• 대한전자공학회논문지
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• 제22권3호
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• pp.68-76
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• 1985

전하 결함 소자를 이용한 16×16 이차원 영상 감지 소자가 제작되었다. 제작된 소자는 2상(two-Phase)의 전극 구조로 제작 되었고 프레임 이동(frame transfer) 방식으로 동작한다. 표면 전위차를 얻기위해 이온 주입을 했고 NMOS공정을 따라 제작되었다. 영상을 얻기위한 시스템은 광학 렌즈 클럭 발생 및 구동 회로, 계단형 신호 발생기로 이루어지는데, EPROM을 사용하여 클럭 발생회로를 간단하게 하였다. 영상 시스템을 사용하여 오실로스코프 화면에 알파베트를 표시할 수 있었다. 소자의 특성으로 전하 이동 손실률과 암전류를 측정하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.252-252
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• 2010

Carbon nanotubes(CNTs) have excellent electrical, mechanical and chemical properties. In this paper, the variation of charge density and resistivity in MWCNT gas sensor were defined by three Dimensional Finite element method, and an accurate description of equivalent circuit of MWCNT gas sensor was investigated.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
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• pp.304-308
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• 2000

Surface roughness measurement system with capacitance type gap sensor. Tentative result from the calibration measurement showed the potential applicability of the sensor to the processed specimen. In order to test the sensitivity of the measurement system, several parameters including valley depth, width of the specimen have been changed. Effect of the charge area between sensor and specimen surface has been also analyzed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 C
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• pp.1311-1313
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• 1997

We describe the working principle, the design, and the characteristics of two-chip integrated humidity sensor. The sensing element was manufactured using polyimide. The interface circuits were developed based on a charge redistribution between capacitors. The sensor and signal conditioning chips were packaged together in the same package. The sensor showed excellent linearity over a wide range of relative humidity.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집A
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• pp.262-267
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• 2000

This paper describes a weight in motion(WIM) sensor to measure the weight of a vehicle in motion. The main sensing element of the WIM sensor is the PVDF(Polyvinylidene fluoride) film that shows rapid response to an external excitation. Due to the property of rapid response, it is possible to measure the weight of a vehicle in motion with high speed. In the development of the WIM sensor, the dominant target value was the uniformity of the sensor. To increase the uniformity, We employed shrinkable tube made of rubber to enhance the uniformity, and performed the rolling of the brass tube repeatedly. The uniformity of the sensor was examined experimentally. It was comparable to that of a WIM sensor of the MSI which was the benchmark of this development. This paper also describes the mechanical modeling of the sensor and the suitable charge amplifier for the sensor.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.464-467
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• 2007

All image data acquisition systems for example the digital camera and digital camcorder, use the image sensor to convert the image data (light) into electronic data. These image sensors are used in satellite camera for high quality and resolution image data. There are two kinds of image sensors, the one is the CCD (charge coupled device) detector sensor and the other is the CMOS (complementary metal-oxide semiconductor) image sensor. The CCD sensor control system has more complex than the CMOS sensor control system. For the high quality image data on CCD sensor, the precise timing control signal and the several voltage sources are needed in the control system. In this paper, the comparison of the CCD with CMOS sensor, the CCD sensor characteristic, and the control system will be described.

• 센서학회지
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• 제14권4호
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• pp.225-230
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• 2005

This paper describes a novel tip position sensor made of a triangularly shaped piezoelectric PVDF (polyvinylidene fluoride) film for a cantilever beam. Due to the boundary condition of the cantilever beam and the spatial sensitivity function of the sensor, the charge output of the sensor is proportional to the tip position of the beam. Experimental results with the PVDF sensor were compared with those using two commercially available position sensors: an inductive sensor and an accelerometer. The resonance frequencies of the test beam, measured using the PVDF sensor, matched well with those measured with the two commercial sensors and the PVDF sensor also showed good coherence over wide frequency range, whereas the inductive sensor became poor above a certain frequency.

• Composites Research
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• 제13권6호
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• pp.47-54
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• 2000

복합재 구조물의 저속충격탐지 방법 중의 하나는 고분자 압전센서를 이용하는 것이다. 본 논문에서는 저속충격을 받는 복합재 평판에 대한 충격력과 부착된 스트레인 게이지, 고분자 압전센서 신호와의 관계를 유도하였다. 압전센서의 등가회로도를 통해서 고분자 압전센서의 개회로 신호와 폐회로 신호와의 관계를 유도하여 전하증폭기를 사용하지 않은 고분자 압전센서 신호를 이용하여 복합재 평판의 충격력 복원 가능성에 대한 연구로 확장하였다. 진동실험을 통하여 얻은 복합재 평판의 고유진동수와 감쇠비를 이용하여 해석적인 모델을 수정하여 정방향 문제와 역방향 문제에 있어서 오차를 줄일 수 있었다. 복원된 충격력과 해석적인 센서 신호는 실제 저속 충격 실험을 통하여 측정한 충격력, 스트레인 게이지 신호, 그리고 고분자 압전센서 신호와 잘 일치하였다.

• International Journal of Computer Science & Network Security
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• 제24권4호
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• pp.197-205
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• 2024

This paper presents a fully automated stand-alone irrigation system with GSM (Global System for Mobile Communication) module. Solar energy is utilized to power the system and it is aimed to conserve water by reducing water losses. The system is based on a DC water pump that draws energy from solar panels along with automated water flow control using a moisture sensor. It is also fitted with alert and protection system that consists of an ultrasonic sensor and GSM messages sender that transmits signals showing the levels of the water in the reservoir and the battery charge. The control system is designed to stop the water pump from pumping water either when the battery level drops to equal or less than 10% of its full charge, or when the water level becomes less than 10 cm high in the reservoir. The experimental results revealed that the system is appropriate to use in remote areas with water scarcity and away from the national grid.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1896-1898
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• 2001

An offset problem caused by the static parasitic capacitors is analyzed and then some techniques to reduce their effect on the capacitive position sensor are presented. Also new offset compensation technique is proposed that by adjusting the magnitudes of the modulating signals independently, the charge imbalance between electrodes caused by the parasitic capacitors is eliminated without sensor gain variation. Simulation results are given to validate the proposed compensation technique.