37results about How to "Small transmission attenuation" patented technology

An underwater short-distance high-speed wireless optical information transparent transmission device comprises a transmitting module and a receiving module, wherein the transmitting module sequentially comprises an LED modulation drive circuit, a blue-green mixed LED array, a transmitting light path, a beam expanding mirror and a homogenizing piece in the direction of an electrical signal to be transmitted, and the receiving module sequentially comprises a large-view-field receiving light path, a light filter, a Fresnel lens, a photoelectric detector and a photoelectric detection conditioning circuit. The underwater short-distance high-speed information transparent transmission problem can be solved, the lake, river and ocean environment application requirements are met, and the underwater short-distance high-speed wireless optical information transparent transmission device is especially suitable for connection of multiple sensors at deep position under the ocean, underwater data collection, ROV data interaction and continuous communication occasions for water surface platforms and underwater devices and has important significance in the ocean application field.

The invention discloses a hollow plastic optical fiber and an optical cable, wherein the hollow plastic optical fiber is provided with a coating layer, a transition layer and a hollow core layer; the hollow core layer is hollow; the refractive index of the transition layer is more than that of the coating layer. Through adopting the above scheme, the hollow plastic optical fiber adopts a hollow design, so that the transmission attenuation of optical signals is greatly reduced, the limitation that the plastic optical fiber only can transmit visible light is broken through, the plastic optical fiber can transmit full-spectrum light and is completely compatible with an existing optical fiber system for use; the production cost is reduced so as to be easy to industrialize; the transmission distance is much longer, the transmission rate is much higher, and the deficiencies of an existing step type plastic optical fiber are overcome; therefore, the hollow plastic optical fiber can completely substitute the existing communication-level step type plastic optical fiber but also can substitute a copper network cable, the effect and purpose of saving copper resources, saving energy and protecting environment are achieved, and very high market application value is provided.

The invention discloses an IEEE (Institute of Electrical and Electronic Engineers) 802.15.4g standard-based wireless monitoring communication protocol, and belongs to the technical field of embedded wireless monitoring. IEEE802.15.4g is a standard of a physical layer named SUN, which is established by Institute of Electrical and Electronic Engineers (IEEE) in recent two years, the physical layer is supplemented on the basis of an IEEE802.15.4 standard, and the IEEE802.15.4g standard is particularly suitable for battery powered infrastructure sensor networks which have ultralow power consumption, remote transmission and excellent anti-noise performance. Although IEEE802 is still standardized at present, a draft scale has been determined basically, so the set of standard is necessarily tracked and studied timely, and based on the underlying standard, a set of ultralow power consumption wireless upper-layer communication protocol applied to the field of smart grid monitoring is designed and developed. The protocol aims at a star network topological structure, working method steps for a network coordinator node and a sensor node are respectively designed, and the protocol has the characteristics of low velocity, ultralow power consumption, low complexity and the like.

This invention relates to a data precision instrument cable. An insulation layer of expanded PE material in skin-foam-skin co-extrusion is set on the conductor to form a core of the cable, multiple pair-groups of pair wires with pair twist screen layers are set in the core, each set wire is set with a conduction wire, the cable core is set with a gird, a general screen layer and an outer sheathing are set on it orderly and a conduction lead is set between them.

Said invention relates to improvement to signal transmission coaxial cable, featuring cable internal conductor outer physics sparkle insulating layer being secondary extruding composed double layer compound sparkle insulation. Due to adopting secondary physics sparkle extrusion laminating, said invention not only solves inside and outside cooling down misproportion problem and resulted fault of once extruded moulding of thick physics sparkle insulation, greatly raising radial and longitudinal sparkle hole uniformity without bunlla hole and cuniculus. For example the leakance RF coaxial cable sparkle degree can be raised to more than 78 per cent, reducing cable dielectric constant and dielectric loss tangent value, reducing cable transmission attenuation, voltage standing wave ratio less than 1.15 with fine product consistency. Said invented insulation physics sparkle forming method and mould is suitable for signal transmission coaxial cable sparkle insulation with greater than 10 mm sparkle insulation thickness.

The invention discloses a diamond film fluorescence efficient collecting device. The device comprises a laser and a computer, the laser emits green laser, and the green laser is coupled into an optical fiber through an optical fiber coupler and then transmitted to the tail end of an optical fiber probe through a double-color piece; a diamond film is fixedly arranged at the bottom of the tail end of the optical fiber probe; the microwave antenna is uniformly wound at the tail end of the optical fiber probe; a microwave signal of the microwave device acts on the NV color center of the diamond film through the microwave antenna; and a magnet is arranged below the diamond film and applies a magnetic field to the NV color center of the diamond film. The device has the beneficial effects that the diamond is adhered to the tail end of the optical fiber as a main sensing part, and laser is limited in the optical fiber by utilizing total reflection of electromagnetic waves in the optical fiber, so that the transmission attenuation of the optical fiber is reduced, and red fluorescence excited by a diamond film NV color center is efficiently collected.

The invention relates to a communication conversion method, conversion apparatus and conversion system. The communication conversion method comprises the following steps: receiving data from a first device; performing primary processing on the received data, wherein the data satisfy the requirements of a communication protocol for communication with a second device after the primary processing; searching a second device; and sending the data after the primary processing to the found second device.

The invention discloses a corrosion-resistant type flame-retardant orbital digital signal cable. An inner insulating layer is arranged on the outer surfaces of twisted single wires; a coating layer coats the outer surfaces of 2-20 wire groups; a first copper layer coats the outer surface of the inner insulating layer; a steel layer coats the outer surface of the first copper layer; a second copper layer coats the outer surface of the steel layer; the first copper layer is tightly connected with the inner surface of the steel layer through a first alloy layer; the second copper layer is tightly connected with the outer surface of the steel layer through a second alloy layer; an outer protective layer coats the outer surface of the second copper layer; the first alloy layer comprises copper, iron, molybdenum, chromium and carbon; the second alloy layer comprises copper, iron, molybdenum, chromium and carbon; and the thickness of a polyester tape is 0.03-0.06mm. According to the corrosion-resistant type flame-retardant orbital digital signal cable, the transmission attenuation of the cable is reduced; the formability, extensibility and good electrical conductivity of a product are improved; and the tensile strength is improved.

The invention discloses intelligent glasses with a sheltering function as well as a control system. A sensor judges whether people are out of the limited distance when washing televisions, computers,mobile phones and tablet personal computers; when the sensor senses that people are in the limited distance, a sheltering sheet shelters glass lenses on a glasses frame, voice and vibration prompt isconducted on the glass fame, and the effect of protecting eyesight is achieved. In addition, a glasses box which is in wireless communication with the glasses frame is designed, so that the glasses box and the glasses frame can perform voice prompt synchronously in the same space, the intelligent glasses are particularly suitable for young users, and parents can master the eye using habit of teenagers in real time through the prompt of the glasses box and can perform human reminding or intervention.

The invention provides a physically foamed insulation data signal line structure, which comprises a cable core and an insulated wrapping tape layer, a conductive shielding thermal insulation layer, aninner sheath, a double-steel-belt armor layer and an outer sheath, which are arranged outside the cable core. The cable core is formed by stranding a plurality of insulated single wires, wherein eachinsulated single wire is formed by a copper conductor and a skin-foam-skin physically foamed polyolefin insulation structure outside the copper conductor. The conductive shielding thermal insulationlayer is internally embedded with discharge copper wires. Cotton and hemp ropes are filled between the insulated single wires and the insulated wrapping tape layer and between the insulated single wires. The signal line structure is reasonable in design; the filled cotton and hemp ropes can improve tensile and anti-pressure performance of the signal line, so that the signal line is not vulnerableto external shock damage; the skin-foam-skin physically foamed polyolefin insulation structure has a good moisture-proof function and excellent insulation performance, thereby reducing transmission attenuation of the cable and effectively improving transmission performance of the cable; and besides, the conductive shielding thermal insulation layer improves shielding and thermal insulation performance of the signal line, and thus anti-signal interference ability is high.

The invention discloses a super-flexible communication cable in a 5G industrial internet digital system and a manufacturing method. An upper side of a conductor structure is formed by twisting a tin-plated oxygen-free copper conductor with the purity of 99.99% and 250D nylon wires. The maximum value of the direct-current resistance is 14 ohm/100 m, and a physical foaming fluorinated ethylene propylene insulating layer is used on an upper side of an insulating structure such that the dielectric constant of a cable core is reduced, the requirement of low attenuation of signal transmission is met, and the transmission rate of the cable core is improved. The invention relates to the technical field of communication cables. The invention discloses the super-flexible communication cable in the 5G industrial internet digital system and the manufacturing method. In order to improve the electromagnetic compatibility, a cable product adopts a form of extruding a semi-conductive surface insulating layer on the shielding structure; the manufacturing method is completed by using a one-step method, that is, four signal line pairs extrude a semi-conductive shielding material and a sheath materialsynchronously by using a special die such that a pair-twisting and longitudinal-wrapping aluminum foil process and a cabling process are reduced, two production processes are reduced, and the processcost is reduced.

The invention relates to the technical field of a RG-6 copper-coated steel coaxial cable fabrication process, in particular to a RG-6 copper-coated steel coaxial cable. The RG-6 copper-coated steel coaxial cable comprises a copper-coated steel conductor, an inner skin layer, a foam layer and an outer skin layer, wherein the raw material for fabricating the inner skin layer comprises the followingconstituents based on parts by weight: 0.3-0.7 part of ethylene-ethylhexyl copolymer and 23-27 parts of low-density polyethylene, the raw material for fabricating the foam layer comprises the following constituents based on parts by weight: 23-27 parts of HDPE 2911, 23-27 parts of HMA, 23-27 parts of low-density polyethylene and 0.3-0.7 of nucleating agent, and the raw material for fabricating theouter skin layer comprises the following constituents based on parts by weight: 0.3-0.7 part of ethylene-ethylhexyl copolymer and 23-27 parts of low-density polyethylene. The fabricated RG-6 copper-coated steel coaxial cable has the advantage of small transmission attenuation, and the signal transmission quality of the coaxial cable is favorably improved.

The invention discloses a flame-retardant railway signal cable. Six tinned copper wires are twisted on the outer surface of the tinned copper wire at the center; an inner insulating layer is arranged on the outer surfaces of the twisted single wires; a coating layer coats the outer surfaces of 2-20 wire groups; a first copper layer coats the outer surface of the inner insulating layer; a steel layer coats the outer surface of the first copper layer; a second copper layer coats the outer surface of the steel layer; the second copper layer is tightly connected with the outer surface of the steel layer through a second alloy layer; an outer protective layer coats the outer surface of the second copper layer; and the first alloy layer comprises copper, iron, molybdenum, chromium and carbon. The flame-retardant railway signal cable is beneficial to absorption of a magnetic field in an electromagnetic field; and the extensibility and the electrical conductivity are also improved.