KR20110049996A - Temperature control apparatus of black body and controlling metheod using the same - Google Patents

Abstract

PURPOSE: A temperature controller of a black body and a control method thereof are provided to efficiently cool and heat a black body since a temperature compensating board is connected to a dual structure of a Peltier element. CONSTITUTION: A temperature controller of a black body comprises a black body(2), a first Peltier element(10), a copper plate(30), a second Peltier element(20), a heat transfer member(40), and a controller(50). The black body emits the radiation energy of an infrared area. The first Peltier element is contiguous to the black body. The first Peltier element comprises a first a-side and a first b-side which can absorb and emit heat. The copper plate is contiguous to the first b-side. The second Peltier element comprises a second a-side and a second b-side which can absorb and emit heat. The second 2 b-side of the second Peltier element is contiguous to the copper plate. The heat transfer member comprises a bent side(42) and an arm expended to both ends of the black body.

Description

Temperature Control Apparatus and Control Method of Black Body {Temperature Control Apparatus of Black Body and Controlling Metheod using the same}

The present invention relates to a temperature control device for a black body and a control method thereof, and more particularly, to a temperature control device for a black body using a Peltier element and a control method thereof.

A black body is used to test the thermal camera and to perform temperature calibration. A blackbody is an object with an emissivity of approximately 1, which emits almost 100% of its energy. Inside the thermal camera there is a detector that detects the black body. The detector consists of a sensor array consisting of a number of detection sensors. For example, one detector consists of a sensor array of 320 horizontal x 240 vertical, or 76,800 sensors, which is commonly referred to as a focal plane array. It is called).

However, each sensor constituting the sensor array shows a slight variation in its performance for each sensor due to errors in the manufacturing process. In particular, the thermal detector has such a large phenomenon (non-uniformity of performance) so that the difference in the performance of each sensor is so great that it hardly recognizes the image when constructing the actual electronic circuit. To compensate for these characteristics in advance, there is a need for a device that compensates for the different performance of each sensor in the thermal camera by using the ambient temperature and the temperature of the blackbody source so that almost constant performance can be obtained through the process.

In Korea, it is common to import military thermal equipment and health care thermal equipment, which are technologies not activated to the private sector in the defense and industrial special fields, and there is no development of measurement and analysis standard equipment of thermal equipment in developing software suitable for the user environment. It is a state.

Overseas, there are SBIR company in USA, CI company in Israel, MICRON company in Europe, and cheaply produced products in China. However, the most technologically advanced company is SBIR company in the United States, which develops and sells various black bodies. The black body of the stable vacuum package is not applied.

Since domestic and overseas products are not actively developing technology for temperature correction, there is a problem that false errors occur in the measured values because the error cannot be corrected. Therefore, it is necessary to develop a technology for temperature correction and performance evaluation of a thermal camera that converts a difference in radiant energy of an infrared region into a visible light image that can be seen by a human.

The present invention is to solve the above problems, the present invention is to provide a temperature control device and a control method of the black body is formed uniformly the temperature distribution of the black body.

It is another object of the present invention to provide a temperature control method of a black body capable of photographing a black body with a thermal camera by changing the temperature of the black body to a desired temperature, and a control method thereof.

In order to achieve the above object, the present invention provides a black body for emitting radiation energy in the infrared region; A first Peltier element mounted adjacent to the black body and having a first a surface and a first b surface to selectively release or absorb heat; A copper plate adjacent to the first b surface; A second Peltier element having a second a surface and a second a surface to selectively release or absorb heat, wherein the second b surface is adjacent to the copper plate; A heat transfer member having a bent surface disposed adjacent to the second a surface and arms extending adjacent to both ends of the black body; And a controller configured to control the second a surface to simultaneously absorb heat when the first a surface emits heat, and simultaneously absorb the heat when the first a surface absorbs the heat. To provide.

In particular, when the black body is to be cooled, the temperature T2 of the second a surface is lower than the temperature T1 of the first a surface, and when the black body is to be heated, the temperature T2 of the second a surface is greater than the temperature T1 of the first a surface. High is preferred.

Furthermore, a through hole is formed in the center of the second Peltier element, and may further include a heat dissipation member contacting the copper plate to discharge heat generated from the copper plate.

The heat dissipation member may include a heat dissipation plate connected to the copper plate, and the heat dissipation plate may be heat-cooled by water cooling or air cooling.

In another aspect, the present invention is the first step of measuring the temperature of the black body emitting radiation energy in the infrared region; A second step of determining whether the temperature measured in the first step is higher or lower than a desired set temperature; And when determined to be low in the second step, releases heat from a second a-plane of the second Peltier element installed adjacent to a heat transfer member having a first a-plane adjacent to the black body and an arm adjacent to both ends of the black body, And a third step of absorbing heat from the first a surface adjacent to the black body and the second a surface if determined to be high in the second step. It provides a temperature control method characterized in that by adjusting.

In particular, when heat is released from the first a surface, the temperature T1 of the first a surface is lower than the temperature T2 of the second a surface, and if the heat is absorbed from the surface of the first a surface, the temperature T1 of the first a surface is the It is preferable that it is higher than the temperature T2 of 2nd a surface.

According to the present invention, the calibration technique can be applied to the performance reliability evaluation equipment of the thermal imaging camera for front surveillance, semiconductor wiper block performance tester, thermal conduction analysis in non-destructive field, thermal diagnostic medical device, and infrared ray-mounted optical system. It can be secured.

In the present invention, in the heating and cooling of the black body, the Peltier element is a dual structure to increase the cooling efficiency and reduce the deviation between the temperature of the central part and the temperature of the outer part so as to have a uniform temperature distribution of a large area in the black body. By connecting the temperature compensation plate of the Peltier element dual structure, it can be efficiently heated and cooled together with the black body and can be miniaturized.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

1 is a conceptual diagram illustrating a manner in which the Peltier device of the present invention is installed. For reference, FIG. 1 is a general diagram, and thus specific shapes such as through holes are not disclosed.

In general, a Peltier device has a thermoelectric element composed of a semiconductor in which N-type impurity ions are mixed or a semiconductor in which P-type impurity ions are mixed, and electrodes formed of copper plates or the like are joined to upper and lower sides of the thermoelectric element, respectively. A ceramic substrate is attached to surround the electrode.

In this Peltier element, when the current is applied to the junction, electrons in the N-type semiconductor move to the lower electrode while holes move from the upper electrode to the lower electrode, and the upper part takes heat away and cools down. Peltier effect is generated that the lower part is heated. In other words, the Peltier effect is one of the electric phenomena, and when a current flows through two different metals, heat generation or absorption occurs at the connection point.

Therefore, when a current is applied to the Peltier element, one side of the Peltier element forms a heat absorbing surface having a low temperature, and the other side forms a heat generating surface having a high temperature.If the current is applied in a reverse direction, the heat absorbing surface and the heat generating surface are different. Will change.

In the present invention, as shown in FIG. 1, the first peltier element 10 and the second peltier element 20 are arranged, and a copper plate is disposed between the first peltier element 10 and the second peltier element 20. 30 is located.

The first Peltier element 10 includes a first a surface 12 and a first b surface 14 capable of selectively dissipating heat or absorbing heat, and the second Peltier element 20 selectively heats. And a second a surface 22 and a second b surface 24 capable of emitting or absorbing heat.

In particular, in the present invention, the first a surface 12, the first b surface 14, the second b surface 24, and the second a surface 22 are sequentially arranged from the left side, and the exothermic reaction is performed on the first a surface 12. If it is made, the exothermic reaction occurs on the second a surface 22, and when the endothermic reaction occurs on the first a surface 12, the endothermic reaction also occurs on the second a surface 22.

2 is a conceptual diagram illustrating a temperature control apparatus of an air-cooled black body according to the present invention. A description with reference to FIG. 2 is as follows.

The temperature control apparatus of the black body according to the present invention includes a black body 2 emitting radiation energy in the infrared region, a first Peltier element 10 mounted adjacent to the black body 2, and adjacent to the first b surface 14. A copper plate 30, a second Peltier element 20 adjacent to the copper plate 30, and a heat transfer member 40 installed adjacent to the second a surface 22 are included.

In addition, in the present invention, when the first a surface 12 emits heat, the second a surface 22 simultaneously releases heat, and when the first a surface 12 absorbs heat, the second a surface 22 also The control unit 50 further controls to absorb heat at the same time. In other words, when the first b surface 14 emits heat, the control unit 50 also emits heat, and when the first b surface 14 absorbs heat, the second b surface ( 24 also controls to absorb heat at the same time.

The heat transfer member 40 includes a bent surface 42 adjacent to the second a surface 22, and includes an arm 44 connected to the bent surface 42. The arm 44 extends adjacent to both ends of the black body 2 and is transferred from the second a surface 22 to the bent surface 42, and again from the bent surface 42 to the arm 44. The heat transferred to the black body (2) can be transferred.

Meanwhile, a through hole 26 is formed in the center of the second Peltier element 20. The through hole 26 may be provided with a heat radiating member 27 in contact with the copper plate 30 to discharge heat generated from the copper plate 30. When the temperature of the copper plate 30 is higher than the external temperature, the heat dissipation member 27 is heated to discharge the temperature of the copper plate 30 to the outside, when the temperature of the copper plate 30 is lower than the external temperature The heat dissipation member 27 may cool and supply heat to the copper plate 30.

In FIG. 2, the heat sink 28 may be mounted at one end of the heat radiating member 27 to exchange heat with the outside, and the heat sink 28 may be provided with a plurality of heat radiating fins. The heat sink 28 is provided with a fan 60 so that the heat exchange in the heat sink 28 in an air-cooled manner.

Since the heat exchange by the heat sink 28 and the fan 60 is the same as the principle of a general heat exchanger (heat exchanger), a detailed description thereof will be omitted.

On the other hand, the control unit 50 may adjust the driving of the fan 60, thereby improving the efficiency of heat exchange in the heat sink (28). For example, when the temperature of the heat sink 28 is higher or lower than room temperature, the fan 60 may be driven to facilitate heat exchange.

That is, the controller 50 controls the direction of the current flowing through the first Peltier element 10 and the second Peltier element 20 to heat or cool the black body 2 and to control the fan 60. Thus, the heat transferred to the copper plate 30 may be heat-exchanged with the outside.

3 is a conceptual diagram illustrating a temperature control apparatus of a water-cooled black body according to the present invention. In FIG. 3, unlike the embodiment shown in FIG. 2, heat exchange is performed by water, and the rest of the structure is the same. Hereinafter, a difference from FIG. 2 will be described with reference to FIG. 3.

The heat sink 28 may be adjacent to the receiving portion 62 which is circulated while receiving water to allow heat exchange. Since the heat exchange between the heat sink 28 and the receiving portion 62 is the same as that of the general heat exchanger, a detailed description thereof will be omitted.

Unlike the example illustrated in FIG. 2, the controller 50 may control the flow rate or flow rate of the cooling water, that is, the water, in the accommodating part 62. That is, when the temperature of the heat sink 28 is higher or lower than room temperature or when heat exchange needs to be made quickly, the heat exchange is controlled to be smoothly performed between the accommodating part 62 and the heat sink 28. .

4 is a flowchart of a temperature control method of a black body according to the present invention. A description with reference to FIG. 4 is as follows.

Sensors installed in thermal cameras are difficult to measure accurately due to sensor characteristics or external factors. Therefore, by changing the temperature of the black body to measure the energy emitted from the black body to perform the calibration or compensation of the sensors.

First, set the temperature you want to measure using the thermal camera. At this time, if the temperature to be measured in the thermal camera is various, the set temperature has a number of values. In general, when the thermal camera is to be corrected, it is possible to set a plurality of values within the range of -10 ° C to 70 ° C.

The temperature of the black body 2 is measured (S10).

Then, the measured temperature of the black body 2 is compared with the set temperature (S20).

If the measured temperature is higher than the set temperature (S30), it is necessary to cool the temperature of the black body 2 by the set temperature (S42). Accordingly, the controller 50 may control the first Peltier element so that the first a surface 12 of the first Peltier element 10 and the second a surface 22 of the second Peltier element 20 act as an endothermic surface. 10) and a current is applied to the second Peltier element 20. At this time, the first b surface 14 of the first Peltier element 10 and the second b surface 24 of the second Peltier element 20 naturally act as heat generating surfaces to increase the temperature.

Since the temperature T1 of the first a surface 12 is lowered, the black body 2 adjacent to the first a surface 12 is cooled. At this time, the temperature of the black body 2 is generally lower than the temperature at both ends. That is, the temperature distribution of the black body 2 forms a distribution of a two-dimensional curve that is approximately lowered in the center. Because more air and convection may occur at both ends of the black body 2 and at both ends of the first a surface 12 than in the middle, and unlike the theoretical value, in fact, the cooling effect is also provided at the first a surface 12. Is not the same in all parts.

The temperature T2 of the second a surface 22 is set lower than the temperature T1 of the first a surface 12 (S44). The temperature of T2 is transmitted to the bent surface 42 adjacent to the second a surface 22, and since the bent surface 42 is connected to the arm 44 to allow heat transfer, substantially the temperature of T2 is Delivered to arm 44. Since the arm 44 is adjacent to both ends of the black body 2, both ends of the black body 2 are cooled by the arm 44. Furthermore, since the temperature of T2 is lower than that of T1, both ends of the black body 2 are cooled lower than the temperature T1 by the first a surface 12 by T2, so that the temperature of the black body 2 is at both ends and the center. Can be corrected constantly.

On the other hand, the first b surface 14 and the second b surface 24 generate heat. The heat generated here is transferred to the copper plate 30, the heat of the copper plate 30 is transferred to the heat sink 28 connected to the heat dissipation member 27, the fan 60 or the receiving portion 62 The heat exchange takes place in the air-cooled or water-cooled manner.

If heat is not discharged to the outside by the copper plate 30, the black body 2 is difficult to cool as much as desired due to the heat generated from the first b face 14 and the second b face 24. Although not clearly disclosed in the drawings of the present invention, the first Peltier element 10 and the second Peltier element 20 are enclosed in one case, and the first b surface 14 and the second b surface. This is because heat by (24) can affect the first a surface 12 and the second a surface 22.

If the measured temperature is lower than the set temperature, it is necessary to heat the temperature of the black body 2 by the set temperature (S52). Accordingly, the controller 50 may control the first Peltier element so that the first a surface 12 of the first Peltier element 10 and the second a surface 22 of the second Peltier element 20 serve as a heating surface. 10) and a current is applied to the second Peltier element 20. At this time, the first b surface 14 of the first Peltier element 10 and the second b surface 24 of the second Peltier element 20 naturally act as an endothermic surface to lower the temperature.

Since the temperature T1 of the first a surface 12 increases, the black body 2 adjacent to the first a surface 12 is heated. At this time, the temperature of the black body 2 is generally higher than the temperature at both ends. In other words, the temperature distribution of the black body 2 forms a distribution of a two-dimensional curve that is approximately increased in the center. Because more air and convection may occur at both ends of the black body 2 and at both ends of the first a surface 12 than in the middle, and unlike the theoretical value, the heating effect is actually generated at the first a surface 12 as well. Is not the same in all facets.

The temperature T2 of the second a surface 22 is set higher than the temperature T1 of the first a surface 12 (S44). The temperature of T2 is transmitted to the bent surface 42 adjacent to the second a face 22, and since the bent surface 42 is connected to the arm 44, the temperature of T2 is substantially the arm 44. Is passed on. Since the arm 44 is adjacent to both ends of the black body 2, both ends of the black body 2 are heated by the arm 44. Furthermore, since the temperature of T2 is higher than that of T1, both ends of the black body 2 are heated by the temperature of T2, so that the temperature of the black body 2 can be uniformly corrected at both ends and the center. Thus, the heat distribution can be approximately straight rather than quadratic.

On the other hand, the first b surface 14 and the second b surface 24 are cooled. The lowered temperature is transmitted to the copper plate 30, and the copper plate 30 is connected to the heat dissipation member 27 and is transferred to the heat dissipation plate 28 by the fan 60 or the accommodating part 62. The heat exchange takes place in an air or water cooling manner.

If the temperature lowered by the copper plate 30 does not heat exchange with the outside, the first a surface 12 and the second b surface 24 affect the first a surface 12 and the second a surface 22. Since the black body 2 is hardly heated as desired.

In order to compensate for various temperatures in the thermal imaging camera, the above-described process may be performed while varying the set temperature of the black body.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

1 is a conceptual diagram showing the manner in which the Peltier device of the present invention is installed.

2 is a conceptual diagram showing a temperature control apparatus of an air-cooled black body according to the present invention.

3 is a conceptual diagram showing a temperature control apparatus of a water-cooled black body according to the present invention.

4 is a flow chart of the temperature control method of the black body according to the present invention.

<Description of Signs for Main Parts of Drawings>

2: black body 10: first Peltier element

20: second Peltier element 30: copper plate

40: heat transfer member 50: control unit

Claims (7)

A black body that emits radiant energy in the infrared region; A first Peltier element mounted adjacent to the black body and having a first a surface and a first b surface to selectively release or absorb heat; A copper plate adjacent to the first b surface; A second Peltier element having a second a surface and a second a surface to selectively release or absorb heat, wherein the second b surface is adjacent to the copper plate; A heat transfer member having a bent surface disposed adjacent to the second a surface and arms extending adjacent to both ends of the black body; And And a controller configured to simultaneously control the second a surface when the first a surface emits heat and simultaneously absorb the heat when the first a surface absorbs the heat. The method of claim 1, When the black body is to be cooled, the temperature control device of the black body, characterized in that the temperature T2 of the second a surface is lower than the temperature T1 of the first a surface. The method of claim 1, When the black body is to be heated, the temperature control device of the black body, characterized in that the temperature T2 of the second a surface is higher than the temperature T1 of the first surface a. The method of claim 1, A through hole is formed in the center of the second Peltier element, And a heat dissipation member in contact with the copper plate and dissipating heat generated from the copper plate. The method of claim 4, wherein The heat dissipation member has a heat dissipation plate connected to the copper plate, The heat sink is a temperature control device of the black body, characterized in that the heat exchange is water-cooled or air-cooled. A first step of measuring the temperature of the black body emitting radiant energy of the infrared region; A second step of determining whether the temperature measured in the first step is higher or lower than a desired set temperature; And If it is determined in the second step, the heat is discharged from the second peltier element of the second Peltier element installed adjacent to the heat transfer member having a first a surface adjacent to the black body and the arm adjacent to both ends of the black body, And a third step of absorbing heat from the first a surface adjacent to the black body and the second a surface if determined to be high in the second step. And controlling the temperature of the black body by the temperature of the first a surface and the second a surface. The method of claim 6, When heat is released from the first a surface, the temperature T1 of the first a surface is lower than the temperature T2 of the second a surface, When heat is absorbed from the first surface, the temperature T1 of the first surface is higher than the temperature T2 of the surface of the second surface.

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