| 摘要 |
Known laser diagnostic detection methods use expensive adjustable laser systems in the UV spectral region. The new device consists of a compact, fixed frequency solid laser (1, 2, 3,4 ) which is adjusted so as to carry out special spectroscopic detection methods, at low cost and with high measuring precision and local resolution. An intracavity etalon (5) reduces the band width, and the laser wavelength is defined by tilting the etalon (5) and detuned in a way that can be reproduced (6). The higher harmonious (7, 8) and Raman shifted frequencies (9) are used to diagnose gas dynamic processes by different detection procedures. With this device, uni- or multidimensional measurements can be carried out of OH-radicals, of temperature fields, of gas compositions, and of NO as a pollutant and as a marking substance in hot and cold environments. A second identical device can be used to determine time-delayed speed fields from molecular distributions.
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