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초음파 펄스 서모그라피를 이용한 세라믹 전열 판의 결함 검출
조재완,서용칠,정승호,김승호,정현규,Cho, Jai-Wan,Seo, Yong-Chil,Jung, Seung-Ho,Kim, Seung-Ho,Jung, Hyun-Kyu 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.4
The applicability of UPT (Ultrasound Pulse Thermography) for real-time defect detection of the ceramic heating plate is described. The ceramic heating plate with superior insulation and high radiation is used to control the water temperature in underwater environment. The underwater temperature control system can be damaged owing to the short circuit, which resulted from the defect of the ceramic heating plate. A high power ultrasonic energy with pulse duration of 280 ms was injected into the ceramic heating plate in the vertical direction. The ultrasound excited vibration energy sent into the component propagate inside the sample until they were converted to the heat in the vicinity of the defect. Therefore, an injection of the ultrasound pulse wave which results in heat generation, turns the defect into a local thermal wave transmitter. Its local emission is monitored and recorded via the thermal infrared camera at the surface which is processed by image recording system. Measurements were Performed on 4 kinds of samples, composed of 3 intact plates and the defect plate. The observed thermal image revealed two area of crack in the defective ceramic heating plate.
칼라 CCD 영상을 이용한 고휘도 LED 전구의 빔 열화 분석
조재완(Jai-Wan Cho),최영수(Young-Soo Choi),이재철(Jae-Chul Lee),구인수(In-Soo Koo),홍석붕(Seok-Boong Hong) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.6
VLC (Visible Light Communication) is a wireless communication method using light that is visible to the human eye. It has a major advantage that it causes no interference to RF-based devices. This makes wireless communication possible in RF hazardous areas such as nuclear facilities. In order to apply VLC communication in harsh environment of nuclear power plant, the high luminance LEDs, which are key components of the VLC communication, have been gamma-ray irradiated at the dose rate of 4 kGy/h during 72 hours up to a total dose of 288 kGy. The radiation induced color-center was formed in the LED housing cap made of transparent plastic or acryl material. The beam degradations of high luminance LEDs by high dose-rate gammaray irradiation are analyzed using color CCD image processing technology.
적외선 열영상을 이용한 가시광 통신모듈의 고선량 감마선조사에 따른 열화 분석
조재완(Jai-Wan Cho),홍석붕(Seok-Boong Hong),구인수(In-Soo Koo) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.12
In this paper, the degradation evaluation method of VLC (Visible Light Communication) wireless module after high dose rate gamma-ray irradiation using the thermal infrared camera is proposed. First, the heating characteristics of the active devices embedded in the VLC wireless module during the condition of normal operation is monitored by thermal infrared camera. By the image processing technique, the trends of the intensity of the heat emitted by the active devices are calculated and stored. The feature of the blob area including the area of the active devices in the thermal infrared image is extracted and stored. The feature used in this paper is the mean value of the gray levels in the blob area. The same VLC module has been gamma irradiated at the dose rate of about 4.0 kGy/h during 72 hours up to a total dose of 288 kGy. And then, the heating characteristics of the active devices embedded in the VLC wireless module after high dose gamma ray irradiation is observed by thermal infrared camera. The high dose gamma-ray induced degradation of the active devices embedded in the VLC module was evaluated by comparing the mean value of the blob area to the one of the same blob area of the VLC module before the gamma ray irradiation.
조재완(Jai-Wan Cho),이준구(Joon-Koo Lee),허섭(Seop Hur),구인수(In-Soo Koo),홍석붕(Seok-Boong Hong) 대한전기학회 2009 전기학회논문지 Vol.58 No.7
Assumed that an IPTV camera system is to be used as an ad-hoc sensor for the surveillance and diagnostics of safety-critical equipments installed in the in-containment building of the nuclear power plant, an major problem is the presence of high dose-rate gamma irradiation fields inside the one. In order to uses an IPTV camera in such intense gamma radiation environment of the in-containment building, the radiation-weakened devices including a CCD imaging sensor, FPGA, ASIC and microprocessors are to be properly shielded from high dose-rate gamma radiation using the high-density material, lead or tungsten. But the passive elements such as mirror, lens and window, which are placed in the optical path of the CCD imaging sensor, are exposed to a high dose-rate gamma ray source directly. So, the gamma-ray irradiation characteristics of the passive elements, is needed to test. A CCD camera lens, made of glass material, have been gamma irradiated at the dose rate of 4.2 kGy/h during an hour up to a total dose of 4 kGy. The radiation induced color-center in the glass lens is observed. The degradation performance of the gamma irradiated lens is explained using an color component analysis.
조재완(Jai Wan Cho),박승규(Seung Kyu Park),백성훈(Seong Hoon Baik),최영수(Young Soo Choi),정경민(Kyung Min Jeong) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, monitoring performance of a range-gated imaging camera under visibility constraint environments is described.