40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Message ID: 14041     Entry time: Fri Jul 6 12:12:09 2018
Author: Annalisa 
Type: Configuration 
Category: Thermal Compensation 
Subject: Thermal compensation setup 

I tried to put together a rudimentary heater setup. 

As a heating element, I used the soldering iron tip heated up to ~800°C.

To make a reflector, I used the small basket which holds the cork of champains battles (see figure 1), and I covered it with alumnum foil. Of course, it cannot be really considered as a parabolic reflector, but it's something close (see figure 2).

Then, I put a ZnSe 1 inch lens, 3.5 inch FL (borrowed from TCS lab) right after the reflector, in order to collect as much as possible the radiation and focus it onto an image (figure 3). In principle, if the heat is collimated by the reflector, the lens should focus it in a pretty small image. Finally, in order to see the image, I put a screen and a small piece of packaging sponge (because it shouldn't diffuse too much), and I tried to see the projected pattern with a thermal camera (also borrowed from Aidan). However, putting the screen in the lens focal plane didn't really give a sharp image, maybe because the reflector is not exactly parabolic and the heater not in its focus. However, light is still focused on the focal plane, although the image appears still blurred. Perahps I should find a better material (with less dispersion) to project the thermal image onto. (figure 4)

Finally, I measured the transmitted power with a broadband power meter, which resulted to be around 10mW in the focal plane. 

Attachment 1: IMG_1887.jpg  61 kB  Uploaded Fri Jul 6 13:29:50 2018  | Hide | Hide all
IMG_1887.jpg
Attachment 2: IMG_1884.jpg  372 kB  Uploaded Fri Jul 6 13:30:25 2018  | Hide | Hide all
IMG_1884.jpg
Attachment 3: IMG_1883.jpg  425 kB  Uploaded Fri Jul 6 13:30:46 2018  | Hide | Hide all
IMG_1883.jpg
Attachment 4: IR20180706_0358_labels.png  521 kB  Uploaded Fri Jul 6 15:43:12 2018  | Hide | Hide all
IR20180706_0358_labels.png
ELOG V3.1.3-