Experimental validation of the differential image motion lidar concept

Belen'kii, Mikhail S.; Roberts, David W.; Stewart, John; Gimmestad, Gary G.; Dagle, W. R.

doi:10.1364/ol.25.000518

Cited by 22 publications

(15 citation statements)

References 7 publications

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“…These systems are completely passive, using telescopes and starlight to measure the turbulence levels during astronomical observation [4,5]. DIMM techniques also can be employed for the characterization of turbulence horizontally through the atmosphere, assuming a stable remote source at range can be established [6]. For the JHU/APL DIMM system, this source is the optical communication beam as in the recent DARPA free-space optical experimental network experiment (FOENEX) program [2].…”

Section: Introductionmentioning

confidence: 99%

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Laser differential image-motion monitor for characterization of turbulence during free-space optical communication tests

2013

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A laser differential image-motion monitor (DIMM) system was designed and constructed as part of a turbulence characterization suite during the DARPA free-space optical experimental network experiment (FOENEX) program. The developed link measurement system measures the atmospheric coherence length (r0), atmospheric scintillation, and power in the bucket for the 1550 nm band. DIMM measurements are made with two separate apertures coupled to a single InGaAs camera. The angle of arrival (AoA) for the wavefront at each aperture can be calculated based on focal spot movements imaged by the camera. By utilizing a single camera for the simultaneous measurement of the focal spots, the correlation of the variance in the AoA allows a straightforward computation of r0 as in traditional DIMM systems. Standard measurements of scintillation and power in the bucket are made with the same apertures by redirecting a percentage of the incoming signals to InGaAs detectors integrated with logarithmic amplifiers for high sensitivity and high dynamic range. By leveraging two, small apertures, the instrument forms a small size and weight configuration for mounting to actively tracking laser communication terminals for characterizing link performance.

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Section: Introductionmentioning

confidence: 99%

“…DIMM instruments are typically realized by implementing a sub-aperture mask in the pupil plane of large astronomical telescopes [4,6]. This mask, when combined with shallow angle wedges in the optical path, can separate the light into two focal points [4].…”

Section: Introductionmentioning

confidence: 99%

Laser differential image-motion monitor for characterization of turbulence during free-space optical communication tests

2013

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“…Several approaches have been proposed to measure the C 2 n profile. The commonly used methods are the radiosonde balloon method [7] , SCIDAR (scintillation detection and ranging) [8] , SLODAR (slope detection and ranging) [9] , MASS (multiple aperture scintillation sensor) [10] , and lidar methods including differential image motion (DIM) [11] and differential column image motion (DCIM) [12,13] . Compared with other methods, lidar can measure the turbulence profile in different paths (i.e., horizontal path and slant path) based on active light detection, which makes it enjoy better application prospects.…”

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confidence: 99%

Retrieval of Cn2 profile from differential column image motion lidar using the regularization method

Zhi¹,

Tan²,

Xu³

et al. 2017

中国光学快报

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We develop a regularization-based algorithm for reconstructing the C 2 n profile using the profile of Fried's transverse coherent length (r 0 ) of differential column image motion (DCIM) lidar. This algorithm consists of fitting the set of measured data to a spline function and a two-stage inversion method based on regularized least squares QR-factorization (LSQR) in combination with an adaptive selection method. The performance of this algorithm is analyzed by a simulated profile generated from the HV 5∕7 model and experimental DCIM lidar data. Both the simulation and experiment support the presented approach. It is shown that the algorithm can be applied to estimate a reliable C 2 n profile from DCIM lidar.

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“…A number of lidar techniques for measuring turbulence profiles, such as cross-path lidar and differential image motion (DIM) lidar, have been proposed [1][2][3][4][5][6]. Cross-path lidar needs two beacons and a Hartmann wavefront sensor; the spatial resolution is determined by the number of subapertures of the Hartmann.…”

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confidence: 99%

“…To show that the DCIM lidar technique gives the correct value of r 0 , we tested it against a DIM lidar [4,6,8] and a seeing monitor based on the DIM principle by observing stars [7,9]. Only one transmitted laser focused at nearly 5 km was used as the LGS.…”

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confidence: 99%

Development of a differential column image motion light detection and ranging for measuring turbulence profiles

Hou

et al. 2013

Opt. Lett.

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We have developed a differential column image motion (DCIM) lidar for measuring real-time vertical profiles of Fried's transverse coherence length (r0) and testing it against a differential image motion (DIM) lidar and a DIM monitor by observing stars throughout a range of turbulent conditions. With the DCIM lidar system parameters elaborately designed and the detector installed with an angle corresponding to the receiving telescope axis, the focal position of the laser guide star from a range of altitudes that coincide with the CCD's receiving area, r0 of different altitudes can be obtained simultaneously. The experiment results support the DCIM lidar and confirm that a high temporal and spatial resolution r0 profile can be measured with this method.

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Experimental validation of the differential image motion lidar concept

Cited by 22 publications

References 7 publications

Laser differential image-motion monitor for characterization of turbulence during free-space optical communication tests

Laser differential image-motion monitor for characterization of turbulence during free-space optical communication tests

Retrieval of Cn2 profile from differential column image motion lidar using the regularization method

Development of a differential column image motion light detection and ranging for measuring turbulence profiles

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