Biomedical subjects

Rachel A Johnston

Publications and source records attributed to Rachel A Johnston.

2 recordsLinked to original sources

PubMed2003

Horizontal scintillation detection and ranging Cn2(z) estimation.

The strength of optical turbulence, Cn2(z), 2-3 m above ground level, was measured as a function of distance along a 1.23-km path by the simultaneous capture of the scintillation from two infrared laser sources. The data collected differ in a number of important aspects from the normal vertical scintillation detection and ranging (SCIDAR) data in astronomy. The SCIDAR inversion method for the horizontal path problem is outlined and demonstrated on experimental data collected from three field trials.

Journal Article↗

PubMed2002

Generalized scintillation detection and ranging results obtained by use of a modified inversion technique.

The measurement of the strength of atmospheric optical turbulence by use of a modified generalized SCIDAR (scintillation detection and ranging) inversion technique is outlined and demonstrated. This new method for normalizing and inverting scintillation covariances incorporates the geometry specific to generalized SCIDAR. Examples of profiles from two astronomical observation sites are presented.

Journal Article↗