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! -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/