287 results about "Light speed" patented technology

The time difference of arrival for a signal received at two or more receiving sites as transmitted from a wireless communications device, is determined by a frequency domain technique. The constituent frequencies of the signals received at the two or more receiving sites are determined, including the phase, or a value representative of the phase, of each frequency component. The phase values for the same frequency are subtracted to yield a phase difference values as a function of frequency. The slope of the function represents the time difference of arrival for the wireless communications device signal as received at the two receiving sites. To determine the mobile location based on the determined time difference of arrival values, a seed or initial location is first assumed for the wireless communications device and the distance difference of arrival (the time difference of arrival multiplied by the speed of light) is calculated. The calculated time difference of arrival is then used to adjust the distance difference of arrival by continuously iterating the position of the wireless communications device until the calculated distance of arrival and the calculated time difference of arrival (as multiplied by the speed of light) are within a predetermined margin.

A method for controlling a light source in a night vision system is provided. The method first computes a pulse width Tp=2(d-d1) / c, where c is the light speed, according to parameters of a desired observing distance d and a shortest distance d1 of the back-scattering light that enters the light sensor, such as a low-light-level camera. According to the definition of duty cycle D, it is determined by D=(1-d1 / d) / (2-d1 / d). According to the parameters of the desired observing distance and the pulse width, control signals are generated by a pulse signal controller to control a pulsed active-light illuminator with proper emitting period and a gated light sensor with proper gated-on period.

High-speed interconnect systems for connecting two or more electrical elements are provided. Interconnect system has the means, which could reduce the microwave loss induced due to the dielectrics. Reducing the effective loss tangent of the dielectrics reduces the microwave loss. With optimize design of the interconnects, the speed of the electrical signal can be made to closer to the speed of the light. The interconnect systems consists of the electrical signal line, inhomogeneous dielectric systems and the ground line, wherein inhomogeneous dielectric system consisting of the opened-trenches into the dielectric substrate or comb-shaped dielectrics to reduce the microwave loss. Alternatively dielectric structure can have the structure based on the fully electronic or electromagnetic crystal or quasi crystal with the line defect. Alternatively, dielectric structure can be made to comb-shaped structure with teethes having thickness and space making the air pocket to reduce the microwave loss. The interconnect system, can be made in rigid or flex board for off-chip interconnects for IC packages, connectors and cables, where conventional manufacturing technology can be used and yet to increase the bandwidth of the interconnects.

The invention discloses an optical lens. The optical lens comprises a lens body. A light-incidence curved surface with the center sunk upwards for incidence of light is formed on the bottom of the lens body. A first light-exit curved surface with the center sunk downwards is formed on the top of the lens body. A second light-exit curved surface is formed on the side portion of the lens body. After incidence of the light through the lens body is finished, an included angle between the first light-exit curved surface and the axis of the lens body is 42 degrees as a critical angle, light beams between a central light beam and 42 degrees are refracted through the first light-exit curved surface, and light beams between 42 degrees and 85 degrees are refracted through the second light-exit curved surface after being totally refracted through the first light-exit curved surface. According to the optical lens, a catadioptric way is adopted for beam angle diffusion, and brightness uniformity on a receiving surface is improved.

The invention relates to a fixed-frequency slow wave adjustable device which comprises a dielectric substrate and four graphene strips arranged on the dielectric substrate. Two graphene strips are tightly arrayed vertically and are used as electromagnetism-like induced transparency illuminated state units. The other two graphene strips are arrayed by a certain distance up and down horizontally and are used as electromagnetism-like induced transparency dark state units. Compared with the prior art, the structure is miniaturized, in addition, the optical response of graphene at a terahertz wave band is very strong so that in a transmission direction, one structure layer can achieve six-magnitude-order light speed lowering, the Fermi level of the graphene is very sensitive to external voltage, accordingly, the optical response of the graphene can be adjusted by adjusting the external voltage of the device, and slow wave adjustable performance is achieved.

The invention discloses a device and a method for measuring radial deformation of a tri-axial sample, wherein the device is characterized in that a fixed bracket for a radial deformation measurement device comprises a locating bracket with the same central axis with a tri-axial pressure chamber; the locating bracket is tightly close to the tri-axial pressure chamber; the fixed bracket has a sliding block freely sliding without clearance along the single direction; the sliding block is linked with a displacement sensor and a laser ranger; vertical axes of the sliding block, the displacement sensor and the laser ranger are parallel to the axis of the bracket; non-contact and multi-directional measurement of a sample therein can be carried out outside the tri-axial pressure chamber; the device measures the surface distance of the sample by adopting the laser ranger; the sample is not interfered; the device is capable of measuring the sample in all directions outside the tri-axial pressure chamber; a radial deformation value of the diameter of the sample can be calculated through measured data by utilizing geometric knowledge; the error can be reduced through a multi-point measurement averaging method; and the practical deformation of the sample can be obtained according to light speed conversion.

The invention discloses a laser compensation method for high-frequency linear phase detection of plane wave of a compact range. The laser compensation method comprises the following steps: building a three-dimensional rectangular coordinate system in a dark chamber of a compact range to be detected; determining an initial position of a scanning frame according to a relation between position of a feed source, position of a reflective surface and position of a test area; adjusting a vertical attitude angle and a horizontal attitude angle of the scanning frame and enabling phase detection trend to meet the requirement on the performance of the plane wave; arranging a laser target on a probe antenna of the scanning frame, arranging a laser tracking instrument between the scanning frame and the reflective surface, capturing the position of the laser target in real time by the laser tracking instrument to obtain position information and position deviation delta x of the scanning frame; obtaining a phase deviation result of the plane wave according to a relation between light speed, working frequency and phase, and compensating the deviation result into a phase detection result in real time. The laser compensation method can be used for meeting the requirements on phase detection of the plane wave of the compact range at the high frequency and improving the phase detection accuracy of the plane wave of the compact range.

The invention discloses a method for regulating river water by utilizing sea power, belongs to the field of newly-developed water conservancy and hydropower, and particularly relates to a hydraulic system for collecting, allocating, transferring, regulating and storing river water independently flowing into a sea mainly by utilizing sea wave kinetic energy. The system simultaneously allocates tail water for generating large and small hydropower by utilizing electric power and allocates well water of group wells in a flood retarding basin by utilizing off-peak electricity of a power grid, so that the newly-developed macroscopic hydraulic transfer system with multiple water sources and multiple water supply areas is formed. When the system operates, water is transferred to a sea basin and a transformer kiosk in any long distance and in any height at a light speed and accumulated, and the system executes the principle of first electricity generation and later water utilization. The transformer kiosk can switch three kinds of different water pressure, and farm irrigation is not limited by time, a space, a region and flow. While the system transfers fresh water in a large scale manner, the system regualtes and magnifies electric power; and the system shows disaster prevention and reduction functions in real time for drought and flood fields, provides powerful water pressure and flow for forest fire prevention and urban fire control, and can be highly combined with conventional large water conservancy, large hydropower and power grid.

It is a switching method for Hierarchical Cellular Mobile Communication System, including: (1) detecting the initial lead of two times of time in each preset time period and compute the time interval between the initial lead of adjacent two time; (2) estimating the radial velocity of the users vr, TTRUE_ADV_2 is the initial lead of the back time detected in the process (1), the TTRUE_ADV_1 is the initial lead of the front time detected in the process (1), c for the speed of light. DeltT is the time interval between the initial leads of two time ; (3) The switching control unit receives switching request for crossing the region launched by the user terminals, the current user radial velocity will be compared to the preset radial moving rate to determine the target layer and complete the switch to some small target region from the user terminal. Based on the timing initial lead, the invention calculates the user radial velocity, so it can consider the direction of terminal moving. The estimating value of the user radial velocity is more accurate and reliable.