53results about How to "Transmission far" patented technology

The invention discloses a device and a method for shaping a Gaussian beam to a flat-topped beam. The device mainly comprises four parts, which are a variable focus beam expanding mirror group, an aspherical mirror group, an inverted fixed focus beam expanding mirror group and an upright fixed focus beam expanding mirror group sequentially. At the front end, the variable focus beam expanding mirror group is adopted for firstly performing beam expanding matching on the input Gaussian beam with arbitrary waist radius and the further inputting into the aspherical mirror group, thereby getting the flat-topped beam which is only applicable to near-field propagation. In order to get the flat-topped beam which has better beam quality and can be applicable to far-field propagation, the inverted fixed focus beam expanding mirror group is further used for performing beam expanding, beam reducing is further performed after far-field propagation for a certain distance, and then the flat-topped beam with good uniformity in light intensity distribution is obtained at the output end of a system. The device is very high in flexibility and good in controllability, and can perform the beam expanding on the Gaussian beam with the arbitrary waist radius, and simultaneously overcome the problem that the beam quality of the flat-topped beam which directly goes out of the aspherical mirror group becomes poor.

The invention relates to an OAM generator based on a parabolic reflector and a circular-ring-shaped array feed source. The OAM generator shown in the picture (a) is composed of the circular-ring-shaped array feed source, the rotary parabolic reflector and a supporting mechanism. A structure of the circular-ring-shaped feed source is shown in the picture (b) and used for generating an original OAM radio frequency wave beam, N array elements distributed at equal intervals along the circumference are utilized, the stimulation amplitudes of the array elements are equal, and phases are shown in the mode shown in the specifications, wherein n represents the serial number of the array elements, l represents an OAM mode, a spiral phase item in the shape shown in the specifications can be formed in an array factor of the feed source, and an OAM radio frequency wave beam with the pattern number being l can be generated. When the OAM mode of the generator during working needs to be adjusted, only the phase relation among various array element currents needs to be reset. The rotating parabolic reflector is used for improving the quality of the OAM radio frequency wave beam and can narrow the OAM radio frequency wave beam, directionality and radiation gains can be improved, and the transmission distance of an OAM radio frequency carrier is increased. The OAM generator based on the parabolic reflector and the circular-ring-shaped array feed source can be applied to a wireless communication system, and compared with the existing wireless technology, the system capacity and the spectrum effectiveness can be greatly improved.

The present invention discloses a data communicator, which has characters in that: said electrical power circuit links with a center processor, a RS232 interface chip, a RS485 interface chip, a memorizer linkage respectively. The center processor links with a PS482 interface chip, a RS485 interface chip, a memorizer linkage respectively. The data communicator has advantages and active effects as follows compared with a prior linkage method: 1. Alarm in time. The communicator reads fiber fire detecting data ceaselessly, and the data detected fire alarm is transmitted to the fire alarm host in time. 2. The communicator can read all fiber fire detector data, and saves input modules and spaces. 3. The communicator can substitute all input modules and relays, and saves system cost. 4. The data communication method among the communicator, the fiber fire detector and the fire alarm host can transmit long distance, so the equipment installation is freely.

The invention discloses an explosion-proof sound alarm which comprises a base, an A / B pouring sealant, a control circuit board, a horn, an end cover and a plurality of explosion-proof sheets, wherein the base and the end cover are fixedly connected with each other to jointly form an inside tubular cavity; the A / B pouring sealant, the control circuit board, the horn and the plurality of explosion-proof sheets are arranged in sequence from upper end to bottom end; the opening end of the horn is arranged towards the explosion-proof sheets, and the other end of the horn is connected with the control circuit board. The explosion-proof audible alarm has the benefits that compared with an intrinsically-safe sound alarm, the higher power can be outputted, the sound is larger, and the transmission to a farther distance can be performed; compared with a large-scale explosion-proof sound alarm, the output power is reduced, and the size can be reduced to a very large extent; meanwhile, due to the adoption of a directional transmission way, the sound of the explosion-proof sound alarm can also be transmitted over a long distance, the transmission range is only limited, and the alarm transmission to a farther distance can also be achieved as long as a transmission port of the sound alarm faces to the site environment frequently patrolled.

The application provides a method and a device for measuring the length of a conductor cable. The method for measuring the length of the conductor cable of the present application includes: transmitting an initiation frame signal to the conductor cable to be measured, the initiation frame signal including a first timing point, recording the first moment of transmitting the first timing point; receiving through the conductor cable The response frame signal transmitted by the response device, the response frame signal includes the second timing point, and the second moment of receiving the second timing point is recorded; the time feedback frame signal transmitted by the response device is received, and the time feedback frame signal includes the response device receiving the first timing point The third moment and the fourth moment when the response device transmits the second timing point; the length of the conductor cable is obtained by measuring the first moment, the second moment, the third moment and the fourth moment. The application supports on-network measurement and total length measurement of multi-segment lines, and reduces the harm to equipment connected on the line.

The invention relates to an ion generating device, which belongs to the technical field of air conditioning. The ion generating device comprises an insulating shell and an electrode arranged in the insulating shell. When in use, the electrode is electrically connected with the high-voltage output end of the high-voltage generator; the top of the insulating shell is open, and the electrode is arranged in an insulating The bottom of the casing, the insulating casing is filled with an inert insulating material with micropores, and the diameters of the micropores are basically the same. The ion generating device does not generate ozone and static electricity and can directly generate negative / positive ions with high activity and small particle size.

The invention provides an LED display screen control system. A scanning card (40) comprises a data input / output circuit (43) and an image display control chip (20) which are connected with each other, wherein the image display control chip (20) is preferably an ASIC chip, is used for receiving parameter data and image data through the data input / output circuit (43), carrying out capture, correction, rearrangement and gray level extraction on the received image data according to the parameter data, so that drive signal groups and display data groups are generated and converted into serial differential signal groups which are output to an LED lamp panel module (50); the LED lamp panel module (50) comprises a serial-to-parallel chip group (51) and a drive chip group (53) which are connected, and the serial-to-parallel chip group (51) is used for receiving the serial differential signal groups and carrying out series / parallel conversion so that parallel TTL format drive signal groups and display data groups are generated and sent to the drive chip group (53) for image display drive. According to the LED display screen control system, the function of the scanning card is made chip-based to the greatest extent, and therefore, the purposes of reducing the size of the scanning card and the improving the display effect of an LED display screen body are achieved.

The invention relates to a phase-sensitive optical time-domain reflectometer based on a Golay complementary sequence. The reflectometer comprises an input light generating unit (1), a polarization-maintaining beam splitter (2), a coding sequence modulating unit (3), and a circulator (4), optical fiber to be tested (5), homodyne frequency shifter (6), polarization control unit (7), detection unit (8) and signal demodulation unit (9); also discloses the realization based on Golay complementary sequence simultaneously Phase Sensitive Optical Time Domain Reflectometer Method. The detection unit of the present invention uses an I / Q demodulation system, which can effectively restore all the light field information, especially the absolute phase information, of the real backward Rayleigh scattered light in real time with a refined structure; its local oscillator light gain makes it possible to demodulate the fiber tail The extremely weak signal at the end becomes possible, so this system helps to extend the sensing distance of the system.

The invention discloses a deployable surface device with a fixed truss structure, which mainly aims to solve the problems of high areal density, complicated structure, low deployable reliability and the like in the prior art. The device comprises a plurality of folded rings and connection joints, wherein every two folded rings (2) are connected by one ring connection joint (1) so as to form a circular foldable and deployable ring structure; each folded ring adopts a rectangular or regular triangle hollow straight bar single-rowed truss structure; driven or locked by the ring connection joints, the folded rings are unfolded into an approximately curve working state from a vertically folded state; staggered flexible pulling ropes are arranged on the folded rings; and a wire mesh or a film of which the surface is coated with aluminum is bound to the pulling ropes, so that the deployable surface device with the fixed truss structure is formed. The deployable surface device with the fixed truss structure has high composite performance indexes such as low areal density, simple structure, high deployable reliability, capacity of transmitting or converging electromagnetic waves in a long distance and the like, and can be used as a reflector or a converging device in space or on the ground.

The invention belongs to the technical field of illumination, and particularly discloses a single-tube laser conduction illumination system adopting echo infrared detection. The single-tube laser conduction illumination system comprises a single-tube laser conduction illumination system body, an infrared detection system, a control circuit and a power supply unit. By adopting optical fiber conduction, photoelectric separation is achieved, and the illumination safety is improved. By adopting transmission-type excitation, the light output efficiency is improved, the service life of a blue light LD is prolonged, and meanwhile the safety is improved. By adopting the infrared detection system and an independent infrared optical fiber, the light output condition can be monitored in time, if the transmission optical fiber is broken, a photoelectric element PD cannot receive red light reflected by a third light filtering system, then an instruction of disconnecting a power supply can be given, and the safety is improved. The single-tube laser conduction illumination system adopting echo infrared detection has the advantages of being high in light output efficiency, high in safety and the like.

The invention provides an LED display screen control system. The LED display screen control system comprises a scanning card (40) and LED lamp panel modules (50 and 60) connected with the scanning card (40), wherein the scanning card (40) comprises a data input / output circuit (43) and an image display control chip (20) arranged on a first circuit board; the image display control chip (20) is connected with the data input / output circuit (43), and is used for receiving a command packet and an image data packet through the data input / output circuit (43), and carrying out capture, correction, rearrangement and gray level extraction on the image data obtained by unpacking the image data packet according to parameter data obtained by unpacking the command packet, so that drive signal groups and display data groups are generated and converted into serial differential signal groups to be output to the LED lamp panel modules (50 and 60) for image display by the LED lamp panel modules (50 and 60). According to the LED display screen control system, the function of the scanning card is made chip-based to the greatest extent, and therefore, the purposes of reducing the size of the scanning card and improving the display effect of an LED display screen body are achieved.

The invention belongs to the technical field of lighting, and particularly discloses a laser lighting device which comprises a power source, a photoelectric conversion module, an optical fiber set and a laser excitation device. The photoelectric conversion module converts a current into a laser; the optical fiber set is a transmission part, the output end of the optical fiber set is provided with an optical fiber connecting terminal, and the laser is transmitted to the laser excitation device through the optical fiber connecting terminal; the laser excitation device comprises a nut, a laser excitation device fixing piece, a diffusion lens, a lens pressing ring, a fluorescent cap and a fluorescent cap pressing ring. and the laser enters the inner cavity of the laser excitation device firmware, is converted by the diffusion lens, then irradiates the fluorescent cap and excites white light. The laser lighting device is high in light emitting efficiency, long in service life, high in safety and the like.