Yangtze Optical Fibre and Cable Joint Stock Limited Company

Wuhan University

Huazhong University of Science and Technology

Daye Special Steel Co., Ltd.

Hubei Cubic-ruiyi Instrument Co., Ltd

Cubic Sensor and Instrument Co., Ltd

Yangtze Optical Fibre Cable Joint Stock Limited Company

Hubei Superenergic Electric Power Co., Ltd.

State Grid Hubei Extra High Voltage Company

Jun Wu

Ruichun Wang

Lei Zhang

Shengya Long

Jihong Zhu

Rui Zhang

Zhengying Li

Youhui Xiong

Honghai Wang

Hai'ou Zhang

Chongyang Li

Jiaqi Wang

Hongyan Zhou

Mingliang Li

Xuelei Fu

Qian Wang

Huayu Zhang

Fusheng Dai

Li Zhu

Minlang Fan

Song Xie

Yi Shi

Wei Zhao

Yong Du

Jiang Liu

Shenli Wang

Chunlong Fan

Zhenyu Deng

Haitao Yang

Runsheng Li

Xushan Zhao

Kai Wang

Fan Xie

Youli Huangfu

Hua Cao

Housheng Zhang

Lipan Song

Liang Al

Wire arc additive manufacturing-spinning combined machining device and method are provided. The machining device includes a spinning mechanism and a fused deposition modeling mechanism. The spinning mechanism includes a machine tool and a spinning head. The spinning head is installed on the machine tool by a main shaft, and the main shaft is configured to drive the spinning head to rotate to achieve the movement in three vertical directions. The spinning head includes a spinning base and balls. Each of the balls is installed in a corresponding one of arc grooves at a bottom of the spinning base. The fused deposition modeling mechanism includes a moving track, a robot and a heat source generator. The arc moving track is arranged around the machine tool in a surrounding mode. The robot is movably installed on the moving track. The heat source generator is installed at a tail end of the robot.

Wire arc additive manufacturing-spinning combined machining device and method

An ultrasonic gas sensor includes a housing, and a first ultrasonic transducer and a second ultrasonic transducer that are separately arranged at a top of an inner chamber of the housing, where the first ultrasonic transducer and the second ultrasonic transducer form a V-shaped ultrasonic transmission path in the housing; the housing is provided therein with a gas inlet channel and a gas outlet channel; an upper end of the gas inlet channel is close to the first ultrasonic transducer, and an upper end of the gas outlet channel is close to the second ultrasonic transducer, such that a measured gas flow entering a bypass tube passes through a detection area of the first ultrasonic transducer and the second ultrasonic transducer; a lower end of the gas inlet channel and a lower end of the gas outlet channel communicate with a gas sensor mount.

Ultrasonic gas sensor

An anchor-free object detection method based on ultraviolet image includes: obtaining a ground-truth label of object detection, two label boxes corresponding to the two labels; obtaining a masked label based on the two labels and the two label boxes in the train set, and performing a same enhancement processing on the train set and the masked label; constructing an anchor-free object detection model including an encoding part, a decoding part and a detection head part including three detection heads, namely two anchor-free detection heads and one anchor-free dual-head detection head, and the dual-head of the anchor-free box dual-head detection head is an anchor-free detection head and an auxiliary detection head, respectively; training the model based on the enhanced train set and the enhanced masked label; and inputting the ultraviolet image data to be detected into the final anchor-free object detection model, to obtain an object detection result.

Anchor-free object detection method based on ultraviolet image, storage medium and electrical equipment

The present invention discloses a grating enhanced distributed vibration demodulation system based on three-pulse shearing interference, comprising: a laser device, a pulse optical modulator, a three-pulse generation polarization-maintaining structure, a first erbium-doped fiber amplifier, a first optical circulator, a fiber grating array, a second erbium-doped fiber amplifier, a second optical circulator, a three-in-three optical coupler, a first Faraday rotator mirror, a second Faraday rotator mirror, and a four-channel data acquisition card, On the basis of a distributed fiber grating vibration sensing system, three-pulse dislocation interference and three-in-three optical coupler digital phase demodulation technologies are adopted, XX and XY pulses are utilized to complement interference visibility, and demodulation is performed by selecting a better path, so that polarization fading resistance and interference signal high visibility in the distributed fiber grating vibration sensing system are realized.

Grating enhanced distributed vibration demodulation system and method based on three-pulse shearing interference

A method for rapidly measuring the roller pass major semi-axis of a three-roller reducing mill to improve the outer-diameter precision and surface quality of a steel pipe includes selecting a corresponding value of the average diameter of an elliptical pass, a value of a first major semi-axis, and a value of a minor semi-axis according to a rack station number of a special numerical control lathe; calculating a value of a first line segment according to an elliptic equation, the obtained value of the first major semi-axis, and the obtained value of the minor semi-axis; calculating a value of a second major semi-axis according to the right-angle triangle theorem and the value of the first line segment; and measuring a value of the first dimension by attaching three claws of a three-claw internal micrometer to three roller gaps.

Method for rapidly measuring roller pass major semi-axis of three-roller reducing mill

The invention provides a gas flow metering gas chamber and a gas flow meter. The gas flow meter includes the gas flow metering gas chamber, a display device and a housing. The gas flow meter gas cell includes a cavity, a gas inlet, a gas outlet, two ultrasonic transducer mounting holes and a reflection device. The signal emitted by the first ultrasonic transducer installed in the first ultrasonic transducer mounting hole and the signal emitted by the second ultrasonic transducer installed in the second ultrasonic transducer mounting hole intersects with each other to form an L-shaped reflection passage. Compared with V-shaped, W-shaped, and N-shaped reflection structures, the effective distance between the two ultrasonic transducers of the present invention more is increased, the cross section of the cavity is reduced, and the rate of the gas flow is increased, which avoids contamination contained in the measured gas to contaminate the ultrasonic transducers and thereby improves the measurement accuracy.

Flow metering chamber for a gas flow meter having transducer mounting holes and fairing mounted in the gas inlet

A method for correcting a phase jump caused by polarization-induced fading in optical fiber phase demodulation, including the steps of: 1, selecting a demodulated phase in the case of non-depolarization as historical sample data; 2, determining an autoregressive coefficient and a moving average coefficient of the autoregressive moving average model for the demodulated phase; 3, establishing a Kalman prediction model for the demodulated phase, and deriving recursive equations of the Kalman prediction model for the demodulated phase; and 4, judging whether a jump point exists in the actual demodulated phase, determining polarization states of lights if the jump point exists, and correcting the jump point when the polarization states of the lights are in polarization orthogonality by replacing the actual demodulated phase with a predicted phase value. The disclosure ensures the correctness of subsequent vibration-based signal processing.

Method for correcting phase jump caused by polarization-induced fading in optical fiber phase demodulation

A single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.9-4.8 &#x3bc;m and a relative refractive index difference of &#x2212;0.08% to 0.10%. The inner cladding layer has a radius of 9-14 &#x3bc;m and a relative refractive index difference of &#x2212;0.40% to &#x2212;0.15%. The trench cladding layer has a radius of 13-25 &#x3bc;m and a refractive index difference of &#x2212;0.7% to &#x2212;0.3%. The auxiliary outer cladding layer has a radius of 30-50 &#x3bc;m and a relative refractive index difference of &#x2212;0.4% to &#x2212;0.15%. The outer cladding layer is a pure silicon dioxide glass layer.

Single-mode fiber with ultra low attenuation

An optical fiber with ultra-low attenuation and large effective-area includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 4.8-6.5 &#x3bc;m, and a relative refractive index difference of &#x2212;0.06% to 0.10%. The inner cladding layer has a radius of 9-15 &#x3bc;m, and a relative refractive index difference of about &#x2212;0.40% to &#x2212;0.15%. The trench cladding layer has a radius of about 12-17 &#x3bc;m, and a relative refractive index difference of about &#x2212;0.8% to &#x2212;0.3%. The auxiliary outer cladding layer has a radius of about 37-50 &#x3bc;m, and a relative refractive index difference of about &#x2212;0.6% to &#x2212;0.25%. The outer cladding layer is a pure silicon-dioxide glass layer.

Single-mode optical fiber with ultra low attenuation and large effective area

An optical fiber with ultra-low attenuation and bend insensitivity includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 3.0-3.9 &#x3bc;m, and a relative refractive index difference of &#x2212;0.04% to 0.12%. The inner cladding layer has a radius of 8-14 &#x3bc;m, and a relative refractive index difference of about &#x2212;0.35% to &#x2212;0.10%. The trench cladding layer has a radius of about 14-20 &#x3bc;m, and a relative refractive index difference of about &#x2212;0.6% to &#x2212;0.2%. The auxiliary outer cladding layer has a radius of about 35-50 &#x3bc;m, and a relative refractive index difference of about &#x2212;0.4% to &#x2212;0.15%. The outer cladding layer is a pure silicon-dioxide glass layer.

Single mode optical fiber with ultra-low attenuation and bend insensibility

A bending-insensitive single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.0 to 3.9 &#x3bc;m and a relative refractive index of &#x2212;0.04% to 0.12%. The inner cladding layer has a radius of 8 to 14 &#x3bc;m and a relative refractive index &#x2212;0.35% to &#x2212;0.10%. The trench cladding layer has a radius of 14 to 20 &#x3bc;m and a relative refractive index of &#x2212;0.6% to &#x2212;0.2%. The auxiliary outer cladding layer has a radius of 35 to 50 &#x3bc;m and a relative refractive index of &#x2212;0.4% to &#x2212;0.15%. The outer cladding layer is a pure silica glass layer.

Bending-insensitive single-mode fiber with ultra low attenuation

A doping optimized single-mode optical fiber with ultra low attenuation includes a core layer and cladding layers. The cladding layers has an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The content of fluorine in the core layer is &#x2264;0.5 wt %, &#x394;Ge&#x2264;0.12%, &#x394;n&#x2264;0.12%. The content of fluorine in the inner cladding layer is 0.5-1.5 wt %, &#x394;n&#x2264;&#x2212;0.14%. The content of fluorine in the trench cladding layer is 1-3 wt %, &#x394;n&#x2264;&#x2212;0.25%. The content of fluorine in the auxiliary outer cladding layer is 0.5-2 wt %, &#x394;n&#x2264;&#x2212;0.14%. The outer cladding layer is a pure silicon dioxide glass layer and/or a metal-doped silicon dioxide glass layer.

Doping optimized single-mode optical fiber with ultra low attenuation

A single-mode fiber with an ultra-low attenuation and a large effective area includes a core layer having a radius of 4.8 to 6.5 and a relative refractive index difference &#x394;nof &#x2212;0.06% to 0.10%, and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The inner cladding layer has a radius of 9 to 15 &#x3bc;m and a relative refractive index difference of &#x2212;0.40% to &#x2212;0.15%. The trench cladding layer has a radius of 12 to 17 &#x3bc;m and a relative refractive index difference of &#x2212;0.8% to &#x2212;0.3%. The auxiliary outer cladding layer has a radius of 37 to 50 &#x3bc;m and a relative refractive index difference of &#x2212;0.6% to &#x2212;0.25%. The outer cladding layer is a pure-silicon-dioxide glass layer.

Single-mode fiber with ultralow attenuation and large effective area

Growing community of inventors

Hubei, China

Jun Wu