Sensor Architecture

The CRISP imagers consists of two imaging subsystems. A two-dimensional optical imager collects images up to 1024 pixels square. An infrared spectrometer/imager also collects two-dimensional images up to 256 pixels square; one dimension is spatial and the other is spectral. The following figure shows a block diagram of the optical path, the major subsystems, and the computer. The computer consists of two processors. The Tracking Processor Unit (TPU) controls a scan mirror. The TPU's software keeps a target within the field of view. A second processor, the Data Processing Unit (DPU) controls everything else. The DPU controls the one-time deployable cover, the filter wheel in the optical image path, the cooler and calibration lamps of IR spectrometer, and orchestrates image collection and transmission to the spacecraft computer.

Figure 1. Sensor Block Diagram

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