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Setsuo Kodato - One of the best experts on this subject based on the ideXlab platform.

  • Single crystal silicon micromachined pulsed Infrared Light source
    Sensors, 1997
    Co-Authors: Hiroyasu Yuasa, Seishiro Ohya, Kenji Akimoto, Shiro Karasawa, Setsuo Kodato, K. Takahashi
    Abstract:

    We have newly developed a single crystal silicon micromachined pulsed Infrared Light source, with a microbridge. The chip size is 2/spl times/1/spl times/0.35 mm/sup 3/. The microbridge size is 365/spl times/85/spl times/1.5 /spl mu/m/sup 3/. We can easily control the temperature of silicon microbridge by pulsed electric signal up to the frequency range of 2 kHz. The modulated temperature is more than 700/spl deg/C at 100 Hz and 100/spl deg/C at 2 kHz. The thermal time constant is 0.4 msec. We measured transient temperature distribution of microbridge. We estimate performance of Infrared Light source from these results.

  • Infrared Light Source Made of Heavily Doped Single Crystal Silicon Microbridge
    Ieej Transactions on Sensors and Micromachines, 1997
    Co-Authors: Hiroyasu Yuasa, Seishiro Ohya, Kenji Akimoto, Shiro Karasawa, Setsuo Kodato
    Abstract:

    We have developed an Infrared Light source made of a heavily doped single crystal silicon microbridge. This microbridge was formed by boron ion implantation and ammonia anisotropic etching. This Infrared Light source comprises a microheater. Accordingly Infrared Light is radiated from the heated microbridge. Because the ion implantation is possible to form a very thin layer of heavily doped single crystal silicon, the microheater has very small heat capacity. The size of the microheater is about 650×200×1.5μm3. It had a peak of radiant intensity at 4μm wavelength. Only 150mW drive power was consumed to raise the temperature of the microheater to 780°C. It had a small thermal time constant less than lmsec, and wide modulated temperature more than 700°C at 100Hz. Therefore, the Infrared Light source can radiate intermittent Infrared Light with direct electrical power drive. There is possibility that handy Infrared sensing systems are realized.

Hiroyasu Yuasa - One of the best experts on this subject based on the ideXlab platform.

  • Single crystal silicon micromachined pulsed Infrared Light source
    Sensors, 1997
    Co-Authors: Hiroyasu Yuasa, Seishiro Ohya, Kenji Akimoto, Shiro Karasawa, Setsuo Kodato, K. Takahashi
    Abstract:

    We have newly developed a single crystal silicon micromachined pulsed Infrared Light source, with a microbridge. The chip size is 2/spl times/1/spl times/0.35 mm/sup 3/. The microbridge size is 365/spl times/85/spl times/1.5 /spl mu/m/sup 3/. We can easily control the temperature of silicon microbridge by pulsed electric signal up to the frequency range of 2 kHz. The modulated temperature is more than 700/spl deg/C at 100 Hz and 100/spl deg/C at 2 kHz. The thermal time constant is 0.4 msec. We measured transient temperature distribution of microbridge. We estimate performance of Infrared Light source from these results.

  • Infrared Light Source Made of Heavily Doped Single Crystal Silicon Microbridge
    Ieej Transactions on Sensors and Micromachines, 1997
    Co-Authors: Hiroyasu Yuasa, Seishiro Ohya, Kenji Akimoto, Shiro Karasawa, Setsuo Kodato
    Abstract:

    We have developed an Infrared Light source made of a heavily doped single crystal silicon microbridge. This microbridge was formed by boron ion implantation and ammonia anisotropic etching. This Infrared Light source comprises a microheater. Accordingly Infrared Light is radiated from the heated microbridge. Because the ion implantation is possible to form a very thin layer of heavily doped single crystal silicon, the microheater has very small heat capacity. The size of the microheater is about 650×200×1.5μm3. It had a peak of radiant intensity at 4μm wavelength. Only 150mW drive power was consumed to raise the temperature of the microheater to 780°C. It had a small thermal time constant less than lmsec, and wide modulated temperature more than 700°C at 100Hz. Therefore, the Infrared Light source can radiate intermittent Infrared Light with direct electrical power drive. There is possibility that handy Infrared sensing systems are realized.

Jae-bok Song - One of the best experts on this subject based on the ideXlab platform.

  • 3D environment perception using stereo Infrared Light sources and a camera
    Journal of Institute of Control Robotics and Systems, 2009
    Co-Authors: Sooyong Lee, Jae-bok Song
    Abstract:

    This paper describes a new sensor system for 3D environment perception using stereo structured Infrared Light sources and a camera. Environment and obstacle sensing is the key issue for mobile robot localization and navigation. Laser scanners and Infrared scanners cover and are accurate but too expensive. Those sensors use rotating Light beams so that the range measurements are constrained on a plane. 3D measurements are much more useful in many ways for obstacle detection, map building and localization. Stereo vision is very common way of getting the depth information of 3D environment. However, it requires that the correspondence should be clearly identified and it also heavily depends on the Light condition of the environment. Instead of using stereo camera, monocular camera and two projected Infrared Light sources are used in order to reduce the effects of the ambient Light while getting 3D depth map. Modeling of the projected Light pattern enabled precise estimation of the range. Two successive captures of the image with left and right Infrared Light projection provide several benefits, which include wider area of depth measurement, higher spatial resolution and the visibility perception.

  • Use of coded Infrared Light for mobile robot localization
    Journal of Mechanical Science and Technology, 2008
    Co-Authors: Jungyun Bae, Sooyong Lee, Jae-bok Song
    Abstract:

    This paper presents mobile robot localization using coded Infrared Light as artificial landmark. Different from RFID, coded Infrared Light has highly deterministic characteristics. It is implemented with IR LEDs and phototransistors. By putting several IR LEDs on the ceiling, the floor is divided into several sectors and each sector is set to have a unique identification. Coded Infrared Light tells which sector the robot is in, but the size of the uncertainty is still too large if the sector size is large, which usually occurs. Dead-reckoning provides the estimated robot configuration, but the error becomes accumulated as the robot travels. This paper presents an algorithm that combines both the encoder and the coded Infrared Light information so that the size of the uncertainty becomes smaller. It also introduces a framework that can be used with other types of artificial landmarks. The characteristics of the developed coded Infrared Light and the proposed algorithm are verified from experiments.

  • Mobile robot localization using Infrared Light reflecting landmarks
    2007 International Conference on Control Automation and Systems, 2007
    Co-Authors: Sooyong Lee, Jae-bok Song
    Abstract:

    To achieve autonomous mobile robot navigation, accurate localization technique is the fundamental issue that should be addressed. This paper presents mobile robot localization using Infrared reflective artificial landmarks. In order to minimize the disturbance to the user and to provide the ease of installation, the passive landmarks are used. The landmarks are made of coated film which reflects the Infrared Light efficiently. Infrared Light is not visible, but the camera can capture the reflected Infrared Light. Once the artificial landmark is identified, the robot's relative position/orientation is estimated with respect to the landmark. In order to reduce the number of the required artificial landmarks for a given environment, the pan-tilt mechanism is developed together with the distortion correction algorithm.

  • IROS - Use of coded Infrared Light as artificial landmarks for mobile robot localization
    2007 IEEE RSJ International Conference on Intelligent Robots and Systems, 2007
    Co-Authors: Sooyong Lee, Jae-bok Song
    Abstract:

    This paper presents mobile robot localization using coded Infrared Light as artificial landmarks. Different from RFID, identification using Infrared Light has highly deterministic characteristics. IRID(Infrared identification) is implemented with IR LEDs and photo transistors. By putting several Infrared LEDs on the ceiling, the floor is divided into several sectors and each sector is set to have a unique identification. The coded Infrared Light tells which sector the robot is in, but the size of the uncertainty is still too large if the sector size is large, which usually occur. Dead-reckoning provides the estimated robot configuration but the error is getting accumulated as the robot travels. This paper presents an algorithm which fuses both the encoder and the IRID information so that the size of the uncertainty becomes smaller. It also introduces a framework which can be used with other types of the artificial landmarks. The characteristics of the developed IRID and the proposed algorithm are verified from the experiments.

Sooyong Lee - One of the best experts on this subject based on the ideXlab platform.

  • 3D environment perception using stereo Infrared Light sources and a camera
    Journal of Institute of Control Robotics and Systems, 2009
    Co-Authors: Sooyong Lee, Jae-bok Song
    Abstract:

    This paper describes a new sensor system for 3D environment perception using stereo structured Infrared Light sources and a camera. Environment and obstacle sensing is the key issue for mobile robot localization and navigation. Laser scanners and Infrared scanners cover and are accurate but too expensive. Those sensors use rotating Light beams so that the range measurements are constrained on a plane. 3D measurements are much more useful in many ways for obstacle detection, map building and localization. Stereo vision is very common way of getting the depth information of 3D environment. However, it requires that the correspondence should be clearly identified and it also heavily depends on the Light condition of the environment. Instead of using stereo camera, monocular camera and two projected Infrared Light sources are used in order to reduce the effects of the ambient Light while getting 3D depth map. Modeling of the projected Light pattern enabled precise estimation of the range. Two successive captures of the image with left and right Infrared Light projection provide several benefits, which include wider area of depth measurement, higher spatial resolution and the visibility perception.

  • Use of Infrared Light reflecting landmarks for localization
    Industrial Robot-an International Journal, 2009
    Co-Authors: Sooyong Lee
    Abstract:

    Purpose – This paper aims to present a novel localization scheme using Infrared Light reflecting artificial landmarks.Design/methodology/approach – By putting the Infrared Light reflecting landmarks on the ceiling, localization is achieved. The landmark is designed for effective recognition and identification. From the difference of two successive images, one with the Infrared Light illumination and the other without, the landmarks are clearly identified.Findings – From the mathematical analysis, a greater of landmarks are required if the robot's tilt angles are not known. With the camera's pan/tilt angles information, the distortion of the image can be corrected and fewer landmarks are required. Movement of the camera while getting two successive images is modeled and is compensated.Originality/value – Thorough analysis of practical issues such as capturing the image from a non‐flat floor, pan/tilt motion of the camera and movement of the camera is presented.

  • Use of coded Infrared Light for mobile robot localization
    Journal of Mechanical Science and Technology, 2008
    Co-Authors: Jungyun Bae, Sooyong Lee, Jae-bok Song
    Abstract:

    This paper presents mobile robot localization using coded Infrared Light as artificial landmark. Different from RFID, coded Infrared Light has highly deterministic characteristics. It is implemented with IR LEDs and phototransistors. By putting several IR LEDs on the ceiling, the floor is divided into several sectors and each sector is set to have a unique identification. Coded Infrared Light tells which sector the robot is in, but the size of the uncertainty is still too large if the sector size is large, which usually occurs. Dead-reckoning provides the estimated robot configuration, but the error becomes accumulated as the robot travels. This paper presents an algorithm that combines both the encoder and the coded Infrared Light information so that the size of the uncertainty becomes smaller. It also introduces a framework that can be used with other types of artificial landmarks. The characteristics of the developed coded Infrared Light and the proposed algorithm are verified from experiments.

  • Mobile robot localization using Infrared Light reflecting landmarks
    2007 International Conference on Control Automation and Systems, 2007
    Co-Authors: Sooyong Lee, Jae-bok Song
    Abstract:

    To achieve autonomous mobile robot navigation, accurate localization technique is the fundamental issue that should be addressed. This paper presents mobile robot localization using Infrared reflective artificial landmarks. In order to minimize the disturbance to the user and to provide the ease of installation, the passive landmarks are used. The landmarks are made of coated film which reflects the Infrared Light efficiently. Infrared Light is not visible, but the camera can capture the reflected Infrared Light. Once the artificial landmark is identified, the robot's relative position/orientation is estimated with respect to the landmark. In order to reduce the number of the required artificial landmarks for a given environment, the pan-tilt mechanism is developed together with the distortion correction algorithm.

  • IROS - Use of coded Infrared Light as artificial landmarks for mobile robot localization
    2007 IEEE RSJ International Conference on Intelligent Robots and Systems, 2007
    Co-Authors: Sooyong Lee, Jae-bok Song
    Abstract:

    This paper presents mobile robot localization using coded Infrared Light as artificial landmarks. Different from RFID, identification using Infrared Light has highly deterministic characteristics. IRID(Infrared identification) is implemented with IR LEDs and photo transistors. By putting several Infrared LEDs on the ceiling, the floor is divided into several sectors and each sector is set to have a unique identification. The coded Infrared Light tells which sector the robot is in, but the size of the uncertainty is still too large if the sector size is large, which usually occur. Dead-reckoning provides the estimated robot configuration but the error is getting accumulated as the robot travels. This paper presents an algorithm which fuses both the encoder and the IRID information so that the size of the uncertainty becomes smaller. It also introduces a framework which can be used with other types of the artificial landmarks. The characteristics of the developed IRID and the proposed algorithm are verified from the experiments.

Seishiro Ohya - One of the best experts on this subject based on the ideXlab platform.

  • Single crystal silicon micromachined pulsed Infrared Light source
    Sensors, 1997
    Co-Authors: Hiroyasu Yuasa, Seishiro Ohya, Kenji Akimoto, Shiro Karasawa, Setsuo Kodato, K. Takahashi
    Abstract:

    We have newly developed a single crystal silicon micromachined pulsed Infrared Light source, with a microbridge. The chip size is 2/spl times/1/spl times/0.35 mm/sup 3/. The microbridge size is 365/spl times/85/spl times/1.5 /spl mu/m/sup 3/. We can easily control the temperature of silicon microbridge by pulsed electric signal up to the frequency range of 2 kHz. The modulated temperature is more than 700/spl deg/C at 100 Hz and 100/spl deg/C at 2 kHz. The thermal time constant is 0.4 msec. We measured transient temperature distribution of microbridge. We estimate performance of Infrared Light source from these results.

  • Infrared Light Source Made of Heavily Doped Single Crystal Silicon Microbridge
    Ieej Transactions on Sensors and Micromachines, 1997
    Co-Authors: Hiroyasu Yuasa, Seishiro Ohya, Kenji Akimoto, Shiro Karasawa, Setsuo Kodato
    Abstract:

    We have developed an Infrared Light source made of a heavily doped single crystal silicon microbridge. This microbridge was formed by boron ion implantation and ammonia anisotropic etching. This Infrared Light source comprises a microheater. Accordingly Infrared Light is radiated from the heated microbridge. Because the ion implantation is possible to form a very thin layer of heavily doped single crystal silicon, the microheater has very small heat capacity. The size of the microheater is about 650×200×1.5μm3. It had a peak of radiant intensity at 4μm wavelength. Only 150mW drive power was consumed to raise the temperature of the microheater to 780°C. It had a small thermal time constant less than lmsec, and wide modulated temperature more than 700°C at 100Hz. Therefore, the Infrared Light source can radiate intermittent Infrared Light with direct electrical power drive. There is possibility that handy Infrared sensing systems are realized.