FLIR One large range?

[JacobWhitt]

So, has anyone else noticed the range in temperature of the FLIR One? The below image is of the FLIR One taking an image every 2 seconds over a period of 22 minutes and 30 seconds. The FLIR device tunes whenever it senses a large change in temp, or after 2 minutes and 15 seconds. The spikes you see are those 2 minute and 15 second marks. This is over 10 of those tuning cycles with a total of 675 captures in all. This was pointed and a 30C blackbody.

[JacobWhitt]

Let me also say, this was the center 3x3 pixels I used.

[tomas123]

I wrote about this temperature drift a year ago:

I made a Flir One G2 run down test as answer to this seek post:
...

with the source code from
https://www.eevblog.com/forum/thermal-imaging/question-about-flir-one-for-android/msg846130/#msg846130
I wrote all logs to file and generated a excel sheet.

This was a cold start of the Flir One and the log begins 1 minute after shutting on.
The battery reaches only 57 minutes, but it's more as expected:

The FLIR One houses its own battery source that can power the device for more than 45 minutes of continuous use.

The blue line is the average temperature of 2x2=4 center pixels. The measured temperature was a wall with a constant temperature over the hour.
The F1 G2 needs 10 minutes until stabilization.

The vertical green lines mark the FFC shutter movements.

The shutter interval is constant 135 seconds after 5 minutes runtime.

After FFC the temperature needs 30 seconds to settle (2 sec down + 10 sec up + 20 seconds to stabilize)   
a sample at 00:25:50

Code: [Select]

Time    Spot FFC
0:25:50 19,6
0:25:51 19,6 Shutter
0:25:52 19,3 Shutter
0:25:53 19,1
0:25:54 19,0
0:25:55 19,1
0:25:56 19,3
0:25:57 19,5
0:25:58 19,7
0:25:59 19,9
0:26:00 20,1
0:26:01 20,2
0:26:02 20,3
0:26:03 20,3
0:26:04 20,3
0:26:05 20,3
0:26:06 20,3
0:26:07 20,3
0:26:08 20,3
0:26:09 20,2
0:26:10 20,2
0:26:11 20,1
0:26:12 20,0
0:26:13 20,0
0:26:14 19,9
0:26:15 19,9
0:26:16 19,8
0:26:17 19,7
0:26:18 19,7
0:26:19 19,7
0:26:20 19,7
0:26:21 19,6
0:26:22 19,6
0:26:23 19,6
0:26:24 19,6
0:26:25 19,6
0:26:26 19,6
0:26:27 19,5
0:26:28 19,5
0:26:29 19,5
0:26:30 19,4
0:26:31 19,4
0:26:32 19,4
0:26:33 19,4
0:26:34 19,4
0:26:35 19,4
0:26:36 19,4
0:26:37 19,4
0:26:38 19,4
0:26:39 19,5
0:26:40 19,5
0:26:41 19,5
0:26:42 19,4
0:26:43 19,5
0:26:44 19,4
0:26:45 19,4
0:26:46 19,3
0:26:47 19,3
0:26:48 19,5
0:26:49 19,4
0:26:50 19,5
0:26:51 19,5
0:26:52 19,4
0:26:53 19,4
0:26:54 19,5
0:26:55 19,4
0:26:56 19,4
0:26:57 19,5
0:26:58 19,5
0:26:59 19,5
0:27:00 19,5
0:27:01 19,4
0:27:02 19,4
0:27:03 19,5
0:27:04 19,5
0:27:05 19,5
0:27:06 19,5
0:27:07 19,5
0:27:08 19,6
0:27:09 19,6
0:27:10 19,6
0:27:11 19,6
0:27:12 19,7
0:27:13 19,7
0:27:14 19,6
0:27:15 19,6
0:27:16 19,6
0:27:17 19,7
0:27:18 19,6
0:27:19 19,6
0:27:20 19,6
0:27:21 19,6
0:27:22 19,7
0:27:23 19,7
0:27:24 19,7
0:27:25 19,7
0:27:26 19,7
0:27:27 19,7
0:27:28 19,6
0:27:29 19,6
0:27:30 19,6
0:27:31 19,8
0:27:32 19,7
0:27:33 19,7
0:27:34 19,7
0:27:35 19,7
0:27:36 19,7
0:27:37 19,6
0:27:38 19,6
0:27:39 19,6
0:27:40 19,5
0:27:41 19,6
0:27:42 19,6
0:27:43 19,6
0:27:44 19,7
0:27:45 19,7
0:27:46 19,6
0:27:47 19,6
0:27:48 19,6
0:27:49 19,6
0:27:50 19,6
0:27:51 19,6
0:27:52 19,6
0:27:53 19,6
0:27:54 19,6
0:27:55 19,7
0:27:56 19,7
0:27:57 19,6
0:27:58 19,7
0:27:59 19,6
0:28:00 19,6
0:28:01 19,7
0:28:02 19,7
0:28:03 19,7
0:28:04 19,7
0:28:05 19,7
0:28:06 19,7
0:28:07 19,6 Shutter
0:28:08 19,4 Shutter
0:28:09 19,0
0:28:10 18,9
...
PS: all described effects (shutter interval, temperature drift) you also get with the Flir One Ap from google play store