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  2. 久世 宏明

久世 宏明

クゼ ヒロアキ  (Hiroaki Kuze)

基本情報

所属
千葉大学 環境リモートセンシング研究センター (名誉教授)
学位
理学博士(東京大学)
理学修士(東京大学)
J-GLOBAL ID
200901050747556933
researchmap会員ID
1000022849
外部リンク
Hiroaki Kuze finished the graduate school of University of Tokyo in 1982, obtaining the Ph.D degree in physics in the field of quantum electronics. After working as a post-doctoral researcher for the Institute for Physical and Chemical Research (RIKEN), in 1984 he became a research assistant and in 1986 an associate professor in the physics department, faculty of liberal arts, Shizuoka University. During 1987-1988, he stayed at the Institute for Quantum Optics, Max-Planck Institute in West Germany as a visiting scientist. From 1995 to 2004, he worked as associate professor with the Center for Environmental Remote Sensing (CEReS), Chiba University, and in 2004 he became full professor. During 2010-2014 as well as 2018-2020, he served as the director of CEReS. Between 2014 and 2016, he was the president of the Remote Sensing Society of Japan (RSSJ). His major research field is the optical remote sensing of the atmosphere.

研究キーワード

 2

研究分野

 1

経歴

 3

学歴

 2

委員歴

 1

論文

 163
  • Toshihiro Somekawa, Shinri Kurahashi, Shohei Matsuda, Akifumi Yogo, Hiroaki Kuze
    Optics Letters 50(1) 57-57 2024年12月17日  
    We report a hyperspectral Raman imaging lidar system that can remotely detect and identify typical plastic species. The system is based on a frequency-doubled, Q-switched Nd:YAG laser operating at 532 nm and an imaging spectrograph equipped with a gated intensified CCD spectrometer. Stand-off detection of plastics is achieved at 6 m away with a relatively wide field of view of 1 × 150 mm2, thus providing the groundwork for better solutions in monitoring marine plastic pollution.
  • Nofel Lagrosas, Alifu Xiafukaiti, Hiroaki Kuze, Tatsuo Shiina
    Remote Sensing 14(4) 960-960 2022年2月16日  査読有り
  • N. Lagrosas, T. Shiina, H. Kuze
    Journal of Geophysical Research: Atmospheres 126(17) 2021年9月18日  
  • Zixuan Xue, Hiroaki Kuze, Hitoshi Irie
    ATMOSPHERE 12(9) 2021年9月  
    The retrieval of the aerosol optical thickness (AOT) from remotely-sensed data relies on the adopted aerosol model. However, the method of this technique has been rather limited because of the high variability of the surface albedo, in addition to the spatial variability in the aerosol properties over the land surfaces. To overcome unsolved problems, we proposed a method for the visibility-derived AOT estimation from SKYNET-based measurement and daytime satellite images with a custom aerosol model over the Chiba area (35.62 degrees N, 140.10 degrees E), which is located in the greater Tokyo metropolitan area in Japan. Different from conventionally-used aerosol models for the boundary layer, we created a custom aerosol model by using sky-radiometer observation data of aerosol volume size distribution and refractive indices, coupled with spectral response functions (SPFs) of satellite visible bands to alleviate the wide range of path-scattered radiance. We utilized the radiative transfer code 6S to implement the radiative transfer calculation based on the created custom aerosol model. The concurrent data from ground-based measurement are used in the radiative analysis, namely the temporal variation of AOT from SKYNET. The radiative estimation conducted under clear-sky conditions with minimum aerosol loading is used for the determination of the surface albedo, so that the 6S simulation yields a well-defined relation between total radiance and surface albedo. We made look-up tables (LUTs) pixel-by-pixel over the Chiba area for the custom aerosol model to retrieve the satellite AOT distribution based on the surface albedo. Therefore, such a reference of surface albedo generated from clear-sky conditions, in turn, can be employed to retrieve the spatial distribution of AOT on both clear and relatively turbid days. The value for the AOTs retrieved using the custom aerosol model is found to be stable than conventionally-used typical aerosol models, indicating that our method yields substantially better performance.
  • Toshihiro Somekawa, Jun Izawa, Masayuki Fujita, Junji Kawanaka, Hiroaki Kuze
    Applied Optics 60(25) 7772-7774 2021年9月1日  
    We describe a portable Raman lidar system that can remotely detect oil leakages in water. The system has been developed based on a frequency-doubled, Q-switched Nd:YAG laser, operated at 532 nm with a receiver telescope equipped with some filters and photomultipliers. Stand-off detection of oil is achieved in a 6-m-long water tank, which allowed us to considerably increase the survey capability of subsea infrastructures, including both the range observation and target identification.
もっとみる

MISC

 279
  • Wahyu Widada, Hideki Kinjo, Hiroaki Kuze, Nobuo Takeuchi, Makoto Sasaki
    Optical Review 8(5) 382-387 2001年  
    This paper describes the lidar inversion of the tropospheric aerosol extinction profiles under the influence of multiple-scattering effects for various elevation angles of lidar detection. A single-scattering lidar equation is employed to analyze lidar signals with multiple-scattering contributions that are calculated by the Monte Carlo method for given atmospheric conditions. We calculate errors in the optical thickness from the results with and without multiple-scattering effects. It is found that the errors vary in a range of 2-18% according to the optical thickness variation of 0.19-3.8. The dependence of the error on the field-of-view angle of the lidar observation is also discussed.
  • MINOMURA M, KUZE H, TAKEUCHI N
    J. Rem. Sen. Soc. Jpn. 21(3) 260-271 2001年  
    An algorithm is presented for the atmospheric correction of satellite data in the visible and near-infrared spectral region. The algorithm consists of analytic equations which are described only with the radiance components easily obtained with a radiation transfer code such as MODTRAN3. A three-step approach is introduced to precisely evaluate the pixel reflectance. In the first step, the path radiance is removed and in the second and the third steps, the adjacency effect from the neighboring pixels is removed. Using this method, a sensitivity analysis is performed for the NOAA AVHRR channel 1 and channel 2. To obtain a test image, we consider the multiply scattered component and the indirectly ground-reflected component, both of which are dependent on an average reflectance around the target pixel. It is found that a precision of about 1 % (channel 1) and 0.5 % (channel 2) can be obtained with respect to the pixel reflectances if the same atmospheric conditions are applied both to the generation of the test image and to the retrieval of the reflectance image. The method is actually applied to AVHRR images with the optical thickness obtained from ground measurements synchronized with the satellite overpass. The present algorithm is suitable for cases in which the surface reflectance changes on a pixel by pixel basis. Since the algorithm is described with radiance components, its application to any type of satellite sensor is quite straightforward as compared with the conventional lookup table approach.
  • H Kinjo, H Kuze, T Takamura, M Yabuki, N Takeuchi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 40(1) 434-440 2001年1月  
    We propose a method to determine the extinction-to-backscattering ratio (S-1 parameter) in the troposphere from multiwave-length (355, 532, 756, and 1064 nm) lidar data. In our approach, reference profiles are prepared by using the wavelength dependence of the extinction coefficient as derived either from the sun photometer data or fi om the Mie calculation. By comparing these reference profiles with the profiles calculated using the conventional Fernald inversion method, the S-1 parameter is determined for each wavelength. When a reasonable range is covered at 532 nm, this method makes it possible to determine the S-1 parameters for shorter or longer wavelengths for which full range observation cannot be attained, due presumably to small laser power or limited detector efficiency. In addition, information about the vertical uniformity of aerosol properties can he derived from the S-1 dependence of the difference between the reference and retrieved profiles.
  • Weibiao Chen, Hiroaki Kuze, Akihiro Uchiyama, Yoshihide Suzuki, Nobuo Takeuchi
    Atmospheric Environment 35(25) 4273-4280 2001年  
    One-year characteristics of the urban mixed layer is observed by an eye-safe, compact micro pulse lidar (MPL). Retrieval method of the mixed layer height (MLH) and the encroachment model of the mixed layer growing are presented. Two case studies are carried out using summer and late winter data. Comparisons are made between the aerosol optical thickness, the rawinsonde data and the model calculation. The development of the mixed layer exhibits temporal behavior similar to that of the aerosol optical thickness, but with a time difference of about 1-2h. The growth rate of the MLH agrees well with the encroachment model only in the morning, with considerate deviation during the daytime because of the wind effect. One-year growth rate and the maximum MLH are estimated from the MPL measurement between May 1999 and May 2000. The results show that the properties of mixed layer are strongly correlated with the seasonal meteorological conditions. This work also demonstrates that an automated, compact lidar system such as a MPL is quite useful for long-term monitoring of the mixed layer. Copyright © 2001 Elsevier Science Ltd.
  • K. Asakuma, S. Otsutsumi, T. Kubota, M. Yabuki, H. Kuze, N. Takeuchi
    Proceedings of SPIE - The International Society for Optical Engineering 4150 290-298 2001年  査読有り
  • 久世 宏明, 竹内 延夫, 高村 民雄, 薛 雁群, ウィダダ ワヒュウ, 前田 和仁
    千葉大学環境リモートセンシング研究センター年報 5 3-3 2000年10月  
  • 久世 宏明, 竹内 延夫, 美濃村 満生, 金城 秀樹, 佐藤 愛樹
    千葉大学環境リモートセンシング研究センター年報 5 2-2 2000年10月  
  • 竹内 延夫, 久世 宏明, 陳 衛標, 尾松 孝茂, 曽根 明弘, 菅 博文
    千葉大学環境リモートセンシング研究センター年報 5 2-3 2000年10月  
  • 竹内 延夫, 久世 宏明, 汝 剣飛, 美濃村 満生, 朝隈 康司
    千葉大学環境リモートセンシング研究センター年報 5 1-1 2000年10月  
  • 矢吹 正教, 塩原 匡貴, 山内 恭, 平沢 尚彦, 原 圭一郎, 藤谷 雄二, 山形 定, 西田 千春, 柴田 隆, 竹内 延夫, 久世 宏明
    日本気象学会 大会講演予講集 78 385-385 2000年10月  
  • 武田 明知, 矢吹 正教, 大堀 正人, 内藤 季和, 久世 宏明, 竹内 延夫
    日本気象学会 大会講演予講集 78 328-328 2000年10月  
  • 竹内 延夫, 久世 宏明, 矢吹 正教, 武田 明知
    千葉大学環境リモートセンシング研究センター年報 5 2000年10月  
  • SQ Wu, T Kimishima, H Kuze, N Takeuchi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 39(7A) 4034-4040 2000年7月  
    The combination of a diode laser source and a multipass cell is attractive for the detection of trace Eases. The sensitivity achievable with this system, however, is often limited by etalon fringes arising from path length difference among the optical components. In this paper, we describe a sensitive detection method that minimizes the effect of the fringes. In accordance with the expected widths of the 2f (second-harmonic of the modulation frequency) absorption signals of the target molecule, the base length of a multipass cell is chosen so that the free spectral range of the fringes becomes much narrower than the signal widths. Then, the 2f signal is subjected to multistage smoothing to remove the fringe noise by exploiting its periodicity. As a demonstration of this method, trace moisture in nitrogen is detected using a near-infrared, distributed-feedback diode laser and a multipass cell of 20 m absorption length. The detection limit of the system is found to be about 2.3 ppb, two orders of magnitude better than the limit before fringe elimination.
  • WB Chen, H Kuze, N Takeuchi
    OPTICAL REVIEW 7(3) 230-234 2000年5月  
    We propose a high spectral resolution lidar system which is capable of measuring aerosol backscattering and line-of-sight wind velocity in the troposphere. An iodine vapor filter is used to separate the aerosol and Rayleigh scattering components as well as to discriminate the Doppler shift frequency. The performance of the lidar system is estimated with reasonable parameters. The error of horizontal wind velocity below an altitude of 6 km is less than 0.5 m/s, and accuracy of the aerosol backscattering coefficient is better than 40% below 10 km. This system is particularly suitable for the study of aerosol transportation in the troposphere.
  • 竹内 延夫, 久世 宏明, 尾松 孝茂
    千葉大学共同研究推進センター年報 5 197-199 2000年3月31日  
  • 前田 和仁, Widada Wahyu, 岡口 可奈子, 久世 宏明, 竹内 延夫
    千葉大学環境科学研究報告 25 19-23 2000年3月  
  • 佐藤 愛樹, 久世 宏明, 竹内 延夫
    千葉大学環境科学研究報告 25 14-18 2000年3月  
  • 矢吹 正教, 大堤 新吾, 久世 宏明, 竹内 延夫
    千葉大学環境科学研究報告 25 9-13 2000年3月  
  • YQ Xue, JG Niu, WQ Liu, H Kuze, N Takeuchi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 39(2A) 622-627 2000年2月  
    We describe the monitoring of the column density of NO2 using an automated apparatus equipped with a sun-tracker, an optical fiber, and a monochromator with a charge-coupled device array. In order to extract a small absorption from the observed spectra, we introduce a new algorithm in which a spectrum obtained with the same instrument is employed as a reference. This leads to a better elimination of the noise due to large Fraunhofer lines in the solar spectrum in a wavelength range of 430-450 nm. By means of careful spectral matching between the NO2 cross section;nd the optical thickness derived from the observation, a sensitivity for NO2 column density as low as 1 x 10(19) molecules/m(2) is attained.
  • W Widada, H Kuze, YQ Xue, K Maeda, N Takeuchi
    REVIEW OF SCIENTIFIC INSTRUMENTS 71(2) 546-550 2000年2月  
    An automated laser-beam positioning system has been developed and applied to long-path (700 m) monitoring of atmospheric aerosols. The system is based on a piezoelectric-driven mirror mount whose vertical and horizontal positioning is precisely controlled so as to maximize the return beam intensity. By optimizing the direction of the transmitted beam every 5-10 min, the change in aerosol extinction can be measured to an accuracy of better than 2x10(-5) m(-1) without interference from beam displacement due to the temperature change. This positioning method allows one to use relatively small detectors and optical components which are easier to operate and maintain when compared with the previous method for the long-path measurement. (C) 2000 American Institute of Physics. [S0034-6748(00)00402-0].
  • J Niu, H Kuze, N Takeuchi
    ADVANCES IN ATMOSPHERIC SCIENCES 17(3) 363-374 2000年  
    For the measurement of atmospheric NO2 vertical column density (VCD), Kitt Peak Solar Flux Atlas can be substituted as an extraterrestrial solar radiation. Compared with differential analysis method, the Taylor expansion of integrated transfer equation underestimates the VCD. This underestimation is as large as 35% when the amount of NO2 is 1 x 10(17) cm(-2) and observation is conducted with an air mass factor of 10. Even when the VCD is 2 x 10(16) cm(-2) and the air mass factor is 4, the relative error of the retrieved VCD is still no less than 3%. If the observation is restricted under the small air mass factor condition (less than or equal to 4), with Kitt Peak Solar spectrum as an extraterrestrial solar radiation, only an atmospheric layer of 2 km thick from ground can be studied, which will make the absorption too weak to be detected by normal instruments. The VCD in winter Tokyo area was observed and analyzed by differential method, which shows a good precision even when the absorption is as low as 3%. The largest average VCD was about 1.3 x 10(17) cm(-2) and the lowest was about 1.3 x 10(16) cm(-2). The trend of its variation was almost the same as the ground level observation by Saltzman reagent method.
  • M Minomura, JF Ru, H Kuze, N Takeuchi
    REMOTE SENSING AND APPLICATIONS: EARTH, ATMOSPHERE AND OCEANS 25(5) 1033-1036 2000年  
    Standard atmospheric models are employed in radiative transfer codes such as MODTRAN3. The actual atmospheric conditions, especially those due to aerosol particles, change both spatially and temporally. For the atmospheric correction of satellite data it is highly desirable to use the data measured simultaneously with the satellite over flight. Lidars are quite useful to obtain the aerosol information. The Atmospheric Data Correction Lidar, a multi-wavelength lidar system at CEReS, Chiba University, has been applied for that purpose. Lidar signals are collected on June 27, 1997 and December 15, 1997, and analyzed to obtain the aerosol extinction profile. The extinction at 550 nm is interpolated from lidar-derived data and substituted into MODTRAN3 as user-defined 26 layers. To compare this with the result using standard atmospheric model (urban spring/summer and urban fall/winter), the meteorological ground visibility for the latter is adjusted to give the optical thickness the same as the lidar data. The atmospheric correction to NOAA AVHRR data (channel 1 and 2) is performed with two step correction, the first step removing the atmospheric scattering contributions. The second correction, on the other hand, deals with the adjacency effect. This algorithm gives rise to appropriate albedo values in the range of 0.1 to 0.3 for land surfaces and 0.01 to 0.03 for sea surfaces. Although the effect of atmospheric correction is significant, the difference between the results based on lidar data and the standard model is found to be relatively small. (C) 2000 COSPAR. Published by Elsevier Science Ltd.
  • 汝 剣飛, 金田 真一, 美濃村 満生, 久世 宏明, 竹内 延夫
    J. Remote Sensing Soc. Jpn 20(1) 19-31 2000年  
    インドネシア森林火災は,1997年にKalimantanとSumatera島の広い地域で起こり,その年の後半を通じて東南アジアの大気環境および気象条件に大きな影響を及ぼした。火災により様々な化学的物質と粒子が排出され,地域エアロゾルの光学特性が大きく変化した。われわれは,MODISのために開発されたアルゴリズムをNOAAのAVHRRの可視・近赤外チャンネルに応用した。この方法では,6Sを用いて予めルックアップテーブルを計算する。5種類の大粒子モード(Accumulation modes)と6種類の巨大粒子モード(Coarse modes)に基づき,2つの対数正規分布関数から成るエアロゾル粒径分布を構成した。1997年の10月8日―10月9日のNOAA14号のデータを分析した。2つの島の間の海上において,エアロゾルの光学的厚さと,全輝度値に対する大粒子の寄与ηを決定した。この両日間にエアロゾルの性質が激しく変化する様子が明らかになった。日平均の気象データとサンフォトメータのデータを用い結果の検証を行った。また,アマゾンの森林火災のエアロゾルモデルに基づく結果との比較を行った。
  • J Ru, N Takeuchi, T Uezono, S Kaneta, M Minomura, H Kuze, T Takamura, A Higurashi, T Nakajima
    REMOTE SENSING AND APPLICATIONS: EARTH, ATMOSPHERE AND OCEANS 25(5) 1029-1032 2000年  
    Indonesian forest fire took place in wide area of Kalimantan and Sumatera Islands in 1997 and continuously influenced the atmospheric environment and meteorological conditions of South-East Asia nearly throughout the last half of the year. The fire produced various materials including chemical gas and particles, which acted on the optical properties of aerosols in each area. A retrieval algorithm previously developed for MODIS was modified for the NOAA/AVHRR visible and near infrared channels based on the look-up table, which is pre-calculated with 6S code. Local biomass burning aerosol concentrations and contribution factor eta of small radius particles over certain ocean areas between the two islands were derived from two channel data of NOAA/ AVHRR. The results were validated with surface meteorological data, and sun photometer data. (C) 2000 COSPAR. Published by Elsevier Science Ltd.
  • YQ Xue, H Kuze, WB Chen, S Kaneta, T Takamura, N Takeuchi
    OPTICAL REVIEW 7(1) 89-94 2000年1月  
    Ground-based, optical monitoring of the NO2 column density and aerosol optical thickness is described. The instrument consists of a solar radiation spectrometer and a conventional sunphotometer, both mounted on a sun-tracker and operated automatically. From daytime measurements in Chiba during the winter of 1998, variations of NO2 and aerosol are analyzed. Because of the capability of simultaneous, real time measurement, this method is particularly suitable for air pollution studies in city areas.
  • W Widada, N Takeuchi, H Kuze, A Tadaishi, S Shimakura
    OPTICAL REVIEW 7(1) 95-100 2000年1月  
    Lidar return signals are studied for a micro-pulse lidar under sky conditions with multi-layer clouds. From theoretical considerations on the lidar signal-to-noise ratio, it is estimated that the maximum cloud optical thickness detectable is about 3.7. This result reasonably agrees with the actual multi-layer cloud data obtained from observations in Sukhothai, Thailand. Deviations from theoretical prediction, however, are found for a geometrically thin but dense cloud, and for a moderately concentrated but geometrically thick cloud. The effect of multiple scattering is also discussed.
  • Yanqun Xue, Hiroaki Kuze, Weibiao Chen, Shinichi Kaneta, Tamio Takamura, Nobuo Takeuchi
    Optical Review 7(1) 89-94 2000年  
    Ground-based, optical monitoring of the NO2 column density and aerosol optical thickness is described. The instrument consists of a solar radiation spectrometer and a conventional sunphotometer, both mounted on a sun-tracker and operated automatically. From daytime measurements in Chiba during the winter of 1998, variations of NO2 and aerosol are analyzed. Because of the capability of simultaneous, real time measurement, this method is particularly suitable for air pollution studies in city areas.
  • Wahyu Widada, Hiroaki Kuze, Yanqurt Xue, Kazuhito Maeda, Nobuo Takeuchi
    Review of Scientific Instruments 71(2 I) 546-550 2000年  
    An automated laser-beam positioning system has been developed and applied to long-path (700 m) monitoring of atmospheric aerosols. The system is based on a piezoelectric-driven mirror mount whose vertical and horizontal positioning is precisely controlled so as to maximize the return beam intensity. By optimizing the direction of the transmitted beam every 5-10 min, the change in aerosol extinction can be measured to an accuracy of better than 2 × 10-5 m-1 without interference from beam displacement due to the temperature change. This positioning method allows one to use relatively small detectors and optical components which are easier to operate and maintain when compared with the previous method for the long-path measurement. © 2000 American Institute of Physics.
  • Wahyu Widada, Nobuo Takeuchi, Hiroaki Kuze, Akira Tadaishi, Shin Shimakura
    Optical Review 7(1) 95-100 2000年  
    Lidar return signals are studied for a micro-pulse lidar under sky conditions with multi-layer clouds. From theoretical considerations on the lidar signal-to-noise ratio, it is estimated that the maximum cloud optical thickness detectable is about 3.7. This result reasonably agrees with the actual multi-layer cloud data obtained from observations in Sukhothai, Thailand. Deviations from theoretical prediction, however, are found for a geometrically thin but dense cloud, and for a moderately concentrated but geometrically thick cloud. The effect of multiple scattering is also discussed.
  • Yabuki, M, H. Kinjo, H. Kuze, N. Takeuchi
    Lidar Remote Sensing for Industry and Environment Monitoring (Sendai, Japan), 132-142 2000年  
  • 由井 四海, 久世 宏明, 竹内 延夫
    千葉大学環境科学研究報告 26 39-42 2000年  
  • 金城 秀樹, 矢吹 正教, 久世 宏明, 高村 民雄, 竹内 延夫
    光波センシング技術研究会講演論文集 = Proceedings of ... Meeting on Lightwave Sensing Technology 24 101-104 1999年12月15日  
  • R Toriumi, H Tai, H Kuze, N Takeuchi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 38(11) 6372-6378 1999年11月  
    A solid-state differential absorption lidar (DIAL) system was developed for nitric oxide monitoring. The ultraviolet (UV) light was generated through second-harmonic generation, subsequent to the sum-frequency mixing of the pulses from a Ti:sapphire laser, pumped by a frequency-doubled Nd:YAG laser, and from the fundamental of another Nd:YAG laser. The output pulse energy achieved in this way was 4 mJ at 226.8 nm with 2 pm linewidth. This DIAL system made it possible to measure the spatial distribution of nitric oxide emitted from a diesel engine installed at a distance of 130m from the lidar for demonstration of stack plume, with the detection accuracy of 0.065 ppm with a range resolution of 10 m. We also measured the background nitric oxide of the order of 10 ppb in the urban atmosphere.
  • 武田 明知, 矢吹 正教, 内藤 季和, 久世 宏明, 竹内 延夫
    日本気象学会 大会講演予講集 76 276-276 1999年11月  
  • 竹内 延夫, 久世 宏明, 高村 民雄, 劉 文清, 邱 金桓, Wattanachaiyingcharoen Det, Yoon S. C., Alarcon M.
    千葉大学環境リモートセンシング研究センター年報 4 3-3 1999年10月  
  • 久世 宏明, 竹内 延夫, 薛 雁群, ウィダダ ワヒュウ, 前田 和仁
    千葉大学環境リモートセンシング研究センター年報 4 4-4 1999年10月  
  • 竹内 延夫, 久世 宏明, 只石 彰
    千葉大学環境リモートセンシング研究センター年報 4 3-3 1999年10月  
  • 竹内 延夫, 久世 宏明
    千葉大学環境リモートセンシング研究センター年報 4 76-76 1999年10月  
  • 久世 宏明, 竹内 延夫
    千葉大学環境リモートセンシング研究センター年報 4 82-83 1999年10月  
  • 竹内 延夫, 久世 宏明
    千葉大学環境リモートセンシング研究センター年報 4 82-82 1999年10月  
  • 竹内 延夫, 久世 宏明, 上園 哲司, 矢吹 正教
    千葉大学環境リモートセンシング研究センター年報 4 2-2 1999年10月  
  • 金城 秀樹, 久世 弘明, 佐々木 真人
    日本物理学会講演概要集 54(2) 86-86 1999年9月13日  
  • OKAZAWA R, KUZE H, MASUSAKI H, TAKEUCHI N
    Jpn. J. Appl. Phys. 38(8) 4946-4949 1999年8月  
  • SQ Wu, H Masusaki, T Kimishima, H Kuze, N Takeuchi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 38(8) 4788-4793 1999年8月  
    We report on the sensitivity improvement of in the quantitative measurement of trace moisture in ammonia gas. A 1371 nm InGaAsP distributed-feedback diode laser operating at room temperature was used as the fight source. A dual-cell optical configuration was employed in the scheme of tunable diode laser absorption spectrometry. Using signal and reference cells, both 92 cm in length, the interfering effects of absorption lines of the major constituent gas (ammonia) were canceled in a remarkable manner. Other common mode noises including the etalon fringes associated with the wavelength scan were also reduced. The system is capable of detecting trace moisture content of as low as 12 parts per billion. This is an improvement of more than two orders of magnitude compared with the conventional method of single-cell detection.
  • Yabuki M, N. Takeuchi, H. Kuze, W. Chen, S. Naito, S-C. Yoon, J-G. Won, J. Qiu, A. Y.S. Cheng, H. Liu, J. T. Villarin
    Asian Lidar Observation Network Meeting (Home Faculty House, Seoul National University, Seoul, Korea), S3-1 1999年8月  
  • 矢吹 正教, 竹内 延夫, 内藤 季和, 久世 宏明
    エアロゾル科学・技術研究討論会 = Symposium on Aerosol Science & Technology 16 48-49 1999年7月1日  
  • 久世 宏明
    共同利用研究会報告集 5 6-13 1999年6月16日  
  • 薛 雁群, 鈕 建国, 劉 文清, 久世 宏明, 竹内 延夫
    光波センシング技術研究会講演論文集 = Proceedings of ... Meeting on Lightwave Sensing Technology 23 83-89 1999年6月3日  
  • WIDADA Wahyu, 久世 宏明, 竹内 延夫
    学術講演会論文集 = Proceedings of the ... Japanese Conference on Remote Sensing 26 723-724 1999年5月1日  
  • 朝隈 康司, 汝 剣飛, 久世 宏明, 竹内 延夫
    学術講演会論文集 = Proceedings of the ... Japanese Conference on Remote Sensing 26 259-260 1999年5月1日  

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