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KR-102964344-B1 - Chart Unit for Performance Inspection of Thermal Imaging Camera

KR102964344B1KR 102964344 B1KR102964344 B1KR 102964344B1KR-102964344-B1

Abstract

The present invention relates to a chart unit for performance testing of a thermal imaging camera, comprising a plurality of test units and a base area that blocks heat conduction composed of an insulator, wherein each of the plurality of test units includes a chart that includes an inspection pattern and is exposed toward the thermal imaging camera; a heat conductor formed on one surface of the chart to perform heat conduction, a thermoelectric element formed on one surface of the heat conductor to control the temperature of the heat conductor, and a heat dissipation device formed on one surface of the thermoelectric element to release heat generated from the thermoelectric element. The present invention can provide a chart unit for performance testing of a thermal imaging camera at a low cost by utilizing a plurality of test units.

Inventors

  • 강성관

Assignees

  • (주) 캔랩

Dates

Publication Date
20260513
Application Date
20250915

Claims (10)

  1. In a chart unit for performance testing of a thermal imaging camera, Multiple test units; and A base region composed of an insulator to block heat conduction; including, Each of the above plurality of test units is, A chart including an inspection pattern and exposed toward the thermal imaging camera; A heat conductor formed on one side of the above chart and performing heat conduction; A thermoelectric element formed on one surface of the above-mentioned thermal conductor to control the temperature of the above-mentioned thermal conductor; and A heat dissipation device formed on one surface of the thermoelectric element to release heat generated from the thermoelectric element; comprising It is composed of an insulator and further includes a heat conduction blocking region that blocks heat generated from the thermoelectric element so as not to be released in the direction of view of the thermal imaging camera, The above-mentioned heat conduction blocking region is located between the case and the thermoelectric element, and is positioned on the side of the heat conductor to surround the heat conductor. The above case is an outer frame that encloses the chart, the thermal conductor, the thermoelectric element, the heat dissipation device, and the thermal conduction blocking region, and The above case includes an exposed area so that the thermal imaging camera can photograph the chart, and the chart is placed in the exposed area, and The above background area is the remaining area of the chart unit excluding the area where the plurality of test units are installed, and is composed of an insulator that does not conduct heat, the chart unit.
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  4. In Article 1, A chart unit characterized in that the thermoelectric element comprises at least one Peltier.
  5. In Article 1, A chart unit characterized by the above heat dissipation device including a heat sink formed on one surface of the thermoelectric element and a cooling fan formed on one surface of the heat sink.
  6. In Article 1, A chart unit characterized in that the plurality of test units are all set to the same temperature.
  7. In Article 1, A chart unit characterized in that the charts of the plurality of test units all have the same inspection pattern.
  8. In Article 1, A chart unit characterized in that the plurality of test units are positioned in at least five major areas within the entire field detected by the thermal imaging camera.
  9. In Article 1, A chart unit characterized in that the number or placement location of the plurality of test units is determined according to the field of view, focal length, field-specific inspection area, or inspection item of the thermal imaging camera.
  10. In Article 1, A chart unit characterized in that the above-mentioned heat conductor is a material of copper, gold, silver, or aluminum.

Description

Chart Unit for Performance Inspection of Thermal Imaging Camera The present invention relates to a chart unit for performance testing of a thermal imaging camera, and more specifically, to a chart unit for performance testing of narrow-angle and medium-angle thermal imaging cameras and a method of operating the chart unit. A thermal imaging camera detects infrared radiation energy emitted from an object, converts it into an electrical signal, and visually represents the temperature distribution on the screen by processing the electrical signal into an image. In this case, the performance of a thermal imaging camera is evaluated based on 1) precision (accuracy) of temperature detection, 2) sensitivity (NETD), 3) spatial resolution of the image, and 4) representation of the uniformity of the temperature distribution. In particular, the ability of a thermal imaging camera to accurately measure the actual temperature and display it without distortion is considered an essential performance indicator. One of the most common performance testing methods for thermal imaging cameras is to use a blackbody capable of maintaining an accurate reference temperature, have the camera photograph the blackbody, and then check how closely the temperature displayed on the screen matches the actual blackbody temperature. Blackbodyes have an emissivity of 0.99 or higher and emit infrared radiation almost perfectly, making them very advantageous for providing a reference temperature source. However, if a blackbody with an area large enough to cover the entire Field of View (FOV) of a thermal imaging camera is manufactured, the size and cost of the blackbody device increase exponentially. Conventional thermal imaging cameras have a field of view ranging from 30 to 60 degrees, and if a certain inspection distance is required, a large blackbody capable of maintaining a very wide and uniform temperature is necessary to cover the entire area within that field of view. Such large blackbodys cause problems such as complexity in the heat source control system, difficulties in ensuring precision, and increased manufacturing costs. Therefore, a chart unit is required to inspect the performance of the thermal imaging camera without the need for high-cost large blackbody units. FIG. 1 is a drawing for explaining a method for inspecting the performance of a thermal imaging camera according to an embodiment of the present invention. FIGS. 2 and FIGS. 3 are drawings for explaining a chart unit according to an embodiment of the present invention. FIGS. 4 to 7 are drawings for explaining a test unit according to an embodiment of the present invention. Figure 8 is a diagram illustrating the field of a thermal imaging camera. FIG. 9 is a drawing for explaining the pattern of a chart according to one embodiment of the present invention. In the following, embodiments related to the present invention are illustrated in the drawings and described in detail through the detailed description. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. In describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the component from other components, and the essence, order, or sequence of the component is not limited by such terms. Furthermore, where it is stated in this specification that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "coupled," or "connected" between each component. In the case of "connection," "coupled," or "connected," it may be understood not only as being physically "connected," "coupled," or "connected," but also, if necessary, electrically "connected," "coupled," or "connected." Terms such as "~part (unit)," "~device," "~part," and "~module" as used in this specification refer to a unit that processes at least one function or operation, and may be implemented in hardware, software, or a combination of hardware and software. Furthermore, terms such as "include," "compose," or "have" as used in this specification, unless specifically stated otherwise, mean that the relevant component may be inherent; therefore, they should be interpreted as allowing for the inclusion of additional components rather than excluding other components. Furthermore, it is intended to clarify that the classification of components in this specification is merely based on the primary function each component is responsible for. That is, two or more components described below may be combined into a single component, or a single component may be divided into two