Hyperspectral imaging rig test - a photo on Flickriver

One of my problems with attempting hyperspectral imaging has always been making sure that the alignment between the different images is at least reasonable. Here I have mounted a Therm-App thermal imager on the hot shoe of a Nikon D3100 DSLR. This gives a predictable and repeatable relationship between the two images, although there are still parallax errors (particularly for close items).

In this staged shot the thermal image on the phone screen was taken a few moments earlier and the rig repositioned so that the live view on the camera screen looked right. The parallax error at this close range was very significant.

This setup opens the door to putting several bodies together (a pair of IS PROs for UV and NIR, the D3100 for visible and the Therm-App for LWIR), giving coverage in one image from 14µm up to ~350nm, albeit with a MWIR gap from ~7-1.2µm. (I'll keep my eyes open on eBay for an ad MWIR camera...)

Of the two glasses of water, the one on the left was straight from the cold tap and the one in the right had had a dash of warm water added so that it was a little over lukewarm. The difference is clear in the thermal image but of course indistinguishable in the visible image.

The 6.8mm Therm-App lens was found to have a field of view approximately equivalent to a 28mm lens on a 35mm full frame. It does however exhibit quite strong optical distortions, which will have to be compensated for before thermal images can be overlaid on a visible or other image. (This assumes that the visible camera's lens is distortion-free – a big assumption...).

Comments are warmly welcomed.

For more thermal images covering a diverse range of subjects please visit (and join!) the Therm-App (and others) thermal imaging group at www.flickr.com/groups/therm-app-users/

Taken on: February 3, 2015

Tags:

thermal

thermal image

heat

experiment

hot

invisible

lowres

lwir

microbolometer

infrared

thermalcamera

thermapp

thermogram

thermographic

warm

science

scientific

temperature

weird

weirdscience

cool

night vision

greyscale

falsecolor

8-bit

uncooled

imager

Wärme

Wärmebild

Wärmebildkamera

unsichtbare

Mikrobolometer

Infrarot

Wissenschaft

Wärmetemperaturseltsame

warme

kühle

kalt

Nachtsicht

thermique

microbolomètre

chaleur

infrarouge

thermogramme

chaude

thermographique

étrange

fraîche

vision nocturne

térmica

imagen térmica

térmico de imágenes

calor

infrarrojos

caliente

temperatura

extraña

cálido

frío

fresco

multispectral

hyperspectral « less

Sets appears in: • Thermography

Groups appears in: • Scientific Experiments • Thermal imaging more » • Lasers, HV & Optical Curiosities • photopicturephotographynow *READ DESCRIPTION!* • Beyond Light: Infrared • Full Spectrum Photographer • Effected Cameras (and other photographic items) • thermal images • Therm-App thermal camera users • WavelengthPro « less

Camera: Nikon D700, f/5.6, 1/60 sec, 90mm, ISO 400 (more info) (hide info)

Camera:	Nikon D700
Aperture:	f/5.6
Exposure Time:	0.017 sec (1/60)
Focal Length:	90mm
ISO:	400
Exposure Bias:	0 EV
Flash:	On, Return detected
Exposure Program:	Program AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Gain Control:	Low gain up
Sharpness:	Hard
Color Space:	sRGB
Software:	Ver.1.02
Show full info

Stats: 4,865 views / 2 comments

go back

Link to this photo view:
Link to this photo large view: