Cooling of photodiode by thermoelectric cooling
Cooling of photodiode by thermoelectric cooling
(OP)
I have to cool a photodiode by a thermoelectric peltier module.
The circuit containing the diode look like this.
and the thermoelectric cooler with heatsink look like this.

The cold side of the TEC module is giving -2 degree temp.
The problem is i have to put the Photodiode with circuit board within vacuum.
what is the best way to cool(direct or indirect cooling) the photodiode by the TEC module ?
The circuit containing the diode look like this.

and the thermoelectric cooler with heatsink look like this.
The cold side of the TEC module is giving -2 degree temp.
The problem is i have to put the Photodiode with circuit board within vacuum.
what is the best way to cool(direct or indirect cooling) the photodiode by the TEC module ?





RE: Cooling of photodiode by thermoelectric cooling
RE: Cooling of photodiode by thermoelectric cooling
Do you? What temperature are you trying to achieve?
Why such a gigantic TEC? A photodiode has very little power dissipation, so you're mostly trying to cool convective heating from the environment itself. A smaller TEC would allow direct mounting of the TEC and the photodiode within a vacuum package.
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RE: Cooling of photodiode by thermoelectric cooling
surface mount it to the TEC using the correct TIM (thermal interface material), and then run the leads out through a suitable pass-through to keep things sealed.
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RE: Cooling of photodiode by thermoelectric cooling
RE: Cooling of photodiode by thermoelectric cooling
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RE: Cooling of photodiode by thermoelectric cooling
Perhaps you could cut a window in your vacuum chamber and pot-in a block of copper or aluminium to give you a cold spot in the chamber. Square section to suit the peltier sounds nice but round would probably be easier to make, fit and seal. Make the block with a shoulder to rest on the outside of the chamber wall.
You haven't said whether you are dealing with high vacuum here, if so you have a whole different ball game in terms of materials, sealing etc.
If the entire cct bboard is in the chamber any other heat generated can only conduct to either the cold Photodiode or radiate to the walls of the vacuum chamber (if the delta T is favorable.) So it may be worth cooling the whole board direct to the cold spot.
je suis charlie
RE: Cooling of photodiode by thermoelectric cooling
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RE: Cooling of photodiode by thermoelectric cooling
Is that the vac chamber wall?
je suis charlie
RE: Cooling of photodiode by thermoelectric cooling
If the TEC were outside of and under the package, the heat load would be significantly higher, since convective heating from the air would compete with the TEC. Moreover, if the TEC setpoint was below the dewpoint, the package and window would cause condensation, which could damage the TEC as well prevent efficient collection of a photo signal.
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RE: Cooling of photodiode by thermoelectric cooling
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RE: Cooling of photodiode by thermoelectric cooling
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RE: Cooling of photodiode by thermoelectric cooling
je suis charlie
RE: Cooling of photodiode by thermoelectric cooling
TTFN

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RE: Cooling of photodiode by thermoelectric cooling
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RE: Cooling of photodiode by thermoelectric cooling
je suis charlie