ARGmeter Ophir 20C-A-1-Y w/ heatsink

[mhemling33]

I'm a bit surprised that this has not sold, tbh - an Ophir-equipped LPM for $350 is a good deal...

Quick question - what do you think that Ophir head can handle power-wise with that heatsink installed?

I found this video and web page explaining heatsink design for the ophir.

Heatsink outer dimensions 5.08cm x 5.08 cm x 2.54 cm
Heatsink mass 65g

Size of sensor 3.8cm x 3.8cm x 3.4cm

Conduction
Heatsink contact with sensor is roughly 29cm2
29cm2 x 4W/cm2= 116W

If we disregard the bottom since it doesn't have screws forcing contact it is 19cm2 which give you 76W. Both are way over what the sensor is capable of in terms of conduction with the addition of thermal compound.


Disapation

Surface area of heatsink exposed to air is 65cm2 disregarding the "fins".

65cm2 x 1W/6cm2 = 10.83W

If my math if correct it should be able to measure up to 10W.


https://www.ophiropt.com/blog/laser-measurement/heat-sinking-guidelines/

 

[hakzaw1]

bump
good deal