Dazzling sensitivity analysis of a microbolometer array on an infrared laser irradiation breadboard

International audienceLaser sources have evolved towards lower cost and higher power, and the risk of imaging system disturbance due to laser dazzling effects can no more be ignored. In this paper we first present an experimental bench which has been developed specifically to perform dazzling experiments on infrared focal plane arrays. With this breadboard, dazzling experiments have been conducted on various types of focal plane arrays. We will focus on results obtained on a standard microbolometer array. The main parameters affecting dazzling phenomena were varied and conclusions on the dazzling phenomena are proposed. Since the major impact of laser pulses on microbolometer focal plane is due to heating, a first and simple phenomenological model of laser dazzling of these uncooled detectors is presented. Moreover thanks to the high level of performance of this breadboard, a new method is described for the direct measurement of the thermal time constant of the microbolometer array

1.5µm Lidar anemometer for True Air Speed, Angle Of Sideslip and Angle Of Attack measurements onboard Piaggio P180 aircraft

International audienceLidar (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. 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

Characterisation of Small-Scale Atmospheric Wind-Field Structures Using Coherent Wind Lidar With Short Pulses

A lidar design has been developed at ONERA that uses short square pulses (75 ns) to have a small spatial resolution (22.5 m) and be able to measure small-scale atmospheric wind-field structures. Results show that the system is able to resolve the small-scale structures of vortices and to measure wind field structures of a turbulent wind field down to ~20 m

Characterisation of Small-Scale Atmospheric Wind-Field Structures Using Coherent Wind Lidar With Short Pulses

A lidar design has been developed at ONERA that uses short square pulses (75 ns) to have a small spatial resolution (22.5 m) and be able to measure small-scale atmospheric wind-field structures. Results show that the system is able to resolve the small-scale structures of vortices and to measure wind field structures of a turbulent wind field down to ~20 m

Camera laser tridimensionnelle 'TILT' pour le guidage de robots autonomes

Communication a : Conference Internationale d'Optique Spatiale ICSO'91, Toulouse (France), 25-27 septembre 1991SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1993 n.136 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Automotive exhaust gas analysis, wind tunnel measurements and atmospheric gas trace monitoring using infrared tuneable diode laser absorption spectroscopy

Communication to : 5th international symposium on gas analysis by tuneable diode lasers, Fribourg (DE), February 25-26, 1998Available from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1998 n.12 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc

Aircraft Wake Vortex Study and Characterization with 1.5 µm Fiber Doppler Lidar

International audienceFor ten years now, Onera has been developing lidar tools for wake vortex detection and studies. Since 2003, new developments based on 1.5 µM fibered laser sources have been achieved in parallel with extensive research work on the laser sources themselves.Three innovative lidars have been developed and are presented in this paper:1) A mini-lidar, based on a CW (continuous-wave) 2 W / 1.5 µM laser source, for aircraft model wake vortex characterization in a catapult facility. A self-triangulation technique allows the vortex core position to be found with 10 cm error, and the circulation error is 10 %.2) A pulsed 1.5 µM lidar, based on a 50 µJ / 15 kHz MOPA (Master Oscillator Power Amplifier) source, for lateral wake vortex monitoring at airports. The range is 400 m, the core position error is about ± 2 m and the circulation error is about 10 %.3) A pulsed 1.5 µM lidar, based on a 120 µJ / 12 kHz MOPA source, for onboard axial wake vortex detection. Ground based lidar tests at Orly airport have demonstrated wake vortex detection up to 1.2 km