Welcome to the NEW Infrared Training Forum. To view the old message board, please click here.World Class Infrared Training for Thermography Professionals


Post Reply 
 
Thread Rating:
  • 1 Votes - 1 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Analyzing thermal images of water in motion
02-20-2016, 11:09 AM (This post was last modified: 02-21-2016 04:46 PM by SuneN.)
Post: #1
Analyzing thermal images of water in motion
Hi ITC


I am doing a project with the Danish Enviromental Authority. We are looking for temperature signatures from polluted groundwater, entering the riverbed. The water in the river is 0-1C, and the entering polluted ground water is 8-10C.


We are trying to determine if thermography can be used as a tool to located the sections of the riverbed, where the infiltration is occurring.


We are using a FLIR Tau2 336 sensor, attached to a DJI S1000 for the field work. When gathering data, we fly 3 m/s at different heights, following the current.


My question is this:

Why does the area of the water surface, in the top of the image, appear warmer than the water surface near the bottom of the image? The problem persists when moving along the flow in the stream.

Here is a short video showing the problem when moving along the current:

https://www.dropbox.com/s/ypi1cbu8anmcq8...t.avi?dl=0

(Could not uploade the .avi file)

The second time we flew, we tried hovering above certain locations of the river. It then seems as if the water closest to the center of the image is hotter than the water close to the perimeter of the image.

Here is a video of the hover state:

https://www.dropbox.com/s/nqrhrekwudlrw2...t.avi?dl=0


Any input would be appreciated. If please request all settings that could be relevant for solving the issue.


Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
Analyzing thermal images of water in motion - SuneN - 02-20-2016 11:09 AM

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Pixel values when stiching thermal images SuneN 1 1,795 02-22-2016 11:21 AM
Last Post: Gary Orlove
  Stitching thermal images Maureen Young 1 3,085 07-24-2015 05:26 AM
Last Post: Bobberry
  Thermal images through cages Dominic McCafferty 2 3,774 09-06-2012 06:00 AM
Last Post: Dominic McCafferty

Forum Jump:


User(s) browsing this thread: 1 Guest(s)
Copyright © 1999-2012 FLIR Systems, Inc.