| Project/Area Number |
02505001
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
物理計測・光学
|
|---|
| Research Institution | HIROSHIMA UNIVERSITY |
|---|
Principal Investigator |
MASUJIMA Tsutomu Hiroshima University School of Medecine, Professor, 医学部, 教授 (10136054)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
NISHIZAWA Seiji JASCO Co Ltd., Section Director, 第一事業部, 次長
MIYAZAKI Tadashi JASCO Co Ltd., President, 会長
TOYODA Taro The University of Electro-Communications, Professor, 電気通信学部, 教授 (40217576)
AMEMIYA Yoshiyuki National Laboratory for High Energy Physics, Assoc. Professor, 放射光施設, 助教授 (70151131)
ANDO Masami National Laboratory for High Energy Physics, Professor, 放射光施設, 教授 (30013501)
|
|---|
| Project Period (FY) |
1990 – 1992
|
| Keywords | Photoacoustics / X-ray Absorption / Syncrotron Radiation / EXAFS / Imaging Analysis / Non-destructive Evaluation / Photo-Thermal Phenomena / X線-音響効果 |
|---|
| Research Abstract |
Apparatus and methods for X-ray Acoustic Spectroscopy (XAS) which was innovated by our research group were developed using synchrotron radiation X-ray source.
1.Development of Apparatus
An X-ray acoustic (XA) detector (XA cell) using a electret was developed. X-ray chopper, 1st ion chamber, this XA cell and 2nd ion chamber were aligned in sequence on a optical stage. The XA cell was mounted on the X-Z pulse-stage in order to get the 2 dimensional scanning of the sample for imaging. The scanning of this stage and data acquisition from a lock-in amplifier and the two pico-ampere meters were regulated by a microcomputer using GP-IB bas line. A total system for XAS which can be operated automatically was finally assembled and established.
A new detector which detects the movement of a vibrating membrane optically, we call "optical microphone" was also developed for more sensitivity. One more new detection method using a photopyroelectric sensor, PVDF polymer film, was successfully developed which is also sensitive and can be used under vacuum.
2.Development of Methodology
This method is unique in the ability of non-destructive sub-surface evaluation of materials. For this purpose, X-ray was modulated in semi-pulse shape and irradiated on to the samples. It was found that the delayed signal components was originated from a sub-surface material. By scanning of X-ray beam, the distribution of materials under the surface was revealed. We call this method as "Semi-Pulse XAS method". XA-EXAFS spectroscopy and XA-imaging using focused X-ray beam were also developed and applied successfully to various model samples to find the potentials for analysis of atomic structure and 3-dimensional non-destructive evaluation of materials.
|
