A LOW COST METHOD FOR ENVIRONMENTAL TESTING AT CRYOGENIC TEMPERATURES
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Transcript of A LOW COST METHOD FOR ENVIRONMENTAL TESTING AT CRYOGENIC TEMPERATURES
A LOW COST METHOD FOR ENVIRONMENTAL TESTING AT CRYOGENIC TEMPERATURES
Testing electronics at cryogenic temperatures requires special equipment
Paul AndersonUniversity of Idaho
April 19, 2023 Paul Anderson 2
Overview
Why Create a Cryogenic Testing Chamber? Requirements Low Cost Chamber Low Cost Chamber Control Test Results Improvements to the Design Does the Chamber Meet the Requirements? Conclusion / Recommendations
April 19, 2023 Paul Anderson 3
Why Create a Cryogenic Testing Chamber?
University of Idaho’s Microelectronics Research and Communications Institute (MRCI) recognized a need for a low-cost cryogenic temperature environmental chamber for the development and testing of electronics over a wide temperature range.
April 19, 2023 Paul Anderson 4
Requirements
Portable: One person can move the chamber Efficient: It must use less than one standard
transfer cylinder of liquid nitrogen for one 8 hour test
Capable of any temperature below room temperature to -180°C
Safe Automated real-time temperature monitoring Easy to use for MRCI personnel with a short
training period Adaptable to any type of package pin configuration Low-cost: less than $5,000
April 19, 2023 Paul Anderson 5
Low Cost Chamber
Aluminum cylinder with removable top
4 thermocouples 2-64pin sockets 4 D-Sub connectors for
connection of test signals GN2 gas purge for water
abatement ½ inch lines for liquid
nitrogen input and exhaust of gas out of the chamber
April 19, 2023 Paul Anderson 6
Low Cost Chamber
Liquid Nitrogen supply is from a standard 180L transfer cylinder pulsed into the chamber through a cryogenic solenoid valve
The system is controlled with bench top instruments, GPIB architecture, and NI LabVIEW
April 19, 2023 Paul Anderson 7
Low Cost Chamber Control
LabVIEW Program Controls the
temperature in the chamber
Shows real-time temperature of the chamber
Saves the temperature data to file
April 19, 2023 Paul Anderson 8
Test Results-
Reached -190°C 5°C ripple around
the set point Initial Overshoot of
desired temperatures
5°C ripple
April 19, 2023 Paul Anderson 9
Improvements
Spray Bar New Lid Change in
Thermocouples DAQ Integration Future Improvements?
April 19, 2023 Paul Anderson 10
Improvements: Spray Bar
Capped brass pipe with 18 holes drilled into the walls of the pipe
Adaptor made to allow the use if pipes
Injects LN2 more uniformly into the chamber
Restricts flow of LN2
April 19, 2023 Paul Anderson 11
Improvements: Spray Bar
Results: Less Ripple
1C instead of 5C Removed micro-
pulsing of valve, reducing valve wear
Cost: $100, Parts and
labor
April 19, 2023 Paul Anderson 12
Improvements: New Lid
Screw-on lid damaged during a test
New lid designed for ease of use
New Lid design can be opened faster than old lid could
Easily repairable: if threads on bolts are damaged, old bolts my be cut off and replaced
April 19, 2023 Paul Anderson 13
Improvements: New Lid
Easily repairable: if threads on bolts are damaged, old bolts my be cut off and replaced
Cost: Approximately the same as previous lid
April 19, 2023 Paul Anderson 14
Improvements: Thermocouples
Change from K-Type Thermocouples to E-Type Thermocouples K-Type: 0.75% Error E-Type: 0.5% Error
Cost Difference Negligible
April 19, 2023 Paul Anderson 15
Improvements: DAQ Integration
NI PXI-6289 DAQ system with embedded controller
Interface with NI SCB-68 shielded thermocouple terminal block
April 19, 2023 Paul Anderson 17
Improvements: DAQ Integration
Four Thermocouples sense the temperature inside the chamber
The voltage of each thermocouple measured by four input channels on the NI PXI-6289 DAQ system, coupled with the NI SCB-68 Connector Block.
Benefits: more accurate than a
system using DMMs faster than a system using
DMMs
April 19, 2023 Paul Anderson 18
Final Cost of Materials
Item Cost
Materials for Chamber $350.00
Plumbing supplies $1,700.00
Cryogenic valve $200.00
Miscellaneous $50.00
Total $2,300.00*
*Not including DAQ, DMM, LabVIEW license, or other MRCI equipment. Some Assembly Required Not responsible for injury or death. If you are reading this, I must be really boring.
April 19, 2023 Paul Anderson 19
Does the Chamber Meet All the Requirements? Yes!
Portable One person can move the chamber
Efficient Two or more tests on one 180L transfer cylinder of
liquid nitrogen Low temperature of -196°C possible Safe
Fails to a safe condition Automated
LabVIEW controlled with real-time monitoring Easy to use with only a brief training period Adaptable to any package configuration Low cost
$2,300 for chamber materials
April 19, 2023 Paul Anderson 20
Acknowledgments
Dr. Herb Hess - University of Idaho Tracey Windley - University of Idaho Matthew Braley – University of Idaho Kevin Buck - University of Idaho Dr. Mohammad Mojarradi - JPL Scott Cozy - JPL NASA Jet Propulsion Laboratory NASA EPSCoR