Polarizer & retarder:
https://www.youtube.com/watch?v=ycY2mUZHS84

Load cell:
https://www.youtube.com/watch?v=QXHb6a_k7So

Rotary encoder:
https://www.youtube.com/watch?v=dMBrR4gDi3s

Linear transducer: 
https://www.youtube.com/watch?v=9vQ7ItEisdw

Silicon photodiode: 
https://www.youtube.com/watch?v=_QRm475V7-c

Thermoelectric assembly: 
https://www.youtube.com/watch?v=kL-j2qaw_OI