Today we test B2 solenoid with shutter base and thermal paste,see Fig.1.

First we test the B2 solenoid without heat sink, we rise the current up to 240mA/18V to move the solenoid, then decrease the current down to 110mA/8.26V
The start temperature is 27.7 deg C (13:29), 90 mins later, the temperature rise to 34.6 (15:13),see Fig.2, this temperature is lower than yesterday's test which is without shutter base, the temperature of  the other side of the solenoid is 36.9 deg C, see Fig.3

Then we put the thermal paste on the surface between the soleniod and solenoid base, and the surface between solenoid base and shutter base, in this process, we found that the spring of the solenoid can be adjust manually, see FIg.4, we  loose the spring of A1 and test the current to move it, the current is about 200mA, and the minimum current is around 60mA, it is lower than before, actually it make sense, the needed force is smaller because the spring is loosed. Then we loose the spring of solenoid B2, it turn out that the it only need 180mA/13/5V to move the solenoid and the minimum current to keep it open is down to 85mA/6.38V, it was 240mA/110mA.

Finally we the the solenoid at lower minimum current (85mA/6.38V).
The start temperature is 31.2deg C (16:03), 2 hours later, the temperature rise to 34.1 (17:58),see Fig.5,  The temperature increase by only 3 deg, it might because of the lower current. And the hot part is on the bottom of the solenoid, the top part is not so hot, we believe that  this is due to thermal paste.
The temperature of  the other side of the solenoid is differ as the position of  the camera change see Fig.6-8,
Fig.6-36.5 deg C, 
Fig.7-34.9 deg C, 
Fig.6-31.8 deg C, 
Next we need figure out the calibration of the FLIR camera.