electrically insulating substrate;

[0048] Figure 9 This is a schematic diagram of the sensor structure in yet another embodiment. Detailed Implementation

[0049] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0050] One embodiment of the present invention provides an aerosol generating device, the structure of which can be found in [reference needed]. Figure 1 As shown, it includes:

[0051] The chamber contains removable aspirable material A.

[0052] An inductor L is used to generate a changing magnetic field under alternating current;

[0053] The sensor 30, at least a portion of which extends within the chamber, is configured to be inductively coupled to the inductor coil L. It heats up when penetrated by a changing magnetic field, thereby heating the smokeable material A, such as a cigarette, causing at least one component of the smokeable material A to volatilize and form an aerosol for inhalation.

[0054] Cell 10 is a rechargeable DC cell that can output DC current;

[0055] Circuit 20, connected by appropriate electrical connection to rechargeable cell 10, is used to convert the direct current output from cell 10 into an alternating current with a suitable frequency for supplying to inductor L.

[0056] Depending on the configuration used in the product, the inductor coil L may include a cylindrical inductor coil wound in a helical shape, such as... Figure 1 As shown in the diagram, the cylindrical inductor L wound in a helical shape can have a radius r ranging from approximately 5 mm to approximately 10 mm, and particularly, the radius r can be approximately 7 mm. The length of the cylindrical inductor L wound in a helical shape can range from approximately 8 mm to approximately 14 mm, and the number of turns of the inductor L ranges from approximately 8 to 15 turns. Accordingly, the internal volume may be approximately 0.15 cm³. 3 Up to approximately 1.10cm 3 Within the range.

[0057] In a more preferred embodiment, the frequency of the alternating current supplied by circuit 20 to inductor L is between 80 kHz and 400 kHz; more specifically, the frequency can be in the range of approximately 200 kHz to 300 kHz.

[0058] In a preferred embodiment, the DC supply voltage provided by the battery cell 10 is in the range of about 2.5V to about 9.0V, and the DC current provided by the battery cell 10 is in the range of about 2.5A to about 20A.

[0059] In a preferred embodiment, the receptor 30 may have a length of approximately 12 mm, a width of approximately 4 mm, and a thickness of approximately 50 micrometers, and may be made of grade 430 stainless steel (SS430). As an alternative embodiment, the receptor 30 may have a length of approximately 12 mm, a width of approximately 5 mm, and a thickness of approximately 50 micrometers, and may also be made of grade 430 stainless steel (SS430). In yet another preferred embodiment, the receptor 30 may also be configured in a cylindrical shape; in use, its internal space is used to receive aspirable material A, and by heating the outer periphery of the aspirable material A, an inhalable aerosol is generated. These receptors may also be made of grade 420 stainless steel (SS420), as well as iron-nickel alloys (such as permalloy).

[0060] exist Figure 1 In the illustrated embodiment, the aerosol generating device further includes a tubular support 50 for arranging the inductor coil L and the sensor 30. The tubular support 50 may be made of a high-temperature resistant non-metallic material such as PEEK or ceramic. In practice, the inductor coil L is wound around the outer wall of the tubular support 50.

[0061] Based on the improved flexibility in convenient installation, replacement, and cleaning of the sensor 30, see further details. Figure 2 As shown, the tubular support 50 has a partition 51 with an inner diameter that is relatively smaller than the inner diameter of the tubular support 50, which is arranged in the radial direction. The partition 51 divides the space inside the tubular support 50 into two parts, namely a first receiving part 510 and a second receiving part 520. According to this structure, the first receiving part 510 is configured to receive the aforementioned chamber of the suction material A. When the suction material A is received in the first receiving part 510, its front end abuts against the partition 51 to achieve support and retention, and to provide a stop for the suction material A.

[0062] The sensor 30 is structurally adjusted accordingly, including a pin- or blade-shaped heating portion 31 extending axially within the first receiving portion 510. When the absorbable material A is received within the first receiving portion 510, the heating portion 31 can be inserted into the absorbable material A to heat its interior. Simultaneously, the sensor 30 also includes a base portion 32 received within the second receiving portion 520. The shape of the base portion 32 is adapted to the second receiving portion 520 for tight contact. The base portion 32 facilitates the installation and fixation of the sensor 30, allowing it to be held relatively easily within the second receiving portion 520. According to this embodiment, the partition portion 51 has a through hole 511 through which the heating portion 31 passes, allowing one end of the heating portion 31 to connect to the base portion 32 and the other end to extend into the first receiving portion 510.

[0063] In a preferred embodiment, the base portion 32 is made of a ceramic or insulating material with low thermal conductivity, such as zirconia ceramic, which can effectively reduce the transfer of heat from the sensor 30 to the support 50.

[0064] In a preferred embodiment, in order to accurately monitor the temperature of the sensor 30 and control it to minimize heat loss to components in contact with it during installation; see the detailed construction of the sensor 30 for details. Figure 3 As shown, the heating section 31 includes:

[0065] Electrically insulating substrate 311, in Figure 3The middle part is constructed in the shape of a pin or blade that can be inserted into the suction material A; in practice, the electrically insulating substrate 311 can be integrally prepared with the base part 32, and the material can be alumina, zirconia ceramic, rigid heat-resistant polymer resin, or metal substrate after insulation treatment, etc.

[0066] A sensing material layer 312 is deposited, sprayed, or bonded to the outside of an electrically insulating substrate 311 by means of winding or wrapping. In an optional embodiment, the sensing material layer 312 is a coating formed on the electrically insulating substrate 311 by means of PVD deposition or plasma spraying. The material of the sensing material layer 312 can be an induction heating metal or alloy material with appropriate magnetic permeability, so that it can be induced to heat by the magnetic field generated by the inductor coil L. In the embodiment, the thickness of the sensing material layer 312 can preferably be less than 0.2 mm or even thinner. For example, when a material with excellent magnetic permeability, such as permalloy, is used, it can be achieved that the skin effect thickness is greater than 2.8 micrometers.

[0067] In a further preferred embodiment, the extension length of the sensing material layer 312 on the electrically insulating substrate 311 is covered by the length of the inductor coil L, which serves as the magnetic field generator; that is, the sensing material layer 312 is essentially entirely located within the inductor coil L. Furthermore, the length of the sensing material layer 312 completely covers the conductive trace 313, resulting in greater uniformity.

[0068] A conductive trace 313, further thermally connected to the sensing material layer 312, has a positive or negative temperature coefficient of resistance and is coupled to the circuit 20 via a conductive pin 314. In use, the circuit 20 can calculate the resistance of the conductive trace 313 by sampling the voltage and current across it. In the heating section 31 of the above structure, when the sensing material layer 312 generates heat, the heat can be directly transferred from the sensing material layer 312 to the conductive trace 313, making their temperatures equal or nearly equal. The resistance of the conductive trace 313 changes accordingly with temperature variations, allowing the temperature of the sensing material layer 312 to be obtained by measuring the resistance of the conductive trace 40. In implementation, the circuit 20 may include an amplifier, comparator, MCU with voltage or current sampling function, or a meter electrically coupled to the conductive trace 313 to measure its resistance.

[0069] The conductive trace 313 described above is preferably formed of a metallic material having a suitable temperature coefficient of resistance, the metal possessing suitable inherent material properties for providing a linear approximation of resistance as a function of temperature. In preferred embodiments, examples of suitable metals include platinum (Pt), titanium (Ti), copper (Cu), nickel (Ni), or various alloys containing them. In other variant embodiments, the conductive trace 313 may also be formed of any other metal having a relatively large temperature coefficient of resistance (α) and exhibiting no significant fluctuations as a function of temperature. Figure 4 A graph showing the resistance of a conductive trajectory 313 with a positive temperature coefficient of resistance, prepared by screen printing from a platinum-nickel-chromium alloy in one embodiment, is illustrated.

[0070] In other variations, the conductive traces 313 are patterned conductive traces with shapes formed by methods such as printing, etching, and electroplating. In a preferred embodiment, the patterned conductive traces 313 can be geometric patterns such as meandering, bending, or spiraling. For example... Figure 3 In the preferred embodiment shown, the conductive trace 313 is configured as a spiral shape that surrounds the electrically insulating substrate 311 and / or the sensing material layer 312 and extends along the axial direction of the electrically insulating substrate 311 and / or the sensing material layer 312.

[0071] Of course, in the above implementation, the conductive trace 313 and the sensing material layer 312 are mutually insulated to prevent interference when the circuit 20 measures the resistance of the conductive trace 313. Specifically, this can be achieved by setting an insulating layer (not shown in the figure) between the conductive trace 313 and the sensing material layer 312. For example, during the preparation process, a relatively thin insulating protective layer such as glass / glaze is first deposited or sprayed onto the surface of the sensing material layer 312, and then the conductive trace 313 is formed.

[0072] In yet another preferred embodiment, the conductive trace 313 is formed between the electrically insulating substrate 311 and the sensing material layer 312, i.e., the sensing material layer 312 is located outside the conductive trace 313. In use, by placing the sensing material layer 312 outside the conductive trace 313, the inner region of the sensing material layer 312 in the radial direction is approximately a magnetically shielded region, and the conductive trace 313, being within this magnetically shielded region, is not induced to generate current by the alternating magnetic field, thus preventing interference with its resistance measurement.

[0073] Furthermore, to prevent wear and tear on the sensor 30 during use, a protective film can be formed on the outermost surface of the heating part 31 by means of spraying, sputtering, deposition, etc. The material of the protective film can be glass, ceramic, glaze, etc., and the thickness is controlled to be about 1 to 50 μm.

[0074] In another alternative implementation, the sensing material layer 312 is applied as a metal foil to the outer surface of the electrically insulating substrate 311.

[0075] Further based on Figure 3 In the preferred embodiment shown, the sensing material layer 312 maintains a certain distance from the base portion 32 along the axial direction of the sensor 30, forming a holding region 315. During use, the partition portion 51 of the bracket 50 is held or connected to this holding region 315, and after assembly, the sensing material layer 312 and the partition portion 51 of the bracket 50 are relatively offset and do not contact each other; thereby preventing the heat of the sensing material layer 312 from being transferred to the partition portion 51 of the bracket 50 through contact.

[0076] Another embodiment of the present invention also proposes a method for preparing a sensor 30 for an aerosol generating device, which specifically includes the following steps, see below. Figures 5 to 7 As shown:

[0077] S10, to obtain a thin sheet of ceramic green body 3131, which can be a flexible alumina or zirconium oxide ceramic paper that is purchased directly;

[0078] S20, such as Figure 6 As shown, conductive traces 313 are formed on the flat surface of a thin ceramic green body 3131 by means of printing, deposition, or printing. Of course, in order to facilitate the subsequent welding of conductive pins 314 to conductive traces 313, low-resistivity electrical connection portions 3132 are formed at both ends of conductive traces 313. The material of electrical connection portions 3132 can be silver, gold, silver-palladium alloy, etc., with low resistance coefficients.

[0079] In an optional implementation, the thickness of the printed conductive traces 313 is approximately 10 to 30 micrometers.

[0080] S30, obtain Figure 3 A dowel-shaped electrically insulating ceramic substrate 311 is formed by winding a thin ceramic green film 3131 with conductive traces 313 prepared in step S20 onto the surface of the dowel-shaped electrically insulating substrate 311, and then forming an integral structure by isostatic pressing or sintering. Figure 7 The electrically insulating substrate 311 shown has conductive traces 313; depending on the implementation, conductive pins 314 may also be soldered to both ends of the electrical connection portion 3132.

[0081] In step S40, a metal foil for forming the sensing material layer 312 is obtained and wound onto the surface of the electrically insulating substrate 311 with conductive traces 313 after curing in step S30 using a winding process. Then, the wound metal foil is welded together at the seam using a welding process, so that the metal foil is firmly bonded to the surface of the electrically insulating substrate 311 during the welding process, forming a tubular sensing material layer 312. After completion, a protective layer can be sprayed onto the surface, etc., to obtain the sensor 30 for the aerosol generating device.

[0082] In yet another variation, the method for preparing the sensing material layer 312 can also be as follows: Figure 8 The procedure is as shown, specifically:

[0083] Step S40a: A hollow metal tube 312a with an inner diameter slightly smaller than the outer diameter of the electrically insulating substrate 311 is heated to the highest temperature used in the product (e.g., greater than 350°C), causing the metal tube 312a to expand and be fitted onto the surface of the electrically insulating substrate 311 with conductive traces 313; after cooling, the hollow metal tube 312a is fastened to the surface of the electrically insulating substrate 311, forming a sensing material layer 312 that is in close thermal contact with the conductive traces 313.

[0084] Alternatively, in other variations, the hollow metal tube 312a used in step S40a above can be replaced with a hollow needle or pin.

[0085] Or see another variable implementation. Figure 9 As shown, the sensor 30b includes a blade-shaped electrically insulating substrate 311b; the electrically insulating substrate 311b has two surfaces opposite each other along the thickness direction, i.e. Figure 9 The electrically insulating substrate 311b has an upper and a lower surface; the upper surface has a conductive trace 313b for sensing the temperature of the sensor 30b, while the lower surface has a sensing material layer 312b. In this embodiment, the electrically insulating substrate 311b can be made of a material with relatively high thermal conductivity, so that the overall temperature tends to be uniform, the heat transfer with the extractable material A is kept approximately uniform during the heating process, and the temperature measurement error of the conductive trace 313b is reduced.

[0086] The above-mentioned aerosol generating device and sensor use an electrically insulating substrate as a carrier, on which a sensing material layer that can be induced to heat by a magnetic field and a conductive trajectory with a suitable temperature coefficient of resistance are formed. While responding to the magnetic field to heat the suction material, the temperature of the sensor can be accurately detected. Compared with the temperature sensor, the temperature measurement method is more convenient to produce and more accurate.

[0087] It should be noted that the preferred embodiments of the present invention are given in the specification and accompanying drawings, but are not limited to the embodiments described in this specification. Furthermore, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An aerosol generating device, configured to heat an absorbent material to generate an aerosol, characterized in that, include: A chamber for receiving at least a portion of the suctionable material; A magnetic field generator, configured to produce a changing magnetic field; A sensor includes an electrically insulating substrate extending at least partially into a cavity, a sensing material layer formed on the electrically insulating substrate, and a conductive track thermally conductive to the sensing material layer; wherein the sensing material layer is configured to be penetrated by the changing magnetic field and heated, thereby heating at least a portion of a removable material received in the cavity; the conductive track is formed between the electrically insulating substrate and the sensing material layer, and the conductive track has a positive or negative temperature coefficient of resistance, such that the temperature of the sensing material layer can be determined by measuring the resistance value of the conductive track and from the resistance value; the sensing material layer is configured to extend along the length of the electrically insulating substrate and be tubular around the electrically insulating substrate, and the conductive track is configured to be located within a magnetic field shielded region formed within the sensing material layer; The sensor also includes a base portion through which the aerosol generating device holds the sensor; the sensing material layer is non-contact with the base portion, and there is a gap between the sensing material layer and the base portion, forming a holding area by the gap; A support is provided for holding the receptor; the support is connected to the holding area and at least partially surrounds the base portion to provide holding for the receptor, and the support is not in contact with the sensing material layer.

2. The aerosol generating device as described in claim 1, characterized in that, The sensing material layer is formed on the electrically insulating substrate by deposition, spraying, winding, or wrapping.

3. The aerosol generating device as described in claim 1, characterized in that, The sensing material layer has a thickness of less than 0.2 mm.

4. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The sensing material layer comprises metal.

5. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The conductive trajectory is configured as a spiral extending along the length of the electrically insulating substrate.

6. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The sensing material layer and the conductive trace are mutually insulated.

7. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The receptor has an outer protective layer.

8. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The sensor also includes electrical connection portions disposed at both ends of the conductive trajectory, through which the resistance value of the conductive trajectory can be measured during use.

9. The aerosol generating device as described in claim 8, characterized in that, The electrical connection includes elongated conductive pins.

10. The aerosol generating device as described in claim 8, characterized in that, The conductive trace includes a first part and a second part, and the first part has a higher temperature coefficient of resistance than the second part. The electrical connection portion is connected to the conductive trace via the second part.

11. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The magnetic field generator includes an inductor coil extending axially along the cavity and surrounding the cavity; The length of the inductor coil extending along the axial direction of the chamber covers the length of the sensing material layer extending along the axial direction of the chamber.

12. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The electrically insulating substrate comprises ceramic.

13. The aerosol generating device as described in claim 1, characterized in that, The sensing material layer is a hollow pin or tube fitted over the electrically insulating substrate.

14. The aerosol generating apparatus according to any one of claims 1 to 3, characterized in that, The sensing material layer completely covers the conductive trajectory.

15. A sensor for an aerosol generating device, characterized in that, include: An electrically insulating substrate, a sensing material layer formed on the electrically insulating substrate, and a thermally conductive trace connected to the sensing material layer; wherein... The sensing material layer is configured to be penetrated by a changing magnetic field and generate heat; the conductive trace is formed between the electrically insulating substrate and the sensing material layer, and the conductive trace has a positive or negative temperature coefficient of resistance, so that the temperature of the sensing material layer can be determined by measuring the resistance value of the conductive trace and from the resistance value. The sensing material layer is configured as a tube extending along the length of the electrically insulating substrate and surrounding the electrically insulating substrate, and the conductive trajectory is configured to be located within a region shielded by a magnetic field formed within the sensing material layer. The sensor also includes a base portion, the sensing material layer is non-contact with the base portion, and there is a gap between the sensing material layer and the base portion, forming a holding area by the gap.

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