Takashi Moriyama

Reduction of the Barrier Height of Silicide/p-Si1-xGex Contact for Application in an Infrared Image Sensor

Silicide/p-Si1-xGex Schottky contacts were studied for using in an infrared (IR) image sensor. Si1-xGex layers were grown on p-type (100) Si substrates by using molecular beam epitaxy (MBE). Schottky barrier heights of PtSi(Ge) or PdSi(Ge)/p-Si1-xGex contacts decreased as the Ge content increased. When the Si1-xGex layer was strained, the barrier height was smaller than when relaxed for the same value of x. These results suggest the possibility of a long wavelength (8–12 µm) IR image sensor using a silicide/p-Si1-xGex Schottky contact for the strained layer monolithically grown on a p-Si CCD substrate.

Mission overview and instrument concept of the Global Imager (GLI)

In 1999, ADEOS-II is planned to launch. This satellite aims to observe the global changes of environment based on the carbon, water and energy cycle. For this purpose, ADEOS-II will carry several mission equipments. One of them is GLI (GLobal Imager). GLI is the imaging radiometer possible to observe various objects, for example, ocean color, sea surface temperature, vegetation index, cloud distribution, ice on the land and sea. To satisfy these abilities various methods will be applied to GLI. Collecting Optics consists of 2 off-axis parabolic mirrors to avoid the obstruction in the field of view. Interference filter are joined each other to set up many filter in the focal plane. Both faces of scan mirror will be used in terms of extending the integration time of detectors. In this report these methods and mission of GLI will be described.

Mission studies of Japanese small satellites

This paper introduces the Hypersat and Mission Demonstration Satellite programs, which are small satellite programs in the National Space Development Agency of Japan (NASDA). The goals of the programs are to establish sophisticated microelectronics and mechanics technology; to achieve low cost, high performance satellite; and to quickly respond to the variety of requests from end users. One author has an idea for a high-resolution optical imager which is small and light enough to be launched on this small satellite. This idea is presented in detail. A wide swath strip mode operation SAR design is also introduced.

Diode-pumped solid state laser for spaceborne water vapor DIAL

For future spaceborne water vapor DIAL systems, we started a laser design study in 1994. New laser materials such as Cr:LiSAF are very attractive, but at present there are no high power diode lasers for direct pumping those materials. Therefore we determined to develop a high power diode-pumped Nd:YLF laser and Ti:sapphire laser for water vapor DIAL. The output energy of Nd:YLF laser is expected to be 550 mJ at 1053 nm and 400 mJ at 527 nm with a maximum repetition rate of 150 Hz. A Ti:sapphire laser will be pumped by the SHG of the Nd:YLF laser. Tuning of the Ti:sapphire laser to a strong absorption line (ON1), a weak absorption line (ON2) of water vapor and an off line (OFF) is made by an injection seeder which consists of two single longitudinal mode laser diode modules. Two on-line laser diodes are locked to water vapor absorption lines using an absorption cell or a photo-acoustic cell. These three laser lines (ON1, OFF and ON2) are transmitted into the atmosphere with a triple pulse technique for measurements of water vapor profiles from the ground up to 10 km. The laser spectral width of the on line is expected to be 0.5 pm with a stability of 0.05 pm. The output energy of each laser line is to be more than 100 mJ. This laser system will be developed within three years, and then incorporated as an airborne water DIAL.

Future earth observation scenario and related actvities in Japan

Satellite long term observation scenario has been studied. Earth observation strategy in NASDA consists of following three objectives. Those are (1) monitoring, modeling and prediction of future earth environment by data assimilation, (2) promote satellite data utilization for earth resource management and sustainable development, (3) natural disaster monitoring, modeling and prediction. Satellite measurement form polar, sun-synchronous orbit should be the first priority because of the whole globe coverage. The ADEOS series planned as the major one starts from ADEOS in 1996, ADEOS-II in 1999, ADEOS III in 2003 and follow on. Diurnal variation measurement is also essential for climate change studies especially precipitation and cloud/radiation forcing. ATMOS series has been studied for these mission requirements. ATMOS series has been studied for these mission requirements. ATMOS will be take an inclined orbit to separate diurnal cycle. Newly developed sensors will use experimental platforms such as SPace Stations, small test satellite and airplanes.

Japan's strategy for earth observation by spaceborne infrared instruments

New type of infrared instruments such as Tunable Etalon Remote Sounder for the Earth (TERSE) and High resolution Limb Infrared Absorption Spectrometer (HLAS) were proposed and studied for the future Japanese earth observation satellite program. This paper describes the results of feasibility study of TERSE and HLAS.

Evaluation of the accuracy of the geometric correction for the three different high resolution sensor data (HRV, TM and MESSR)

Abstract The information on the surface of the earth observed with the sensors mounted on artificial satellites has become to be effectively utilized in many fields. This was begun by LANDSAT, and the satellites like SPOT and MOS-1 have been operated, in this way, the fact that the observed and acquired data have become diverse contributed largely to it. These informations have become usable by the users selecting the required ones, on the other hand, a question that is it proper to utilize respective informations by the same image processing technique arose /1/. This study was to compare and evaluate the characteristics of the geometrical distortion indwelling in the satellite data obtained with three kinds of high resolution sensors, that is, MESSR(MOS-1), TM(LANDSAT) and HRV(SPOT). At the time of the precise geometrical correction processing of satellite data, this becomes a valuable guideline.

Mission study overview of Japanese polar orbiting platform program

The JPOP concept, which is part of International Polar Orbiting Platform program, is reviewed. Particular attention is given to the strategy of the JPOP program, observational requirements, strawman candidate sensors, an earth observing scenario, and JPOP system study.