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Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler
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Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Dec 22, 2015

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Page 1: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Code 912, Principle Investigator:

Mr. Bruce Gentry

NASA Academy Research Associate

Jeremy Dobler

Page 2: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Why Study Winds?

Winds are the most important variable studying dynamics and transport in the atmosphere.

Wind measurements are critical to improvement of numerical weather prediction models.

Global wind measurements are essential to NASA’s Earth Science Enterprise mission.

They can be used to study planetary atmospheric dynamics.

Commercial and military aircraft would benefit from clear air wind shear detection as well.

Page 3: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Doppler Lidar Wind Measurement Concept

Molecular ()

Aerosol ()

Backscattered Spectrum

Frequency

Page 4: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

My Contribution

Page 5: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

355 nm Receiver Setup

Page 6: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Moving From Larger to Smaller Systems.

Page 7: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Miniature Dual-Frequency Lidar Components

Solid Fabry-Perot etalon

• 95% reflectivity @ 860 nm

• 15 mm gap

•Finesse ~ 61 FSR ~ 6.66 GHz

• Semi-Conducting Diode Laser (AlGaAs)

• = 852.2 nm

• Power ~ 150 mW CW

Page 8: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Mini-Lidar Breadboard Setup

Page 9: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Future Work!

Complete software interface to automate the modulation of the laser and lock the signal on the edge of the Fabry-Perot etalon filter.

Integrate breadboard system into a mobile container.

Verify velocity measurements on a hard target in lab

Take actual atmospheric data in the field demonstrating the mini-lidar system.

Page 10: Code 912, Principle Investigator: Mr. Bruce Gentry NASA Academy Research Associate Jeremy Dobler.

Thank You To:

The Wisconsin Space Grant Consortium Goddard Space Flight Center University

Programs and the Director’s Discretionary Fund.

Also to: The Academy Staff and all of the

participants of this program. The Staff and Faculty at UW-L