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20 results on '"Sudou, Takayuki"'

2. Fundamental Research on Controling simultaneously Birefringence and Profile of Plastic Lens

Author

Sudou, Takayuki and NAKAMURA, HARUO

Subjects
Inverse Problem, Birefringence, Plastic lens, Deformation, Aberration, 逆問題，複屈折，プラスチックレンズ，変形，収差
Abstract

プラスチックの球面レンズを研究対象として，逆解析を用いた複屈折の低減と目標形状への変形とを同時に考慮した，レンズの焦点精度向上のための手法を提案し，その有効性を評価した．

Published
2016

6. Performances of THz cameras with enhanced sensitivity in sub-terahertz region

Author

Oda, Naoki, additional, Ishi, Tsutomu, additional, Kurashina, Seiji, additional, Sudou, Takayuki, additional, Morimoto, Takao, additional, Miyoshi, Masaru, additional, Doi, Kohei, additional, Goto, Hideki, additional, Sasaki, Tokuhito, additional, Isoyama, Goro, additional, Kato, Ryukou, additional, Irizawa, Akinori, additional, and Kawase, Keigo, additional

Published
2015
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7. Real-time transmission-type terahertz microscope with palm size terahertz camera and compact quantum cascade laser

Author

Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Hu, Qing, Lee, Alan, Oda, Naoki, Ishi, Tsutomu, Morimoto, Takao, Sudou, Takayuki, Tabata, Hitoshi, Kawabe, Shunsuke, Fukuda, Kyohei, Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Hu, Qing, Lee, Alan, Oda, Naoki, Ishi, Tsutomu, Morimoto, Takao, Sudou, Takayuki, Tabata, Hitoshi, Kawabe, Shunsuke, and Fukuda, Kyohei

Abstract

This paper describes a real-time transmission-type Terahertz (THz) microscope, with palm-size THz camera and compact quantum cascade laser (QCL). The THz camera contains 320x240 microbolometer focal plane array which operates at 30 Hz frame rate and has lock-in imaging function as well as integration functions such as frame integration and spatial filter. These functions are found very powerful in improving signal-to-noise ratio. QCL is installed in compact Stirling cycle cooler. A variety of QCLs covers frequency range from 1.5 to 5 THz and provides time-average power of 0.5~2 mW. The illumination area for sample is changed by adjusting one lens in the illumination optics. Performances of the THz microscope, such as signal-to-noise ratio and so on, were measured and are found consistent with the calculations. THz images taken with the THz microscope are finally presented., National Institute of Information and Communications Technology (Japan)

Published
2014

14. Development of Terahertz focal plane arrays and handy camera

Author

Oda, Naoki, primary, Sano, Masahiko, additional, Sonoda, Ken'ichi, additional, Yoneyama, Hajime, additional, Kurashina, Seiji, additional, Miyoshi, Masaru, additional, Sasaki, Tokuhito, additional, Hosako, Iwao, additional, Sekine, Norihiko, additional, Sudou, Takayuki, additional, and Ohkubo, Shuichi, additional

Published
2011
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18. Development of Terahertz focal plane arrays and handy camera

Author

Oda, Naoki, Sano, Masahiko, Sonoda, Ken'ichi, Yoneyama, Hajime, Kurashina, Seiji, Miyoshi, Masaru, Sasaki, Tokuhito, Hosako, Iwao, Sekine, Norihiko, Sudou, Takayuki, and Ohkubo, Shuichi

Abstract

Uncooled Terahertz (THz) focal plane array (FPA), 320x240 format-23.5 m pitch, and THz imager were developed. There are two types of THz-FPAs, i.e., broad-band type and narrow-band type. Since broad-band type THz-FPA was developed, a couple of modifications have been made to improve Noise Equivalent Power. The narrow-band type THz-FPA has such a new structure that Si cover is put above thermal isolation structure of broad-band type THz-FPA at a distance of half of wavelength of interest. Measurements on responsivities of narrow-band type FPAs show enhancement by a factor of ca. 3. Lock-in imaging technique has been developed, which increases signal-to-noise ratio as a function of square root of the number of frames of integration. Both passive and active THz imaging experiments were finally described.

Published
2011
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