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thermalsensors [2020/11/07 21:00] wf68spef |
thermalsensors [2021/02/02 16:10] (current) wf68spef |
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| ====== Thermal sensors ====== | ====== Thermal sensors ====== | ||
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| + | ===== Comparison of cameras ===== | ||
| + | |||
| + | https://github.com/OpenHD/Open.HD/wiki/Thermal-Cameras | ||
| ===== Talk with acalbi sales engineer ===== | ===== Talk with acalbi sales engineer ===== | ||
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| * https://www.thingiverse.com/thing:2581533 | * https://www.thingiverse.com/thing:2581533 | ||
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| + | ===== HTI ===== | ||
| + | |||
| + | * HT-201 / HT-301 | ||
| + | * 320x240 pixel | ||
| + | * 32° Opening angle | ||
| + | * https://www.amazon.de/Thermal-Infrarot-W%C3%A4rmebildkamera-Mobiltelefone-Aufl%C3%B6sung/dp/B07Y4PJF2S/ref=sr_1_1?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=ht-201+thermal&qid=1607201370&sr=8-1 | ||
| ===== Seek compact ===== | ===== Seek compact ===== | ||
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| * < 9 Hz Frame Rate | * < 9 Hz Frame Rate | ||
| * 1,000 ft. Detection Distance (~300m) | * 1,000 ft. Detection Distance (~300m) | ||
| - | * waterproof | + | * not waterproof! |
| * ~250€ | * ~250€ | ||
| + | * lensmaterial Chalcogenide | ||
| ==== Usage ==== | ==== Usage ==== | ||
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| Its visible, that thin plastics are a option. The actual thinnest one doesnt protect at all, its too thin. But maybe we can find some cheap fitting material, or we use the professional thermal plastics. | Its visible, that thin plastics are a option. The actual thinnest one doesnt protect at all, its too thin. But maybe we can find some cheap fitting material, or we use the professional thermal plastics. | ||
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| + | ===== Calibration ===== | ||
| + | |||
| + | * Images of water are more cold at center than edges | ||
| + | * Due to vignetting | ||
| + | * https://en.wikipedia.org/wiki/Vignetting | ||
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| + | * Flat field calibration | ||
| + | * Build avg frame over multiple frames and save flat_field_calib | ||
| + | * frame_corrected = frame_raw - flat_field_calib | ||
| + | * Implementation https://github.com/OpenThermal/libseek-thermal/blob/master/src/SeekCam.cpp#L101 | ||
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