Frequency response test for thermal imaging sensor
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- Опубликовано: 23 июл 2011
- I am testing the frequency response of the TPS334 IR sensor. My very crude tests agree with the datasheet, which means that the image scan time will be very long for high contrast images. Many low-cost microbolometer-based thermal imaging cameras have 80x80 sensors (6400 pixels). At a 10Hz pixel clock (-3dB sensitivity from datasheet), the frame scan time would be 640 seconds, or nearly 11 minutes. Yikes! At 100Hz, the sensor would only produce an output level of %10 of its DC capability, and still require just over a minute to scan the whole frame. Obviously, this will not be a "live video" system, but might still produce some interesting still image thermographs.
I am working on other methods of sensing long-wave IR too. More later. 
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Hi Ben, I doubt you will get to actually read this comment because your channel has since become humongous and there must be thousands of comments filling up you're inbox every single day, but I have to try 😁 Congratulations on 700k subs BTW! You're already 70% of the way to that elusive and very much deserved number with six!!! zeroes 👍! I'm proud to say that I am one of the dedicated few who have stuck with you from the very beginning It's been a true pleasure to see you grow with every single project you post; after which you venture into the great unknown world of wondrous science and yet *_every_single_time_* you manage to surprise us with a bigger, harder, badder and more complicated incredible project than the last one. It is incredibly inspiring to watch, and I learn so much from your videos that to (honestly, no joke) puts everything I've learned during my scientific bachelor education to shame! I hope you keep 'em coming! I'd you've got the time, please read my two questions below. My brain is almost drooling in anticipation of the delicious awesome science information that should be contained in those follow up videos; the only thing is that I can't find them. No biggie! It's late and I probably missed them, in that case please accept my sincere apologies! 🥴☺️ Good luck with your science endeavours Ben! I wish you (and your shop) all the best of luck on your epic voyages 😁👍
-Rikkert from The Netherlands signing off! 😋😀
(On another unrelated note, do you perhaps know where the follow-up to the ultrasonic soldering video is where you promised to show us how you made your custom allow with a vacuum furace? Or, perhaps where I can find the follow-up the this video, where you said you'd put two mirrors in front of the infrared imaging device to allow it to scan a view cone, thus producing a thermal infrared image of your shop with the single-pixel from a thermal-infrared-thermometer-device?)
The project looks really interesting, It's going to be very cool to see the mirrors in action, Im looking forwad to see more updates !
One idea I had for something else was using some of the single pixel camera techniques. Basically reflecting the image off a DLP/DMD chip and onto a single receptor. By using a pseudo random pattern you can build up a complete image from a few thousand passes. Much less than reading sequentially through the DMD. It also has the advantage that you can do hyperspectal imaging by adding sensors with different response characteristics.
plz .where is the next video of this series
I've been looking into making a crude FTIR spectrometer for chemistry exploration. One of the biggest issues I'm running into is with specing out components that will be sensitive enough without being super expensive. This TPS334 looks like a good option, but only goes up to 1400 wavenumber (1/cm), while FTIR measurements need to go up to 3200 wavenumber (or so). Even so, this might point me in the right direction, so I thank you for posting!
Super cool. Um, where's the next video?
very nice I always wanted to build one, but when I saw the other video for servo controled thermal imaging, I start building mine, FPGA is good way to start. Im using beagleboard with the OMAP3 proccessor for capturing since the thermopile response is very low. i'll post my progress as soon i finish it, i know its a long journy but i'll try.
Good luck to you, and thank you for sharing.
Great Video !! Thanks so much for posting ! May I assume you made this before any Transcranial Magnetic Stimulation ? You seemed to be stringing words together just fine!
DLP one pixel camera work was pioneered at Rice University.
I for one would be very interested about beginner level FPGA stuff and your experiences and comments related to that. FPGAs are very powerful but compared to MCUs, they aren't that easy to get started. Having a suitable project for FPGA is important for learning but choosing 'correct' hardware and software for that is hard. You've already taken those steps.
where's the next video?
Update please 🥺 😔
Gave up on it?