Kps Environment 2 D3 D Wind Profiling


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Fiber Laser for wind profiling and measurement.

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Kps Environment 2 D3 D Wind Profiling

  1. 1. High Power and High PerformanceFiber Lasers and AmplifiersCompact solutions for environmentalsensing and monitoring
  2. 2. Applications:!   Aerosol detection!   2D/3D Wind profiling!   Weather monitoring!   Cloud height measurement!   Pollution monitoring!   Interferometric sensing! Telemetry!   Range finding!   3D scanning!   Obstacle detection!   Airborne mapping
  3. 3. 2D/3D Wind profiling:LIDAR (Light Detection And Ranging)is an optical remote sensing technology that measures properties of backscattered lightto find range or other information of a distant target .To work the Lidar needs some form of backscattering (Rayleigh, Mie, Raman, aerosols etc, ) L idar Concept Beam forming and steering optics L aser control Solid, K eopsys liquid, gas Data processing Pulsed Time-of-flight L aser F requency shift Depolarization Scattered light Detector collection optics Differential abs. Remote M easurements:Remote Measurements: Time-of-F light (T O F) > Distance Time of Flightshift > Velocity= F requency (TOF) Distance Frequncy shift > M acro composition Depolarization = Velocity Depolarization Differential A bsorption > =hemical comp. C Macro composition 6 Differential Absorption = Jean-Marc Delavaux, Feb 23-2010 Chemical component
  4. 4. 2D/3D Wind profiling:LIDAR - Laser Operating ModePulsed LasersMost commonly used for ranging applications ¬ Remote Measurement systems include a lasertransmitter, an optical telescope receiver that amplifies the backscatter, and high sensitivity photo-detector to convert optical energy into electrical impulses.Distance to object is determined by the time taken by the transmitted pulse to the target and back.Time of Flight (TOF) LIDAR !  Non coherent source to avoid optical speckle
  5. 5. 2D/3D Wind profiling:LIDAR - Laser Operating ModeContinous Wave (CW) LasersTransmit a continuous signal, and ranging is carried out by modulating the phase of the laser light.Rely also on the Doppler effect.Travel time is directly proportional to the phase difference between the received and transmittedsinusoidal signal.Coherent LIDAR(Velocity Measurements) !  Laser linewidth < 10 MHz !  Increased signal to noise ratio SNR for ranging by using spectral filtering
  6. 6. 2D/3D Wind profiling:L aser -Requirements for L idarLIDAR Laser Requirements (1) A ttributes Ranging L idar Coherent L idar O perating The must be highly reflective on the target and transparent through the medium Eye safe wavelength >1.4µm, 1.5µm is preferred, but other wavelengths ( i.e. Visible, IR) are chosen to match application requirements O utput power The range of distances is related to power level. The higher the better, provided other attributes of the source are conserved C enter Not necessary but helps SNR at Very important to facilitate A ccuracy & receiver by additional filter. coherent detection, in particular Stability DIAL measurements Coherence Not important, Low Coherent length must be equal L ength coherent prevents speckle. or greater than measurement range L ine-width ( ) Not important, may help Linewidth must be smalller than efficiency & SNR minimum range value 10 Jean-Marc Delavaux, Feb 23-2010
  7. 7. 2D/3D Wind profiling:L aser - Requirements for L idar (2)LIDAR Laser Requirements (2) A ttributes Ranging L idar Coherent L idar Relative intensity Not important, although may Very important ! One of the noise, R I N become important in multiple limiting factor for the system pulse measurement Lidar sensitivity the higher the RIN the less sensitive be the lidar RIN<-140dBc/Hz at fc<10kHz Sensitivity to Not important Very important, can have vibration detrimental effect on stability if system is used in harsh environment O perating Generally important. Very important, can have temperature In particular airborne detrimental effect on stability /spatial, & military if system is used in harsh applications environment Reliability Important Very important Cost Low to moderate High to very high 11 Jean-Marc Delavaux, Feb 23-2010
  8. 8. 2D/3D Wind profiling:LIDAR – Laser System CharacteristicsPulse Energy (E) total energy content of a pulse (typically 100 µJ to several mJ).Pulse Duration (t) is usually defined as the time during which the laser output pulse power remainscontinuously above half its maximum value or peak power (FWHM), (i.e. 1ns to 1µs, typically 10 ns).Pulse Repetition Frequency (PRF or f) (kHz) – number of emitted pulses per second(ranges from 1 to 200 kHz)Beam Divergence (!) is usually defined by the output fiber beam divergence (i.e. M2 or BPP)limited by diffraction, typically 0.3 to 2mrad.Scan Rate –number of times per second a scanning device samples its field of view (25 –1000 Hz)Wind Power Plant Doppler Beam Swinging Profiler (principle) The flow field behind two wind turbines (symbolised by a vertical black lines)
  9. 9. 2D/3D Wind profiling:LLASER versus LIDAR parameters aser versus L idar Parameters L aser L idar Relation Parameter Parameter Pulse Rate (PR F) Range (z) PR F(k H z)<c/2z(m) z=1000m => PR F <150k H z Pulse width ( ) Range Resolution( z) (ns)=6x z(m) Sample depth 10ns =>1.5m at speed of light Beam Divergence ( Trans. Resolution (Sx) Sx= z (mrad) Beam quality: BPP (Spot diameter ) = 1 mrad @ z = 1km. Sx=1m ( mm x mrad) E nergy-per-Pulse (E) SN R E SN R 2 L inewidth ( ) Velocity (V) (MHz)< 2V(m/s) / (um) Coherent only 13
  10. 10. 2D/3D Wind profiling:Laser Operating WavelengthIn theory, any light source can be used to create a LIDAR instrumentTraditionally solid-state Nd:YAG lasers at 1064nm (NIR) & 532nm (green)wavelengths have been used in LIDARSNewer LIDAR designs and applications rely on reliable optical fiber lasertechnology.High performance LIDAR sources are commercially available,from Keopsys, at Visible ( 532nm), Near-Infrared (NIR-1064/1550nm) & Middleinfrared (MIR-2000nm) wavelengths.Fiber lasers are attractive because they offer: !  Combined high collimation and high optical power !  „Eye safe”, compact & low power consumption solutions !  Versatile properties adaptable to specific applications
  11. 11. EOLA! SeriesEye-safe long pulse amplifiersFeatures:!   High energy per pulse up to 100 !J!   Peak power up to 250 W!   Long pulses from 200 to 400 ns!   Repetition frequency from 10 to 20 kHz!   Fourier transformed limited operation!   Polarization Maintaining!   Diffraction limited or M2<1.5 for pulseenergy >15 !J Keopsys can also provide the laser version of this product upon requestIdeal for wind profiling by Doppler heterodyne LiDAR systems
  12. 12. SPIDERLITE MSA! SeriesUltra compact multiple ports high power fiber amplifiersFeatures:!   Multi-ports configurations from 1x30 dBm to 8x20 dBm!   Low noise figure!   Low power consumption!   Low analog signal distorsionIdeal for:!   Sensing!   Highly integrated fiber optic systemsNew! Available in PM
  13. 13. SPARK!frequency fiber laserEye-safe CW single SeriesFeatures:!   Output power up to 2 W!   Operating wavelength from 1545 to 1565 nm!   Narrow linewidth, single frequency!   Ultra low RIN!   Low phase noise!   Random or linear polarization!   Diffraction limited output!   OEM module with RS232Ideal for wind speed measurements from windmill cradle
  14. 14. KULT! Series1 !m ultra compact laser transmitterFeatures:!   Pulse energy up to 10 !J!   Peak power up to 10 kW!   Pulsewidth of 0.1 ns and from 1 to 30 ns!   Repetition frequency from 10 Hz to 1 MHz!   Diffraction limited output!   Can be doubled to 532 nmAll KULT! versions are ideal for:!   Cloud height measurement!   Range finding!   Telemetry!   3D scanning
  15. 15. KULT! SeriesEye safe ultra compact laser transmitter 1.5 !m Features: !   Pulse energy up to 50 !J !   Peak power up to 10 kW !   Pulsewidth from 0.5 to 200 ns !   Repetition frequency from 10 Hz to 1 MHz !   Diffraction limited output 1.5 "m !   PM version available 2 !m Features: !   Pulse energy up to 15 !J !   Peak power up to 1.5 kW !   Pulsewidth from 10 to 40 ns !   Repetition frequency from 5 Hz to 20 kHz !   Diffraction limited output 2 "m
  16. 16. MIRVISION! SeriesEye-safe high power laser transmitterFeatures:!   High pulse energy combined with good beamquality (80 !J and M2<1.5 or >100 !J and M2<3)!   High peak power up to 25 kW!   Pulsewidth from 1 to 10 ns!   Repetition frequency from 20 kHz to 1 MHzIdeal for:!   Range finding!   Obstacle detection!   Airborne applications
  17. 17. LIDAR DEFENCE TELEMETRY INDUSTRY R&D TELECOM T&M MEDICAL FTTxThe ys to Your tical tems Steven D. Wagner Sales & Marketing Manager KEOPSYS SA. 21 rue Louis de Broglie Direct: + 49 89 309 040 271 22300 Lannion, France Tel: +33 2 96 05 08 40 Cell: +49 152 56 77 77 76 Fax: +33 2 96 05 08 01 16.03.11 31