Accession Number:

ADA056746

Title:

Optical Transmission through the Turbulent Atmosphere

Descriptive Note:

Final scientific rept. 1 Oct 1976-31 Jan 1978

Corporate Author:

CALIFORNIA UNIV IRVINE SCHOOL OF ENGINEERING

Personal Author(s):

• Gamo, Hideya

Report Date:

1978-03-30

Pagination or Media Count:

65.0

Abstract:

A turbulence chamber 0.78 m x 0.23 m x 2.59 m consisting of 10 small electric heaterblowers with 2 mm aluminum wire meshes can generate the nearly homogeneous isotropic turbulence with the region of 0.5 m x 0.05 m x 2 m. The temperature structure constant was obtained from the temperature structure function measurements using a differential microthermocouple system. The refractive index structure constant was calculated from the temperature structure constant at the average temperature 53 C. From the measured power spectrum of temperature fluctuations and the average wind velocity 0.41 msec we determined the inner and outer scales of turbulence l sub 0 5.0 nm and L sub 0 6.5 cm, respectively. The measured temperature structures fluctuations satisfy the 23 and -53 power similarity laws, characteristics of the inertial subrange, respectively.

Descriptors:

• *TURBULENCE
• *LIGHT SCATTERING
• IRRADIATION
• ATMOSPHERIC SCATTERING
• LASER BEAMS
• ISOTROPISM
• REFRACTIVE INDEX
• TEMPERATURE
• POWER SPECTRA

Subject Categories:

• Electricity and Magnetism
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE