Remote thermal detection

My money would be on a Particle Image Velocimetry (PIV) based
solution.
Largely because this is technology which is extremely widely used
(every laser mouse does it in hardware).
I've heard about model airplanes using it to stabilize bank angle
(more speed = lower wing).

Roel

On Wednesday, 24 October 2012 08:57:21 UTC+1, Roel Baardman wrote:
My money would be on a Particle Image Velocimetry (PIV) based
solution.

Largely because this is technology which is extremely widely used
(every laser mouse does it in hardware).

Optical mice use integrated circuits like the Agilent ADNS-2620:
http://www.datasheetcatalog.org/data...cyqglz0hcy.pdf

So, unless you can form a 2D image of the particles'
velocity and have the ic process that image, I don't
see how you would do it.

I've heard about model airplanes using it to stabilize bank angle
(more speed = lower wing).

Quite possible. Many years ago I saw one of the
optical mice in the form or a ring on a finger.
With the appropriate focussing distance, the room
itself was used as a mouse pad.

On Wednesday, October 24, 2012 10:50:01 AM UTC+1, wrote:
On Wednesday, 24 October 2012 08:57:21 UTC+1, Roel Baardman wrote:

My money would be on a Particle Image Velocimetry (PIV) based

solution.



Largely because this is technology which is extremely widely used

(every laser mouse does it in hardware).



Optical mice use integrated circuits like the Agilent ADNS-2620:

http://www.datasheetcatalog.org/data...yqglz0hcy..pdf



So, unless you can form a 2D image of the particles'

velocity and have the ic process that image, I don't

see how you would do it.



I've heard about model airplanes using it to stabilize bank angle

(more speed = lower wing).



Quite possible. Many years ago I saw one of the

optical mice in the form or a ring on a finger.

With the appropriate focussing distance, the room

itself was used as a mouse pad.

Whatever the tech ultimately used to achieve this, what will it do to the sport? I know some people thought flight computers would ruin the sport, then GPS, then moving maps, but thus far it is still far from ruined. But visible thermals sounds like the biggest step yet towards reducing the challenge. What do others think?

On Wednesday, October 24, 2012 5:35:51 AM UTC-5, waremark wrote:
On Wednesday, October 24, 2012 10:50:01 AM UTC+1, wrote:

On Wednesday, 24 October 2012 08:57:21 UTC+1, Roel Baardman wrote:



My money would be on a Particle Image Velocimetry (PIV) based



solution.







Largely because this is technology which is extremely widely used



(every laser mouse does it in hardware).







Optical mice use integrated circuits like the Agilent ADNS-2620:



http://www.datasheetcatalog.org/data...cyqglz0hcy.pdf







So, unless you can form a 2D image of the particles'



velocity and have the ic process that image, I don't



see how you would do it.







I've heard about model airplanes using it to stabilize bank angle



(more speed = lower wing).







Quite possible. Many years ago I saw one of the



optical mice in the form or a ring on a finger.



With the appropriate focussing distance, the room



itself was used as a mouse pad.



Whatever the tech ultimately used to achieve this, what will it do to the sport? I know some people thought flight computers would ruin the sport, then GPS, then moving maps, but thus far it is still far from ruined. But visible thermals sounds like the biggest step yet towards reducing the challenge. What do others think?

it will turn a flight that previously would've gone 300km into a 500km flight. would probably lead to a huge increase in the number of pilots flying cross country and in contests. records would start falling everywhere. i can't wait

Whatever the tech ultimately used to achieve this, what will it do
to the sport? I know some people thought flight computers would
ruin the sport, then GPS, then moving maps, but thus far it is
still far from ruined. But visible thermals sounds like the
biggest step yet
towards reducing the challenge. What do others think?

I think it actually doesn't matter what people think. Technology
will become available for the masses sooner or later, which will
challenge both pilots and contest organisers to think outside the
box.

Pilots will have to deal with more (sources of) information, and
will have to prioritize.
Contest organizers must find new ways to challenge pilots.

Besides this, the question is if remote detection will change the
field a lot. The same arguments hold for this as for the discussion
about powerFLARM I think.

Personally I am an aerobatic gliderpilot (and there's no tech for us
at all!), so this doesn't affect me directly. The only advantage is
that I can probably glide further when I decide to go cross-country
one day.

Whatever the tech ultimately used to achieve this, what will it do to the sport? I know some people thought flight computers would ruin the sport, then GPS, then moving maps, but thus far it is still far from ruined. But visible thermals sounds like the biggest step yet towards reducing the challenge. What do others think?


I wrote a short Soaring Magazine article a while ago, thinking about what thermal detectors might mean,

http://faculty.chicagobooth.edu/john..._detectors.mht

or link from

http://faculty.chicagobooth.edu/john...dex.htm#corner

Short version: Even a wingspan range would make a huge difference. Flying airplanes without engines will never be easy. Thermal detectors could dramatically improve the sporting experience, as they could mean the end of gaggling, leeching, team flying, etc. And think about how nice it would be at the end of the day to know for sure that there aren't any thermals left so you'd better stop trying and land.

John Cochrane

On a few occasions, I have observed soaring birds fly quickly towards a point where they found a thermal - sometimes a distance of about a kilometer. The speed and direction of them indicated to me that they were flying to an objective and not just hunting randomly. If so, this means that they can detect thermals remotely using their senses. If we can figure out how they are doing this, there is a chance we can build instruments to replicate their method.

Having studied the possibility of using electrostatic methods (thermals advect space charge from the ground and dust devils are actively charged by particle collision), this is very short range and not likely the mechanism birds are using. I would guess it has to be visual.

Mike

On Wednesday, October 24, 2012 9:36:48 AM UTC-6, Mike the Strike wrote:
On a few occasions, I have observed soaring birds fly quickly towards a point where they found a thermal - sometimes a distance of about a kilometer.. The speed and direction of them indicated to me that they were flying to an objective and not just hunting randomly. If so, this means that they can detect thermals remotely using their senses. If we can figure out how they are doing this, there is a chance we can build instruments to replicate their method.



Having studied the possibility of using electrostatic methods (thermals advect space charge from the ground and dust devils are actively charged by particle collision), this is very short range and not likely the mechanism birds are using. I would guess it has to be visual.



Mike

I suspect it is visual for birds. The have far better vision than we and can probably see small objects like seeds rising with the thermal. They may also possess special visual processing centers in their brains evolved to detect thermals.

I suspect the "one shot" DARPA program works the same way by detecting embedded objects like dust and seeds moving across the field of view then using powerful algorithms to process the data. Range the objects as they move across the field and the direction and speed of the wind can be determined.

What's interesting to me is the comment that the device will work out to the maximum effective range of currently fielded sniper rifles. .50 caliber rifle ER's can exceed 3000 meters. There is also a comment elsewhere indicating the DOD wants to issue this to every soldier so it can't be too expensive.

Forty years ago I put some effort into electrostatic
L/R detection of thermals. The big probelm is the vertical
component of the general gradient which is at least an order of magnitude
bigger than the horizontal part.
This meant that using tip mounted sensors, the vertical distance
between the tips times the vertical gradient would have to be
compensated for; these days with micro computers and roll rate
sensors,this might not be so difficult.
My approach was to mount probes fore and aft and try to fly
a constant pitch angle. (speed)

There were fields I could detect but never resulting in
finding a thermal by turning slowly L and R.
A real sucess was detecting a field across an airmass boundary
( a weak pseudo front, shown by haze) and confirmed by
several passes each direction. There was weak lift
but the haze variation gave this away and I only detected the
field as I flew through it.
The 25m plus spans of some gliders could allow a better
signal.

I await further initiatives with interest.

John Firth, old but no longer bold pilot.

On a few occasions, I have observed soaring birds fly quickly towards a
p=
oint where they found a thermal - sometimes a distance of about a
kilometer=
.. The speed and direction of them indicated to me that they were flying
to=
an objective and not just hunting randomly. If so, this means that they
c=
an detect thermals remotely using their senses. If we can figure out how
t=
hey are doing this, there is a chance we can build instruments to
replicate=
their method.
=20
=20
=20
Having studied the possibility of using electrostatic methods (thermals
a=
dvect space charge from the ground and dust devils are actively charged
by
=
particle collision), this is very short range and not likely the
mechanism
=
birds are using. I would guess it has to be visual.
=20
=20
=20
Mike

I suspect it is visual for birds. The have far better vision than we and
c=
an probably see small objects like seeds rising with the thermal. They
may=
also possess special visual processing centers in their brains evolved
to
=
detect thermals.

I suspect the "one shot" DARPA program works the same way by detecting
embe=
dded objects like dust and seeds moving across the field of view then
using=
powerful algorithms to process the data. Range the objects as they move
a=
cross the field and the direction and speed of the wind can be
determined.

What's interesting to me is the comment that the device will work out to
th=
e maximum effective range of currently fielded sniper rifles. .50
caliber
=
rifle ER's can exceed 3000 meters. There is also a comment elsewhere
indic=
ating the DOD wants to issue this to every soldier so it can't be too
expen=
sive.

On Oct 24, 9:01*am, Bill D wrote:
On Wednesday, October 24, 2012 9:36:48 AM UTC-6, Mike the Strike wrote:
On a few occasions, I have observed soaring birds fly quickly towards a point where they found a thermal - sometimes a distance of about a kilometer. *The speed and direction of them indicated to me that they were flying to an objective and not just hunting randomly. *If so, this means that they can detect thermals remotely using their senses. *If we can figure out how they are doing this, there is a chance we can build instruments to replicate their method.

Having studied the possibility of using electrostatic methods (thermals advect space charge from the ground and dust devils are actively charged by particle collision), this is very short range and not likely the mechanism birds are using. *I would guess it has to be visual.

Mike

I suspect it is visual for birds. *The have far better vision than we and can probably see small objects like seeds rising with the thermal. *They may also possess special visual processing centers in their brains evolved to detect thermals.

I suspect the "one shot" DARPA program works the same way by detecting embedded objects like dust and seeds moving across the field of view then using powerful algorithms to process the data. *Range the objects as they move across the field and the direction and speed of the wind can be determined.

What's interesting to me is the comment that the device will work out to the maximum effective range of currently fielded sniper rifles. *.50 caliber rifle ER's can exceed 3000 meters. *There is also a comment elsewhere indicating the DOD wants to issue this to every soldier so it can't be too expensive.

The patented Isreali system referenced in the article does not use
dust and seeds blown in the wind, it looks at the scinitllation of the
laser illuminated target due to the atmospheric turbulence blowing
across the line of sight. Sort of like the shimmering of a mirage.
It gives a path averaged crosswind speed from the observer to the
target.