• Title, Summary, Keyword: Scanning probes

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Confocal Scanning Microscopy with Multiple Optical Probes for High Speed 3D Measurements and Color Imaging (고속 3차원 측정 및 칼라 이미징을 위한 다중 광탐침 공초점 주사 현미경)

  • Chun, Wan-Hee;Lee, Seung-Woo;Ahn, Jin-Woo;Gweon, Dae-Gab
    • Journal of the Semiconductor & Display Technology
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    • v.7 no.1
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    • pp.11-16
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    • 2008
  • Confocal scanning microscopy is a widely used technique for three dimensional measurements because it is characterized by high resolution, high SNR and depth discrimination. Generally an image is generated by moving one optical probe that satisfies the confocal condition on the specimen. Measurement speed is limited by movement speed of the optical probe; scanning speed. To improve measurement speed we increase the number of optical probes. Specimen region to scan is divided by optical probes. Multi-point information each optical probe points to can be obtained simultaneously. Therefore image acquisition speed is increased in proportion to the number of optical probes. And multiple optical probes from red, green and blue laser sources can be used for color imaging and image quality, i.e., contrast, is improved by adding color information by this way. To conclude, this technique contributes to the improvement of measurement speed and image quality.

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Narrow Resonant Double-Ridged Rectangular Waveguide Probe for Near-Field Scanning Microwave Microscopy

  • Kim, Byung-Mun;Son, Hyeok-Woo;Cho, Young-Ki
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.406-412
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    • 2018
  • In this paper, we propose a narrow resonant waveguide probe that can improve the measurement sensitivity in near-field scanning microwave microscopy. The probe consists of a metal waveguide incorporating the following two sections: a straight section at the tip of the probe whose cross-section is a double-ridged rectangle, and whose height is much smaller than the waveguide width; and a standard waveguide section. The advantage of the narrow waveguide is the same as that of the quarter-wave transformer section i.e., it achieves impedance-matching between the sample under test (SUT) and the standard waveguide. The design procedure used for the probe is presented in detail and the performance of the designed resonant probe is evaluated theoretically by using an equivalent circuit. The calculated results are compared with those obtained using the finite element method (Ansoft HFSS), and consistency between the results is demonstrated. Furthermore, the performance of the fabricated resonant probe is evaluated experimentally. At X-band frequencies, we have measured the one-dimensional scanning reflection coefficient of the SUT using the probe. The sensitivity of the proposed resonant probe is improved by more than two times as compared to a conventional waveguide cavity type probe.

Thermal Design and Batch Fabrication of Full SiO2 SThM Probes for Sensitivity Improvement (주사탐침열현미경의 감도향상을 위한 전체 실리콘 산화막 열전탐침의 열적설계 및 일괄제작)

  • Jaung, Seung-Pil;Kim, Kyeong-Tae;Won, Jong-Bo;Kwon, Oh-Myoung;Park, Seung-Ho;Choi, Young-Ki;Lee, Joon-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.10
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    • pp.800-809
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    • 2008
  • Scanning Thermal Microscope (SThM) is the tool that can map out temperature or the thermal property distribution with the highest spatial resolution. Since the local temperature or the thermal property of samples is measured from the extremely small heat transferred through the nanoscale tip-sample contact, improving the sensitivity of SThM probe has always been the key issue. In this study, we develop a new design and fabrication process of SThM probe to improve the sensitivity. The fabrication process is optimized so that cantilevers and tips are made of thermally grown silicon dioxide, which has the lowest thermal conductivity among the materials used in MEMS. The new design allows much higher tip so that heat transfer through the air gap between the sample-probe is reduced further. The position of a reflector is located as far away as possible to minimize the thermal perturbation due to the laser. These full $SiO_2$ SThM probes have much higher sensitivity than that of previous ones.

Detection of Avian Influenza-DNA Hybridization Using Wavelength-scanning Surface Plasmon Resonance Biosensor

  • Kim, Shin-Ae;Kim, Sung-June;Lee, Sang-Hun;Park, Tai-Hyun;Byun, Kyung-Min;Kim, Sung-Guk;Shuler, Michael L.
    • Journal of the Optical Society of Korea
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    • v.13 no.3
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    • pp.392-397
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    • 2009
  • We designed a wavelength interrogation-based surface plasmon resonance (SPR) biosensor to detect avian influenza DNA (AI-DNA). Hybridization reactions between target AI-DNA probes and capture probes immobilized on a gold surface were monitored quantitatively by measuring the resonance wavelength in the visible waveband. The experimental results were consistent with numerical calculations. Although the SPR detection technique does not require the DNA to be labeled, we also evaluated fluorescently-labeled targets to verify the hybridization behavior of the AI-DNA. Changes in resonance were found to be linearly proportional to the amount of bound analyte. A wavelength interrogation-type SPR biosensor can be used for rapid measurement and high-throughput detection of highly pathogenic AI viruses.

Fabrication of Microcantilever Ultrasound Sensor and Its Application to the Scanning Laser Source Technique

  • Sohn, Young-Hoon;Krishnaswamy, Sridhar
    • Journal of the Korean Society for Nondestructive Testing
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    • v.25 no.6
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    • pp.459-466
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    • 2005
  • The scanning laser source (SLS) technique has been proposed recently as an effective way to investigate small surface-breaking defects, By monitoring the amplitude and frequency changes of the ultrasound generated as the SLS scans over a defect, the SLS technique has provided enhanced signal-to-noise performance compared to the traditional pitch-catch or pulse-echo ultrasonic methods, An extension of the SLS approach to map defects in microdevices is proposed by bringing both the generator and the receiver to the near-field scattering region of the defects, To facilitate near-field ultrasound measurement, silicon microcantilever probes are fabricated using microfabrication technique and their acoustical characteristics are investigated, Then, both the laser-generated ultrasonic source and the microcantilever probe are used to monitor near-field scattering by a surface-breaking defect.

Measurement Data Comparison of Fast SAR Measurement System by Probe Arrays with Robot Scanning SAR Measurement System

  • Kim, Jun Hee;Gimm, Yoon-Myoung
    • Journal of electromagnetic engineering and science
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    • v.14 no.4
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    • pp.336-341
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    • 2014
  • Dosimetry of radiating electromagnetic wave from mobile devices to human body has been evaluated by measuring Specific Absorption Rate (SAR). Usual SAR measurement system scans the volume by robot arm to evaluate RF power absorption to human body from wireless devices. It is possible to fast estimate the volume SAR by software deleting robot moving time with the 2D surface SAR data acquired by arrayed probes. This paper shows the principle of fast SAR measurement and the measured data comparison between the fast SAR system and the robot scanning system. Data of the fast SAR is well corresponding with data of robot scanning SAR within ${\pm}3$ dB, and its dynamic range covers from 10 mW/kg to 30 W/kg with 4.8 mm probe diameter.

System Design of an Electronic Watering Device (전자급수기에 관한 연구)

  • 박규태
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.10 no.5
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    • pp.1-6
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    • 1973
  • The paper deals with a study on an electronic watering device. The system is designed to scan 10 probes so that they detect moisture of soil. Input potentials are compared with reference level before the system is watering. rt provides a main clock oscillator and a control oscillator for the system control, and a programmable unijunction transistor is used for the control circuit. The reference levels are adjustable so as to water various soils. The device is tested for two different sails of moisture content ranging from 6 to 51%. It works at any input level higher than 0.6 V compared to the reference level.

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Design and manufacture of atomatic microwave leakage inspection system (전자 오븐의 누설 고주파 자동 검사 시스템 설계와 제작)

  • 이만형;송지복;이석희;정영철;안희태
    • 제어로봇시스템학회:학술대회논문집
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    • pp.492-496
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    • 1987
  • The testing philosophy and control schemes are investigated and applied to construct the Automatic Microwave Leakage Inspection System (AMLIS) . AMLIS is consists of three major parts such as Material Handling Mechanism, Fine Positioning Mechanism and Scanning Mechanism. The material Handling unit is designed to perform loading and unloading microwave oven onto the testing point by pneumatic cylinder and vacuum pump. The Fine positioning part includes X-Y-.THETA. table and distance sensing equipment. The scanning part is composed of five SCARA robots, which traverse X-Y-Z catesian coordinates respectively. The leakage testing probes are placed at the end of this each robot then the path and speed are both controlled via microprocessors. A performance test of this system combined with electric parts and software is done and the basic major function of system are accomplished.

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Multi-Functional Probe Recording: Field-Induced Recording and Near-Field Optical Readout

  • Park, Kang-Ho;Kim, Jeong-Yong;Song, Ki-Bong;Lee, Sung-Q;Kim, Jun-Ho;Kim, Eun-Kyoung
    • ETRI Journal
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    • v.26 no.3
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    • pp.189-194
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    • 2004
  • We demonstrate a high-speed recording based on field-induced manipulation in combination with an optical reading of recorded bits on Au cluster films using the atomic force microscope (AFM) and the near-field scanning optical microscope (NSOM). We reproduced 50 nm-sized mounds by applying short electrical pulses to conducting tips in a non-contact mode as a writing process. The recorded marks were then optically read using bent fiber probes in a transmission mode. A strong enhancement of light transmission is attributed to the local surface plasmon excitation on the protruded dots.

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Development of a Ultrasound Probe for 3-D Ultrasonic Imaging (3차원 의료기기용 초음파진단기 프로브 개발)

  • Park, Jong-Soo;Kim, Seong-Rae;Nam, Yoon-Su
    • Journal of Industrial Technology
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    • v.25 no.A
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    • pp.87-93
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    • 2005
  • Three-dimensional ultrasonic probes being applied to the medical imaging can be grouped into three depending on the scanning methods, which are a mechanical type system, a free-hand system, and 2D phased arrays system. A mechanical type scanner uses a mechanically driven transducer to acquire series of 2D plane images. By integrating these images, a 3-D medical image can be constructed. A motor driving mechanism is a conventional choice for mechanically driving a transducer assembly which picks the raw ultrasonic images up. In this paper we attempt to design a 3D ultrasonic probe which has a operating mechanism of s tilting 3-D scanning. The motion of a transducer assembly of the ultrasonic probe is analytically modelled. We propose a selection procedure for the diameter of a wire rope driving the transducer assembly and the size of torsional spring which gives an initial tension to wire ropes.

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