Performance evaluation for long-range turbulence-detection using ultraviolet lidar

Patrick Feneyrou; Jean-Claude Lehureau; Hervé Barny

doi:10.1364/AO.48.003750

Applied Optics
Vol. 48,
Issue 19,
pp. 3750-3759
(2009)
•https://doi.org/10.1364/AO.48.003750

Performance evaluation for long-range turbulence-detection using ultraviolet lidar

Patrick Feneyrou, Jean-Claude Lehureau, and Hervé Barny

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Patrick Feneyrou, Jean-Claude Lehureau, and Hervé Barny, "Performance evaluation for long-range turbulence-detection using ultraviolet lidar," Appl. Opt. 48, 3750-3759 (2009)

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Related Topics
Table of Contents Category
- Remote Sensing and Sensors
Optics & Photonics Topics
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The topics in this list come from the Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Atmospheric turbulence (010.1330)
- Lidar (010.3640)
- Turbulence (280.7060)

About this Article
History
- Original Manuscript: November 17, 2008
- Revised Manuscript: May 4, 2009
- Manuscript Accepted: June 9, 2009
- Published: June 24, 2009

Abstract

Clear-air turbulence could be detected at long range using a UV lidar. Because the vertical speed cannot be retrieved from Doppler shift analysis at long range, the turbulence detection is based on the measurement of molecular density fluctuation associated with the turbulent wind. After an optimization of the characteristics of the candidate UV lidar, we present an evaluation of the detection range and of the false alarm rate and missed alarm rate depending on the altitude and vertical velocity root mean square. This study shows that 96% of turbulence with vertical velocity leading to dislodging of unsecured objects in the airplane can be detected at $15 km$ using a $2 W$ laser at $355 nm$ with a false alarm rate of 0.18 per flight hour.

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Probability of Excess	Altitude ( $km$ )	RMS Turbulence Intensity ( $m / s$ )
$10^{- 3}$	3	2.9
	6	2.2
	9	1.8
	12	1.4
	15	1.0
$10^{- 4}$	3	4.2
	6	3.2
	9	2.7
	12	2.5
	15	2.5

Turbulence Level	Moderate
Aircraft altitude	$6 km$
RMS turbulence amplitude (TAS)	$2.4 m / s$
Discrete gust dimension	$330 m$
N value for vertical velocity to density fluctuations conversion	$0.02 l / s$
Measurement geometry	1 line of sight (LOS) along aircraft flight path
Sun contribution to photon noise	$0 W$ (sun light is supposed to be filtered such as to have a negligible contribution)
Laser source optical power	$2 W$
Laser source PRF	$0.100 KHz$
Integration distance	From $2 x$ the expected detection distance
Distance resolution	$10 m$
Receiver diameter	$150 mm$
Overall optical efficiency	36.1%
Detection efficiency	40%

Probability of Excess	Altitude ( $km$ )	RMS Turbulence Intensity ( $m / s$ )
$10^{- 3}$	3	2.9
	6	2.2
	9	1.8
	12	1.4
	15	1.0
$10^{- 4}$	3	4.2
	6	3.2
	9	2.7
	12	2.5
	15	2.5

Turbulence Level	Moderate
Aircraft altitude	$6 km$
RMS turbulence amplitude (TAS)	$2.4 m / s$
Discrete gust dimension	$330 m$
N value for vertical velocity to density fluctuations conversion	$0.02 l / s$
Measurement geometry	1 line of sight (LOS) along aircraft flight path
Sun contribution to photon noise	$0 W$ (sun light is supposed to be filtered such as to have a negligible contribution)
Laser source optical power	$2 W$
Laser source PRF	$0.100 KHz$
Integration distance	From $2 x$ the expected detection distance
Distance resolution	$10 m$
Receiver diameter	$150 mm$
Overall optical efficiency	36.1%
Detection efficiency	40%

Abstract

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Equations (17)

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