• Korean Journal of Optics and Photonics
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• v.23 no.4
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• pp.154-158
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• 2012

In this paper, for low cost infrared optical equipment, we design and fabricate an infrared optical system for an uncooled detector using PGM(Precision Glass Molding) lenses. The designed infrared optical system has a good athermalization, and the material of all of its lenses is a chalcogenide glass suitable for the PGM method. In addition, we also fabricate the same infrared optical system using SPDT(Single Point Diamond Turning) lenses in order to measure the optical performance of PGM lenses. We measure the MTF(Modulation Transfer Function) of the two infrared optical systems which use the PGM lenses and the SPDT lenses. And then we compare and analyze the images of them both. As a result, we find that they have only a very small difference in optical performance. If the use of PGM lenses increases, we expect to reduce the cost of infrared optical equipment.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.1
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• pp.63-73
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• 2021

This paper presents a algorithm for automatic target recognition robust to the influence of the flame in order to track the target by EOTS(Electro-Optical Targeting System) equipped on UAV(Unmanned Aerial Vehicle) when there is aerial target or marine target with flame at the same time. The proposed method converts infrared images of targets and flames into a gradient vector field, and applies each gradient magnitude to a polynomial curve fitting technique to extract polynomial coefficients, and learns them in a shallow neural network model to automatically recognize targets and flames. The performance of the proposed technique was confirmed by utilizing the various infrared image database of the target and flame. Using this algorithm, it can be applied to areas where collision avoidance, forest fire detection, automatic detection and recognition of targets in the air and sea during automatic flight of unmanned aircraft.

• Korean Journal of Optics and Photonics
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• v.12 no.6
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• pp.460-462
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• 2001

We have analyzed the characteristics of IR lens mounting with elastomer and applied the results to the mounting of a silicon lens with diameter 117 mm which is the objective of a thermal imaging system. The elastomer, the 577 primerless silicone adhesive (Dow Corning Co.) which is heat cure type, and the mount material, A16061 are used for our analysis. Theoretical analysis gives the result that the space between lens and mount is required to be more than 250 ${\mu}{\textrm}{m}$ under the operational temperature conditions of -40~+6$0^{\circ}C$.

• Korean Journal of Optics and Photonics
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• v.27 no.1
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• pp.18-24
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• 2016

To effectively utilize a flash and predict its effects on an infrared device, it is essential to know the infrared characteristics of the flash source. In this paper, a study of the IR characteristics of flash light sources is carried out. The IR characteristics of three flash sources, of which two are combustive and the other is explosive, are measured with an IR characteristic measurement system over the middle- and long-wavelength infrared ranges. From the measurements, the radiances over the two IR ranges and the radiative temperatures of the flashes are extracted. The IR radiance of flash A is found to be the strongest among the three, followed by those of sources C and B. It is also shown that the IR radiance of flash A is about 10 times stronger than that of flash B, even though these two sources are the same type of flash with the same powder. This means that the IR radiance intensity of a combustive flash source depends only on the amount of powder, not on the characteristics of the powder. From the measured radiance over MWIR and LWIR ranges for each flashes, the radiative temperatures of the flashes are extracted by fitting the measured data to blackbody radiance. The best-fit radiative temperatures (equivalent to black-body temperatures) of the three flash sources A, B, and C are 3300, 1120, and 1640 K respectively. From the radiance measurements and radiative temperatures of the three flash sources, it is shown that a combustive source radiates more IR energy than an explosive one; this mean, in turn, that the effects of a combustive flash on an IR device are more profound than those of an explosive flash source. The measured IR radiances and radiative temperatures of the flash sources in this study can be used to estimate the effects of flashes on various IR devices, and play a critical role for the modeling and simulation of the effects of a flash source on various IR devices.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.432-435
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• 2009

This paper proposes a hand posture recognition with pattern-matching method, embedding a simple paradigm using an Infrared sensor array. Our pattern-matching based hand posture recognition is specification supports fun and the user experience when communicating between humans and telecommunication devices, including robots. Our non-contact type input device (IR-Sensor Array) transmits commands to control mobile robots. It can also control Google Earth’s map searching programs, and other applications.

• Korean Journal of Optics and Photonics
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• v.26 no.4
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• pp.187-194
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• 2015

A system of infrared camera optics with wide field of view and anamorphic lenses is proposed, and its validity verified through manufacture. The infrared camera produced provides a wide field of view of over 100 degrees in the horizontal direction, and an even greater magnification in the vertical direction. As a result, the system can have a wider surveillance range and improved detection ability at the same time. In addition, a new optomechanical automatic athermalization mechanism is proposed and applied to the infrared camera. Its performance and utility is proved through testing.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.478-482
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• 2010

최근 개발된 표면영상유속계(Surface Image Velocimetry, SIV)는 하천 표면의 영상을 분석하여 유속을 산정하는 매우 실용적이며 간편한 유속측정 방법이다. 그러나, 표면영상유속계는 수표면의 움직임을 계산하여 표면유속을 산정하기 때문에 야간의 경우 획득영상시 수표면의 움직임을 확인할 수 없어 유속측정이 어렵다는 단점이 있었다. 이 때문에 표면영상유속계의 간편성과 유용성에도 불구하고, 주간에만 유속측정이 가능하여 연속적인 하천유량측정을 하기 어려웠다. 과거 수표면에 야광 입자를 흘려보내면서 야간유속측정을 실시하였으나 대하천의 경우 야광 물질의 크기가 작아 영상내에서 식별이 어렵고, 측정시마다 야광 입자를 뿌려주어야 하기 때문에 환경적인 문제가 있다. 이에 본 연구에서는 적외선 카메라를 이용하여 야간에도 영상획득이 가능하도록 시스템을 개선하였다, 야간 영상획득 장비는 최대 가시거리가 200 m까지 가능하고, 주야간 모두 영상획득이 가능하도록 시스템을 구성하였다. 적외선 카메라에서 획득된 동영상은 초당 최대 30장까지 자동 분할이 가능하여 홍수시 고유속을 분석하기에 문제가 없도록 제작하였다. 이와 같이 제작된 야간유속측정 시스템을 이용하여 동일한 유속조건에 대하여 현장에서 주간과 야간 표면유속 측정의 정확도 분석을 수행한 결과 만족스러운 결과를 얻었으며, 향후 실제 하천유량측정에 적용하게 된다면 보다 간편하게 실시간으로 주야간 유량측정이 모두 가능할 것으로 기대된다.

• Proceedings of the KAIS Fall Conference
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• 2011.12a
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• pp.255-258
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• 2011

최근 스마트폰의 많은 공급으로 우리는 정보처리, 인터넷 검색 등 다양한 기능들을 언제 어디서든 편리하게 사용할 수 있게 되었다. 스마트폰 공급은 일상생활, 정보통신 분야 뿐만이 아닌 산업 분야에도 많은 변화를 주었다. 스마트폰은 적외선 리모콘으로 운영 할 수 없었던 산업 분야의 리모콘을 설계 및 구현 할 수 있도록 하였다. 본 논문은 스마트폰과 X-ray장비 간 블루투스 소켓 통신으로 스마트폰을 Master, X-ray시스템을 Slave로 하는 피코넷을 구성하여 X-ray장비의 Ceiling을 원격제어 가능하게 하였다. 스마트폰 어플리케이션과 블루투스를 사용하여 사용자가 X-ray 장비를 스마트폰으로 쉽게 운영 할 수 있음을 확인 하였다.

• Journal of Conservation Science
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• v.32 no.2
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• pp.215-221
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• 2016

This study conducted analysis of paint samples from defense industries equipments of Korean Conflict in The War Memorial of Korea to identify the characteristics of the modern paint. The samples were analyzed by microscopic observation, infrared spectroscopy and SEM-EDS. Cross-section of paint samples are made up of several layers of about 9 to 20 times, and thickness of the layer is not uniform in the $10{\sim}100{\mu}m$. The putty was used for the surface treatment before painting. Inorganic analysis showed that one type of the putty consist of minium and kaolin, talc, titanium dioxide. According to the results of infrared spectroscopy, paint samples were identified as alkyd resin. Some bands such as C-H bending, C-O and C-C stretching, C-H rocking were found in spectra.

• Journal of the Korea Society of Computer and Information
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• v.19 no.12
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• pp.31-37
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• 2014

In this paper, to compensate the degraded performance in high-resolution infrared sensor due to assembling error, the influence of each component was evaluated through the sensitivity analysis of lens assembly, axis mirror, and detector and also suggested detector tilt mechanism for compensation. 3 detector tilt mechanisms were investigated. The first one is 'Shim plate' method which is applying shim on installing plane. The second one is 'Tilting screw' method that is using tilt screw for adjusting detection plane. The last one is 'Micrometer head' method that is installing micrometer on detection plane and acquiring quantitative data. Based on the investigation result, 'Tilting screw' method was applied due to ease of user control, small volume, and real-time controllability, thereby we could acquire high-resolution infrared images. The research result shows that the tilting mechanism is necessary technology for the implementation of high-resolution infrared imaging system.