thermal IR camera unit (£1,900 inc.VAT (2011), incorporating a window heater - 6w/2w
lithium-ion battery (£15
voltage stabiliser (£30 - this is power over-rated by an order of
PVR (£57). The original,
digital recorder was replaced by a PVR, 23 September 2011.
The rig with the new PVR
(the battery is external for
Half frame crop of image from the new PVR, 23 September
The price of this
camera is outside the remit of our normally cost-conscious work. However, we
expect the price (and weight) of handheld, thermal imagers to continue to fall in
the near future.
For simplicity, we considered
handheld, thermal IR units (1,
etc), but none offered this resolution,
field of view, at this price (August 2011).
Is such an approach a useful
and viable option for archaeological KAP, as the
infra-red has already proved to be? That is the question
we hope to answer. The two main considerations are (1) The
slow speed of capture of individual frames and (2) The
optimal environmental conditions for camera deployment.
is available as a free download for
using the plugin Deshaker filter (Download),
but we have not used it so far.
A HQ FF4.0 kite has been
to cope with the rig over a wider range of wind speeds. We also have
a Power Sled 81, but we are more trusting of the consistency of performance of
HQ flow forms in strong winds. Although we have not lost a camera
since we started KAP in 2007, infrequently, sleds can shear out of the sky.
Normally, this is not a problem, but it would be a disaster and
dangerous with a £2k, 1.5kg payload.
A second PathFindIR camera was
ordered in April 2012 for work on the DART Project.
This camera will now be used for pole work
on an aluminium mast.
Configuration 3 July
To reduce weight, the 60w input
(235g) has been replaced with one rated at ~10w (22g).
Input Voltage: 11.5
to 35.0 Volts
Output Voltage: 10
Line regulation: 10
Load Regulation: 12
Operating temperature: 0
65 to 150°C
The unit (CCVS3 from e-bay)
thermal overload and short
off-the-shelf voltage stabilisers are available for around £10 each. These are
solid state replacements for electro-mechanical devices used on
older cars to regulate the voltage to the control panel. The
4800mAh battery (176g) has also been replaced with a smaller one rated at
1800mAh (80g). The PVR (149g) has been replaced with a smaller,
lighter model (82g). The total weight of the rig is now 1.16kg.