摘要:
A method of using a light detection system for increasing the accuracy of a precision airdrop is described. Radiation is transmitted to target areas between an airborne vehicle and a dropzone target. Scattered radiation is received from the target areas. Respective wind characteristics are determined from the scattered radiation and a wind velocity map is generated, based on the respective wind characteristics, between the airborne vehicle, and at least the dropzone target. An aerial release point for the precision airdrop is computed based on the generated wind velocity map and a location of the dropzone target.
摘要:
Systems and methods for laser based measurement of air parameters are disclosed. An example system includes a source of radiation, an amplification system with one or more power amplification stages, a transceiver, and an optical mixer. The source produces a plurality of beams, and the amplification system is configured to amplify the beams. The transceiver is configured to transmit the modulated beam to, and receive a scattered beam from a target region. The optical mixer is configured to determine a difference between the scattered beam and a reference beam, which is used to determine a Doppler shift therefrom. In certain embodiments, the amplification system includes a fiber preamplifier and one or more fiber power amplifiers stages.
摘要:
This invention provides a high-efficiency light-emitting device and the manufacturing method thereof. The high-efficiency light-emitting device includes a substrate; a reflective layer; a bonding layer; a first semiconductor layer; an active layer; and a second semiconductor layer formed on the active layer. The second semiconductor layer includes a first surface having a first lower region and a first higher region.
摘要:
A method of wear leveling for a non-volatile memory is disclosed. A non-volatile memory is divided into windows and gaps, with each gap between two adjacent windows. The windows comprise physical blocks mapped to logical addresses, and the gaps comprise physical blocks not mapped to logical addresses. The windows are shifted through the non-volatile memory in which the mapping to the physical blocks in the window to be shifted is changed to the physical blocks in the gap.
摘要:
Systems and methods are disclosed for measuring a distance, a velocity, etc., of a target using coherent laser radiation. In one example, a method is provided comprising measuring a time required for a light pulse to travel to and from a target, the light pulse reflecting from the target, and determining the distance to the target based on the measuring. The method also comprises measuring a Doppler shift of the reflected light pulse using an optical detection technique and determining the velocity of the target from the Doppler shift. In a further example, a system is disclosed comprising a transceiver, a coherent source, an optical system and a detector configured to measure the distance to the target based on a measured time for a light pulse to travel to and from the target. The system is also configured to determine the velocity of the target from a measured Doppler shift.
摘要:
An AC-LED protection circuit comprises an AC-LED with a first terminal and a second terminal, and a circuit protection unit electrically connects with the first and second terminals of the AC-LED. When a voltage between two terminals of the circuit protection unit exceeds a voltage threshold, the circuit protection unit substantially forms a short circuit. Also, when a current through the circuit protection units exceeds a current threshold, the circuit protection unit forms a substantial open circuit.
摘要:
An LED lamp includes an illumination apparatus and a heat-dissipating waterproof cover. The illumination apparatus includes LED modules; and the heat-dissipating waterproof cover is configured to cover the LED modules. The heat-dissipating waterproof cover includes a plurality of drain members, and a gap is formed between every two drain members so as to increase the air convection, thereby increasing heat dissipation efficiency of the LED modules. Every two adjacent drain members are partially overlapping in vertical to prevent the intrusion of water.
摘要:
An LED lighting module comprises an array luminous element and a bar-like light guiding structure. The array luminous element comprises a plurality of illuminants of top-emitting LEDs arranged in an array form. The bar-like light guiding structure surrounds two laterals of the array luminous element. The bar-like light guiding structure comprises a first curved surface and a second curved surface. The first curved surface and the second curved surface respectively descend toward the middle of the array luminous element from the two sides of the array luminous element, and meet above the middle of the array luminous element. The first curved surface and the second curved surface connect with each other at the plane with a certain angle and in tangency where the positive optical axis exists. The positive optical axis is the direction perpendicular to the plane on which the LEDs are mounted.
摘要:
A memory card connector includes an insulative housing having a rear terminal-mounting section and at least one side wall section extending forwardly from one end of the rear section defining a card-receiving space therebetween. A first conductive terminal is mounted on the housing and has a first contact portion with a first protrusion thereon. A second conductive terminal is mounted on the housing and has a second contact portion with a second protrusion thereon. The contact portions of the terminals are normally spaced from each other but are juxtaposed so that the contact portions and the protrusions are mutually engaged in response to a memory card inserted into the card-receiving space. The protrusions are offset from each other, whereby the first protrusion of the first terminal engages the second contact portion of the second terminal, and the second protrusion of the second terminal engages the first contact portion of the first terminal.
摘要:
A new optical sensing device containing fiber Bragg gratings, a scanning bandpass filter, an interferometer and multiple photodetectors is disclosed. The present invention also describes a new system and method for fibre Bragg grating (FBG) sensor interrogation and multiplexing. The new system combines a scanning Fabry-Perot (SFP) bandpass filter used to wavelength-multiplex multiple gratings in a single fiber, and an unbalanced Mach-Zehnder fibre interferometer made with a 3×3 coupler to detect strain-induced wavelength shifts. A passive technique for interferometer drift compensation using non-sensing FBGs is included in the system. A complete prototype system interrogates four gratings in a single fiber at a Nyquist sampling rate up to 10 kHz, with a noise floor measured near 4 n&egr; Hz−1/2 above 0.1 Hz. The inclusion of the interferometer drift compensation technique is shown to make quasi-static measurements feasible.