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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 30, Iss. 18 — Jun. 20, 1991
  • pp: 2598–2608

Continuous wave laser absorption techniques for gasdynamic measurements in supersonic flows

David F. Davidson, Albert Y. Chang, Michael D. DiRosa, and Ronald K. Hanson  »View Author Affiliations


Applied Optics, Vol. 30, Issue 18, pp. 2598-2608 (1991)
http://dx.doi.org/10.1364/AO.30.002598


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Abstract

Line-of-sight measurements of velocity, temperature, pressure, density, and mass flux were performed in a transient shock tube flow using three laser absorption schemes. All methods employed an intracavity-doubled ring dye laser tuned to an OH transition in the A2+X2Π (0,0) band at 306 nm. In the first scheme, the gas was labeled by 193.3-nm excimer photolysis of H2O, and the passage of the generated OH was detected downstream. In the second method, the laser was tuned at a rate of 3 kHz over the R1(7) and R1(11) line pair, and absorption was simultaneously monitored at 90 and 60° with respect to the flow. Velocity was determined from the Doppler shift of the profiles and the temperature from the intensity ratio of the lines. Pressure was determined from both the magnitude of absorption and the collisional broadening. In the third method, the laser wavelength was fixed at a single frequency, and a continuous measurement of velocity and pressure was obtained using the signals from the two beam paths. All methods gave results which compare favorably to calculated values.

© 1991 Optical Society of America

History
Original Manuscript: July 23, 1990
Published: June 20, 1991

Citation
David F. Davidson, Albert Y. Chang, Michael D. DiRosa, and Ronald K. Hanson, "Continuous wave laser absorption techniques for gasdynamic measurements in supersonic flows," Appl. Opt. 30, 2598-2608 (1991)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-30-18-2598

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