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QUANTITATIVE ESTIMATION OF VARIABILITY IN THE UNDERWATER RADIANCE DISTRIBUTION (RADCAM)

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QUANTITATIVE ESTIMATION OF VARIABILITY IN THE UNDERWATER RADIANCE DISTRIBUTION (RADCAM). Marlon R. Lewis, Principal Investigator Scott D. McLean, Co-Investigator Ronnie Van Dommelen, Senior Engineer Jianwei Wei, Ph.D. Student Ruby Quan, Master’s Student Brian Bylhouwer, Undergraduate Student

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slide1

QUANTITATIVE ESTIMATION OF VARIABILITY IN THE UNDERWATER RADIANCE DISTRIBUTION (RADCAM)

Marlon R. Lewis, Principal Investigator

Scott D. McLean, Co-Investigator

Ronnie Van Dommelen, Senior Engineer

Jianwei Wei, Ph.D. Student

Ruby Quan, Master’s Student

Brian Bylhouwer, Undergraduate Student

May Hammad, Undergraduate Student

Satlantic, Inc.

&

Dalhousie University

measurement of the radiance distribution
Measurement of the Radiance Distribution
  • For RaDyO we will develop and deploy novel instrumentation for the quantitative and radiometrically calibrated measurement of the time and depth dependent full radiance distribution fields in the upper ocean, which could be routinely deployed by the oceanographic community for subsequent scientific analyses of their sources of variability in a variety of water types.
slide3

Hyperspectral Profiler

“HyperPro”

Downward Irradiance

Sensor

Upward Radiance Sensor

CTD, BB2/F, CDOM

current status
Current Status
  • Preliminary data processed
  • Post-calibration complete (looks good).
  • Issue with upward irradiance sensor on surface float (shading?). Testing w/sensor on nose
  • Will reprocess with consistent tare and to evaluate new multi-cast approach to radiometric quantities & AOP estimation in upper ocean (see Zaneveld et al. 2001).
  • Completion estimated by 30 April, 2009 and data submitted to WOODS (and available to any/all).
highly calibrated optics
Highly-Calibrated Optics

Thanks to Ellie Speicher!

radiance cameras
Radiance Cameras
  • Profiling Upwelling and Downwelling Radiance Distribution Camera (RADCAM)
    • High scene-dynamic range (about 6 orders)
    • 550nm center wavelength, 20nm bandpass
    • Nominally 1 degree resolution at nadir
  • RADCAM on MASCOT
  • RADCAM on Bluefin
  • REFERENCE (Sky Radiance Distribution)
slide12

Reference Camera (SkyCam)

Unfortunately, this camera failed during Santa Barbara experiment

slide13

ROV-RadCam Used as a Backup Reference Camera

  • Wet towel to keep ROV-Cam cool.
slide18

RadCam-Pro (Profiling or Tethered)

  • Profiling RadCam with OCR504IR, CTD, and SeaRover.
  • View of SeaRover and upwelling camera.
slide19

Downwelling and Upwelling Images from Profiling-RadCam

  • Downwelling - overcast
  • Float (upper left of Snell)
  • Upwelling
  • School of fish affecting data
  • Downwelling - clear
  • KM (faint, top of Snell)
snell cone fluctuations
Snell Cone Fluctuations

Depth = 1 m

Figure 4: Simple representation of the light field variation across the Snell cone, showing fluctuations near the boundary due to waves and their evolution over time.

slide22

Downwelling Irradiance Validation with OCR504 and Radiance Distribution

20

10m

10

1

20m

Radiance Scale uW/cm2/nm/sr

0.1

Kink in RadCam curve

30m

0.01

40m

<0.001

50m

slide23

Downwelling Average Cosine and Diffuse Attenuation Coefficient Calculated from RadCam Images

Due to kink in RadCam Ed curve

slide24

Upwelling Radiance Validation with OCR504 and Radiance Distribution

20

10

Problems

2m

1

Radiance Scale uW/cm2/nm/sr

0.1

6m

0.01

12m

<0.001

slide26

Upwelling Average Cosine and Diffuse Attenuation Coefficient Calculated from RadCam Images

KLUcalculated from Hyperpro was about 0.14 for first 10m.

slide27

Status

  • Determine immersion coefficients for the cameras.
  • Do multiple system-calibrations for each exposure to better constrain cal data.
  • Find point spread-function for each camera.
  • Solve problems with the mid-radiance exposure data (such as that presented here).
  • Begin processing data captured with high-radiance exposure.
  • ….lots of work to do….good job Jianwei successfully defended his Ph.D. Qualifying Exam (November, 2009)!
slide28

Ready, Aye, Ready…for Hawaii!

But…issue with unperturbed radiance field.

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