285 results about "Light speed" patented technology

Ultrashort pulse laser processing bores, welds or cuts objects (work pieces) by converging ultrashort laser pulses by a lens on the objects (work pieces) positioned at the focus and heating small spots or narrow lines on the objects (work pieces). Shortage of a focal depth of the lens prevents the ultrashort pulse laser processing from positioning the object (a work piece) and forming a deep, constant-diameter cylindrical hole. Z-parameter is defined to be Z=2fcΔt/Δi², where Δt is a FWHM pulse width of the ultrashort pulse laser, Δi is a FWHM beam diameter of the ultrashort pulse, f is a focal length of the lens and c is the light velocity in vacuum. Selection of an optical system including a diffraction-type lens which gives the Z-parameter less than 1 (Z<1) prolongs the focal depth. Expansion of the focal depth facilitates the positioning of objects (work pieces) and enables the ultrashort pulse laser apparatus to bore a deep, constant-diameter cylindrical hole.

The invention relates to laser melting rapid forming method in the metal parts precinct and its installation. The method includes that setting CAD geometric model, doing stratification variance and laying powder layer by layer to the CAD geometric mode, adopting laser with high power density and high light speed factor of merit to form focusing facula with the diameter which is from thirty millimeter to fifty millimeter by focusing of beams system, melting the metal or alloy powder layer by layer, piling to a metallurgy unite, and forming to a compact solid mass. The installation is made up of semiconductor pumping YAG laser or fiber laser, focusing of beams system, shaped part jar, and powder jar. The semiconductor pumping YAG laser or fiber laser is light path connected to the focusing of beams system, and focalized and scanned at the shaped part jar. The shaped part jar is connected to the powder jar by powder laying roller. The powder laying roller is connected to the driving motor. And the driving motor is connected to the computer. The advantages of the invention are that the beam mode is good; mechanical features of the processed metal parts is well; the dimensional precision and the surface finish are high; and its range of application is wide.

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.

An optically readable media (10) has an information-encoding layer (16) and at least one color-forming layer (12) that embodies an optical readout-limiting mechanism. In a first embodiment the at least one color-forming layer contains an additive that does not interfere with the optical readability of the media for a duration of a readout period. The additive, upon exposure to a source of optical radiation that is suitable for reversing the color-forming layer from an optical readout inhibiting state to an optical readout enabling state, undergoes a transformation that maintains the color-forming layer in the optical readout inhibiting state. More specifically, exposure to the source causes the color-forming layer to photobleach and the additive to oxidize, where the oxidation of the additive permanently inhibits the optical readability of the media. The additive may be a leuco dye. In one embodiment the color-forming layer is comprised of 3-[2,2-bis(4-diethylaminophenyl)vinyl]-6-dimethylaminophthalide and the additive is comprised of benzoyl leucomethylene blue. In a further embodiment the additive is placed into a protective layer (18) that overlies the color-forming layer.

The invention discloses a data collection synchronous method of an electrical railway distance measurement device, which is characterized in that: synchronous data collection is realized through special optical fibers, a distance measurement device of a traction substation is adopted as a main machine, a distance measurement device of AT transformer station and a sectioning station is adopted as an auxiliary machine, and all distance measurement devices are connected with one another through one optical fiber; the length of an optical fiber channel is estimated through the inputted parameter of a distance between every two AT transformer stations, data transmission delay between the devices of the AT transformer stations or between the devices of the AT transformer station and the sectioning station is further calculated according to the length of the optical fiber and the optical speed, a sampling interruption interval time of the auxiliary machines is instantly adjusted according to the calculated fixed data transmission delay, the desynchronizing influence caused by errors such as clock crystal oscillation can be eliminated, and the sampling interruption between the main machine and the auxiliary machine as well as between the auxiliary machine and the auxiliary machine is maintained relatively synchronous.

The invention discloses a pulse-type laser range finding method, comprising: S1, a controller outputting emission driving signals with time intervals T to drive a laser to emit a laser pulse sequence with (M-1) time intervals T; S2, a return light receiving device receiving reflected pulses, and a time chip recording the flight time Tf of each laser pulse from emission to receiving, and a receiving absolute time Ta, wherein the flight time Tf is much less than the time intervals T; S3, determining whether each received reflected pulse is an effective reflected pulse, storing the flight time Tf and receiving absolute time Ta of the reflected pulse in a controller if the received reflected pulse is effective, and continuing receiving a next reflected pulse if the received reflected pulse is ineffective; and S4, based on the flight time Tf of effective reflected pulses, setting a light velocity to be C, and calculating a distance D to be measured, wherein D=(C*Tf)/2. The pulse-type laser range finding method has the advantages of weak reflection, high accuracy of long distance laser range finding, and strong anti-interference capability.

The invention discloses a method for realizing high-precision distance measurement through measuring a phase difference. First of all, by use of a function relation between a phase shift and a frequency shift, an airborne distance measurement formula led out from a Doppler equation is converted to a method for positioning a fixed object by an airborne single station only on the basis of the difference measurement. Based on this, on one hand, based on a characteristic that an airborne difference distance measurement solution is irrelevant to the motion speed of a detection platform itself, and on the other hand, through comparing with an approximate expression, obtained through derivation based on a difference positioning equation, of a strict distance measurement solution, an airborne difference passive distance measurement method is further developed to a double-station positioning method which is not only restricted to motion states of the platform itself, but also can perform real-time detection on maneuvering objects. Since error measuring equation of the difference distance measurement solution is irrelevant to a huge-magnitude light velocity, compared to a time difference positioning technology, better positioning precision can be obtained through fewer sites by use of difference positioning. A result given by use of the method definitely explores a new research direction for the development of a positioning technology.

The invention provides a method and a device for eliminating background dark noise response of a laser radar. A laser radar transmits a laser pulse signal to a detection target; a receiving lens receives an optical signal reflected by the detection target and transmits it to a photoelectric detector; the optical signal is converted into an electric signal; a back-end processing circuit sets high and low voltage thresholds ThresholdH and ThresholdL, and trigger signals are generated when echo signals exceed thresholds; a trigger signal TrigL generated by a low threshold extracts trigger time information TL through a high precision time measurement module, and a trigger signal TrigH generated by a high threshold is delayed by a delay module; and when the TrigH can be received within a shorttime window TW after the TrigL trigger is received, it is considered to be a valid echo event trigger, and when the TrigH is not received within the time window, it is considered that error response is generated by a noise signal generated by the dark count of a detector; and if it is a noise signal, subsequent processing is not executed, if it is a real echo signal, TL is regarded as a differencebetween the arrival time and the transmission time and as a pulse flight time, and a target distance is solved according to the light speed, thereby reducing the false alarm rate.

An interferometer includes a means for splitting, at a splitting location, an input light beam into a first beam and a second beam; and means for recombining, at a recombination location, the first beam and the second beam. The interferometer is designed such that the first beam will travel a first optical path length (OPL) from the splitting location to the recombination location, and the second beam will travel a second OPL from the splitting location to the recombination location and such that when the input light beam has been modulated at a data rate comprising a time interval, then the difference in optical path lengths between the first OPL and the second OPL is about equal to the time interval multiplied by the speed of light.

The invention discloses an intelligent building inclination detecting and early-warning device and a detecting method. The device comprises a laser emitter, a laser receiver, a horizontal alignment laser ball, a horizontal alignment laser target, a stepping motor, a circuit board, a GSM antenna, a support and a shell. The distance between the device and a building can be measured through the time difference and light velocity of emitting and receiving of lasers, and the included angle between the building and the horizontal plane can be obtained according to the triangle cosine theorem and the sine theorem. The horizontal alignment laser ball emits horizontal lasers all the time, the horizontal alignment laser target rotates along with the shell, and the horizontal alignment laser ball and the horizontal alignment laser target are used for aligning the shell to be horizontal. The stepping motor is used for precisely controlling the rotation angle of the shell. When the measured included angle between the building and the horizontal plane is close to a danger value, early-warning signals are sent to a background through the GSM antenna. No auxiliary devices need to be arranged on the building, data is directly transmitted to the background through a GSM network, and a great promotion effect is achieved for the whole building industry and work of the supervision department.

Rubber crawler traveling equipment (1) capable of reducing the weight and cost of a rubber crawler, and commonizing a light-speed traveling to a traveling according to a tire specification and a traveling to a traveling according to a crawler specification, wherein core members (5) formed of plastic material are embedded in a rubber crawler (2) instead of metallic core members embedded in a conventional rubber crawler and the rubber crawler (2) is suspendedly installed on tires (3, 4), whereby the rubber crawler (2) can be easily attached and detached and the extension thereof can also be adjusted by regulating the internal pressure of the hollow tire (3).

A Cerenkov radiation source of surface plasma waves belongs to the technical field of electromagnetic wave radiation sources, and comprises an electron gun, a medium material layer and a metallic film layer deposited on the surface of the medium material layer. Electron beams emitted by the electron gun skim over the surface of the metallic film layer to excite surface plasma waves on the surface of the metallic film layer, and the surface plasma waves penetrate the metallic film layer to reach the medium material layer; when the ratio Beta between the movement speed of the electron beams emitted by the electron gun and the light velocity in vacuum, and the refractive index n of the medium material layer satisfy the Cerenkov radiation condition that n Beta is larger than 1, the surface plasma waves are converted into Cerenkov radiation in the medium material layer; the radiation frequency is determined by the frequency of the surface plasma waves; and through changing the energy of moving electrons, the frequency of the excited surface plasma waves can be changed, so that the frequency of the electromagnetic radiation source can be tuned. The Cerenkov radiation source has the characteristics of miniaturization, narrow bandwidth, tunability, low voltage and easiness in integration.

The invention discloses a hand-held laser processing gun system, comprising a fiber laser (10), a control system (20), a body of a laser gun (30), a focusing system (50), a laser nozzle (70), a focus-controlling and rotating wheel for the processing gun (60), and an optical fiber. The invention is characterized in that: the fiber laser (10) is connected with the control system (20); the laser is also connected with a laser head integrated in the body of the laser gun (30) through the optical fiber; the focus-controlling and rotating wheel (60) is fixed at the bottom of the body for the laser gun; laser beam from the laser (10) is output by the laser head, and focuses and works on a workpiece through the focusing system (50) and the laser nozzle (70). The invention has the advantages of convenience in portability due to compact size, light weight and good light speed quality of the fiber laser and the characteristics of hand-held laser processing gun, and avoidance of inconvenient manufacturing due to the position, cost and other reasons in the past.

A semiconductor ring laser gyroscope includes: a semiconductor laser for emitting two lights from both end surfaces thereof; an optical fiber ring through which the two light propagate in the respective opposite directions, which, in association with the semiconductor laser, constitutes a laser resonator, and which includes a sensor coil made of an optical fiber wound in a multilayer manner; and an optical detection unit for detecting a rotational angular velocity based on beat frequencies of the two lights, wherein an expression: 2ΔF_{beat<sub2>—</sub2>max}<F_rlg≦10ΔF_{beat<sub2>—</sub2>min} is satisfied in which F_rlg=C/nL, where ΔF_{beat<sub2>—</sub2>max} and ΔF_{beat<sub2>—</sub2>min} are beat frequencies corresponding respectively to the upper and lower limits of an angular velocity measuring range, F_rlg is a ring resonance frequency, C is a light speed, n is a refractive index of the optical fiber, and L is an overall length of the optical fiber.

The embodiment of the invention provides a positioning method and device, electronic equipment and a readable storage medium. The method is applied to the technical field of wireless positioning. Themethod comprises the following steps of: respectively calculating a difference value between the time when the signal transmitted by each measurement base station reaches the mobile terminal and the time when the signal transmitted by the reference base station reaches the mobile terminal; obtaining each TDOA value; according to the three-dimensional position coordinates of each measurement base station and the reference base station, judging whether the heights between the measurement base stations and between the measurement base stations and the reference base station are the same or not; if yes, measuring the height value of the mobile terminal through air pressure; and taking the height value as a position coordinate of one dimension in the three-dimensional position coordinates of the mobile terminal, and solving the position coordinates of other two dimensions of the mobile terminal through a preset 2.5-dimensional Chan algorithm according to the three-dimensional position coordinates of each measurement base station and the reference base station, each TDOA value, the light speed and the position coordinate of one dimension. The positioning range can be enlarged, and the positioning precision is improved.

Quantum-size electronic devices comprise electrodes and at least one cluster separated from the said electrodes by a tunnelly transparent gap. The characteristic dimensions for elements of quantum-size devices are determined by the formula in the range 1x4 r0, wherein r0 = h/(me alpha <2>c), wherein h is the Planck's constant, me is the electron mass, alpha = 1/137,036 is the fine structure constant, c is the light speed. The cluster may be made of a semiconductor material, conductor, superconductor, high-molecular substance or a sheath with a tunnelly transparent dielectric. The matured theory provides possibilities for designing logical devices operating in the mode of transfer and/or storing of several electrons at normal conditions and high temperatures. The operating regimes of the devices are determined. The invention provides basic condition for constructing of high-temperature superconducting elements and devices based thereon.

The invention discloses an ROADM node, an optical wavelength correction frequency shifter and an implementation method. The wavelength correction frequency shifter comprises a sawtooth wave electric signal generator and an electro-optic phase modulator, wherein the sawtooth wave electric signal generator produces continuous sawtooth wave electric signals with the repetition frequency of F, which serve as driving electric signals, and the electro-optic phase modulator loads driving electric signals to conduct frequency shift delta fi on the central wavelength of input optical signals, so that the central wavelength lambada i of input optical signals is close to the expected central wavelength lambada i-1, and c represents the velocity of light. According to the ROADM node, the optical wavelength correction frequency shifter and the implementation method, the central wavelength of input optical signals is close to the designed central wavelength of an ROADM through correction of the central wavelength of input optical signals, so that the effective bandwidth loss of the ROADM, which is caused by the multistage filtering cascaded filtering function, is reduced, an all-optical method is used for correcting the wavelength of optical signals, and the implementation method is applicable to ROADM nodes of any wavelength multiplexing wavelength division multiplex (WDM) optical networks of various transmission rates.

This invention relates to a making method for a kind of dust-free cloth, which has the following steps: spinning, weaving, dyeing and reorganizing, shaping, cutting, cleaning and casing, all of them are operated in the two layers dust-free cleaning room, wherein the main flow process of the dyeing and reorganizing includes the stock opening fine processing, cationic and anion processing, corpuscular processing and cutting, the cutting flow processing mainly includes thunder lunching light velocity trimming. Wherein using the agent from the natural plant can lower the corpuscular quantum and the cationic and anion quantum of the dust-free cloth, and then using the thunder lunching light velocity to eliminate the dust developing quantum in the cutting and edge banding processing efficiently, which can improve the neatness quality of the dust-free fabric and lower the water pollution that results from the dust-free cloth making.

A laser range finder comprises a laser transmitter for transmitting a laser beam, a microcomputer electric reflector array, a microcomputer electro-optical receiving array, and a processing unit. The microcomputer electric reflector array is used for reflecting the laser beam to a plurality of positions on an object to be detected. The microcomputer electro-optical receiving array is used for receiving the laser beam reflected by the object to be detected. The processing unit is used to record transmitting time t1 of the laser beam by the laser transmitter and receiving time t2 of the laser beam reflected by the plurality of positions on the object to be detected through the microcomputer electro-optical receiving array. A plurality of distances to be detected are obtained through the formula t2-t1=2L/c, wherein c is light speed and L is the distance to be detected.

An object of the present invention is to provide a compact laser irradiation device and a laser irradiation method using an optical system including an electric mirror and an fθ lens, which can suppress interference caused by secondary beams on the back side of a substrate Therefore, uniform laser annealing can be performed on the irradiated object, and the throughput can be improved. In the present invention, when it is assumed that the thickness of the substrate on which the object to be irradiated is formed is d, the refractive index is n, and the speed of light in vacuum is defined as c, the pulse width t of the laser beam satisfies the inequality ct<2nd. In the above structure, even if an optical system including an electric mirror and an fθ lens is used, the influence of interference due to the secondary beams on the backside of the substrate can be reduced, so that uniform laser annealing can be performed on the object to be irradiated.

The invention relates to the technical field of ellipsometry methods and instrument equipment, in particular to a spectroscopic ellipsometry device and method based on elasto-optical modulation. Achievement of the spectroscopic ellipsometry device and method is based on 45-degree dual-drive symmetrical structure elasto-optical polarization modulation and a FPGA elasto-optical drive control and data signal treatment technology. After a compound color light source outputs quasi-monochromatic light through a monochromator, through light speed shaping and collimation, the light exits from an analyzer and is detected and received by a photomultiplier after passing through a polarizer, a to-be-measured sample and an elasto-optical modulator. In an FPGA unit, cophase component and orthogonal component demodulation of a modulated optical signal frequency doubling item is achieved, and the introduction into a control computer is achieved; the spectroscopic ellipsometry device does not need mechanical adjustment, the measuring speed is high, the precision and the sensibility are higher, automatic control is convenient, and a new theory and a new method can be provided for relative fields ofthe spectroscopic ellipsometry technology.