Download PDF by William Elwood Byerly: An introduction to generalized coordinates in mechanics and

By William Elwood Byerly

ISBN-10: 117152451X

ISBN-13: 9781171524519

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Density measurements can be made directly using Rayleigh scattering from the molecules in the flow. The different scattering cross sections of such gases as freon and air also make Rayleigh scattering useful for observing mixing phenomena (Yip 1986b). Since the detected light is at the incident laser frequency, scattering from particles in the flow can easily obscure the Rayleigh signal. Raman scattering occurs when the scattering process causes the molecular state to change. Due to energy conservation, the scattered light is then at a different frequency than the incident light.

Table I gives the scattering cross sections and vibrational Raman shifts for various molecules of particular interest to gas diagnostics. 2935 . 2531 (e) N2 He Air O2 I-h (vapor) (a) (I» (c) (e) (e) (d) Raman Raman Rayleigh Cross-section Cross-section Shift cm- 1 cm 2 /sr cm 2 /sr Calc. Meal>. (f) Meal>. 083 _ . 43 5f>.! 5:32 JI and O°C, 760 mm a. h. c. d. (Peck 1966) e. (Washburn 1930) (Peck 1983) f. (Shardanand 1977) (Peck 1972) g. (Schrotter 1979) (Old 1981) Rayleigh and Raman Scattering Cross-sections for Common Gases TABLE I 42 light to be at a higher frequency than the incident light (anti-Stokes scattering).

The integral is over the collection angle of the optics. Referring back to Eqs. 2 and 3, we note several important features: l. , the sky is blue); 2. There is an equal amount of scattering in the forward and backward direction; 3. There is significant polarization for 90 scattering. 532 Il (doubled Nd:YAG laser) together with calculated and measured values of the differential Rayleigh scattering cross sections for various molecular gases at STP. Scattering from particles where r > A is usually called Mie scattering.

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An introduction to generalized coordinates in mechanics and physics by William Elwood Byerly

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