Design and Implementation of a LIDAR Imaging System

1
Design and Implementation of a LIDAR Imaging
System

• Senior Project Overview
• Rob Light
• Cindy Scigaj

2
Our Hypothesis

• Rob A temporal lidar system can be developed
  with the Hamamatsu (R5900U-01-L16)
  photomultiplier tube.
• Cindy A Lidar/passive imaging system can be
  devised to be incorporated into the MISI focal
  plain.
• 3 credits each

3
What is Lidar?

• Light Detection and Ranging
• Various Remote Sensing Applications

http//wwwghcc.msfc.nasa.gov/sparcle/what2_sparcle
.html
4
A Planned Use of The Lidar System

• Water Quality Studies
• Excitation Laser
• Molecular Absorption
• Spectral Fluorescence

5
MISI Background

• Designed and built by X. Feng (Ph.D.. thesis
  1996)
• Addition of blackbody radiators to calibrate in
  thermal by E. Ientilucci (senior thesis 1997)
• Thermal Calibration of MISI by J.Schubbuck
  (senior thesis 2000)

6
What is MISI?
Optical fibers to spectrometers
Pyramid mirror
Cassegrain Telescope (focal length 0.5 m)
Fold Mirror
Scan Mirror

• Airborne Modular Imaging Spectrometer Instrument
• Collects data in many spectral bands at high
  resolution

7
More of MISI
VCAL
Calibration targets
BB1
BB2
Mirror
IMG
Diagram of scan mirror
8
MISI in Action

• Modular Imaging Spectrometer Instrument
• Used for thermal calibration of Landsat 7 (in
  cooperation with ground team)

9
Sample MISI Image
Image of Ontario Beach Park
10
Experimental Approach

• Use OSLO optical analysis package to determine
  MISIs optical path for
• long wave detector focal plain
• detector located on opposite part of pyramid
• Determine location on system for a pulse laser

11
Experimental Approach

• Currently there are some issues with the order
  and position of data for LWIR
• OSLO can be used to check how system affects the
  position (even at each surface)

12
16 Channel Photomultiplier Tube

• High Sensitivity
• Fast Response
• Spectral Light Detection

13
Temporal Signal Detection

• Sample Return Signal
• Low Intensity Signal
• Need High Sensitivity Detection

14
Performance Characterization

• Minimum Illumination Threshold
• Spatial Sensitivity

15
Spot Illumination

• Channel Response
• Illumination Testing

16
Electronic Specifications