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Entry  Mon Nov 9 15:49:58 2020, Aidan, Update, 2um Photodiodes, JPL PD resurrection (cont.) 
    Reply  Tue Nov 10 12:46:34 2020, Aidan, Update, 2um Photodiodes, JPL PD resurrection (cont.) temperature_diff_shield_v_PD.png
Message ID: 2517     Entry time: Tue Nov 10 12:46:34 2020     In reply to: 2516
Author: Aidan 
Type: Update 
Category: 2um Photodiodes 
Subject: JPL PD resurrection (cont.) 

Looks like the temperature difference between the PD and the shield is relatively small. Even the transients when the heater is applied are order 5K. 

This means that, for quick purposes, the shield RTD is a good proxy for the PD temperature. 

The attached data is the difference between PD and shield RTD from circa 5th-6th February 2020.

Quote:

Okay - all the steps in the procedure of eLOG 2476 have been verified as working - with the exception of the RTDs in the chamber.

 With regards to taking dark noise spectra at different biases and temperatures, looks like Raymond took spectra with biases of [50, 100, 200, 400, 600, 1000]mV. If no objections, I’ll stick to that number of measurements. 

I’m a bit pushed for time with other stuff. I wonder if the shield RTD is sufficient to run tests on the system? I’ll go back through the data and see how reproducible the relationship between shield temperature and PD temperature is. If it is reliable then in the interests of time, I’m going to forgo re-installing the extra RTDs in the chamber just now.

 

 

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temperature_diff_shield_v_PD.png
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