Tag Archives: infrared

Interval Infrared Photography of Dust

 

The dust level in one room of my house reached 3.5 million particles per cubic meter, where the particles were detected at a size of less than two microns (with some potentially as small as 500 nanometers) – using a Dylos 1100 (“Pro” version) electronic particle detector.  I have several detectors of various sorts. Often, the alarm on one of them is triggered in the middle of the night.  The other detectors do not have audible alarms.  In search of the cause of huge night-time spikes in the level of particulates, I used an IR camera to take shots of the affected room.

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Doing Interval Photography with a Sigma SD14

Figure 1: Homemade “DIY” power adapter for Sigma SD14

I really have come to appreciate the Sigma SD14 camera that I’ve been using for over a month or so, applying it for IR photography.  It really shines there, due to the Foveon class sensor that outdistances most competitors in terms of IR sensitivity.  I have captured time-lapse photos that I believe contain as low as 1.5 microns (high mid-infrared) wavelength light.  This is ordinarily not possible with the standard Bayer sensor in most camera brands, based on the info (veracity unknown) – that I’ve come across in my internet meanderings.

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Infrared Photography with an SD14

Figure 1An unexpected explosion of infrared on my dry erase board.

Is there such a thing as an infrared bomb?  I’m hard pressed to explain the picture in figure 1, one of the first infrared photos I’ve taken with the SD14.  I had just taken the shot in figure 2 (a photo of me looking like an infrared zombie) – and had gotten up to check the camera.  Without touching the tripod, I snapped off another shot of the dry erase board that hangs on the wall behind the chair I had just vacated.  The photo of figure 1 emerged as a result.

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A Human Powered IR Detector

Figure 1:   A low pass (visible light blocking) filter,  that allows infrared to pass thru it unblocked.

Normally, IR is invisible to the human eye.  So, how could a person detect infrared radiation with the eye?  It can be done indirectly.  In figure 1 is the low pass visible light blocking filter known to all IR photographers.   It blocks visible light (notice that it is jet black, even when held in front of a bright lamp).

The thing is, the human eye can detect IR already.  It can detect even down to the level of upper level “far” IR!

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