Kinch M.A.,DRS Technologies
Journal of Electronic Materials | Year: 2015
For reasons associated with size, weight, power consumption, and cost, the future of infrared systems for all spectral bands is being driven towards megapixel formats operating under diffraction- and background-limited conditions with ever-smaller pixel pitches and ever-higher operating temperatures. The performance requirements of such systems with regard to both optical and detector limitations are examined for the materials technologies and device architectures that are in vogue today. At elevated operating temperatures, available noise equivalent temperature difference values for diffraction-limited operation are found to be strongly dependent on the available pixel pitch, optimizing at values ∼λ/4, where λ is the operating wavelength. The possibility for extending the operation of mid- and long-wavelength focal plane arrays to room temperature with diffraction- and background-limited performance is discussed, together with the potential issues that must be addressed in order to achieve this ultimate goal. © 2015, The Minerals, Metals & Materials Society.
Kinch M.A.,DRS Technologies
Journal of Electronic Materials | Year: 2010
Since its introduction in the early 1970s, HgCdTe has become the general workhorse of the global infrared (IR) industry. Despite a significant lack of investment in the basic science of this materials system since 1990, huge advances have been made in HgCdTe focal-plane array (FPA) technology, resulting in the current availability of a wide variety of large-area FPAs, for all IR spectral bands, both monocolor and multicolor, with the capability for both passive and active imaging. The current status of the many technologies relevant to the continued good health of HgCdTe is discussed herein, with regard to both their present limitations and possible opportunities for improvement. © 2010 TMS.
DRS Technologies | Date: 2013-07-02
An injection port is provided for installation on an enclosure to provide quick access for admitting a fire suppressing agent into the enclosure in the event of a fire inside the enclosure. The injection port includes a housing and an injection port cover. The housing includes a mounting plate for mounting the housing to the enclosure and a pin receptacle. The injection port cover includes a cover plate and a pin release mechanism. The pin release mechanism includes a movable pin that engages with the pin receptacle of the housing to secure the injection port cover to the housing when the injection port is in the closed position.
DRS Technologies | Date: 2014-06-30
An integrated power system suitable for simultaneously powering marine propulsion and service loads. The system includes: (a) at least one generator configured with at least first and second armature windings configured to output respective first and second alternating current power signals of different voltages, the at least two armature windings positioned within the same stator slots so that they magnetically couple; (b) at least first and second rectifier circuits coupled to said generator to convert said first and second alternating current power signals into first and second direct current power signals; (c) a first load to which said first direct current power signal is coupled and a second load to which said second direct current power signal is coupled.
DRS Technologies | Date: 2014-08-26
Embodiments of the present invention are directed to a controller that is configured to limit the rate of change of speed of a motor (e.g., the acceleration or deceleration) regardless of the operating mode of the motor (e.g., speed, torque, or power control mode). The controller can include an acceleration estimator which monitors the output speed of a motor and provides an acceleration-limited speed set point. The output of the acceleration estimator may be limited to a range of acceptable acceleration values that correspond to the required limits of acceleration and deceleration. The acceleration estimator can be configured such that it causes the speed regulator to override the torque and/or power regulators when the acceleration range is exceeded.