| タイトル | Acousto-optic spectrometer for radio astronomy |
| 著者（英） | Florez, J. M.; Chin, G.; Buhl, D. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1980-01-01 |
| 言語 | eng |
| 内容記述 | Recent developments in acousto-optic techniques and in photodetector arrays have made feasible a new type of RF spectrometer, offering the advantages of wide bandwidth, high resolution, large number of channels in compact, lightweight, energy efficient, and relatively low cost systems. Such a system employs an acousto-optic diffraction cell which serves the key role of converting RF signals to ultrasonic traveling-waves modulating the optical index of the cell. The cell is illuminated across its aperture by a monochromatic laser beam. A fraction of the light is diffracted by the acoustic waves. A focusing lens follows the cell and essentially performs a Fourier transform of the RF signal into a far-field intensity pattern. CSIRO in Australia and the Tokyo Astronomical Observatory in Japan have taken the lead in using acousto-optic techniques in astronomical applications. The first practical device was successfully made at CSIRO for obtaining dynamical spectrographs of solar radio emission. |
| NASA分類 | INSTRUMENTATION AND PHOTOGRAPHY |
| レポートNO | 81A37760 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/416338 |
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