ExoMars UV Laser diode thermal vacuum test Alex Rousseau.
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Transcript of ExoMars UV Laser diode thermal vacuum test Alex Rousseau.
![Page 1: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/1.jpg)
ExoMars UV Laser diode thermal vacuum test
Alex Rousseau
![Page 2: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/2.jpg)
Test setup
• Used ExoMars CCD test vacuum chamber. LN2 cooling with heaters backing off LN2.
• Fully automated thermal control system.• Rotary vacuum pumped chamber (5x10-3
mBar).• Photodiode fixed to chamber viewport to
measure UV laser diode output.• Temperatures and photodiode output logged
at 1 minute intervals.
![Page 3: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/3.jpg)
Test equipment
![Page 4: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/4.jpg)
Test setup (Cont.)
• UV laser diode assembly installed between two cold fingers and PID closed control loop temperature sensor installed on the laser diode mount (as close as possible to diode).
• Two temperature logging sensor installed on laser diode mount.
• Bench PSU connected through vacuum feed through for PCB V & I supply.
![Page 5: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/5.jpg)
Laser diode installation in TV chamber
![Page 6: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/6.jpg)
Test profile
• Cold non operational T: -150°C• Hot non operational T: +50°C• Hot operational T: +25°C• Cold operational T: ≥60°C
![Page 7: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/7.jpg)
Test results – thermal profile
![Page 8: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/8.jpg)
Test results – UV Laser diode output vs temperature
![Page 9: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/9.jpg)
Test results – UV Laser diode output at test points
![Page 10: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/10.jpg)
Test results – UV Laser diode temperature transition rates
![Page 11: ExoMars UV Laser diode thermal vacuum test Alex Rousseau.](https://reader035.fdocuments.net/reader035/viewer/2022062620/551b30115503465c7e8b48ca/html5/thumbnails/11.jpg)