Detector Test System (I)
More figures>EMIR is starting the electro-optical characterisation of the HAWAII-2 FPA Rockwell IR detector plus the read-out controller.
To do this, a system is being built at the IAC headquarters, which consists in a cryostat equipped with a filter wheel mechanism to select different filters in the light beam to the detector and a closed cycle cooler.
The detector is placed in the fan-out board, where both, the electronical components interacting directly with the detector and the thermal connections, are included.
The following pictures show the steps of the fabrication and AIV process of the system:
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| Fig. 1. Components of the filter wheel mechanism before integration. |
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| Fig. 2 Front and back views of the filter wheel mechanism (integrated) during the room temperature operation tests. The box at the side of the filter wheel mechanism is the motor drive controller of the unit. | |
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| Fig. 3 Detector fan-out boards before population of components. Detector socket, ceramic chip carrier (dummy) and some connectors in front. Special thanks to the manufacturers: technical director Javier Ángel and staff at Lab Circuits Company (Santa María de Palautordera, Barcelona, SPAIN). |
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| Figs. 4. Detector fan-out board after population of components and cabling, ready for initial tests on the multiplexer. Only 4 read-out channels will be used in this configuration. | |
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| Fig. 5. Vacuum test of the cryostat. The cryostat of the Detector Test System (gold cylinder in the pictures), has been integrated and vacuum tested, reaching values of the order of 10-5 mbar. The metallic hose at the side is the vacuum pump connection (pumping mechanism is resting at floor). The mechanism connected on top is the close cycle cooler. | |||