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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