On the topic of dead pixels, a commercial microbolometer will generally have one of two dead pixel specifications: Type 1 = 99.9% or better operational pixels, Type 2 = 99.8% operational pixels. Only 0.1 % between them and this is the normal range found in a manufacturers product range.
pat.cynafab_temp_300-30_rawCal.png bad pattern pixels: 23/32136 (0.072 %)
pat.marshallh.raw.000000007.0x1.png bad pattern pixels: 28/32136 (0.087 %)
pat.frenky_osc_motor.raw.000000027.0x1.png bad pattern pixels: 79/32136 (0.246 %)
23/(32136-2143): 0.077 %
I was wondering what the minimal working distance of the Seek Thermal device is.
The minimal working distance is the minimal distance from the lens to an object with the requirement that the object is in focus.
I'm performing some research on liquid droplets (2 < 3 mm) which are several degrees hotter than the environment and I just need a thermal image of them (relative temperature is OK) without spending thousands of dollars of tax money. There are some cheap lenses available (ZnSe) which can help a lot with this experiment but it would be nice if there are some people who can provide me some values about working distances with and without these lenses.
It would also be great if someone just deposits a small droplet which is heated a bit on a surface, just to test.
Another question is about the possibility of connecting the Seek Thermal device to a PC (windows) with some kind of trick and still running the standard app provided for a device with Android as an operating system.
kalman_deinit
kalman_init
kalman_process
_Z10med5_fixedPi
_Z10med9_fixedPi
_Z11median_compPiS_
_Z13kalman_updateiP14kalman_private
_Z14histogram_clipPjj
_Z15create_transferPjPtj
_Z15median5_processPtS_ii
_Z15median9_processPtS_ii
_Z16bilateral_filterPtS_iiff
_Z16histogram_createPtjjjPjS_
_Z16median5x_processPtS_ii
_Z16median9f_processPfS_ii
_Z7aeg_abss
_Z7filter_PtPij
_Z8opt_med3Pt
_Z8opt_med4Pt
_Z8opt_med5Pt
_Z8opt_med9Pt
_Z9opt_med9fPf
However those Seek android app thermal images and video looks very bad, so looking for ways to use more advanced filtering including hardware circular motion support to "see through" those blanked hexagon patent pixels.its nice for that price... but gradient....
Do you need to monitor experiment, so Android app and PC apps running at the same time or there are other requirements there in this project?
The hardware circular motion is a nice way of capturing good images. You need to do something like that to solve the blanked pixel problem.
Dark Pixels. No great mystery here. Every 15th pixel is intentionally blanked to avoid a potential patent infringement. Seek has an updated design for future product that eliminate the need for this measure. With the effective blur length of a 12 micron pixel resolving 8-13 micron Radiation, loss of single isolated pixels does not (in itself) degrade image quality."
Seek has an updated design for future product that eliminate the need for this measure
What do they mean, which kind of measure is hidden in those hexagon pattern pixels-sensor temperature detection?QuoteSeek has an updated design for future product that eliminate the need for this measure
The lens you need is designed to be non inverting and to sit in front of the cameras objective lens.
I find that I can't really see anything at long distances with the seek which is why I was curious, but I guess you can't expect too much from a low cost imager like this.
Has any1 tryed to isntall this lens http://therm-app.com/product/19mm-lens/ on to a flir e4 cammera since it is fairly cheap 19mm narow fov lens that could give a longer detection range (at least i hope so ) there would be some housing modifications since i dont think the threads on the lenses are the same...
I find that I can't really see anything at long distances with the seek which is why I was curious, but I guess you can't expect too much from a low cost imager like this.Trying to figureout and calculate if those lenses mentioned in this threadHas any1 tryed to isntall this lens http://therm-app.com/product/19mm-lens/ on to a flir e4 cammera since it is fairly cheap 19mm narow fov lens that could give a longer detection range (at least i hope so ) there would be some housing modifications since i dont think the threads on the lenses are the same...Optical specs below:
Maybe with custom lens holder it could be possible mount those lenses and add also custom shutter with cicular motion plate inside similar to this from Flir E4 and still be in the range below $500 with Seek Thermal "enhanced" sensor (firmware hacked).
@Aurora
Any good tutorials how to choose correct lenses for given thermal sensor unit parameters?
these are a slightly cheaper option than the therm-app lenses. they work on the therm-app, and there is a larger selection.
http://eom.umicore.com/en/infrared-optics/product-range/35-mm-f-1.1/
3) The gradient issue is pretty bad.
....
I'm seeing about a 12 deg F difference between opposite corners. Attached is a picture of a uniform surface.
./sts_analysis: Calibration image surface: z0: 8003.694395287 zx: 8008.635499644 zy: 8002.172119205 zmin: 7997.231014848 zmax: 8010.157775727 dz: 12.926760879