A laser anemometer reference for AIR data calibration

Mandle, Jacques

doi:10.1109/naecon.1988.195029

Cited by 3 publications

(1 citation statement)

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“…Although several techniques have been developed over the years, the most direct and probably the most accurate way to directly obtain the correction factors is to compare the aircraft air data measurements with optically derived measurements obtained non-intrusively from the free stream region in front of the aircraft. Calibrations of the pitot static system and vanes using a laser anemometer have increased accuracy compared with those obtained with conventional techniques, such as using a towed cone, tower fly-by, or a pacer aircraft [1]. A laser anemometer allows precise and remote measurement of air speed, derived from light scattering, just outside the range of the flow disturbance from the aircraft; it is able to provide the velocity in real time with no in-flight calibration using autonomous on-board equipment and without a priori assumptions of the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

1.5μm lidar anemometer for true air speed, angle of sideslip, and angle of attack measurements on-board Piaggio P180 aircraft

Augère¹,

Besson²,

Fleury³

et al. 2016

Meas. Sci. Technol.

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Lidar (Light detection and ranging) is a well established measurement method for the prediction of atmospheric motions through velocity measurements. Recent advances in 1.5µm Lidars show that the technology is mature, offers great ease of use and is reliable and compact. A 1.5µm airborne Lidar appears to be a good candidate for airborne in-flight measurement systems: it allows to measure remotely, outside aircraft aerodynamic disturbance, an absolute air speed (no need of calibration) with a great precision and in all aircraft flight domain.In the frame work of the EU AIM2 project, Onera task has consisted in the development and testing of a 1.5µm anemometer sensor for in-flight airspeed measurements. Objective of this work is to demonstrate that the 1.5µm Lidar sensor can increase the quality of the data acquisition procedure for the aircraft flight test certification. This paper presents the 1.5µm anemometer sensor dedicated to in-flight airspeed measurements and describes the flight tests performed successfully onboard the Piaggio P180 aircraft. Lidar air data have been graphically compared to the air data provided by the aircraft Flight Test Instrumentation (FTI) in the reference frame of the Iidar sensor head. Very good agreement of True Air Speed (TAS), Angle Of Sideslip (AOS) and Angle Of Attack (AOA) was observed.

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Section: Introductionmentioning

confidence: 99%

1.5μm lidar anemometer for true air speed, angle of sideslip, and angle of attack measurements on-board Piaggio P180 aircraft

Augère¹,

Besson²,

Fleury³

et al. 2016

Meas. Sci. Technol.

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Flight testing of laser-optical techniques for future optical air data sensors

Kliebisch,

Lorbeer,

Mahnke

et al. 2024

CEAS Aeronaut J

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Optical air data sensors, which can serve as alternatives or supplements to traditional air data systems, have been a subject of ongoing research. These remote sensing optical sensors offer the advantage of measuring primary air data parameters in undisturbed airflow. As active sensors, they can self-diagnose, associating each measurement with an uncertainty and accounting for signal loss due to factors such as icing or light blocking, thus avoiding silent false measurements. In this paper, we discuss a recent flight test campaign of optical measurement techniques for potential development into air data sensors for future aircraft. We used laser Doppler anemometry, which relies on aerosol scattering of laser light, to observe the Doppler shift of scattered light from multiple directions. This enables the reconstruction of the full wind vector and the retrieval of true air speed, angle of attack, and angle of sideslip. A second instrument used tunable diode laser absorption spectroscopy, which measures an individual transition of molecular oxygen in the A band, in order to extract the static pressure from the observed collisional broadening. The techniques were implemented as airborne research instruments on the DLR’s Dassault Falcon 20 aircraft and tested in two campaigns in 2022 under different atmospheric conditions and dynamic maneuvers. We present results from these campaigns, focusing on general sensor performance, measurement rates, accuracy, and experimental challenges that need to be addressed for future applications.

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