Message Board Thread - "Aerial Thermal Imaging - is this resolution possible?"

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Aerial Thermal Imaging - is this resolution possible? uwmech 5/28/2008
I want to cover a 10m x 10m area on a 320 x 240 pixel JPEG image of agricultural or forest area by mounting a thermal IR camera on a plane. The plane can fly at between 1500m to 3000m (5000 ft to 10 000 ft).

I'm doing a quick calculation here to calculate the IFOV I'll need.

10m / 320 pixels = 0.03125 m/pixel
0.03125 m per pixel / 3000m = 0.00001042 rad or 0.014 mrad.

Is this calculation correct? I've done a bit of research and can't find a camera that could provide that sort of spatial resolution.
 
Re:Aerial Thermal Imaging - is this resolution possible? Raphael ITC Eurasia 5/29/2008
I do not know any system with such specifications.
I suggest your tune your requirements to what the market offers, and find the best compromise.
Regards.
 
Re:Aerial Thermal Imaging - is this resolution possible? shsu 5/31/2008
uwmech wrote:
to cover a 10m x 10m area on a 320 x 240 pixel JPEG image of agricultural or forest area by mounting a thermal IR camera on a plane. The plane can fly at between 1500m to 3000m (5000 ft to 10 000 ft).

I'm doing a quick calculation here to calculate the IFOV I'll need.

10m / 320 pixels = 0.03125 m/pixel
0.03125 m per pixel / 3000m = 0.00001042 rad or 0.014 mrad.

Is this calculation correct? I've done a bit of research and can't find a camera that could provide that sort of spatial resolution.
I have one AGEMA Thermovision 1000 that can provide 800x400 resolution and also comes with two integrated lens. (wide FOV is 12 degree and narrow FOV is 3 degree). I think it should meet your requirement.
 
Re:Aerial Thermal Imaging - is this resolution possible? uwmech 6/1/2008
Where can I find a datasheet on this product?
 
Re:Aerial Thermal Imaging - is this resolution possible? JKEngineer 6/1/2008
Since you are not specifying the GRE (ground resolution element size = pixel size on the target) the size of your array is irrelevant.

What governs is the FOV of the lens and the distances. You have approximated the angles using angle = tangent (angle) which is ok for small angles, as you have here.

The key calculation is the FOV of the lens required. This ranges from:
10m view/1500m distance = 0.0067 radians (x360/2pi = 0.38 degrees
to 0.19 degrees for the 3000m altitude.

I am not aware of lenses with that capability.

However, your real requirements are probably an implied GRE. That means that they will be affected by the choice of camera, as well. For example, if the camera has a 640x480 array, then the GRE will 1/2 the size at the same lens and distance and 10m field. Keeping the GRE constant (that is, assuming that your GRE is the requirement as implied by your specifications) would allow a 20m x 20m area using a 640x480 array. Then the lens requirement goes to 0.76 degrees for the lower altitude. Still not realistic, but this is a way to see what you can do. It adds an addtional degree of design freedom inherent in the array parameters.

HTH
Jack
Jack M. Kleinfeld, P.E.
Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering

Bronx, NY 10463

718-884-6644
866-884-6644 toll free
212-214-0919 fax and voice mail
Skype: JKEngineer

JKEngineer @aol.com
or JKEngineer @KleinfeldTechnical.com
come see what we can do for you: http://www.KleinfeldTechnical.com

 
Re:Aerial Thermal Imaging - is this resolution possible? Thermal Inspection Guy 11/5/2008
uwmech wrote:
to cover a 10m x 10m area on a 320 x 240 pixel JPEG image of agricultural or forest area by mounting a thermal IR camera on a plane. The plane can fly at between 1500m to 3000m (5000 ft to 10 000 ft).

I'm doing a quick calculation here to calculate the IFOV I'll need.

10m / 320 pixels = 0.03125 m/pixel
0.03125 m per pixel / 3000m = 0.00001042 rad or 0.014 mrad.

Is this calculation correct? I've done a bit of research and can't find a camera that could provide that sort of spatial resolution.
Just use a helicopter, see our aerials
www.thermalinspections.net
 


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