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ANIR adopts an engineering grade PACE HAWAII-2 array detector, and uses only a single quadrant with 1024 x 1024 pixels. In a normal operation, the detector is cooled down to 70K.
For the array readout, data acquisition system TAC is adopted, which is originally designed for mid-infrared arrays of MAX-38 camera. The TAC system consist of a real-time Linux PC equipped with a RTAI extension, and a digital I/O board PCI-2772c (Interface Co. Ltd.) with a DMA function. The front-end electronics consist of the fan-out board mentioned above and two VME full-size boards, that is a bias/clock board and an amplier/ADC board.
The advantage of this system is the flexibitily of the clock generation, which enables us to read out the array at any speed you want.
Typical readout mode is a correlated double sampling (CDS) of reset - read - read(reset all the frame first before the first readout), with pixel rate of 4usec/pix, which result in the shortest exposure time of 4.2sec. This can be accelerated up to 2usec/pix (or 2.1sec/frame), but the serious readout pattern occurs, and we recommend this mode to use only for bright objects.
There are following optional readout modes;
