Turbulence Profile Measurement with a Dynamically Ranged Rayleigh Beacon

Zuraski, Steven M.; McCrae, Jack E.; Fiorino, Steven T.

doi:10.1364/pcaop.2021.pm2h.2

Cited by 1 publication

(2 citation statements)

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“…The optical setup and the previous method of analysis has been reported previously. [13][14][15] An image of the beam in operation and optical integration at John Bryan Observatory (JBO) is shown in Fig. 1.…”

Section: Optical Setupmentioning

confidence: 99%

“…By measuring the differential tilt variances on neighboring subapertures on the Shack-Hartmann wavefront sensor from a specific range a Fried Parameter segment can be found for each sensed range in the atmosphere. 11 The method takes advantage of a static period of relatively unchanging turbulence-induced wavefront perturbations by rapidly sensing multiple ranges, so it can provide a profile of turbulence in and above the surface layer. AFIT presented another method of turbulence sensing using a Hartmann Turbulence Sensor (HTS) and two beacons.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new approach to profiling atmospheric turbulence using a dynamically ranged Raleigh beacon system

Wilson,

Bose,

Zuraski

et al. 2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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The Turbulence and Aerosol Research Dynamic Interrogation System (TARDIS) is an optical sensing system that is based on dynamically changing the range between the collecting sensor and Rayleigh beacon during a static period of relatively unchanging turbulence-induced wavefront perturbations. In the past, obtaining measurement-based estimates of the turbulence strength profile from TARDIS was based around collating segmented refractive index structure parameter, Cn2 values traced to specific layers of the atmosphere. These values were developed from Fried parameter segments, which were deduced from differential tilt variance measurements from neighboring subapertures on the Shack-Hartmann wavefront sensor. In this work, we will exploit the crossings between the sensing paths from the different beacon locations (during a static period) to the wavefront sensor subapertures to derive turbulence profiles along the path. The differential tilt variance between a pair of subapertures due to a pair of beacons at two different ranges in a crossed sensing path configuration has a unique turbulence weighting function associated with it which depends on the geometry of the beacons and the subapertures. By using these unique path weighting functions along with the corresponding measured differential tilt variances for all configurations where the sensing paths cross, Cn2 profiles along the path can be constructed. The derivation of the weighting functions will be discussed and derived profiles will be compared to measurements from other profiling instruments such as MZA’s DELTA-Sky and to numerical weather prediction models.

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Section: Optical Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%