QmagiQ LLC, has recently completed building and testing high operability two-color Quantum Well Infrared Photodetector (QWIP) focal plane arrays (FPAs). The 320 x 256 format dual-band FPAs feature 40-micron pixels of spatially registered QWIP detectors based on III-V materials. The vertically stacked detectors in this specific midwave/longwave (MW/LW) design are tuned to absorb in the respective 4-5 and 8-9 micron spectral ranges. The ISC0006 Readout Integrated Circuit (ROIC) developed by FLIR Systems Inc. and used in these FPAs features direct injection (DI) input circuitry for high charge storage with each unit cell containing dual integration capacitors, allowing simultaneous scene sampling and readout for the two distinct wavelength bands. Initial FPAs feature pixel operabilities better than 99%. Focal plane array test results and sample images will be presented.
A silicon mixed-signal integrated circuit is needed to extract and process x-ray induced signals from a coated flat panel thin film transistor array (TFT) in order to generate a digital x-ray image. Indigo Systems Corporation has designed, fabricated, and tested such a readout integrated circuit (ROIC), the ISC9717. This off-the-shelf, high performance, low-noise, 128-channel device is fully programmable with a multistage pipelined architecture and a 9 to 14-bit programmable A/D converter per channel, making it suitable for numerous X-ray medical imaging applications. These include high-resolution radiography in single frame mode and fluoroscopy where high frame rates are required.
The ISC9717 can be used with various flat panel arrays and solid-state detectors materials: Selenium (Se), Cesium Iodide (CsI), Silicon (Si), Amorphous Silicon, Gallium Arsenide (GaAs), and Cadmium Zinc Telluride (CdZnTe). The 80-micron pitch ROIC is designed to interface (wire bonding or flip-chip) along one or two sides of the x-ray panel, where ROICs are abutted vertically, each reading out charge from pixels multiplexed onto 128 horizontal read lines.
The paper will present the design and test results of the ROIC, including the mechanical and electrical interface to a TFT array, system performance requirements, output multiplexing of the digital signals to an off-board processor, and characterization test results from fabricated arrays.
The Brazilian free-tailed bat (Tadarida brasiliensis) forms some of the largest aggregations of mammals known to mankind. However, little is known about population sizes and nightly foraging activities. An advanced infrared (IR) thermal imaging system with a real time imaging and data acquisition system is described for censusing Brazilian free-tailed bats during nightly emergences at selected Texas caves. We developed a statistically-based algorithm suitable for counting emerging bats in columns with relative constant trajectories and velocities. Individual bats are not identified and tracked, but instead column density is calculated at intervals of 1/30th of a second and counts are accumulated based upon column velocity. Preliminary evaluation has shown this method to be far more accurate than those previously used to census large bat populations. This real-time automated censusing system allows us to make accurate and repeatable estimates of the number of bats present independent of colony size, ambient light, or weather conditions, and without causing disturbance to the colony.
Indigo Systems Corporation has recently developed a line of high performance NIR devices and cameras based upon InGaAs detector arrays. The InGaAs detector arrays are fabricated at Indigo Systems Detector Operations facility and include 640x512 and 320x256 staring focal plane arrays which are utilized in three camera configurations ranging from the miniature alpha camera to the Merlin and Phoenix high performance cameras. The InGaAs detector arrays are very high performance devices with operability routinely exceeding 99.9%. In addition to the staring arrays for imaging applications, two varieties of linear arrays are also being produced at Indigo Systems Detector Operations including a 512 element and 1024 element devices. The linear arrays are intended for use in telecommunications for DWDM applications and are provided in industry standard packages for insertion into DWDM systems. All linear arrays require 100% perfect operability and this is routinely achieved.
Indigo Systems Corporation has developed a family of standard readout integrated circuits (ROIC) for use in IR focal plane arrays (FPAs) imaging systems. These standard ROICs are designed to provide a compete set of operating features for camera level FPA control, while also providing high performance capability with any of several detector materials. By creating a uniform electrical interface for FPAs, these standard ROICs simplify the task of FPA integration with imaging electronics and physical packages. This paper begins with a brief description of the features of four Indigo standard ROICs and continues with a description of the features, design, and measured performance of indium antimonide, quantum well IR photo- detectors and indium gallium arsenide imaging system built using the described standard ROICs.
This paper describes a standardized high performance 640 by 512 readout integrated circuit (ROIC) for p-on-n detectors such as InSb, Heterojunction HgCdTe, QWIP, and InGaAs. The array is intended to support a wide range of system through flexibility and advanced modes of operation. The ISC9803 uses a flexible, programmable, multistage pipelined architecture to achieve a state-of-the-art ROIC suitable for applications ranging from hand-held IR viewers to high-speed industrial imaging system. A simplified default mode directly supports single output NTSC or PAL operation. Using the programmable mode, the ISC9803 supports such advanced features as dynamic image transportation, dynamic windowing, multiple high-speed multi tout configurations, and signal 'skimming'. Both default and programmed modes support integrate-while-read and integrate-then-read snapshot operation, and variable gain. This array is part of the Indigo Systems family of standard ROICs that use a common architecture and electrical interface.