Focal plane array imaging system

Focal plane array imaging systems should ideally have at least one detector per resolution cell within the field of view of the system. For example, if a system has a 30° azimuth x30° elevation field of view and the theoretical angular resolution for the system is 0.5°, then the focal plane would consist of at least a 60 x 60 array of detectors. Synthetic... 

The introduction of focal plane array (FPA) systems, initially InGaAs, for near-IR by Marcott and Lewis [4] occurred on 20 June 1994, while the subsequent development for mid-IR, using a mercury cadmium teUuride (MCT) array by Lewis and Levine [5] at Bethesda, Maryland, resulted in very rapid image generation. 

The development of NIR spectral-imaging systems using IR focal-plane array detectors represents a novel technique that may provide new insights into the structure and function of solid dosage forms [46]. 

Reflectance images were acquired at a magnification of 30 x 30 pm per pixel with a MatrixNIR NIR system (Spectral Dimensions Inc., Olney, MD) equipped with an InGaAs focal-plane array detector with 320 x 256 pixels. A wavelength increment of 7 nm was used to collect data over the spectral range 1100-1750 nm. The first data... 

Figure 7.3 Schematic for an imaging infrared microspectrometer system using a focal plane array (FPA) detection system. Note that the upper and lower apertures must be left open or removed to allow light to fall onto the entire area to be imaged.

FT-IR imaging systems commercially available at present use two types of array detectors a one-dimensional (linear) array in which the detection pixels are arranged linearly, or a two-dimensional array in which the detection pixels are laid out in a plane (often referred to as a focal-plane array or FPA). 

The second example classifies different types of almonds by using the information from their surfaces. The NIR image was acquired using a Sapphire Matrix NIR focal plane imaging system (Spectral Dimensions now Malvern Instruments Ltd, Malvern, Worcestershire, UK). The system comprised an NIR sensitive stirring-cooled InSb Focal Plane Array detector, four quartz-halogen lamps, which provided the illumination, and 2" polarization filters. The 81920 pixels (320 x 256 array) of the camera can be directed at fields of view varying from square millimetres to square inches. 

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