KR20230031399A - Portable type apparatus for measuring thermal porperty - Google Patents

Abstract

According to one embodiment of the present invention, a portable thermal property measurement device comprises: a thermal maintaining body coming in contact with an object for recognizing thermal sensation; a heater disposed on one side of the thermal maintaining body to provide heat to the thermal maintaining body; a temperature sensor disposed on the other side of the thermal maintaining body to measure temperature of the thermal maintaining body; and a contact force restraint member uniformly maintaining contact force by restraining the contact force in the restrained contact force when the contact force between the thermal maintaining body and the object is larger than the preset restrained contact force when the thermal maintaining body comes in contact with the object.

Description

Portable Thermal Characteristics Meter {PORTABLE TYPE APPARATUS FOR MEASURING THERMAL PORTERTY}

The present invention relates to a portable thermal characteristics measuring device, and more particularly, to a portable thermal characteristics measuring device capable of rapidly measuring the temperature and thermal characteristics of a contact object in a short time and further increasing the accuracy and reliability of measurement results.

In general, a person puts a finger or palm in contact with a contact object and recognizes the warmth of the contact object (hereinafter referred to as 'warm feeling') according to the degree of heat loss from the finger or palm, and can determine the material of the contact object. .

Since all common materials have a thermal equilibrium state with respect to the ambient temperature at room temperature, the temperature is all in the same state. However, since the temperature of the human body is higher than room temperature, heat transfer from the human body to the material occurs when the human body and the material come into contact. At this time, a difference in the amount of heat transferred from the human body to the contact object occurs according to the thermal effusivity of the material of the contact object.

In other words, a contact object such as a metal material is recognized as cold because the amount of heat transferred from the human body to the contact object is large, and a contact object such as winter clothes is regarded as warm because the amount of heat transferred from the human body to the contact object is small. Recognize.

On the other hand, a thermal characteristic measuring device has been developed that imitates the mechanism for recognizing the human sense of warmth. The thermal characteristics measuring device as described above is a method of inspecting the material and texture of the contact object by measuring the heat emission rate of the contact object, and can be used as a fabric inspector for clothing or an artificial finger of a robot. Existing thermal characteristics measurement method measures the temperature of the contact surface after reaching thermal equilibrium, not the degree of instantaneous temperature change, because the temperature change per unit time according to the contact force of the contact with the thermal characteristics measuring device is different from each other. way to measure it.

Therefore, the existing thermal characteristics measuring method measures the thermal characteristics of the contact by measuring the temperature of the thermal characteristics measuring device after waiting until the thermal characteristics measuring device and the contacting object reach a complete thermal equilibrium state after making complete contact with the contact object. is being provided. For example, Korean Patent Registration No. 2010-0051139 (title of invention: material identification device, registration date: 2014.05.27) detects the temperature change according to the thermal conductivity of the contact object and then calculates the thermal characteristic value of the contact object material. A material discrimination device for extracting and determining the type of contact is disclosed.

In the existing measurement method in a thermal equilibrium state, the contact force is acting as a dominant factor in the measurement time because the time to reach the thermal equilibrium state is also shortened according to the contact force between the thermal characteristic measuring device and the contact object. Therefore, the existing thermal characteristics measuring device has a problem in that it takes a long time to reach a thermal equilibrium state with the contact object, and thus has a long measurement time. However, if sufficient measurement time is provided between the thermal characteristics measuring device and the contact object, there is no significant difference in the measurement accuracy of the thermal characteristics measuring device regardless of the size of the contact force.

By the way, the need for a thermal characteristic measuring device to quickly measure the sense of warmth of a contact like a person has recently been urgently requested. To this end, a method of rapidly measuring the thermal characteristics of a contact object through a temperature change occurring at the moment the contact object is in contact with the thermal property measuring device is required. However, in the conventional thermal characteristic measuring instrument, a structure for limiting the contact force is not applied, or a technique for simultaneously measuring and correcting the contact force is not applied.

Korean Patent Publication No. 2010-0051139 (Registered on May 27, 2014)

An embodiment of the present invention provides a portable thermal characteristics measuring device capable of quickly and accurately measuring the temperature and thermal characteristics of a contact object within a short time.

In addition, the embodiment of the present invention can keep the contact force constant at the limit contact force by limiting the rise of the contact force reaching the limit contact force by limiting the contact force to the limit contact force or less during contact with the contact object, and the temperature and heat of the contact object Provided is a portable thermal characteristics measuring instrument capable of stably and accurately measuring properties.

In addition, an embodiment of the present invention is a portable thermal characteristics measuring device capable of quickly measuring the temperature and thermal characteristics of a contact object before reaching thermal equilibrium with the contact object by using a plurality of unit measuring devices having different temperatures together. provides

According to one embodiment of the present invention, a heat retainer in contact with a contact object for recognizing a sense of warmth, a heater disposed on one side of the heat retainer to provide heat to the heat retainer, and the thermal oil to measure the temperature of the heat retainer A temperature sensor disposed on the other side of the retardant, and a contact force that limits the contact force to the limited contact force and keeps it constant when the contact force between the heat retainer and the contact object becomes greater than a preset limited contact force when the heat retainer is brought into contact with the contact object. A portable thermal characteristics measuring device including a limiting member is provided.

Here, the portable thermal characteristics measuring device according to an embodiment of the present invention may further include a control unit for measuring the thermal characteristics and temperature of the contact object through a detection result of the temperature sensor when the heat retainer contacts the contact object. .

The heat retainer, the temperature sensor, and the heater may be provided in plurality. The heat retainers may simultaneously come into contact with the contact object while being maintained at different temperatures. At this time, the control unit measures the thermal characteristics and temperature of the contact object before the heat retainers and the contact object reach thermal equilibrium using temperature changes of the temperature sensors when the contact object contacts the heat retainers. can do.

Preferably, the contact force limiting member includes a first case in which the other end of the heat retainer is fixed so that one end of the heat retainer protrudes toward the contact object, and one end of the heat retainer has a predetermined height toward the contact object. A second case movably coupled to the outside of the first case so as to protrude, and provided between the second case and the first case and elastically deforming when one end of the heat retainer comes into contact with the contact object. An elastic body configured to set a contact force between the heat retainer and the contact object to be less than or equal to the limited contact force may be included.

Here, the contact force limiting member may further include a pressure sensor provided between the elastic body and the second case to measure the contact force between the heat retainer and the contact object.

Preferably, a contact portion for contacting the contact object may be formed at one end of the heat retainer. Surface roughness of the contact portion may be finely improved through surface processing in order to increase a contact area with the contact object.

The temperature sensor may be disposed at a location spaced apart from the heater and disposed closer to the contact portion than the heater to measure the temperature of the contact portion without being affected by heat of the heater.

Preferably, the heat retainer may be provided with a predetermined thin thickness so that the temperature change rapidly when in contact with the contact object. In this case, the temperature sensor may be disposed at one end of the heat retainer, and the heater may be disposed at the other end of the heat retainer.

A bent portion corresponding to a surface shape of the first case may be provided between one end and the other end of the heat retainer to position the first case on a straight line distance between the temperature sensor and the heater.

Preferably, the second case may be moved along the first case until it comes into contact with the contact object by an external force upon contact between the heat retainer and the contact object. In this case, the heat retainer and the first case may be accommodated inside the second case in a state in which contact force between the heat retainer and the contact object is constant.

Preferably, the elastic body may be provided with any one of a spring member and a silicon member. Meanwhile, a gap may be formed inside the silicon member to facilitate elastic deformation of the silicon member.

Preferably, the heater is not disposed and only the temperature sensor is disposed in one of the heat retainers so as to have the same temperature as that of the contact object.

Preferably, the heat retainers may include a first heat retainer and a second heat retainer disposed to be spaced apart from each other. The first heat retainer and the second heat retainer have different initial temperatures (T ₁ , T ₂ ), but are formed of the same material and have the same heat release rates (e ₁ , e ₂ ). . The control unit may derive a thermal emission rate correlation coefficient (γ) reflecting the initial temperature (To) of the contact object and the thermal diffusivity of the contact object using the following formula, and the thermal emission rate correlation coefficient (γ) The heat emission rate (e ₀ ) of the contact material can be calculated using

Here, t is the contact time, τ is a time constant, T ₁ is the initial temperature of the first thermal oil, ΔT ₁ is the temperature change of the first thermal oil over time t, and T ₂ is the second thermal oil is the initial temperature of the delay, ΔT ₂ is the temperature change of the second heat retainer according to time t, e ₁ is the heat release rate of the first heat retainer, e ₂ is the heat release rate of the second heat retainer , e ₀ is the thermal release rate of the contact material.

Since the portable thermal characteristics measuring instrument according to an embodiment of the present invention has a structure in which the contact force limiting member limits the contact force between the heat retainer and the contact object within the limited contact force during contact between the contact object and the heat retainer, the contact force between the heat retainer and the contact object increases. However, since the contact force limiting member limits the contact force to the limited contact force and keeps it constant, it is possible to prevent abnormal fluctuations in the temperature of the heat retainer and the contact object according to the change in the contact force of the heat retainer and the contact object in advance, thereby preventing the temperature of the contact object. It is possible to improve the accuracy and reliability of the portable thermal characteristics measuring instrument by stably and accurately measuring the thermal characteristics and the thermal characteristics.

In addition, the portable thermal characteristics measuring device according to an embodiment of the present invention can keep the contact force constant at the limit contact force by limiting the increase in the contact force reaching the limit contact force when the heat retainer and the contact object are in contact, and the abnormal increase in the contact force It is possible to prevent an abnormal rise in the temperature of the contact part between the heat retainer and the contact object in advance, and the temperature and thermal characteristics of the contact object can be stably measured in a state where the contact force between the heat retainer and the contact object is set to be constant. Therefore, in the present embodiment, since there is no need to consider the temperature change of the heat retainer and the contact object according to the change in contact force, the convenience of use of the portable thermal characteristics measuring instrument can be improved.

In addition, the portable thermal characteristics measuring device according to an embodiment of the present invention is provided with a plurality of unit measuring devices equipped with a heat retainer, a temperature sensor, and a heater, but the temperature of the heat retainer of the unit measuring devices is formed to be different from each other to have different temperatures. Since the unit measuring devices are brought into contact with the contact object, the temperature and thermal characteristics of the contact object can be quickly measured through the temperature change of the unit measuring devices before the unit measuring devices and the contact object reach thermal equilibrium. Therefore, in the present embodiment, the convenience of use of the portable thermal characteristics measuring device can be improved by quickly measuring the temperature and thermal characteristics of the contact object in a short time at the point of contact between the unit measurers and the contact object.

In addition, the portable thermal characteristics measuring device according to an embodiment of the present invention is formed in a compact structure as a whole and can be easily applied to a fabric inspector for clothing, an artificial finger of a robot, and a portable texture measuring device, and can provide thermal property data of various objects. After setting in advance, you can easily measure the material of the contact by using it.

In addition, the portable thermal characteristics measuring device according to an embodiment of the present invention applies the temperature measurement result for the heat retainer of the unit measuring devices in contact with the contact object to a preset formula to calculate the thermal release rate correlation coefficient reflecting the thermal diffusivity of the contact object. It can be derived very simply, and the thermal characteristics and temperature of the contact object can be smoothly calculated through the thermal ejection rate correlation coefficient.

1 is a perspective view showing a portable thermal characteristics measuring device according to an embodiment of the present invention.
FIG. 2 is a diagram schematically illustrating a cross section of the portable thermal characteristics measuring instrument shown in FIG. 1 .
FIG. 3 is a view showing an operating state of the portable thermal characteristics measuring instrument shown in FIG. 2 .
4 to 8 are graphs showing experimental results of the portable thermal characteristics measuring device shown in FIGS. 2 and 3 .
9 is a view showing the results of measuring the temperature of a contact by a portable thermal characteristics measuring device according to an embodiment of the present invention.
FIG. 10 is a graph showing the result of measuring the sense of warmth of the contact object shown in FIG. 9 and the sense of warmth perceived by a person.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the examples. Like reference numerals in each figure indicate like elements.

1 is a perspective view showing a portable thermal characteristics measuring instrument 100 according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing a cross section of the portable thermal characteristics measuring instrument 100 shown in FIG. 1 , and FIG. 3 is a view showing an operating state of the portable thermal characteristic measuring instrument 100 shown in FIG. 2 .

1 to 3, the portable thermal characteristics meter 100 according to an embodiment of the present invention includes a heat retainer 110, a heater 120, a temperature sensor 130, a contact force limiting member 140, and a control unit. (150).

The portable thermal characteristics measuring device 100 according to this embodiment implements a mechanism for recognizing the warmth of the contact object 10 by a person, and includes a plurality of unit measuring devices 100a and 100b having different temperatures. can do. The contact object 10 as described above is a material for recognizing a sense of warmth, and contact objects 10 made of various materials having different thermal effusivities may be used. For example, materials of various materials having different heat release rates, such as fabric, metal, ceramic, wood, or leather, may be used as the contact object 10 .

That is, in the present embodiment, when the unit measurers 100a and 100b contact the contact object 10, the unit measurers 100a and 100b measure the temperature attenuation of the unit time to determine the thermal characteristics and temperature of the contact object 10. can be quickly measured. At this time, the control unit 150 derives the thermal emission rate correlation coefficient by using the equation of the thermal emission rate correlation coefficient that correlates with the thermal emission rate of the contact object 10, which will be described later, and then uses this to derive the thermal emission rate correlation coefficient of the contact object 10. Thermal characteristics and temperature can be detected.

The unit measuring devices 100a and 100b as described above may be composed of a heater 120, a heat retainer 110, and a temperature sensor 130, respectively. At this time, the heat retainers 110 may have different temperatures by the heaters 120 to which different voltages are applied. Therefore, the unit measurers 100a and 100b of the present embodiment sense and analyze the temperature change characteristics of the heat retainers 110 having different temperatures when in contact with the contact object 10, thereby analyzing the thermal characteristics and temperature of the contact object 10. can measure

For reference, any one of the unit measuring devices 100a and 100b of the unit measuring devices 100a and 100b may include only the heat retainer 110 and the temperature sensor 130 by omitting the heater 120 . That is, in the unit measuring devices 100a and 100b in which the heater 120 is omitted, the temperature of the heat retainer 110 may have the same temperature as the room temperature, unlike the heat retaining member 110 of the other unit measuring devices 100a and 100b. . However, as shown in FIGS. 1 to 3, in the portable thermal characteristic measuring device 100 of this embodiment, two unit measuring devices 100a and 100b are provided in symmetrical shapes, but the heater 120 is a unit measuring device ( 100a, 100b) will be described as being provided respectively.

In addition, the unit measurers 100a and 100b of the present embodiment are in contact with the contact object 10 in a state maintained at different temperatures, but the contact force with the contact object 10 is set in advance by the contact force limiting member 140. It can be limited to below the limiting contact force. That is, when the unit measuring devices 100a and 100b are brought into contact with the contact object 10, even if the contact force of the unit measuring devices 100a and 100b increases to more than the limiting contact force, the contact force is constant as the limiting contact force by the contact force limiting member 140. Since the unit measuring devices 100a and 100b are in contact with the contact object 10 with a constant contact force, the measurement performance of the portable thermal characteristic measuring device 100 can be stably secured.

On the other hand, the portable thermal characteristics measuring device 100 according to the present embodiment measures the temperature change characteristics of the heat retainer 110 generated when the contact object 10 is in contact with the heat retainer 110 heated by the heater 120. It can be provided with a compact structure that quickly detects the thermal characteristics and temperature of the contact object 10 by measuring it with the temperature sensor 130 . Therefore, the portable thermal characteristics measuring device 100 is a portable texture measuring device that determines the material of the contact object 10 by manufacturing a structure applicable to a sensor for a robot, a smart device, or an input tool of a smart device that needs to recognize a human-like sense of warmth. , prosthetic hands, fabric tester for clothing, or fabric evaluation device for clothing.

Hereinafter, the detailed configuration of the portable thermal characteristics measuring instrument 100 according to an embodiment of the present invention will be described in more detail.

1 to 3, the heat retainer 110 of this embodiment may come into contact with the contact object 10 when the portable thermal characteristics measuring instrument 100 and the contact object 10 come into contact, and the contact object 10 ), the temperature can be changed through contact with In this embodiment, when the heat retainer 110 comes into contact with the contact object 10, it may be made of a metal material having a predetermined thin thickness so that the temperature change proceeds rapidly.

For example, the heat retainer 110 of this embodiment is preferably formed of a thin metal plate having a thickness of 2 mm or less. Therefore, the heat retainer 110 can rapidly increase its temperature through the heat applied by the heater 120 and quickly recover heat lost when it comes into contact with the contact object 10 .

As shown in FIGS. 2 and 3, a contact portion 112 for contacting the contact object 10 may be formed at the lower end of the heat retainer 110, and at the upper end of the heat retainer 110, a contact force limit described later may be formed. A fixing part 114 for fixing to the first case 142 of the member 140 may be formed.

Surface roughness of the contact portion 112 may be minutely improved through surface processing in order to increase a contact area with the contact object 10 . In fact, as the surface of the heat retainer 110 becomes smoother, the contact area with the contact object 10 increases in a microscopic area, so the temperature change occurring when contacting the contact object 10 may also increase. To this end, the surface of the contact portion 112 may be polished to improve surface roughness. The temperature change of the heat retainer 110 as described above is a very important factor in measuring the thermal characteristics of the contact object 10. That is, the contact area between the heat retainer 110 and the contact object 10 can have a great influence on the heat exchange between the heat retainer 110 and the contact object 10, which also affects the temperature change of the heat retainer 110. can be greatly affected

For reference, in view of the fine surface structure, all materials may have fine surface roughness. The fine surface roughness as described above may cause fine deformation according to the contact force in relation to the surface hardness of the material. That is, since the contact area between the heat retainer 110 and the contact object 10 changes according to the magnitude of the contact force, it is preferable that the contact force be maintained constant in order to precisely measure the thermal characteristics of the contact object 10.

In particular, a bent portion 116 corresponding to the surface shape of the first case 142 may be provided between an upper end and a lower end of the heat retainer 110 . That is, the bent part 116 may be bent along the surface shape of the first case 142 at a position spaced apart from the first case 142 at an intermediate portion between the upper end and the lower end of the heat retainer 110 . 2 and 3, the fixing part 114 may be provided in a vertically erected shape along the side surface of the first case 142, and the contact part 112 is the first case facing the contact object 10 ( 142) may be provided in a state of being laid side by side along the lower surface. The fixing part 114 and the contact part 112 as described above are connected via the bent part 116, and may be bent according to an angle formed between the side surface and the lower surface of the first case 142.

As described above, the contact part 112 and the fixing part 114 of the heat retainer 110 have a structure bent around the bent part 116, but may be disposed closely along the side surface and lower surface of the first case 142. there is. Therefore, since the temperature sensor 130 installed on the contact part 112 and the heater 120 installed on the fixing part 114 are shielded from each other by the first case 142, there is a gap between the heater 120 and the temperature sensor 130. Since the space forming the straight distance of is blocked by the first case 142 , the first case 142 may block heat generated from the heater 120 from being transferred to the temperature sensor 130 .

Meanwhile, the heat retainer 110 may be provided as a first heat retainer 110a and a second heat retainer 110b in the portable thermal characteristics measuring instrument 100 . The first heat retainer 110a and the second heat retainer 110b can be maintained at different temperatures, and when the portable thermal characteristics measuring instrument 100 is used, they are in contact with the contact object 10 at the same time, and the temperature increases at different rates. can be changed. Here, the first heat retainer 110a and the second heat retainer 110b may be symmetrically arranged facing each other in the first case 142 of the contact force limiting member 140, but are not limited thereto. The arrangement structure of the first heat retainer 110a and the second heat retainer 110b may be variously changed.

Referring to FIGS. 2 and 3 , the heater 120 of this embodiment may perform a function of raising the heat retainer 110 to an appropriate temperature by providing heat to the heat retainer 110 . The heater 120 may be disposed on the fixing part 114 of the heat retainer 110 . For example, the heater 120 may be formed of a micro-heater structure attached to the surface of the heat retainer 110 .

The heater 120 may be provided as a first heater 120a and a second heater 120b that supply heat of different sizes. The first heater 120a may be installed on the fixing part 114 of the first heat retainer 110a, and the second heater 120b may be installed on the fixing part 114 of the second heat retainer 110b. there is. At this time, the first heater 120a and the second heater 120b provide heat of different sizes to the first heat retainer 110a and the second heat retainer 110b, thereby providing heat to the first heat retainer 110a and the second heat retainer 110b. The temperature of the two heat retainers 110b can be made and maintained differently.

Referring to FIGS. 2 and 3 , the temperature sensor 130 according to the present embodiment may measure the temperature of the heat retainer 110 in real time and measure the temperature change of the heat retainer 110 at all times. The temperature sensor 130 may be disposed on the contact part 112 of the heat retainer 110 . For example, the temperature sensor 130 may be disposed at a portion of the contact portion 112 of the heat retainer 110 that is not in contact with the contact object 10 .

The temperature sensor 130 may be provided as a first temperature sensor 130a and a second temperature sensor 130b that measure the temperatures of the first heat retainer 110a and the second heat retainer 110b. The first temperature sensor 130a may be installed on the contact part 112 of the first heat retainer 110a, and the second temperature sensor 130b may be installed on the contact part 112 of the second heat retainer 110b. there is. At this time, the first temperature sensor 130a and the second temperature sensor 130b are not affected by the heat of the first heater 120a and the second heater 120b, and the first heat retainer 110a and the second heat oil It may be disposed at a position spaced apart from the first heater 120a and the second heater 120b to measure the temperature of the contact portion 112 of the member 110b.

As shown in FIGS. 2 and 3, the unit measuring devices 100a and 100b of the present embodiment include a first unit measuring device 100a and a second unit measuring device 100a and second unit measuring devices symmetrically disposed on both sides of the first case 142 ( 100 b). At this time, the first unit measuring device 100a and the second unit measuring device 100b may be in contact with the surface of the contact object 10 at the same time.

The first unit measuring devices 100a and 100b may include a first heat retainer 110a, a first heater 120a, and a first temperature sensor 130a. The first unit measuring devices 100a and 100b as described above may increase the temperature of the first heat retainer 110a to the first temperature by the heat generated by the first heater 120a, and the first temperature sensor ( 130a) can measure the temperature change of the first heat retainer 110a in real time.

The second unit measurers 100a and 100b may include a second heat retainer 110b, a second heater 120b, and a second temperature sensor 130b. The second unit measuring devices 100a and 100b as described above can increase the temperature of the second heat retainer 110b to the second temperature by the heat generated by the second heater 120b, and the second temperature sensor ( 130b) can measure the temperature change of the second heat retainer 110b in real time.

1 to 3 , in the contact force limiting member 140 of this embodiment, when the heat retainer 110 comes into contact with the contact object 10, the contact force between the heat retainer 110 and the contact object 10 is reduced in advance. When the contact force is greater than the set limit contact force, the contact force may be kept constant by limiting the contact force to the limit contact force.

That is, in this embodiment, since the contact force limiting member 140 is installed to limit the contact force equal to or greater than the limited contact force to the limited contact force, the deviation of the measurement result due to the change in the contact force when measuring the thermal characteristics of the contact object 10 is minimized. It is possible to improve the precision of the portable thermal characteristics measuring instrument 100 by reducing If a separate mechanism (for example, a motorized stage) for maintaining a constant contact force between the heat retainer 110 and the contact object 10 is additionally installed in the portable thermal characteristics measuring instrument 100, the contact force is constant to a desired size. Although it can be adjusted, the size and weight of the portable thermal characteristics measuring instrument 100 may increase, thereby reducing overall portability.

For example, the contact force limiting member 140 may include a first case 142 , a second case 144 , an elastic body 146 , and a pressure sensor 148 .

As shown in FIGS. 2 and 3 , the fixing part 114 of the heat retainer 110 may be fixed to the first case 142 . At this time, the contact portion 112 of the heat retainer 110 may be disposed to protrude more toward the contact object 10 than the first case 142 . Therefore, when the portable thermal characteristics measuring instrument 100 is in contact with the surface of the contact object 10, only the contact portion 112 of the heat retainer 110 may come into contact with the contact object 10.

Here, the heat retainer 110, the heater 120, and the temperature sensor 130 may be installed in a structure inserted into the installation grooves 142a and 142b formed inside the first case 142. For example, in the installation grooves 142a and 142b, the first unit measuring devices 100a and 100b composed of the first heat retainer 110a, the first heater 120a, and the first temperature sensor 130a are installed. A second installation groove 142b in which the installation groove 142a, and the second unit measuring devices 100a and 100b composed of the second heat retainer 110b, the second heater 120b, and the second temperature sensor 130b are installed can be provided as

And, the first case 142 may be provided in a box shape with installation grooves 142a and 142b formed therein. The first case 142 is preferably formed of a material having low heat emission rate and low thermal conductivity so that the sensing result of the temperature sensor 130 is not abnormally affected by heat generated from the heat 120 . In addition, the first case 142 is preferably formed so as not to come into contact with a part other than the fixing part 114 of the heat retainer 110, the temperature sensor 130, or the heater 120. Because, when the first case 142 comes into contact with the heat retainer 110, the temperature sensor 130, or the heater 120, the temperature change of the heat retainer 110 may be distorted. That is, the temperature change characteristic of the heat retainer 110 that appears when the contact object 10 and the heat retainer 110 come into contact is that the heat of the heater 120 moves through the first case 142 to the temperature sensor 130 It may be affected by being transmitted to or as the heat of the heat retainer 110 is released to the first case 142, and by minimizing this, the temperature change characteristic can be stably measured.

In addition, the first case 142 may be provided with a structure to shield a space corresponding to a straight line distance between the temperature sensor 130 and the heater 120 installed on the heat retainer 110 . When the heater 120 and the temperature sensor 130 are provided in a structure directly facing each other through a space forming a separation distance between the heater 120 and the temperature sensor 130, the heater 120 generates the heat through the space of the separation distance. Although the generated heat can be directly transferred to the temperature sensor 130, when a part of the first case 142 is provided in the space of the corresponding distance, the heat of the heater 120 transmitted through the space of the corresponding distance is blocked. It can be.

The separation distance between the heater 120 and the temperature sensor 130 as described above may be formed at a distance of several mm or more on the same plane along the surface of the heat retainer 110, but is not limited thereto, and the portable thermal characteristics measuring device 100 It can be changed in various ways according to the design conditions and circumstances of However, when the separation distance between the heater 120 and the temperature sensor 130 is larger than several cm on the same plane of the heat retainer 110, the time required for the temperature rise of the heat retainer 110 may increase. Therefore, it is preferable to set the separation distance between the heater 120 and the temperature sensor 130 within an appropriate range.

As shown in FIGS. 2 and 3 , the second case 144 may be movably coupled to the outside of the first case 142 . In this embodiment, it will be described that the first case 142 is coupled to the inside of the second case 144 in a movable form. Meanwhile, the first case 142 and the second case 144 may be provided so that the contact portion 112 of the heat retainer 110 protrudes toward the contact object 10 at a preset height H. For example, an opening open toward the contact object 10 is formed in the second case 144 , and the first case 142 may be inserted into the opening in a linear sliding motion.

Here, the second case 144 is the first case ( 142 may be moved towards the contact 10 . At this time, the heat retainer 110 and the first case 142 are accommodated inside the second case 144, and the contact force between the contact portion 112 of the heat retainer 110 and the contact object 10 increases to the limit contact force. After the elastic body 146, it is possible to maintain a constant limiting contact force.

In addition, a plurality of guide grooves 145 may be formed on the inner side of the second case 144 along the moving direction of the first case 142, and the guide grooves 145 on the outer side of the first case 142. ) A plurality of guide protrusions 143 for being movably inserted into them may protrude. Therefore, when the first case 142 is moved while being accommodated inside the second case 144, the guide protrusions 143 slide along the guide grooves 145 to move the first case 142 and the heat retainer. The movement of (110) can be stably guided. As shown in FIGS. 2 and 3 , barriers may be provided inside the guide grooves 145 to prevent the guide protrusions 143 from escaping.

As shown in FIGS. 2 and 3 , the elastic body 146 may be provided in a form sandwiched between the second case 144 and the first case 142 . That is, when the contact portion 112 of the heat retainer 110 comes into contact with the contact object 10, the first case 142 is housed inside the second case 144 together with the heat retainer 110. It can be moved, and the elastic body 146 can be elastically compressed by the first case 142 between the first case 142 and the second case 144 . At this time, the elastic body 146 can set the contact force between the heat retainer 110 and the contact object 10 to a limit contact force or less while being elastically compressed and deformed.

Here, the elastic body 146 may be provided with any one of a spring member and a silicon member. Hereinafter, in this embodiment, although the elastic body 146 is described as being provided as a silicon member, a plurality of air gaps may be formed inside the silicon member so that the elastic deformation of the silicon member is smoothly performed. That is, a plurality of air gaps may be formed inside the elastic body 146 provided as a silicon member for elastic deformation of the silicon member, and difficulties in elastic deformation due to limitations in material characteristics of the silicon member may be prevented.

In addition, the modulus of elasticity and thickness (T) of the elastic body 146 may be designed in advance, and the displacement (H) of the first case 142 inserted into the second case 144 is also the first case 142 ) and the designed height difference (H) of the second case 144 and the thickness (T) of the elastic body 146 may be set in advance. At this time, since the height difference (H) between the first case 142 and the second case 144 is greater than the thickness (T) of the elastic body 146, the contact force between the heat retainer 110 and the contact object 10 is When transferred to one case 142, the thickness T' of the elastic body 146 is elastically reduced by the first case 142, and the contact force between the heat retainer 110 and the contact object 10 can be limited. there is.

Meanwhile, the maximum limiting contact force F limited by the elastic body 146, the first case 142, and the second case 144 may be calculated by [Equation 1] below.

Here, d is the reference numeral 'H' shown in FIG. 2 and corresponds to the height difference between the lowermost end of the second case 144 and the contact portion 112 of the heat retainer 110, t is the view shown in FIG. The symbol 'T' represents the thickness of the elastic body 146. At this time, d has the same size as the change in thickness (T−T′) of the elastic body 146 shown in FIGS. 2 and 3 . Further, E is the Young's modulus of the elastic body 146, k is the elastic modulus of the elastic body 146, and A is the surface area of the elastic body 146.

In this embodiment, even when a contact force equal to or greater than the maximum limit contact force F is applied to the portable thermal characteristics measuring instrument 100, the contact force may be limited to the maximum limit contact force F.

As shown in FIGS. 2 and 3 , the pressure sensor 148 may measure the contact force between the heat retainers 110 and the contact object 10 . The pressure sensor 148 as described above may be provided between the elastic body 146 and the second case 144 . That is, the pressure sensor 148 measures the contact force smaller than the limiting contact force in real time when the contact portion 112 of the heat retainers 110 and the contact object 10 come into contact, but When the contact force is greater than the limited contact force, the limited contact force F uniformly limited by the elastic body 146 may be measured.

As shown in FIGS. 2 and 3 , the control unit 150 determines the thermal characteristics of the contact object 10 through the detection results of the temperature sensors 130 upon contact between the heat retainers 110 and the contact object 10. temperature can be measured. At this time, the control unit 150 uses the temperature change of the temperature sensors 130 when the heat retainers 110 and the contact object 10 come into contact so that the heat retainers 110 and the contact object 10 are in thermal equilibrium. The thermal properties and temperature of the contact 10 can be measured prior to arrival.

The heat retainers 110 as described above may be in contact with the contact object 10 at the same time while being maintained at different temperatures. At this time, the control unit 150 may measure the temperature of the temperature sensors 130 in real time within a preset short time when the heat retainers 110 and the contact object 10 come into contact, and the temperature of the temperature sensors 130 Using the difference, the thermal characteristics and temperature of the contact object 10 can be quickly measured. On the other hand, in this embodiment, the control unit 150 uses the following equations to determine the initial temperature (To) of the contact object 10 and the thermal ejection rate correlation coefficient (γ) reflecting the thermal diffusivity of the contact object 10 can be derived, and the thermal emission rate (e ₀ ) of the contact object 10 can be calculated using the thermal emission rate correlation coefficient (γ).

Hereinafter, a process in which the control unit 150 derives the thermal emission rate correlation coefficient (γ) using various types of equations in the portable thermal characteristics measuring device 100 according to an embodiment of the present invention will be described in detail. do.

In general, when the heat retainers 110 of the portable thermal characteristics measuring instrument 100 are in contact with the contact objects 10 having different temperatures and heat release rates in a state of having different temperatures, different temperatures (T) and Contact surfaces of two objects having different heat release rates (e) (eg, the heat retainers 110 and the contact object 10) reach an equilibrium state at the temperature Tm over time. At this time, the temperature Tm is determined by the temperature (T) and the heat release rate (e) of the two objects as shown in [Equation 2] below.

Here, the existing heat measurement method is a method of measuring by arranging an object whose heat release rate is known in advance and an object to be measured as object 1 and object 2, and the heat release rate (e) is derived through [Equation 2] It can be done, but this is a technique that can be measured only when thermal equilibrium is reached, and there is a problem in that it takes a lot of time.

Therefore, in this embodiment, the heat release rate correlation coefficient of the contact object 10 can be derived through the temperature change measured at the initial point in time when the heat retainers 110 and the contact object 10 come into contact. That is, when two objects having different temperatures (eg, the heat retainers 110 and the contact object 10) come into contact, the temperature change of the object 1 (eg, the heat retainers 110) is a cooling curve mode (cooling curve mode). curve model) according to [Equation 3] below.

Here, T ₁ (0) = T ₁ when t = 0, and can converge to Tm when t = ∞.

Therefore, T1(t) can be expressed as [Equation 4] below.

Here, when the temperature change of object 1 (eg, the heat retainer 110) with respect to the time t after contact is ΔT ₁ , ΔT ₁ can be expressed by [Equation 5] below.

Here, τ is a time constant, which determines how quickly the equilibrium temperature Tm is reached, and is dependent on the contact characteristics between object 1 (eg, heat retainers 110) and object 2 (eg, contact 10). .

Therefore, when it is assumed that the contact characteristics can be maintained constant, the temperature change of object 1 (eg, heat retainers 110) and object 1 (eg, heat retainers 110) and object 2 during time t If the temperature difference of (for example, the contact object 10) is known, a numerical value correlating to the thermal diffusivity of object 1 and object 2 can be derived as shown in [Equation 6] below. In this embodiment, γ is defined as a thermal ejection rate correlation coefficient.

In the present invention, the heat retainers 110 constitute the object 1 and the contact object 10 constitute the object 2. Object 1 and object 2 as described above have an ideal contact structure in which they completely contact each other without gaps, and in an ideal environment in which heat loss with the surroundings does not occur, the time constant τ can be derived, and object 2 (e.g., contact object 10) The heat release rate of can be derived.

However, ideal contact between the heat retainers 110 and the contact object 10 is not feasible because the surface of general materials may have fine surface roughness. Therefore, in this embodiment, after the heat retainers 110 corresponding to object 1 contact the contact 10 corresponding to object 2, the temperature change of the heat retainers 110 and the contact between the heat retainers 110 and the contact ( 10), it is possible to derive the thermal emission rate correlation coefficient (γ) that reflects the effective thermal diffusivity of object 2 through the temperature difference. At this time, since the heat retainers 110 are formed with a thin thickness, a temperature change can be measured efficiently and quickly upon contact with the contact object 10 .

For reference, since the contact object 10 maintains an equilibrium with room temperature in a general environment, an environment capable of constantly measuring room temperature is provided. In this case, the portable thermal characteristics measuring device 100 may not be provided with the first unit measuring devices 100a and 100b and the second unit measuring devices 100a and 100b, but only a single number of unit measuring devices 100a and 100b. However, since the contact object 10 is not in equilibrium with room temperature or can be maintained at a low or high temperature state compared to room temperature, there is a need to measure the thermal characteristics of the contact object 10 even in that state.

However, although the portable thermal characteristics measuring device 100 may be provided with a plurality of unit measuring devices 100a and 100b, as described above, in this embodiment, it is provided with two unit measuring devices 100a and 100b, but the unit measuring devices 100a and 100b ) can be derived through the following [Equation 7] and [Equation 8], respectively, when the contact object 10 is in contact with the thermal ejection rate correlation coefficient (γ).

Here, T ₁ is the initial temperature of the first unit measuring device 100a, 100b, ΔT ₁ is the change temperature of the first unit measuring device during time t, e ₁ is the heat release rate of the first unit measuring device, and T ₂ Is the initial temperature of the second unit measuring device 100a, 100b, ΔT2 is the change temperature of the second unit measuring device 100a, 100b during time t, e ₂ is the heat release rate of the second unit measuring device 100a, 100b . At this time, To is the initial temperature of the contact object 10, and eo is the heat release rate of the contact object.

On the other hand, when the first heat retainer 110a and the second heat retainer 110b are made of the same material, since they are the same, the heat release rate correlation coefficient (γ) and To are Each can be derived through Equation 10].

In conclusion, when the portable thermal characteristics measuring device 100 of this embodiment is composed of a plurality of unit measuring devices 100a and 100b, the temperature and thermal characteristics of the contact object 10 can be simultaneously measured even for a very short time t .

4 to 8 are graphs showing experimental results of the portable thermal characteristics measuring device 100 shown in FIGS. 2 and 3, and FIG. 9 is a contact by the portable thermal characteristics measuring device 100 according to an embodiment of the present invention. FIG. 10 is a graph showing the result of measuring the temperature of the contact object 10 shown in FIG. 9 and the sense of warmth perceived by a person.

That is, in FIGS. 4 to 8, performance test results of the portable thermal characteristics measuring device 100 according to an embodiment of the present invention are shown as graphs. In addition, FIGS. 9 and 10 show graphs comparing the measurement results of the portable thermal characteristics measuring device 100 and a person's sense of temperature for the contact objects 10 made of 20 different materials.

Referring to FIG. 4 , as an actual product for the portable thermal characteristics measuring instrument 100 of this embodiment, the first and second heat retainers 110a and 110b may be composed of two aluminum plates. A thermocouple used as the temperature sensor 130 may be attached to an upper surface of the heat retainer 110 as described above with an aluminum tape. The thermal couple may be fixed with a material such as epoxy, but it is preferable to use thin aluminum tape having excellent thermal conductivity because it may act as an element that inhibits the response characteristics of the thermal couple. For reference, a non-covered thermocouple may be used for fast response characteristics.

4 shows the temperature change ( Solid line) is shown.

As for the contact method, contact was performed at a constant contact force and contact speed using a motorized stage. The dotted line represents the temperature of the aluminum plate measured by the temperature sensor 130 at a point away from the contact point.

4 shows an example of measurement 10 times, but since the blue point is separated from the contact point, even if contact is made, no significant temperature change occurs within a short time.

Referring to FIG. 5, FIG. 5 shows the correlation between the temperature change of the portable thermal characteristics measuring device 100 measured 50 times through the same method as in FIG. 4 and the initial temperature difference between the portable thermal characteristics measuring device 100 and the contact object 10. is a graph showing

The temperature change ΔT is a result value representing 0.3, 0.5, and 1.0 seconds after the contact point, respectively, and the temperature change (ΔT) of the portable thermal characteristics measuring instrument 100 and the ) can confirm the linear relationship between the initial temperature difference (Tsensor-Tobject). In particular, since the reliability of the linear relationship is very high, it can be seen that the relationship of [Equation 7] derived above is experimentally and accurately verified.

Referring to Figure 6, Figure 6 is a graph showing the results when the above experiment was conducted on natural cowhide and wool fabric. That is, the contact object 10 is an aluminum plate, natural cowhide, or wool fabric. At this time, in FIG. 6, while varying the temperature of the contact object 10 and the portable thermal characteristics meter 100, the portable thermal characteristics according to the contact The temperature change of the measuring device 100 can be measured 50 times.

The graph of FIG. 6 as described above shows the temperature change for 1 second after the portable thermal characteristic measuring instrument 100 comes into contact with the contact object 10 and the initial temperature of the portable thermal characteristic measuring instrument 100 and the contact object 10. It shows the relationship between the differences. As a result, it can be seen that a very high linear relationship appears in all three materials of the contact object 10, but it can be seen that the contact object 10 has different slopes depending on the material of the contact object 10.

That is, through the graph of FIG. 6, it can be experimentally confirmed that the thermal ejection rate correlation coefficient (γ) of [Equation 7] represents the unique thermal characteristics of the material.

Referring to FIG. 7 , FIG. 7 is a graph showing the change in the thermal ejection rate correlation coefficient (γ) measured while changing the magnitude of the contact force with respect to whether or not the heat retainer 110 is polished. At this time, the contact object 10 is an aluminum plate, and the 'warmth feature' described in FIG. 7 is the heat release rate correlation coefficient (γ) extracted 1 second after contact between the heat retainer 110 and the contact object 10. am.

Here, in the unpolished heat retainer 110, when the contact force is low, the magnitude of the thermal emission rate correlation coefficient (γ) is measured low, and as the contact force increases, the magnitude of the thermal emission rate correlation coefficient (γ) rapidly increases. increase can be seen.

On the other hand, in the polished heat retainer 110, it can be seen that the heat release rate correlation coefficient (γ) measured at a low contact force is not larger than the heat release rate correlation coefficient (γ) measured at a high contact force, and the contact force It can be experimentally confirmed that the thermal ejection rate correlation coefficient (γ) is easily saturated as this increases.

In [Equation 7], the characteristics and contact force of the contact surface are related to the time constant τ. In the case of the unpolished heat retainer, since it has fine surface roughness in the low contact force range, complete contact with the contact object 10 is not made, and as the contact force increases, the contact area increases due to fine surface deformation. The value of the time constant τ fluctuates greatly.

On the other hand, since it is not easy to control the contact force in an environment using the portable thermal characteristics measuring instrument 100, the fluctuation of the time constant τ value may increase according to the fluctuation of the contact force. Therefore, in order to improve the precision of the portable thermal characteristics measuring instrument 100, it can be confirmed experimentally that it is necessary to polish the contact portion 112 of the heat retainer 110 to minimize the variation of the time constant τ value due to the change in contact force.

Referring to FIG. 8, FIG. 8 shows experimental results by the contact force limiting member 140 of the portable thermal characteristics measuring instrument 100 as a graph. That is, the contact force limiting member 140 is composed of a first case 142, a second case 144, and an elastic body 146, as the first case 142 is inserted into the second case 144. The elastic body 146 plays a role of resistance when the first case 142 is inserted into it and also serves to restore the first case 142 to its original position.

When the second case 144 of the portable thermal characteristics measuring instrument 100 comes into contact with the contact object 10, the maximum depth at which the first case 142 and the heat retainer 110 are inserted into the second case 144 is Since it is determined, it can be experimentally confirmed that the contact force provided to the heat retainer 110 is constantly maintained as the limited contact force. The graph of FIG. 8 shows the change in the thermal ejection rate correlation coefficient (γ) measured according to the magnitude of the contact force in the portable thermal characteristics measuring device 100 of this embodiment.

At this time, the contact object 10 is an aluminum plate, and the warmth feature of FIG. 8 represents the value of the thermal ejection rate correlation coefficient (γ) extracted at a point in time 1 second after the contact. In FIG. 8, unlike FIG. 7, it can be seen that the value of the thermal emission rate correlation coefficient (γ) is saturated in the range of about 100 g. This is because the contact force does not increase beyond the limit contact force and is kept constant by the elastic body 146, the first case 142, and the second case 144. Through this, it can be experimentally confirmed that the thermal ejection rate correlation coefficient (γ) reflecting the thermal characteristics of the material can be constantly measured regardless of the contact force.

Referring to FIG. 9, in (a) of FIG. 9, 20 types of contacts 10 made of different types of materials are shown, and in (b) of FIG. The results of measuring the temperature of the contact objects 10 shown in FIG. 9(a) are graphed using .

Here, in (a) of FIG. 9, contact objects 10 made of 20 different materials are continuously disclosed. Among the 20 contact materials 10, a silk plain weave structure (#9) is presented as a reference sample representing coolness. In addition, a polyester dumble structure (#11) is presented as a reference sample representing warmth among 20 contact objects (10).

In addition, the "Warmth feature" described in (b) of FIG. 9 is a thermal ejection rate correlation coefficient (γ), and for a time of 1 second after contacting the portable thermal characteristics measuring instrument 100 with 20 contact objects 20, respectively. Set to the derived value. At this time, the thermal ejection rate correlation coefficient (γ) can be obtained by freely measuring the contact object 20 made of various materials by the user using the portable thermal characteristics measuring device 100 . The value of the heat release rate correlation coefficient (γ) as described above can be derived through the temperature change of the heat retainer 110 for 1 second after the portable thermal characteristics meter 100 and the contact object 10 come into contact. .

Referring to FIG. 10, FIG. 10 shows a graph showing a result of measuring a sense of warmth of the portable thermal characteristics measuring device 100 and a result of recognizing a person's sense of warmth. "Perceived human warmth" described in FIG. 10 is a result of human warmth perception, and is set as a value obtained by scoring the result of perception of warmth of the object 10 in contact using a psychological warmth questionnaire. For reference, an error bar indicating a 95% confidence interval is displayed in the graph of FIG. 10 .

For example, the psychological warmth survey is conducted on a large number of people, and 1 point of the reference sample representing coolness (eg, silk plain weave structure) and 7 points of reference sample representing warmth (eg, polyester) Dumble structure) was presented, and a survey was conducted to score the degree of warmth perceived by people for samples of 20 materials.

The graph of FIG. 10 as described above can match the sense of warmth measured by the portable thermal characteristic meter 100 and the sense of warmth perceived by a person, and can be used to determine the material of the unknown contact object 10 . As a result, when matching the heat release rate correlation coefficient (γ) measured by the portable thermal characteristic measuring device 100 and the score of the sense of warmth perceived by a person for the contact object 10 made of various materials, It can be seen that the degree of warmth and the heat release rate correlation coefficient (γ) have a high correlation with each other. Therefore, it is possible to measure the unique thermal characteristics of the material of the contact object 10 using the portable thermal characteristics measuring device 100, and through this, it is possible to infer the sense of warmth perceived by a person.

As described above, the embodiments of the present invention have been described with specific details such as specific components and limited embodiments and drawings, but these are provided only to help a more general understanding of the present invention, and the present invention is limited to the above embodiments. It is not, and those skilled in the art can make various modifications and variations from these descriptions. Therefore, the spirit of the present invention should not be limited to the described embodiments and should not be determined, and all things equivalent or equivalent to the claims as well as the following claims belong to the scope of the present invention.

100: portable thermal characteristics meter
110: heat retainer
120: heater
130: temperature sensor
140: contact force limiting member
142: first case
144: second case
146: elastic body
148: pressure sensor
150: control unit
10: contact

Claims (10)

A heat retainer in contact with a contact object for recognizing a sense of warmth;
a heater disposed on one side of the heat retainer to provide heat to the heat retainer;
a temperature sensor disposed on the other side of the heat retainer to measure the temperature of the heat retainer; and
a contact force limiting member for limiting the contact force to the limited contact force and keeping it constant when the contact force between the heat retainer and the contact becomes greater than a preset limit contact force when the heat retainer is brought into contact with the contact object;
Portable thermal characteristics measuring instrument comprising a.
According to claim 1,
Further comprising a control unit for measuring thermal characteristics and temperature of the contact through a detection result of the temperature sensor when the heat retainer and the contact are in contact with each other,
The heat retainer, the temperature sensor, and the heater are provided in plurality, and the heat retainers are simultaneously contacted with the contact object while being maintained at different temperatures,
The control unit measures the thermal characteristics and temperature of the contact object before the heat retainers and the contact object reach thermal equilibrium using temperature changes of the temperature sensors when the contact object contacts the heat retainers. Characterized by a portable thermal characteristics measuring instrument.
According to claim 1 or 2,
The contact force limiting member,
a first case in which the other end of the heat retainer is fixed such that one end of the heat retainer protrudes toward the contact object;
a second case movably coupled to the outside of the first case so that one end of the heat retainer protrudes toward the contact object at a preset height; and
an elastic body provided between the second case and the first case, elastically deforming when one end of the heat retainer comes into contact with the contact object and setting the contact force between the heat retainer and the contact object to be less than or equal to the limiting contact force;
A portable thermal characteristics measuring instrument comprising a.
According to claim 3,
The contact force limiting member,
a pressure sensor provided between the elastic body and the second case to measure a contact force between the heat retainer and the contact object;
A portable thermal characteristics measuring instrument further comprising a.
According to claim 3,
A contact portion for contacting the contact object is formed at one end of the heat retainer,
The contact part finely improves surface roughness through surface processing to increase the contact area with the contact object,
The temperature sensor is disposed at a location spaced apart from the heater so as to measure the temperature of the contact portion without being affected by the heat of the heater, and is disposed closer to the contact portion than the heater. Portable thermal characteristics measuring device.
According to claim 3,
The heat retainer is provided with a preset thin thickness so that the temperature change proceeds rapidly when in contact with the contact object,
The temperature sensor is disposed at one end of the heat retainer, and the heater is disposed at the other end of the heat retainer,
A portable heat characterized in that a bent portion corresponding to the surface shape of the first case is provided between one end and the other end of the heat retainer to position the first case on a straight line distance between the temperature sensor and the heater. characteristic meter.
According to claim 3,
The second case is moved along the first case until it comes into contact with the contact object by an external force upon contact between the heat retainer and the contact object;
The heat retainer and the first case are portable thermal characteristics measuring instruments, characterized in that accommodated inside the second case in a state in which the contact force of the heat retainer and the contact object is constant.
According to claim 3,
The elastic body is provided with any one of a spring member or a silicon member,
A portable thermal characteristics measuring instrument, characterized in that a gap is formed inside the silicon member to facilitate elastic deformation of the silicon member.
According to claim 2,
A portable thermal characteristics measuring device, characterized in that in one of the heat retainers, only the temperature sensor is disposed without the heater being disposed to have the same temperature as the contact object.
According to claim 2,
The heat retainers include a first heat retainer and a second heat retainer disposed to be spaced apart from each other,
The first heat retainer and the second heat retainer have different initial temperatures (T ₁ , T ₂ ), but are formed of the same material and have the same heat release rates (e ₁ , e ₂ ),
The control unit derives a thermal emission rate correlation coefficient (γ) reflecting the initial temperature (To) of the contact object and the thermal diffusivity of the contact object using the following formula, and uses the thermal emission rate correlation coefficient (γ). A portable thermal characteristics measuring device, characterized in that for calculating the heat release rate (e ₀ ) of the contact material.

Here, t is the contact time, τ is a time constant, T ₁ is the initial temperature of the first thermal oil, ΔT ₁ is the temperature change of the first thermal oil over time t, and T ₂ is the second thermal oil is the initial temperature of the delay, ΔT ₂ is the temperature change of the second heat retainer according to time t, e ₁ is the heat release rate of the first heat retainer, e ₂ is the heat release rate of the second heat retainer , e ₀ is the thermal release rate of the contact material.

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