KR20180024295A - Sensor for detecting environmental change information of internal packaging and package inspection apparatus using the same - Google Patents

Abstract

The present invention relates to a sensor for sensing environmental change information inside wrapping paper, and to an apparatus for inspecting the wrapping paper using the same. To this end, the present invention includes: an electric field strengthening structure installed inside wrapping paper and configured to reinforce an electric field in response to a preset frequency band of electromagnetic waves; and a sensing layer applied onto the electric field strengthening structure and formed to change a state thereof in accordance with an environmental change inside the wrapping paper.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor for detecting environmental change information inside a wrapping paper, and a device for inspecting a wrapping paper using the sensor.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sensor for sensing environmental change information inside a wrapping paper, and an apparatus for inspecting a wrapping paper using the same.

In general, wrapping paper is a means for protecting and packaging the contents contained therein, and the kind thereof is different according to the type of contents.

The contents accommodated in such a wrapping paper may be changed in accordance with a change in environment inside the wrapping paper. Especially, contents such as groceries are highly likely to change due to environmental changes. However, since most of the products are provided with the contents inside the wrapping paper which is a sealed state of the opaque material, it is difficult to identify the altered state of the contents inside from the outside.

Accordingly, there is a need for an apparatus and method for easily detecting a change in the state of contents without opening the wrapping paper at each distribution stage and providing a normal product to the end consumer.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sensor capable of easily detecting environmental changes inside a wrapping paper at low cost and an apparatus for inspecting a wrapping paper using the same

According to an embodiment of the present invention, there is provided a sensor for sensing environmental change information in a wrapping paper, comprising: an electric field reinforcing structure installed inside a wrapping paper to reinforce an electric field in response to a predetermined frequency band of electromagnetic waves; And a sensing layer formed on the electric field enhancing structure so as to change a state according to an environmental change in the packaging sheet.

Here, the sensing layer may convert the incident first electromagnetic wave into a second electromagnetic wave corresponding to the state change when the state change occurs.

Here, at least one of frequency information, reflectivity information, and Q-factor information of the first electromagnetic wave may be changed according to the change of the state of the second electromagnetic wave.

Here, the sensing layer may include a temperature strain material that undergoes a physical change according to a temperature change.

Here, the temperature-modifying substance may be selected from the group consisting of paraffin wax, polyolefin wax, thermoplastic resin, polystyrene, methacrylic resin, polyethylene, natural fat (Natural Fat), and oil (oil).

Here, the sensing layer may include a moisture deformation material that undergoes a physical change in response to a change in humidity.

Here, the moisture modifying material may include at least one of Methacrylic Acid Hydroxyalkyl, Polymethacryl Amide, Polyvinyl Alcohol, and Hydrogel. .

Here, the sensing layer may sense information on the internal environment change of the wrapping paper including a pressure-deforming material that is physically changed in accordance with the pressure change.

Here, the base further includes a base layer formed to be attached to the inside of the package, and the electric field enhancing structure may be disposed on the base layer.

Here, the electric field enhancing structure may be formed to have a first refractive index, and the base layer may be formed to have a second refractive index that is smaller than the first refractive index.

Here, the electric field reinforcing structure may be arranged such that protrusions protruding in one direction and recesses formed in the other direction are alternately and continuously arranged.

Here, the electric field enhancing structure may be at least one of a diffraction grating, a metal mesh, a metamaterial, a metal layer including an opening having a width less than the wavelength of the light source, a structure for inducing surface plasmon resonance, and a photonic crystal structure have.

According to another aspect of the present invention, there is provided an apparatus for inspecting a wrapping paper according to another embodiment of the present invention, comprising: an electric field reinforcing structure provided inside a wrapping paper to reinforce an electric field in response to a predetermined frequency band of electromagnetic waves; A sensor having a sensing layer for changing a state according to a change in environment inside the wrapping paper; A light source for irradiating the first electromagnetic wave with the sensor; A detector for detecting a second electromagnetic wave generated from the sensor; And a recognition unit for generating environmental change information on the environmental change inside the wrapping paper based on the second electromagnetic wave detected by the detection unit.

Here, the sensing layer may include a temperature deformation material that undergoes a physical change in response to a temperature change, and the temperature deformation material may include paraffin wax, polyolefin wax, thermoplastic resin, And may include at least one of polystyrene, methacrylic resin, polyethylene, natural fat, and oil.

Here, the sensing layer may include a moisture modifying material that undergoes a physical change in response to a change in humidity, and the moisture modifying material may be selected from the group consisting of Methacrylic Acid Hydroxyalkyl, Polymethacryl Amide, Vinyl alcohol, polyvinyl alcohol, and hydrogel.

Here, the sensing layer may include a pressure-strain material that undergoes a physical change in response to a pressure change.

Here, the recognizing unit may generate at least one of the frequency information, the reflectivity information, and the Q-factor information of the first electromagnetic wave and the second electromagnetic wave to generate the environment change information

A display unit configured to output the environmental change information as image information; And a speaker unit configured to output the environment change information as voice information.

According to the sensor for detecting the environmental change information in the wrapping paper and the wrapping paper inspecting apparatus using the same, the environmental change inside the wrapping paper can be easily detected.

In addition, by changing the electromagnetic waves reflected according to the structure converted by the environment change, it is possible to realize a low-cost sensor having a simple structure by not including the configuration (power source, memory, communication unit, etc.) of general sensors electrically driven .

In addition, by configuring the sensor with materials that respond to environmental changes, such as temperature, humidity, and pressure, various environmental changes can be detected.

1 is a cross-sectional view illustrating a hierarchical structure of a sensor 100 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a flexure sensor 100 'according to another embodiment of the present invention.
3 is a conceptual diagram illustrating a structure and an operation method of the wrapping paper inspecting apparatus 200 according to another embodiment of the present invention.
4A to 4C are diagrams for explaining the property change of the second electromagnetic wave according to the change of the environment.
5 is a conceptual diagram for explaining a method of sensing humidity information inside the wrapping paper P through the sensor 100 and the package inspecting apparatus 200. FIG.
6 is a conceptual diagram for explaining a method of sensing pressure information inside the wrapping paper P through the sensor 100 and the package inspecting apparatus 200. As shown in FIG.
7A and 7B are conceptual diagrams for explaining a method of sensing temperature information inside the wrapping paper P 'through the sensor 100 and the wrapping paper inspecting apparatus 200. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sensor for detecting environmental change information in a wrapping paper according to a preferred embodiment of the present invention and an apparatus for inspecting a wrapping paper using the sensor will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations.

1 is a cross-sectional view illustrating a hierarchical structure of a sensor 100 according to an embodiment of the present invention.

As shown, the sensor 100 may include a base layer 110, an electric field enhancing structure 130, and a sensing layer 150.

The base layer 110 may be formed on one surface of the sensor 100 as a means for attaching to an object such as a wrapping paper (not shown in Fig. Here, the sensor 100 may be attached to the inner surface of the object, but may be inserted between the inner surface and the outer surface of the object. When disposed between the inner and outer surfaces, the base layer 110 may be co-located with or disposed within the inner or outer surface of the object.

The electric field enhancing structure 130 may be provided inside the wrapper to enhance an electric field in response to a predetermined frequency band of electromagnetic waves. For example, the electric field enhancing structure 130 may include a diffraction grating, a metal mesh, a metamaterial, a metal layer including an opening having a width equal to or less than the wavelength of the light source, a structure inducing surface plasmon resonance, Or the like. The opening may be in the form of a slit or a hole.

The electric field enhancing structure 130 may be formed on the base layer 110. Accordingly, the electric field enhancing structure 130 and the base layer 110 may be formed of a laminated film structure. At this time, the electric field enhancing structure 130 may have a first refractive index, and the base layer 110 may have a second refractive index that is smaller than the first refractive index. Accordingly, the refractive index of the electric field enhancing structure 130 is greater than the refractive index of the base layer 110, and the electric field enhancing structure 130 serves as a waveguide, The second electromagnetic wave may be generated between the first and second electrodes 110 and 110.

The sensing layer 150 may be formed on the electric field enhancing structure 130 so that the state of the sensing layer 150 changes according to changes in the environment inside the packaging sheet. In other words, when the sensing layer 150 is changed in the environment inside the wrapping paper, corresponding physical and chemical state changes can be made. When the state of the sensing layer 150 is changed, the first electromagnetic wave irradiated to the sensing layer 150 from the outside may be converted into the corresponding second electromagnetic wave according to the change in the state of the sensing layer 150. At this time, at least one of the frequency information, the reflectivity information, and the Q-factor (Quality Factor) information of the first electromagnetic wave may be changed according to the change of the state of the sensing layer 150. Therefore, the wrapping paper inspecting apparatus (FIGS. 3 and 200) described later can detect a change in the environment inside the wrapping paper through the difference between the first electromagnetic wave firstly incident on the sensor 100 and the second electromagnetic wave detected by the first electromagnetic wave have.

The change in the environment of the wrapping paper and the change in the state of the sensing layer 150 will be separately described in the following embodiments.

FIG. 2 is a cross-sectional view illustrating a flexure sensor 100 'according to another embodiment of the present invention.

As shown, the sensor 100 'of FIG. 2 may include a field enhancement structure 130' of a flexural structure. In other words, the electric field reinforcing structure 130 'may have a protrusion 131' formed to protrude in one direction and a concave portion 133 'formed to be recessed in the other direction. Accordingly, the electric field enhancing structure 130 'may form a grating structure, and the sensing layer 150' may be applied on the grating.

When a first electromagnetic wave such as a terahertz wave is irradiated to the electric field enhancing structure 130 'in which the grating is formed, a second electromagnetic wave having a specific wavelength band and a Q-factor can be generated along a diffraction grating formed of a grating layer have.

FIG. 3 is a conceptual view for explaining the structure and operation method of the wrapping paper inspecting apparatus 200 according to another embodiment of the present invention. FIGS. 4A to 4C are diagrams for explaining a property change of the second electromagnetic wave to be.

As shown in the figure, the wrapping paper inspecting apparatus 200 irradiates the first electromagnetic wave W1 toward the sensor 100 of FIGS. 1 and 2 and detects the second electromagnetic wave W2 generated by the sensor 100 can do. The packaging inspection apparatus 200 may include a light source 210, a detection unit 230, a recognition unit 250, a display unit 270, and a speaker unit 290.

The light source 210 is a means for irradiating the first electromagnetic wave W1 toward the sensor 100. [ For example, the light source 210 may be various types of devices capable of generating terahertz waves. The terahertz wave is a first electromagnetic wave (W1) positioned in the region between the infrared ray and the microwave, and may have a frequency of generally 0.1 THz to 10 THz. However, it should be understood that the present invention can be considered as a terahertz wave even if it is somewhat deviated from such a range, as long as those skilled in the art can easily contemplate the present invention.

The detection unit 230 can detect the second electromagnetic wave W2 generated from the sensor 100. [ In other words, the detection unit 230 can detect frequency information, reflectivity information, Q-factor information, and the like of the second electromagnetic wave W2 reflected from the sensor 100. [

The recognition unit 250 can generate environment change information on the internal environment change of the wrapping paper based on the second electromagnetic wave W2 detected by the detection unit 230. [ In other words, the recognizing unit 250 may generate at least one of the frequency information, the reflectivity information, and the Q-factor information of the first electromagnetic wave W1 and the second electromagnetic wave W2 to generate the environment change information. The comparison method is a method of comparing the frequency information, the reflectance information, and the Q-factor information of the second electromagnetic wave W2 generated when the first electromagnetic wave W1 is irradiated on the sensor 100 provided on the wrapping paper in the steady state, And the change information of the second electromagnetic wave W2 can be determined through the reference value.

The display unit 270 may output environment change information as text information or image information to visually recognize the change. Also, although not shown in the present embodiment, the display unit 270 may be integrated with a user input unit such as a touch screen. The user input unit may input setting information related to the first electromagnetic wave W1 emitted from the light source 210. [

The speaker unit 290 can output environmental change information as voice information and recognize the user as audibly.

Here, the wrapping paper inspecting apparatus 200 is constituted by a housing of a gun type and can irradiate the first electromagnetic wave W1 through a switch portion such as a trigger.

The overall operation of the wrapping paper inspecting apparatus 200 is as follows.

First, the user can set the frequency information of the first electromagnetic wave W1 to be irradiated by the light source 210 through the user input unit. When the setting of the first electromagnetic wave W1 is completed, a reference value corresponding to the first electromagnetic wave W1 can be set through the reference value table stored in a memory unit (not shown). In this case, the reference value may be frequency information, reflectivity information, and Q-factor information of the second electromagnetic wave W2 generated from the sensor in the normal packaging state when the first electromagnetic wave W1 is irradiated.

When the setting of the first electromagnetic wave W1 is completed, the user can irradiate the first electromagnetic wave W1 toward the sensor 100 inside the package through the switch unit. The irradiated first electromagnetic wave W1 may be transmitted through the wrapping paper to generate the second electromagnetic wave W2 from the sensor 100. [ The generated second electromagnetic wave W2 may be detected through the detection unit 230 and the detection information may be transmitted to the recognition unit 250. [ The detection information includes frequency information, reflectivity information, and Q-factor information of the second electromagnetic wave W2, and the recognition unit 250 can compare the information with a predetermined reference value.

In the inspecting method of the inside of the wrapping paper using the wrapping paper inspecting apparatus described above, the conditions for checking the change in the state of the inside of the wrapping paper can be generally confirmed through three kinds of numerical values.

First, as shown in FIG. 4A, a change in the internal environment of the wrapper can be detected through the frequency information. Here, the frequency information relates to the maximum frequency information, and may be the maximum frequency information of the second electromagnetic wave generated from the sensor 100. [

4A, when the first electromagnetic wave is irradiated onto the sensor 100 disposed on the normal wrapping paper in the first light source 210, the second electromagnetic wave having the maximum frequency information f1 as shown in (3) (230). The maximum frequency information of the second electromagnetic wave detected by the detecting unit 230 is the maximum frequency information of the sensor 100 when the foreign substance having the same moisture M is attached to the sensing layer 150 of the sensor 100 as shown in (2) and f2 having the same band as f1.

As described above, in a situation where a foreign matter adheres to the sensor 100, that is, the environment changes inside the wrapping paper, a change in the maximum frequency information among the change characteristics of the electromagnetic waves occurs. The change in the environment inside the wrapping paper can be detected. At this time, the change of the maximum frequency information can be compared within a predetermined error range from the predetermined reference value, or the foreign substance content information ratio table can be referred to as the maximum frequency information. The foreign substance content information ratio table may be a table indicating the content ratio of the foreign substances adsorbed to the sensor 100 according to the maximum frequency information. When the specific maximum frequency information is collected, the content ratio of the foreign substance corresponding thereto is calculated You may.

Next, as shown in FIG. 4B, the environment change inside the wrapping paper can be detected by measuring the absorption coefficient (K) of the sensor and the reflectance thereof.

The reflectivity can be calculated as the detected value of the second electromagnetic wave as a value indicating the degree to which the irradiated first electromagnetic wave is reflected by the sensor.

The absorption coefficient may be a numerical value related to information that the light energy of the first electromagnetic wave irradiated toward the sensor is absorbed and attenuated by the water molecules adsorbed by the sensor when moisture is adsorbed to the sensor. In other words, the absorption coefficient may be a coefficient indicating the rate at which the radio wave or the like attenuates when passing through a specific material.

In other words, when the absorption coefficient is increased as in the above description, the reflectivity is inversely proportional to the decrease, so that when the absorption coefficient increases from 0.00 to 0.10 in 0.02 units as in Fig. 4B, . Therefore, when the reflectivity detected by the second electromagnetic wave and the absorption coefficient of the sensor are different from the predetermined reference value, it can be determined that the environmental change has occurred in the wrapping paper.

Lastly, it can be judged that the environmental change has occurred in the wrapping paper when the Q-factor, which is changed according to the absorption coefficient of the sensor, is out of the relation of the absorption coefficient.

The Q-factor is an exponent used to express the performance of a general resonant structure and can be expressed as a value obtained by dividing the resonance frequency fr by the full width half maximum frequency (Δf). Thus, the formula for calculating the Q-factor can be defined as Q = f / Δf.

This Q-factor has a (finite difference factor analysis) result which decreases according to the formula of Q = f / Δf, f: resonant frequency, and Δf: half-width when the absorption coefficient of the sensor increases. In other words, similar to the above-described reflectivity, the Q-factor has a gradually decreasing inverse relationship with the increase of the absorption coefficient of the sensor, so that a reference value is set based on this and the reflection coefficient of the second electromagnetic wave and the absorption coefficient of the sensor It is possible to detect the environmental change inside the wrapping paper.

The change in the internal environment of the wrapping paper can be detected according to the change of the first electromagnetic wave and the second electromagnetic wave (reflectivity, Q-factor), which can be more clearly summarized in Table 1 of the reference value table below.

Sensor absorption coefficient Reflectivity Reference value

Reflectivity (Fq: 902.5) Absorption coefficient: 0.00
Absorption coefficient: 0.02
Absorption coefficient: 0.04
Absorption coefficient: 0.06
Absorption coefficient: 0.08 0
0.4
0.2
0.1
0.05 0
0.5
0.3
0.2
0.18 Sensor absorption coefficient Q-factor Reference value

Q-factor (Fq: 902.5) Absorption coefficient: 0.00
Absorption coefficient: 0.02
Absorption coefficient: 0.04
Absorption coefficient: 0.06
Absorption coefficient: 0.08 0
200
120
100
40 0
225
170
130
120

The environmental change may be detected by comparing the maximum frequency information detected through the second electromagnetic wave with a reference value in the change of the wrapping paper environment according to the change of the maximum frequency information.

In the case of the reflectivity, when the reference value of reflectivity according to the change of the absorption coefficient of the sensor is compared with the actually measured reflectivity, if the reference error deviates, it can be judged that the environment change has occurred.

The Q-factor can be judged as the occurrence of an environmental change when the Q-factor reference value according to the variation of the absorption coefficient of the sensor is compared with the actually detected Q-factor in the same manner as the reflectance and deviates from the reference error.

Here, the reference value is set to a reference value for convenience of explanation, but a reference value may be set to have a specific range in consideration of an error range. In addition, examples of environmental changes corresponding to reference values such as reflectivity and Q-factor (such as wrapping paper damage, temperature change degree, pressure change degree, etc.) may be additionally associated.

Accordingly, when the comparison result of the second electromagnetic wave and the reference value is out of the reference value, the recognition unit generates environment change information on the corresponding content and outputs it to the display unit or the speaker so that the user can recognize the environment change information.

According to the operation of such a wrapping paper inspecting apparatus, the user can judge whether or not the environment inside the wrapping paper is changed by a simple operation of irradiating the wrapping paper inspecting apparatus to the wrapping paper.

5 is a conceptual diagram for explaining a method of sensing humidity information inside the wrapping paper P through the sensor 100 and the package inspecting apparatus 200. FIG. 5 to 7B, the sensor of FIG. 1 is applied for convenience of explanation, but the sensor of FIG. 2 may also be applied.

As shown in the figure, the sensor 100 is attached to the inner surface of the wrapping paper P containing contents such as confectionary. The wrapping paper inspecting apparatus 200 located outside may irradiate the first electromagnetic wave W1 toward the sensor to detect the second electromagnetic wave 200 generated from the sensor 100. [

At this time, if there is no change in the internal environment of the wrapping paper P as shown in (a), environmental change information on whether the second electromagnetic wave W2 is matched with the reference value can be outputted through the wrapping paper inspection apparatus 200.

However, when an environment change occurs in which moisture (M) increases inside the wrapping paper P due to damage to the wrapping paper P or the like as shown in FIG. 1B, the sensor layer 100 of the sensor 100 And the second electromagnetic wave W2 generated by the sensor 100 may deviate from the reference value. Accordingly, the user can determine whether the wrapping paper P is abnormal based on the environmental change information output from the wrapping paper inspection apparatus 200.

Here, the sensing layer may comprise a moisture modifying material that undergoes a physical change in response to humidity changes. Humidity modifying materials may be selected from the group consisting of Methacrylic Acid Hydroxyalkyl, Polymethacryl Amide, Polyvinyl Alcohol, and the like which can change the volume, mass, density, , And hydrogels (Hydrogel).

6 is a conceptual diagram for explaining a method of sensing pressure information inside the wrapping paper P through the sensor 100 and the package inspecting apparatus 200. As shown in FIG.

First, the pressure inside the wrapping paper P can be 2 Pa in a steady state in which the environment of the wrapping paper P is not changed as in (a). In this case, when the first electromagnetic wave W1 is irradiated to the sensor 100 installed in the wrapping paper P through the wrapping paper inspecting apparatus 200, the second electromagnetic wave W2 matching the reference value can be detected.

However, if an environmental change occurs in which the pressure inside the wrapping paper P is raised to 10 Pa by the external impact as shown in FIG. 2B, the sensing layer of the sensor 100 (not shown in FIG. 1, 150 or less) , The state change corresponding to the pressure can be achieved. In other words, when the pressure is increased, the volume or the structural arrangement of the sensing layer is changed, so that the second electromagnetic wave W2 generated through the sensor 100 can be changed. Accordingly, the user can sense the environmental change information inside the wrapping paper P by detecting the second electromagnetic wave W2 changed.

In the opposite case, the change in the pressure of the wrapping paper P can be sensed through the wrapping paper inspecting apparatus 200. In other words, when the inside of the wrapping paper P is maintained at a pressure of 10 Pa and the inside of the wrapping paper P is communicated (opened) with the outside due to the destruction of the wrapping paper P, The pressure can be lowered. In this case, since the second electromagnetic wave W2 detected through the wrapping paper inspecting apparatus 200 has a detection value opposite to the pressure increase described above, it is possible to determine the damage state of the wrapping paper P through the detection value.

Here, the pressure-sensitive material of the sensing layer may be various known materials whose volume and arrangement are changed according to the pressure.

7A and 7B are conceptual diagrams for explaining a method of sensing temperature information inside the wrapping paper P through the sensor 100 and the wrapping paper inspecting apparatus 200. FIG.

As shown in the drawing, a fresh food which can easily change according to temperature such as tofu can be accommodated in the wrapping paper P.

The environmental change does not occur in the wrapping paper P at the normal temperature as shown in FIG. 7A, and the second electromagnetic wave W2 detected from the sensor 100 through the wrapping paper inspecting apparatus 200 is matched to the reference value .

However, when the wrapping paper is exposed for a long time in a sunlight-strong place or a high-temperature place at 30 ° C as shown in FIG. 7B, the temperature is transferred to the inside of the wrapping paper P, A state change can be generated. At this time, the sensing layer of the sensor 100 may be formed of a material such as paraffin wax, polyolefin wax, thermoplastic resin, polystyrene, And may include at least one of methacrylic resin, polyethylene, natural fat, and oil.

Therefore, when the second electromagnetic wave W2 detected from the sensor 100 of the wrapping paper P through the wrapping paper inspecting apparatus 200 has a value out of the reference temperature range, It is judged that it is exposed to a high temperature, and it can be treated poorly or refrained from use.

A sensor for detecting environmental change information inside the wrapping paper as described above, and a sensor

The wrapping paper inspecting apparatus is not limited to the configuration and operation manner of the embodiments described above. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

100: Sensor
110: base layer
130: electric field enhancing structure
150: sensing layer
200: Packing paper inspection device

Claims (18)

An electric field reinforcing structure installed inside the wrapping paper to reinforce the electric field in response to a predetermined frequency band of electromagnetic waves; And
And a sensing layer formed on the electric field enhancing structure so as to be changed in accordance with an environmental change in the packaging material.
The method according to claim 1,
Wherein the sensing layer
And converts the incident first electromagnetic wave into a second electromagnetic wave corresponding to the state change when the state change occurs.
3. The method of claim 2,
Wherein the second electromagnetic wave includes:
Wherein at least one of frequency information, reflectivity information, and Q-factor (Quality Factor) information of the first electromagnetic wave is changed according to the state change.
The method according to claim 1,
Wherein the sensing layer
A sensor that senses information about changes in the internal environment of the wrapper, including temperature-shifting materials that undergo physical changes in response to temperature changes.
5. The method of claim 4,
The temperature-
It can be used in various fields such as paraffin wax, polyolefin wax, thermoplastic resin, polystyrene, methacrylic resin, polyethylene, natural fat, And a sensor for detecting the internal environment change information of the wrapping paper.
The method according to claim 1,
Wherein the sensing layer
A sensor that senses information about changes in the internal environment of the wrapper, including moisture deformation materials that cause physical changes in response to humidity changes.
The method according to claim 6,
The moisture deformation material may include,
Detecting at least one of environmental change information on the wrapping paper including at least one of Methacrylic Acid Hydroxyalkyl, Polymethacryl Amide, Polyvinyl Alcohol, and Hydrogel. The sensor.
The method according to claim 1,
Wherein the sensing layer
A sensor that senses information about changes in the environment of the wrapping paper, including pressure-strain materials that undergo physical changes in response to pressure changes.
The method according to claim 1,
And a base layer formed to be attached to the inside of the wrapping paper,
Wherein the electric field enhancing structure comprises:
And a sensor disposed on the base layer for sensing information on internal environment change of the wrapping paper.
10. The method of claim 9,
Wherein the electric field enhancing structure is formed to have a first refractive index, and the base layer is formed to have a second refractive index smaller than the first refractive index.
The method according to claim 1,
Wherein the electric field enhancing structure comprises:
Wherein a protrusion formed so as to protrude in one direction and a recess formed to be recessed in the other direction are alternately and continuously arranged.
The method according to claim 1,
Wherein the electric field enhancing structure comprises:
Wherein at least one of a diffraction grating, a metal mesh, a metamaterial, a metal layer including an opening having a width equal to or less than the wavelength of the light source, a structure for inducing surface plasmon resonance, and a photonic crystal structure, sensor.
An electric field reinforcing structure provided inside the wrapping paper to reinforce an electric field in response to a predetermined frequency band of electromagnetic waves; and a sensing layer coated on the electric field reinforcing structure to change a state according to an environmental change in the packaging sheet.
A light source for irradiating the first electromagnetic wave with the sensor;
A detector for detecting a second electromagnetic wave generated from the sensor; And
And a recognition unit for generating environmental change information on the environmental change inside the wrapping paper based on the second electromagnetic wave detected by the detection unit.
14. The method of claim 13,
Wherein the sensing layer
A temperature-modifying material that undergoes a physical change with temperature change,
The temperature-
It can be used in various fields such as paraffin wax, polyolefin wax, thermoplastic resin, polystyrene, methacrylic resin, polyethylene, natural fat, Oil). ≪ / RTI >
14. The method of claim 13,
Wherein the sensing layer
A moisture modifying material that undergoes physical changes in response to humidity changes,
The moisture deformation material may include,
Wherein at least one of the thermoplastic resin and the thermoplastic resin comprises at least one of Methacrylic Acid Hydroxyalkyl, Polymethacryl Amide, Polyvinyl Alcohol, and Hydrogel.
14. The method of claim 13,
Wherein the sensing layer
And a pressure modifying material that undergoes a physical change in response to a pressure change.
14. The method of claim 13,
Wherein,
Wherein the environmental change information is generated by comparing at least any one of frequency information, reflectivity information, and Q-factor information of the first electromagnetic wave and the second electromagnetic wave.
14. The method of claim 13,
A display unit configured to output the environmental change information as image information; And
And a speaker unit configured to output the environmental change information as audio information.

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