Abstract: Tetraisopentyl esters of butanetetracarboxylic acid are useful as plasticizers or as part of a plasticizer composition for polymers, A process for the production thereof, plasticizer compositions containing the tetraisopentyl esters of butanetetracarboxylic acid, and plastics compositions containing the tetraisopentyl esters of butanetetracarboxylic acid are also provided,

Abstract: Tetraisopentyl esters of butanetetracarboxylic acid are useful as plasticizers or as part of a plasticizer composition for polymers. A process for the production thereof, plasticizer compositions containing the tetraisopentyl esters of butanetetracarboxylic acid, and plastics compositions containing the tetraisopentyl esters of butanetetracarboxylic acid are also provided.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: A lidar comprises a first laser source configured to generate a first laser output at a first frequency and a second laser source configured to generate a second laser output at a second frequency, wherein the first frequency is different from the second frequency. A combining coupler combines the first laser output and the second laser output into a combined output. The combined output is carried by an optical fiber to a fiber tip where the combined output is transmitted as a transmit signal toward a target. A reflected portion of the transmit signal reflected back from a point on the target is received. A mixing coupler mixes the received reflected portion of the transmit signal with a second portion of the combined output and outputs a mixed signal. A wavelength filter separates the mixed signal into a first mixed signal corresponding to the first frequency of the first laser source and a second mixed signal corresponding to the second frequency of the second laser source.

Abstract: The use of zinc ketoiminate complexes in the production of polyurethanes is described, wherein the zinc ketoiminate complexes are obtainable by reacting a zinc compound with certain ketimines.

Abstract: The use of zinc ketoiminate complexes in the production of polyurethanes is described, wherein the zinc ketoiminate complexes are obtainable by reacting a zinc compound with certain ketimines.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: According to various implementations of the invention, a system for controlling a controlled device includes a lidar configured to direct at least one beam toward a target; a first controlled device, wherein the at least one beam is directed toward the target via the first controlled device; and a control system configured to control a position of the first controlled device, where the control system includes an open loop controller and a closed loop controller. The open loop controller is configured to receive a desired trajectory command signal, and generate an open loop drive signal based on the desired trajectory command signal. The closed loop controller is configured to receive an actual position signal of the first controlled device, and generate a closed loop drive signal based on the actual position signal and a control signal derived from the command signal, where the control signal accounts for group delays associated with one or more control system components.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.

Abstract: An unmanned aircraft includes a plurality of drive modules arranged in a decentralized manner, wherein each drive module has a plurality of aircraft components. The unmanned aircraft further has a payload sensing system consisting of a sensor system including one or a plurality of sensor units in such a way that the solid angle for capturing measuring data is increased and the flight safety of the aircraft is improved simultaneously. The sensor units are centrally arranged in the form of the sensor system.

Abstract: A control system structure is provided that improves system bandwidth without affecting optimization for other performance criteria (such as, suppressing loop disturbances, or other optimization criteria) and stability of a closed-loop system.

Abstract: A laser radar, or “lidar” system, employs an asymmetric single-ended detector to detect received signals reflected back from targets. The asymmetric single-ended detector benefits from a reduced part count and fewer optical splices while nearly achieving a same gain as a symmetric differential detector.

Abstract: A lidar comprises a first laser source configured to generate a first laser output at a first frequency and a second laser source configured to generate a second laser output at a second frequency, wherein the first frequency is different from the second frequency. A combining coupler combines the first laser output and the second laser output into a combined output. The combined output is carried by an optical fiber to a fiber tip where the combined output is transmitted as a transmit signal toward a target. A reflected portion of the transmit signal reflected back from a point on the target is received. A mixing coupler mixes the received reflected portion of the transmit signal with a second portion of the combined output and outputs a mixed signal. A wavelength filter separates the mixed signal into a first mixed signal corresponding to the first frequency of the first laser source and a second mixed signal corresponding to the second frequency of the second laser source.

Abstract: A laser radar, or “lidar” system, employs an asymmetric single-ended detector to detect received signals reflected back from targets. The asymmetric single-ended detector benefits from a reduced part count and fewer optical splices while nearly achieving a same gain as a symmetric differential detector.

Abstract: Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal.