39results about How to "Realize distributed monitoring" patented technology

The invention relates to a fiber grating pressure sensor, a manufacture method and a method for monitoring the load of an asphalt pavement, belonging to the test field of a civil engineering sensor. The structure comprises a metal outer shell (1), a Bragg fiber grating (2) and a polymer part (3), wherein the Bragg fiber grating (2) is mounted in metal outer shell (1), the polymer part (3) is used for encapsulating the Bragg fiber grating (2) in the metal outer shell (1) and comprises a left cube, a right cube and a spindly horizontal cube, the left cube and the right cube are fixed at the lower side of an upper metal cover (4), the spindly horizontal cube is fixed between the left cube and the right cube, the structure is integrally in a dumbbell shape; the Bragg fiber grating (2) is encapsulated in the spindly horizontal cube of the polymer part (3) along the horizontal direction, and transmission fibers at both ends extend out of the left cube and the right cube. By utilizing the dumbbell-shaped structure in the invention, the sensibilization of the fiber grating pressure sensor is realized, and the sensitivity of the sensor is increased.

The invention discloses a tunnel surrounding rock deformation distributed optical fiber monitoring method and device based on pipe-shed support. The method comprises the following steps: A, drilling a hole in a guide pipe by using a pipe shed drilling machine and enabling a sleeve to follow up; B, sealing an optical fiber joint by using a plastic film after a pipe-shed steel tube are in place; C, gluing an optical fiber measuring tube single section at a steel tube mouth by using an inner connection pipe; D, splicing optical fiber measuring tube single sections; E, installing a drilling hole sealing device; and F, connecting in series the sensing fibers of the optical fiber measuring tube single sections at different monitoring positions of a tunnel pipe-shed support structure by using an extension adapter. The outer sidewall of the optical fiber measuring tube single section has orthogonally symmetrical grooves. The end of the optical fiber measuring tube single section is provided with an extension adapter for easy splicing. The guide pipe is inserted into a steel arch frame in an inclined manner. The pipe-shed steel tube is located inside the guide pipe. The optical fiber measuring tube single sections are located in the pipe-shed steel tube. The method and device achieve tunnel pipe-shed support surrounding rock distributed monitoring and advanced monitoring, and has economical, convenient, anti-interference and durable performance.

The present invention relates to a slope monitoring multi-point displacement sensor based on fiber bending loss. The sensor comprises a plurality of displacement sensing units, there are one or more than one displacement sensing units which are connected in series in order, and each displacement sensing unit comprises one protective cover, one right connection leading optical fiber, one upper endtop plate, one capillary steel pipe, base materials, one lower end bottom plate, one left connection leading optical fiber and one optical fiber bow-tie modulation mechanism; the protective covers areconnected with the upper end top plates through bolts; the upper and lower surfaces of the base materials are fixedly connected with the upper end top plates and the lower end bottom plates; an axlewire of the base materials is provided with a guide groove hole, the capillary steel pipes pass through the guide groove hole, the lower ends of the capillary steel pipes are fixed at the lower end bottom plates, the upper ends of the capillary steel pipes are connected with the optical fiber bow-tie modulation mechanisms, and anchor heads are fixed at the lower surfaces of the lower end bottom plates; and the optical fiber bow-tie modulation mechanisms are arranged in the protective covers. The slope monitoring multi-point displacement sensor based on the fiber bending loss solves the problems of slope internal displacement distribution and remote real-time monitoring.

The invention discloses a distributed online monitoring and positioning method of cable partial discharge based on the psi-OTDR principle. The method comprises the following steps: establishing a cable partial discharge ultrasonic generation model, and calculating the intensity of a partial discharge ultrasonic wave; establishing a transmission model of ultrasonic waves in a cable, and calculatingultrasonic sound pressure intensity at an installation position of an optical fiber; establishing a relationship model of an ultrasonic sound pressure and optical fiber strain, and calculating a variable of sensing optical fiber strain under the action of the ultrasonic waves after the partial discharge of the cable occurs; calculating the light intensity of backward Rayleigh scattered light in the optical fiber after the partial discharge of the cable; and judging and positioning the partial discharge of the cable. By adopting the distributed online monitoring and positioning method disclosed by the invention, the distributed monitoring and positioning of partial discharge of the cable can be realized, and the abnormal discharge of the cable is reported in time, furthermore, the anti-interference ability is high, less equipment is required, the cost is low, and the monitoring method is of great significance to the safe operation of the cable.

The present invention discloses a pile foundation monitoring system based on a distributed fiber sensor. The system comprises a laser, a first coupler, a second coupler, a third coupler, a first detector, a second detector, a computing terminal and N sensing fiber foundation piles. The laser is connected with the first coupler; the first coupler is connected with the second coupler and the third coupler; the second coupler, the first detector and the computing terminal are connected in series in order; the third coupler, the second detector and the computing terminal are connected in series inorder; and a sensing arm fiber and a reference arm fiber which have the same length are connected between the second coupler and the third coupler. The sensing arm fiber is wound around the N sensingfiber foundation piles in order, and the reference arm fiber is wound around the N sensing fiber foundation piles in order. The pile foundation monitoring system based on a distributed fiber sensor is long in sensing distance and high in location precision, and obtained monitoring data is continuous and large in data volume and can timely and accurately provide deformation information.

The invention discloses an online monitoring system for the insulation state of a substation DC system. The system comprises multiple sets of DC leakage current detection devices and a signal merger and diagnosis unit. The DC leakage current detection devices are respectively used for detecting DC leakage current of all branches; each set of DC leakage current detection devices is provided with at least two DC leakage current detection devices which are used for detecting DC leakage current at different positions on the same branch respectively. The signal merger and diagnosis unit is used for detecting the voltage to earth of positive and negative buses and further wirelessly connected with all the DC leakage current detection devices to receive DC leakage current data transmitted by all the DC leakage current detection devices. The signal merger and diagnosis unit judges whether an insulation failure occurs or not and determines the position where the insulation failure occurs according to the detected voltage to earth of the positive and negative buses and the received DC leakage current data. The invention further discloses an online diagnosis method for the insulation state of the substation DC system.

The invention discloses an intelligent Internet-of-things building system configuration and has properties of flatness and no center. Comprehensive sensing of various physical parameters in an intelligent building constructed based on the Internet-of-things building configuration can be realized, new data sharing and work coordination requirements are satisfied, problems of a data island, incomplete data acquisition, low resource utilization rate and high operation and maintenance cost of a traditional intelligent building are solved, an operation and maintenance mode of the traditional intelligent building is changed, through heterogeneous network fusion, information gathering, decision diagnosis, feedback control and big data analysis, an integrated service management system capable of realizing unification between base-level equipment and upper-level applications is formed.

The present invention relates to a slope monitoring multi-point displacement sensor based on fiber bending loss. The sensor comprises a plurality of displacement sensing units, there are one or more than one displacement sensing units which are connected in series in order, and each displacement sensing unit comprises one protective cover, one right connection leading optical fiber, one upper endtop plate, one capillary steel pipe, base materials, one lower end bottom plate, one left connection leading optical fiber and one optical fiber bow-tie modulation mechanism; the protective covers areconnected with the upper end top plates through bolts; the upper and lower surfaces of the base materials are fixedly connected with the upper end top plates and the lower end bottom plates; an axlewire of the base materials is provided with a guide groove hole, the capillary steel pipes pass through the guide groove hole, the lower ends of the capillary steel pipes are fixed at the lower end bottom plates, the upper ends of the capillary steel pipes are connected with the optical fiber bow-tie modulation mechanisms, and anchor heads are fixed at the lower surfaces of the lower end bottom plates; and the optical fiber bow-tie modulation mechanisms are arranged in the protective covers. The slope monitoring multi-point displacement sensor based on the fiber bending loss solves the problems of slope internal displacement distribution and remote real-time monitoring.

The invention relates to the technical field of hoisting equipment, in particular to a spatial positioning device for a bridge crane. The spatial positioning device comprises an all-in-one machine, a microstructure optical fiber, an optical fiber fixing device, a wireless transmitting device and a control center of the crane; the signal output end of the all-in-one machine is electrically connected with the signal input end of the wireless transmitting device, the wireless transmitting device realizes real-time data transmission with the control center of the crane through a wireless communication technology, the microstructure optical fiber is electrically connected to the signal input end of the all-in-one machine, a plurality of sensing nodes are etched on the microstructure optical fiber, and the plurality of sensing nodes are distributed on the microstructure optical fiber at equal intervals. The invention further discloses a spatial positioning method for the bridge crane. The distributed acoustic sensing (DAS) system based on the microstructure optical fiber is applied to spatial positioning of the crane, the cost of the system is greatly saved, the complexity of the sensing system is reduced, and the spatial positioning method has the advantages of being high in electromagnetic interference resistance, long in sensing distance and the like.

The invention relates to a crack monitoring sensor and use method thereof based on an OTDR (optical time domain reflectometry) technique, and belongs to the technical field of monitoring of optical fibers. The crack monitoring sensor comprises a protection box, a bare optical fiber coil, a first optical fiber with a protecting layer, and a second optical fiber with a protecting layer, wherein the bare optical fiber coil is provided with two end joints, the bare optical fiber coil is an optical fiber coil which is formed by winding and knotting a bare optical fiber, and the diameter of the bare optical fiber coil is 14mm to 16mm. When the crack monitoring sensor is used, firstly, the outer optical fiber of the sensor is welded with the first optical fiber with the protecting layer and the second optical fiber with the protecting layer through the end joints, secondly, the adhering function of epoxy resin adhesive is released by an adhesive release agent, so that the inner optical of the sensor is ensured to be freely stretched along with the extension of the crack, and then the concrete is cast. The crack monitoring sensor and the use method have the advantages that the construction is convenient, the manufacturing is simple, the cost is low, the crack monitoring sensor and the use method are suitable for monitoring the cracks of various types of concrete inner structures, meanwhile, the operability is high, and the real-time monitoring and the distributed monitoring on the concrete inner structures are realized.