53results about How to "Transmission far" patented technology

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 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 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 present invention relates to a Golay complementary sequence-based phase-sensitive type optical time domain reflectometer. The reflectometer comprises an input light generating unit (1), a polarization-maintaining beam splitter (2), a coding sequence modulation unit (3), a circulator (6), an optical fiber to be measured (5), a zero-difference frequency shifter (6), a polarization control unit (7), a detection unit (8) and a signal demodulation unit (9). The invention also discloses an implementation method of the Golay complementary sequence-based phase-sensitive type optical time domain reflectometer. According to the Golay complementary sequence-based phase-sensitive type optical time domain reflectometer and the implementation method thereof of the invention, the detection unit adopts an I / Q demodulation system, and all optical field information, especially absolute phase information, of real backward Rayleigh scattered light can be effectively restored through a refined structure; local oscillation light gain makes the extremely weak signals of the tail end of the optical fiber become possible, and therefore, the sensing distance of the system can be prolonged.

The invention relates to a remote wireless vibration monitoring device, which comprises a vibration signal acquisition module and a wireless data transmission module, wherein the vibration signal acquisition module is communicated with the wireless data transmission module through a digital bus. The vibration signal acquisition module comprises a high-precision digital vibration sensor; and a microprocessor unit, a wireless transmit-receive unit and a power management unit are arranged in the wireless data transmission module. The microprocessor unit in the wireless data transmission module controls the high-precision digital vibration sensor in a bus communication mode to acquire a vibration signal; and the acquired vibration data is transferred to the wireless transmit-receive unit in a connection serial port mode, and the wireless transmit-receive unit transfers the received vibration data to the outside in a wireless way. The high-precision digital vibration sensor in the vibration signal acquisition module transfers the vibration signal in the wireless way. The remote wireless vibration monitoring device has reliable performance, is simple to operate and install, can be supplied with power through batteries, and has low energy consumption and an obvious effect.

The invention is a wire telephone frequency allocation network, which includes a interface device between the user terminal and the central office, and a transmitting circuit between the user terminal and the center interface device, the central interface device includes a center interface circuit, a modulating circuit and a frequency selecting circuit; the user interface device includes a user interface circuit, a modulating circuit and a frequency selecting and demodulating circuit; the cost is low, one pair can contain several users, the maintenance is easy.

The invention relates to a circular polarization soliton generation device and a multiphoton microimaging system. The circular polarization soliton generation device comprises a pump laser, a first quarter-wave plate, a first focusing lens and an optical fiber all located on the same path, wherein a linearly polarized beam generated by the pump laser is converted into a circularly polarized beam through the first quarter-wave plate, the circularly polarized beam passes through the focusing lens and then is coupled in the optical fiber, and the circularly polarized beam is converted into a circular polarization soliton after passing through the optical fiber. Through the first quarter-wave plate, the linearly polarized beam is converted into the circularly polarized beam, and then, the circularly polarized beam is converted into the circular polarization soliton after passing through the optical fiber. Tests prove that, under the same condition, energy of the circular polarization soliton is 1.56 times of the energy of a linear polarization soliton, thus, a multiphoton signal can be transmitted further in the brain, then, the human can further explore deep-seated tissues in the brain, and mysteries of the brain can be demystified.

The invention provides a multichannel digital measurement and control system based on an I2C bus. The multichannel digital measurement and control system comprises a master controller unit, an I2C busisolation and conversion unit, an I2C bus driving conversion unit, an I2C bus parallel input / output conversion unit, a multichannel input / output isolation and conversion unit and a user interface unit. The system makes parameter setting flexible and convenient, can perform quick, stable and seamless switching and can also adapt to working occasions of complicated electromagnetic environment, longer transmission distance and high communication accuracy, and the reliability and rapidity of the multichannel digital input / output measurement and control system are ensured.

The invention belongs to the technical field of fuel gas safety products and chemical product reproducts, relates to a sulfur-content-free odor additive for combustible gas, and a preparation method thereof, and especially relates to a natural gas sulfur-free odorant and a preparation method thereof. The sulfur-content-free odor additive for the combustible gas, disclosed by the invention, is prepared from, by weight, 30 to 40 parts of methyl acrylate, 55 to 69 parts of ethyl acrylate, 1.0 to 5.0 parts of 2-ethyl-3-methylpyrazine, 0.05 to 0.15 part of 2, 6-di-tert-butyl-4-methylphenol solid and 0.05 to 1.5 parts of hydroquinone. A trace amount of the odorant is added into the gas, so that the gas can warn that the odor concentration reaches the second level or above when the explosion lower limit of the gas is 20%, the gas can be immediately smelled once being leaked, and people can give an alarm, escape and self-rescue in time, so that the occurrence of gas leakage accidents is avoided or reduced, and the loss caused by the gas leakage accidents is avoided or reduced; and compared with the existing sulfur-free odorant, the sulfur-content-free odor additive solves the problem of self-aggregation under direct sunlight.

The invention provides a high-efficiency optical fiber monitoring system and belongs to the field of power monitoring equipment. The high-efficiency optical fiber monitoring system comprises a monitoring center, a communication network module and monitoring stations, wherein each monitoring station comprises an optical fiber distribution frame which is connected with an optical switch and an optical power meter, the optical switch and the optical power meter are connected with an optical time domain reflectometer, and the optical time domain reflectometer is connected with the communication network module; each optical fiber distribution frame is connected with multiple optical fiber circuits. The optical fiber monitoring system is a real-time and online intelligent communication quality automatic detection system with an early warning function, a manpower and instrument combined optical fiber transmission network maintenance mode in the prior art can be totally replaced, the transmission speed is very high due to the adoption of optical fibers, and the transmission efficiency is high.

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 invention provides a method and a device for measuring the length of a conductor cable. The method for measuring the length of a conductor cable comprises the steps that an initiating frame signalis transmitted to a conductor cable to be measured, the initiating frame signal comprises a first timing point, and a first moment when the first timing point is transmitted is recorded; a response frame signal transmitted by a response device is received through the conductor cable, the response frame signal comprises a second timing point, and a second moment when the second timing point is received is recorded; a time feedback frame signal transmitted by the response device is received, wherein the time feedback frame signal comprises a third moment when the response device receives the first timing point and a fourth moment when the response device transmits the second timing point; and the length of the conductor cable is measured according to the first moment, the second moment, thethird moment and the fourth moment. According to the invention, online measurement and measurement of the total length of multiple lines are supported, and harm to equipment connected to the lines isreduced.

The invention belongs to the technical field of illumination, and particularly discloses a multi-tube laser conduction illumination system adopting echo infrared detection. The multi-tube laser conduction illumination system comprises the multi-tube laser conduction illumination system, an infrared detection system, a control circuit and a power supply unit, optical fiber conduction is adopted, photoelectric separation is achieved, and illumination safety is improved; transmission-type excitation is adopted, so that the light extraction efficiency is improved, the service life of blue-light LDs is prolonged, and meanwhile, the safety is also improved; the plurality of blue-light LDs are adopted, so that the single-fiber energy can be effectively improved, the number of optical fibers is reduced, and the construction cost is saved; and the infrared detection system is adopted, an independent infrared optical fiber is adopted, the light extraction condition can be monitored in time, if a transmission optical fiber is broken, a photoelectric element PD cannot receive red light reflected by a third light filtering system, and therefore an instruction of cutting off a power source is given, and safety is improved. The multi-tube laser conduction illumination system adopting echo infrared detection has the advantages of being high in light extraction efficiency, high in safety and the like.

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 provides a wireless signal transfer system and a wireless signal transfer method. The wireless signal transfer system comprises at least one sending base station and at least one receiving base station, wherein the at least one sending base station converts a wireless transmission signal into a transfer signal; wherein the at least one sending base station transmit the transfer signal to the outside, the frequency f0 of the wireless transmission signal is greater than the frequency f1 of the transfer signal, and the at least one receiving base station receive the transfer signaland converts the transfer signal into the wireless transmission signal with the frequency f0.

The invention discloses a vehicle-mounted atmosphere lamp based on an LED light source. The lamp comprises a shell and a flexible optical fiber, an LED light source emitter and a light beam collimator are installed in the shell, the light beam collimator is provided with a light outlet, the flexible optical fiber is connected with the light outlet, the flexible optical fiber comprises a coating layer, a middle layer and a core layer, the coating layer wraps the outer part of the middle layer, the middle layer wraps the outer part of the core layer, and a plurality of scattering particles are uniformly arranged in the middle layer. The coupling efficiency of the flexible optical fiber light source is higher, the middle layer of the flexible lamp fiber is doped with a large number of scattering particles, it is guaranteed that the number of times of light refraction is larger, and light can be propagated by a farther distance in the flexible optical fiber.

The invention relates to a mobile fronthaul method based on an LWDM technology and a mobile fronthaul system based on the LWDM technology, which adopt the LWDM technology to realize multiplexing and transmission of high-speed services and solve the problem of insufficient optical cable resources in a 5G fronthaul application scene. A 1310 nm working window is mainly concentrated in a wave channel of the LWDM technology, and the problem of long-distance transmission of 5G fronthaul high-speed eCPRI / CPRI signals is solved due to the good dispersion characteristic of the LWDM technology. Compared with the CWDM technology, the LWDM technology has the advantages that the problem that dispersion affects the transmission distance is solved, longer transmission distance can be achieved, better transmission performance is achieved, meanwhile, light amplification can be conducted on the LWDM of 1310 nm wave bands through an SOA, and therefore the longer transmission distance is obtained. Multiplexing and transmission of high-speed optical signals are achieved through the LWDM technology, the multiplexing ratio includes but is not limited to 3-wave multiplexing, 6-wave multiplexing and 9-wave multiplexing, and multiplexed wave channels and a distribution scheme of the multiplexed wave channels can be randomly selected from 9 wavelengths of the LWDM according to requirements.

The invention discloses a powder energizing device. The powder energizing device comprises a barrel-shaped shell which is used as an auxiliary electrode, wherein one insulating layer covers the barrel-shaped shell; a conducting layer is stuck at the left side in the barrel-shaped shell; a main electrode is arranged in the middle in the barrel-shaped shell; a loop electrode is stuck at the right side in the barrel-shaped shell; meanwhile, an air outlet and an air feeding and blowing opening are formed in the upper end and the lower end of the barrel-shaped shell respectively. By adopting the powder energizing device, energy continuation time of air particles, aerosol particles and nano dry fog particles can be prolonged through one set of closed loop equipment with an electric field loop, so that pneumatic particles can be transferred for a relatively long distance, and furthermore, the powder energizing device can play a decisive role in atmosphere source governance.

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 belongs to the technical field of illumination, and particularly discloses a single-tube laser conduction illumination system adopting echo blue light detection. The single-tube laser conduction illumination system comprises a single-tube laser conduction illumination system body, an echo 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 echo blue light detection and adopting a light filtering system at the incidence end of a transmission optical fiber, reflected blue light is effectively transmitted to a photoelectric element PD, the light output condition can be monitored in time, and the safety is improved. The single-tube laser conduction illumination system adopting echo blue light detection has the advantages of being high in light output efficiency, high in safety and the like.

The invention relates to an antenna applied to a household image and sound apparatus having a wireless transmission function, which provides a household image and sound apparatus having the wireless transmission function, comprising an antenna for transmitting and receiving signal, which is an intelligent antenna utilizing a digital signal to process the technology and generate space orienting wave beams, the frequency of which satisfies the requirement of 802.11x. Comparing to a common antenna, the intelligent antenna according to the invention can eliminate the affect of common channel disturbance(CCI), multi address interference and multi path decadent.

The invention provides an optical orthogonal frequency division multiplexing system based on an avalanche photodiode and a method thereof. The method comprises the steps that an off-line DSB (Double Side-Band Transmission) module of a signal source device in the system produces a path of digital electrical signals with the modulation format being 4QAM-OFDM, and a digital-to-analog converter converts the digital electrical signals into analog electrical signals; an optical link device modulates the received analog electrical signals to optical carrier wave to be uploaded to a distant receiving terminal, and performs photoelectric detection on the analog electrical signals through the avalanche photodiode with high sensitivity, so as to realize optoelectronic conversion and obtain the analog electrical signals; and a signal processing device performs bandpass filtering, analog-to-digital conversion and demodulation on the received analog electrical signals, so as to obtain high-speed data bit including information, thereby realizing the transmission of optical orthogonal frequency division multiplexing.

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.