Working Group on Space Based Lidar Winds June 28 - 30, 2005 Welches, OR

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SLWG 2005 The Tropospheric Wind Lidar Technology Experiment (TWiLiTE), a NASA IIP Technology Development and Demonstration Project B. Gentry, R. Atlas, G. Schwemmer, M. McGill, M. Hardesty, A. Brewer, T. Wilkerson, J. Marzouk, S. Lindemann Working Group on Space Based Lidar Winds June 28 - 30, 2005 Welches, OR

description

The Tropospheric Wind Lidar Technology Experiment (TWiLiTE), a NASA IIP Technology Development and Demonstration Project B. Gentry, R. Atlas, G. Schwemmer, M. McGill, M. Hardesty, A. Brewer, T. Wilkerson, J. Marzouk, S. Lindemann. - PowerPoint PPT Presentation

Transcript of Working Group on Space Based Lidar Winds June 28 - 30, 2005 Welches, OR

Page 1: Working Group on Space Based Lidar Winds June 28 - 30, 2005 Welches, OR

SLWG 2005

The Tropospheric Wind Lidar Technology Experiment (TWiLiTE), a NASA IIP

Technology Development and Demonstration Project

B. Gentry, R. Atlas, G. Schwemmer, M. McGill, M. Hardesty, A. Brewer, T. Wilkerson, J. Marzouk, S.

Lindemann

Working Group on Space Based Lidar WindsJune 28 - 30, 2005

Welches, OR

Page 2: Working Group on Space Based Lidar Winds June 28 - 30, 2005 Welches, OR

SLWG 2005

• High altitude airborne direct detection scanning Doppler lidar

• Serves as a system level demonstration and as a technology testbed

• Leverages technology investment from multiple SBIRs, ESTO, IPO and internal funding

• Consistent with the roadmap and planning activities for direct detection and ‘hybrid’ Doppler lidar implementations

Page 3: Working Group on Space Based Lidar Winds June 28 - 30, 2005 Welches, OR

SLWG 2005

Approach

Leverages significant technology investments and instrument development heritage

SBIR+ESTO+IPO+IRAD Laser – LiteCycles,

Fibertek Data System – ASRC HOE – Ralcon FP etalon – MAC

Fielded Systems GLOW, CPL, HARLIE

IPO IR&DSBIR

HARLIE

GLOW

CPL

TWiLiTE

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SLWG 2005

Proposed TWiLiTE Measurement Requirements

Parameter Proteus WB57

Velocity accuracy (LOS projected) (m/s) 1.5 1.5

Range of regard km 0-18 0-18

Vertical resolution km 0.25 0.25

Horizontal resolution km 25 25

Groundspeed m/s 100 200

Nadir angle deg 45 45

Scan pattern 16 pt step-stare 8 pt step-stare

Scan cycle time seconds (km)* 192 (19.2 km) 112 (=22.4 km)

Horizontal integration per LOS (seconds)//ground track (km)

10//1 10//2

* Assumes scanner average angular velocity of 12 deg/sec

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SLWG 2005

Entrance TRL Exit TRL

High spectral resolution all solid state laser transmitter

– Well developed diode-pumped Nd:YAG technology for efficient, long-life, space qualified laser

4 5-6

High spectral resolution optical filters – High resolution, high throughput, stable, tunable optical filters for Doppler wind measurement

4 5-6

Efficient 355 nm photon counting molecular Doppler receiver

4 5-6

Novel UV Holographic Optical Element telescopes and scanning optics

3 5-6

TWiLiTE Direct Detection Wind Lidar Key Technologies

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SLWG 2005

Laser (LiteCycles)

• Leverages funding from SBIR + ESTO• 15 W optical power in uv (15 mJ @

1000 pps)• All solid state diode pumped Nd:YAG

laser• Stable, single frequency operation• High conversion efficiency to 3rd

harmonic (355 nm)• Engineered and packaged for aircraft

operation• Heritage: Cloud Physics Lidar

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SLWG 2005

• Leverages funding from SBIR + ESTO• 2.5 W optical power (50 mJ@ 50pps)• All solid state conduction cooled design• Stable, single frequency operation• High conversion efficiency to 3rd

harmonic (355 nm)

• HB Laser on vibration test fixture

– Seeding is stable for 0.5 g bench accelerations at frequencies up to 200 Hz

Amplifers

Seeded Oscillator

Harmonic generators

High Brightness Laser (Fibertek)

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SLWG 2005

HOE Telescope/Scanner

• HARLIE heritage• Utah State University/Space

Dynamics Lab compact folded design

• UV HOE success – >50% efficiency; <200 µrad spot

Recent laboratory measurements (left) verify performance of 40 cm diam., 355 nm HOEs.

The SDL design features a central port for laser transmission and fiber coupled receiver output.

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HOE/Scanner Heritage/Contributors

• $3.5M in NASA Investments since 1990• PHASERS lidar (532 nm) 1994-present• HARLIE airborne lidar (1064 nm) 1998-present – extensive field use• UV HOEs (355 nm) 2000-present• 2 NASA patents, 3 USU patents• Contributors: Thomas Wilkerson (SDL/USU), Richard Rallison (Ralcon), David Guerra (St. Anselm)

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SLWG 2005

Advanced Molecular Doppler Receiver

IRAD receiver summary • Reduce volume of Zephyr Double Edge receiver design by >85%• Increase throughput by 1.8x• Dynamic range of each channel increased by 2 orders of magnitude• Utilizes Michigan Aerospace etalon technology.• Robust mechanical design suitable for airborne or spaceborne applications

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SLWG 2005

SBIR Phase II awarded in Dec 2004

Objectives :

1. Develop lightweight, thermally stable etalon design using SiC

2. Flight qualify the etalon

3. Develop a digital version of the etalon controller

Michigan Aerospace Corporation Advanced Etalon Technology

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SLWG 2005

System Block Diagram

Scanner Ctrl

Laser Power

Timing/Control

Data Acq.

Laser

Com

puter

HOE Scanner/Telescope

Laser Cooling

SIGNAL FIBER

ANALOG/PHOTON COUNTS, SYS DATA

Etalon Control

SYNCAUTOFOV TO COMP

Det. Box Temp

PRESSURE VESSEL

ETALON

Bm Exp

RE

CE

IVE

R T

EM

P C

ON

TR

OL

ETALON SPACING/PARALLELISM

A/D SIGNALFIBERWATERPOWER

AUTO TIP/TILT ADJ

INS/GPS Data

Power Dist/Sw

INS

/GP

S

MOLECULAR DE DOPPLER RECEIVER

PRESSURE VESSEL

PRESSURE VESSEL

PRESSURE VESSEL Window

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SLWG 2005

Design Concept MechanicalDoppler Receiver

Data System+ Flight Electronics

HOE Telescope/ Scanner

Laser

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SLWG 2005

TWiLiTE Schedule• Anticipate September 2005 start• Initial Test Flights in 2008