Of special interest is the wavelength of nm because it is relatively eyesafe, has a good atmospheric transmission characteristics and availability of high quality laser sources. Therefore laser gated imaging LGI provides an excellent 3-D imaging capability when a focal plane array is used.
Avalanche Photodiodes in High-Speed Receiver Systems
Selex-Galileo is a leading manufacturer in LGI systems using an array of highly sensitive nm photodiodes and provides a clear exploitation path for detectors developed in this project. To overcome the noise floor of the system, a gain mechanism is required to amplify photocurrent generated by returning photons.
Hence our high gain InAs APDs with minimal cooling and operating with low reverse bias will be ideally suited for cost effective laser gated imaging systems. Thales Optronics has a wide range of surveillance and thermal imaging products. InAs APDs can provide low cost high performance detectors for applications such as low-light imaging and spectral imaging.
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Hence they can be complementary to Thales' existing range of imaging products. Although NbN nano-wire superconductors are used in some high-performance QKD demonstrations, such detectors require expensive and bulky cooling system to achieve the operating temperature of a few Kelvin. Publications The following are buttons which change the sort order, pressing the active button will toggle the sort order Author Name descending press to sort ascending.
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Butera S Picosecond laser ranging at wavelengths up to 2. Gomes R InAs avalanche photodiodes for X-ray detection. Ker P Low noise high responsivity InAs electron avalanche photodiodes for infrared sensing in physica status solidi c. Ker P High speed low noise InAs electron avalanche photodiodes for telecommunication and infrared sensing applications. Description We have developed a new detector technology using InAs semiconductor. The detector can detect very weak infrared signal since it can provide internal amplification without introducing noise.
We have shown that InAs can provide high internal gain without incurring high amplification noise. Detectors made from InAs can also provide high amplification at high response speed no bandwidth limitation due to the amplification process.
We are now able to detect low light levels down to photons. Exploitation Route The Technology Readiness Level needs to be increased to improve the reliability so that it can be manufactured for full exploitation. InAs detectors have also be evaluated for radiation thermometry with results generated some interest from LAND Ametek. Description The results are subject of invited talks in a number international conferences. Collaborator Contribution Selex has provide advise and guidance in development of array detectors. The authors provide an accessible, well-organized overview of optoelectronic devices and properties that emphasizes basic principles.
It is targeted together to form the knowledge pathway to obtain an advanced polymeric research in polymer thin film. Understanding the design of nanowires described here, requires a multidisciplinary background. The goal of this book is to elaborate the VLSI design techniques at multiple levels: at device level, circuit level, system level, and architectural level.
Swart - InTech , The solid-state circuit technology continuously evolves via breakthroughs and improvements every year. This book is devoted to review and present novel approaches for some of the main issues involved in this exciting and vigorous technology. Not content with just singing and acting, in the following pages, she will guide you in the fundamentals of the vital semiconductor laser components.
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This includes the ability to schedule commands. The project is transitioning into a state of operations where experiments with PFISR will be performed often, and the data download priorities will be for any data collected during space weather activity. The main activities within nominal spacecraft operations include scheduling and processing experiments; scheduling other events such as radar receiver noise floor characterization, logging GPS data, and collecting high frequency telemetry data; and down linking data.
The project normally uploads a schedule to RAX-2 once per day which includes time-tagged commands for the next 24 hours. When no experiment or related activities are performed, data is downloaded to the University of Michigan and SRI ground stations, as well as the global amateur radio community Ref. The GPS receiver is operating successfully, locking to the GPS constellation and providing excellent signal strengths. GPS is necessary to provide accurate time and position to the R2 satellite necessary to accomplish our science goals. The RTI plot is the result of on-board processing of the raw radar measurements.
This plot shows the intensity of the radar measurements along with time between transmission and receipt of the signals versus time into the experiment. This was expected given the calm space weather conditions at the time of the experiment. Figure 10 : Data plot generated during processing of this first experiment image credit: UM. Legend to Figure 10 : The range delay from transmission to reception is plotted as a function of time for a second experiment. The data looks clean and the radar main beam is clearly visible.
Sensor complement: RAX-2 payload. The primary mission goal is to assess the generation and distribution of natural ionospheric irregularities—a space weather phenomenon that can severely degrade the performance of communication and navigation assets. Secondary goals include training the next generation of space engineers and monitoring amateur radio frequency bands.
Legend to Figure 11 : The radar pulses are reflected off the magnetically aligned plasma disturbances. The reflections scatter in cones and are received by the RAX satellite. The RAX measurement method is utilizing the bistatic radar configuration. Radar scatters from the irregularities and is measured by the orbiting radar receiver. The RAX payload receiver, developed at SRI, operates in a snapshot acquisition mode collecting raw samples at 1 MHz for s over the experimental zone. Following each experiment, the raw data is post-processed for range-time-intensity and Doppler spectrum.
The snapshot raw data acquisition enables flexibility in forming different radar pulse shapes and patterns. In addition, the PFISR electronic beam steering capability can be utilized for simultaneous multiple beam position experiments. The satellite can perform experiments per day. Figure shows the 1-minute satellite tracks that pass through the scattering zone. Springmann, James W. Cutler, John C. Springmann, Alexander J. Sloboda, Andrew T. Klesh, Matthew W. Bennett, James W. Bahcivan, J.
Cutler, J. Springmann, R. Doe, M.