X線回析法を用いた集合組織材料の応力測定法に関する研究

取得学位：博士(工学)，学位授与番号：博甲第279号，学位授与年月日：平成11年3月25日,学位授与年：199

A new meridian imaging spectrogarph for the auroral spectroscopy

Spectroscopic and monochromatic imaging observations of emissions in the upper atmosphere are mutually complementary. A meridian imaging auroral spectrograph (ASG) that can measure a spectrum in the visible region along a meridian has been developed for research on the auroral physics and the polar upper-atmosphere dynamics. Combination of a fast optical system inherited from a monochromatic all-sky imager, a grism as a dispersive element, and a cooled CCD camera has enabled a wide field-of-view of 180° along a meridian, spectral coverage of 420-730 nm, spectral resolution of 1.5-2.0 nm, and high sensitivity to be obtained. The absolute sensitivity over a full-image field was calibrated using a National Institute of Standards and Technology (NIST) traceable integrating sphere and determined to be 0.06 cts/s/R at a wavelength of 560 nm at the zenith. The ASG was installed at Longyearbyen in March 2000, and routine operation was started in the 2000/2001 winter season. An example of an auroral spectral image is presented in this report to demonstrate the performance of the ASG

Scratch test of TiCN thin films with different preferred orientation

The purpose of this study is to examine the effect of crystallite preferred orientation on the mechanical strength of TiCN thin films in highly compressive residual stress. TiCN thin films were deposited by PVD on JIS-SKH55 (AISI M35) steel. The applied substrate bias voltages were set for -50, -80, -100,-120 and -150V. Subsequently, residual stress and crystalline preferred orientation of these specimens were investigated by X-ray diffraction methodology. The crystalline preferred orientation in thin films was evaluated by the ODF calculated from pole figures. On the other hand, dynamic hardness test (DH) and scratch test were executed to evaluate the mechanical strength of thin films. In our study, it was observed that negative bias voltages had an effect on the preferred orientation. The orientation density at -120 V was the highest of all specimens. In addition, the value of scratch section area at -120V was the largest of all specimens. As a conclusion, the relation between the scratch area and the negative bias voltages corresponded to the relation between the preferred orientation and the bias voltages

MF radar observations of antarctic mesosphere and lower thermosphere

The observations of middle atmosphere have been conducted mainly in mid-latitudes so far, although global scale observations are required for the study of the middle atmosphere. We are planning to construct an MF radar observatory at Syowa Station, Antarctica (69°S, 39°E) in 1999. The MF radar observations of horizontal neutral wind velocity (60-100km) are characterized by its high time-height resolutions of 2min-4km and the continuous operation throughout a day, which enables us to observe various atmospheric phenomena over wide frequency range from gravity waves to planetary waves. Further, we discuss the importance of combined observations with other measurement techniques like Na lidar, FPI, all-sky imager and HF radar, and also international cooperative studies through global atmospheric radar networks

System design and initial results of all sky imager at South Pole

We have developed an all-sky optical imager (ASI) which was installed at the Amundsen-Scott South Pole Station (SP) in the 1996-1997 austral summer season. ASI consists of a highly sensitive (monochromatic and panchromatic) optical lens, CCD camera, and a data-taking workstation. The ASI is equipped with interference filters of N_2^+ 427.8nm, Ol 630.0nm, and OH 730.0nm. The image sensor is a back-illuminated air-cooled CCD camera with 512×512 pixels. The size of each pixel is 24μm×24μm. The workstation (WS) is controlled from NIPR via the internet and stores the image data to a digital linear tape (DLT) drive. Selected image data can be sent to NIPR via the Internet during the observational period. We present the detailed system configuration, the data formats and the initial images taken by the ASI-SP system