[Techtoolslist] Using Flir android thermal camera to track down short

[John Robertson]

On 2019/09/10 9:44 a.m., Dave McGuire wrote:
> On 9/10/19 10:58 AM, John Robertson wrote:
>> What is interesting is that a number of digital cameras will work in the
>> IR range, so I've thought of getting a visible light filter whenever I
>> again order some lens from Edmonds to play with some of my cameras to
>> see how far they actually see. I have used camera phones for checking IR
>> diodes (including laser diodes on CD players) and the older iPhones
>> worked for that - which was handy for troubleshooting trough optos.
>    While CMOS and CCD imagers can be very handy for visualizing the
> near-IR output from IR LEDs, LASERs, and such (750-900nm or so), this
> approach won't get you very far for thermal imaging.  The IR response of
> CMOS and CCD imagers doesn't extend up into the thermal IR wavelength range.
<snip>
>
>    Due to CMOS/CCD sensors' lack of sensitivity in this region, thermal
> imagers are usually implemented using a 2D array of thermopiles,
> essentially tiny stacks of thermocouples, one per pixel, with solid
> germanium optics.
>
>                -Dave
>
Thanks Dave!

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