36results about How to "Has the ability to resist electromagnetic interference" patented technology

The invention relates to a metro settlement monitoring system based on distributed optical fiber strain sensing. The system comprises a distributed optical fiber strain analyzer, a sensing optical fiber, a settlement meter, an air communicating tube, a liquid level communicating tube and a liquid storage tank. The distributed optical fiber strain analyzer and the sensing optical fiber form a sensing testing light path to monitor the optical fiber strain and temperature of each part on the light path, the settlement meter is mounted in a to-be-detected region, the air communicating tube is connected to the settlement meter and the liquid storage tank in series, and the liquid level communicating tube and the air communicating tube are separately connected to the settlement meter and the liquid storage tank in series, wherein the liquid level communicating tube is located below the liquid level and the air communicating tube is located above the liquid level. The system provided by the invention has the beneficial effects that (1) a single system can realize long-distance monitoring and transmission; (2) the system is low in cost and high in popularizing and applying feasibility; (3) a sensing end is not powered and communicated, and the system is simple in structure; and (4) the distributed optical fiber has the capability of anti-electromagnetic interference.

The invention relates to a differential strain type optical fiber Bragg raster-suspended belt scale belonging to the technical field of photoelectronic measurement. A dynamic beam of the device and a fixed base of a weighing roller are connected into a whole, the stressed end of a constant-strength cantilever beam is fixedly connected with the dynamic beam, the fixed end of the constant-strength cantilever beam is fixed on a static beam, an optical fiber Bragg raster is respectively pasted along the upper and lower surfaces of the constant-strength cantilever beam, and the optical fiber Bragg raster is connected with a signal processing device by using a signal wire. The belt scale realizes real-time and precise weighing, can simultaneously measure temperature and pressure and has strong anti-electromagnetic interference capacity.

The invention relates to introduction of a distributed optical fiber sensor and a tomographic imaging technology into monitoring of load distribution of a flexible thin plate structure and belongs tothe field of structural health monitoring. The introduction comprises the following steps: firstly, describing a bending mechanical model of the flexible thin plate structure by adopting a field theory method; secondly, constructing a mechanical model matched with a tomographic imaging method taking Radon conversion as a mathematical foundation; thirdly, adopting a sensor composed of two fiber bragg gratings which are mutually orthogonal in 0 degree/90 degrees; and according to strain measured by the sensor, calculating spatial second derivative of location deflection where the sensor is located, wherein a difference value of any two spatial second derivatives is namely the Radon conversion of a shear force field; fourthly, according to a principle that a monitored area is covered most widely while the most scanning lines are generated, constructing a sensor observation matrix; fifthly, according to the Radon conversion of the shear force field obtained in the step three, reconstructing the shear force field by adopting Radon inversion; and sixthly, solving divergence of the shear force field, wherein the divergence of the shear force field is namely the load distribution of the flexible thin plate structure.

The invention provides a big power electromagnetic compatible switch. The switch comprises an electric circuit, a power supply and a device. The invention adopts a soft-switching technique that: firstly, interference factors are directly eliminated by inhibiting an interference source; secondly, coupling and radiation between the interference source and the interfered equipment are eliminated so as to cut off the transmission route of the electromagnetic interference; and thirdly, the anti-interference ability of the interfered equipment is improved, the sensibility of the interfered equipment on noise is lowered, switch loss and switch noise are reduced. A buffer circuit is added to an input part of the switch control power supply, an EMI filter is added to an input and output circuit of the switch power supply, materials with good electric conductivity are used to shield electric fields, materials with high magnetic conductivity are used to shield magnetic fields, various measures are taken to achieve good anti-interference effects, so that the power switch is capable of resisting the electromagnetic interference and particularly meets related EMC standards in terms of lightning strike, surge, mains voltage, electric fields, magnetic fields, electromagnetic wave, static discharge, pulse train, voltage dip, RF electromagnetic field conduction anti-interference, radiation anti-interference, conduction emission, radiation emission and the like.

The invention provides a fiber Bragg grating (FBG) measuring method for deflection of a travelling crane, which comprises the following steps: taking the left end of a girder of the travelling crane as a starting point, arranging five measuring points respectively at the position one sixth, two sixths, three sixths, four sixths and five sixths away from the left end of a girder (2); arranging fiber Bragg gratings 5 respectively below each measuring point of the girder, utilizing fiber for connecting the fiber Bragg gratings 5 of all measuring points in series; and connecting the fiber Bragg gratings 5 optically with a signal processing device through input-output fiber 6. The measurement of the deflection of the travelling crane is converted to the measurement of central wave length displacement of the fiber Bragg grating, so that the real-time online monitoring is conducted on the girder of the travelling crane. The method can replace the current commonly used leveling instrument method for measurement, realize real-time measurement on the travelling crane, save time and effort, save manpower, and also can avoid visual error caused by human visual observation.

The invention belongs to the field of packaging equipment for weapons and equipment, and in particular relates to an ammunition box with multiple protective functions, including upper and lower box bodies, inner lining blocks and other components. The box body is injection-molded with high-impact polystyrene reinforced with carbon fiber short filaments; the inner liner is expanded polystyrene, and its surface is coated with an antistatic layer; at the joint of the box body, a tongue-shaped composite seal and an elastic body are installed. The airtight cavity has a double-sealed structure; a reinforced structure is added to the weak point of the drop; various types of projectile linings can be used. The present invention is an electrostatic subconductor as a whole, its strength is higher than that of high-impact polystyrene, and it has multiple protection functions such as moisture-proof, anti-collision, anti-static and anti-electromagnetic interference, and good sealing performance; the present invention adopts mature raw materials and processes for production, It has the characteristics of easy-to-obtain and recyclable materials, stable process, short production cycle, reliable function, high cost performance, suitable for packaging standardization and containerized transportation, etc., and can be used for multi-protection ammunition boxes required by new ammunition.

A multi-polar combined magnetic core with magnetic shielding function consists of a top board, a bottom board, a side frame and a plurality of magnetic core columns, and all the magnetic core columns are arranged in a magnetic shielding cavity which consists of the top board, the bottom board and the side frame. As a plurality of magnetic circuits are combined together, a separate assembly structure is adopted, the magnetic shielding cavity consists of the top board, the side frame and the bottom board, and all the magnetic core columns are arranged in the magnetic shielding cavity, the magnetic core with the combined structure can not only optimize the distribution of the magnetic circuits, reduce the size of an electronic component, expand the functions of the electronic component and meet the requirements of electronic devices on miniaturization and multiple functions, but also carry out the magnetic shielding on the electronic element, thus leading the electronic component to have the anti-electromagnetic interference ability and simultaneously greatly reducing the electromagnetic interference generated by the electronic component to the outside.

The invention discloses a sapphire tube black body cavity optical fiber temperature measurement device, wherein an optical system comprises a sapphire tube black body cavity, a lens assembly shot anda Y-shaped energy transfer optical fiber; a circuit system comprises a photoelectric detector, a signal processing module and a display module; the sapphire tube black body cavity is formed by coatinga film inside the sealed end of a sapphire tube; the sapphire tube black body cavity, as a sensing part, is in contact with a to-be-measured environment, and converges thermal radiation energy at anenvironment temperature to the Y-shaped energy transfer optical fiber through the lens assembly shot; the Y-shaped energy transfer optical fiber divides thermal radiation energy into two paths of energy beams; the photoelectric detector converts two paths of energy beams into electric signals and transmits the electric signals to the signal processing module to carry out signal processing so as toobtain a digital signal; and the display module obtains a to-be-measured temperature value according to the digital signal and carries out display. According to the invention, the black body cavity and the lens assembly shot are combined so as to avoid continuous exposure of the optical system in a severe environment; and the sapphire tube black body cavity optical fiber temperature measurement device is applicable to the field of high-temperature industries with the long-time temperature measurement requirement.

The invention relates to a hair temperature and humidity sensor based on optical fiber Bragg gratings and a using method thereof, and belongs to the technical field of photoelectron measurement. The hair temperature and humidity sensor comprises an adjusting screw, a support, fixing screws, the optical fiber Bragg gratings, an equal-strength cantilever beam, a hair bundle, a hair hook and connecting bodies, wherein the fixed end of the equal-strength cantilever beam is fixed on the inner side of the support through the fixing screws, the free end of the equal-strength cantilever beam is connected with one end of the hair bundle through one connecting body, the other end of the hair bundle is fixed on the hair hook through the other connecting body, the hair hook and a base of the support are integrated, the adjusting screw arranged at the bottom of the support is used for adjusting stress of the hair bundle, and the optical fiber Bragg gratings of the same model number are pasted on the symmetry central line of the upper surface and the lower surface of the equal-strength cantilever beam and are connected with a signal processing device. By means of the sensor, temperature and humidity can be measured at the same time, the anti-interference ability is strong, and intrinsic safety is good.

The invention discloses a stacked multi-channel Compton diode detector and a measuring method. The stacked multi-channel Compton diode detector comprises a detector shell, wherein N cable interfaces are arranged on the detector shell, N electrodes are fixed in the detector shell, a gap is reserved between the two adjacent electrodes, the cable interfaces correspond to the electrodes one to one, the electrodes and the corresponding cable interfaces are connected through metal leads, a channel of the detector is formed by the single electrode and the corresponding metal lead and the cable interface, N channels are arranged in the detector, the N is a positive integer larger than or equal to 2, and the detector shell is filled with an insulating medium. The stacked multi-channel Compton diodedetector and the measuring method of the present invention can be used for time-resolved X/gamma radiation spectrum measurement.

The invention provides a helix traveling wave tube slow wave structure working temperature measurement method and a corresponding working temperature measurement device. The device comprises a traveling wave tube, an optical fiber, a demodulator and a data processing device; at least one FBG is inscribed on the optical fiber, and the optical fiber is connected with the data processing device through the demodulator. The measurement device is characterized in that the optical fiber stretches into a tube shell of the traveling wave tube and is fixed to a step on the side face of a clamping rod arranged in the tube shell; the leading portion of the optical fiber is coated with a metal coating, and therefore the mechanical strength of the optical fiber and the leakproofness of the traveling wave tube are guaranteed. The measurement device can measure the working temperatures of a plurality of points in the traveling wave tube in a working state of the traveling wave tube and have few influences on electromagnetic field distribution in the traveling wave tube and the working performances of the traveling wave tube.

The invention discloses a pressure transmitter device used for sewage processing. The device comprises a shell, an insulating sheath, a sealing layer, a circuit board, a lead hole, a sensor core, a pressure taking seat, a bumper, a connector, an end cap, a bolt, a nut and a sealing gasket. The left end of the shell is provided with the end cap. The end cap is screwed and fixedly connected to the nut through the bolt. The left side of the end cap is provided with the connector. The circuit board is fixedly connected to the internal portion of the insulating sheath. The sealing layer is filled in the insulation sheath. The right end of the shell is provided with the pressure taking seat. The pressure taking seat is provided with a groove matching with the lower portion of the sensor core. The sensor core is embedded between the insulation sheath and the pressure taking seat. The structure is designed reasonably, sealing performance is good, through the arranged insulation sheath and thesealing layer, the circuit board can be effectively prevented from being corroded, an anti-electromagnetic-interference capability is possessed and measurement precision is high.

The invention relates to a laser-single mode fiber remote signaling signal sampling device, consisting of a laser sending circuit, a signal mode fiber, an optical signal on-off device and a laser signal receiving circuit, wherein the laser sending circuit is connected with one end of the signal mode fiber, a pigtail adapter at one end of the signal mode fiber is correspondingly mounted on a light through hole on one side of the optical signal on-off device, the laser signal receiving circuit is connected with one end of the signal mode fiber, and a pigtail adapter at the other end of the signal mode fiber is correspondingly mounted on a light through hole on the other side of the optical signal on-off device. According to the invention, through on/off of an optical signal loop, the operation state of monitored equipment is fed back and remote signaling information is transmitted to monitoring equipment. The laser-single mode fiber remote signaling signal sampling device is simple in structure, reliable in performance, low in power consumption and strong in electromagnetic interference resistance and can meet the requirement of live line work.

The invention discloses an intelligent operation inspection system and method for power transmission equipment, and the system comprises an operation inspection terminal, an intelligent operation inspection monitoring gateway, an intelligent operation inspection center station, an electric power overhead optical cable, and a plurality of control towers. The intelligent operation inspection center station comprises a laser, a first modulator, an electric signal source, and an analog-to-digital conversion module, and a first polarization analyzer, a first circulator, a second polarization analyzer, a demodulator and an optical detector. The control tower comprises a first micro-ring, a second micro-ring, a third micro-ring, a second circulator, a third circulator, a second modulator and a third modulator, the input end of the second modulator is connected with a first GPS antenna, the input end of the third modulator is connected with a second GPS antenna, and the third micro-ring is connected with a Sagnac reflector. The system is simple in structure, combined with an operation and maintenance method, can be effectively applied to operation and maintenance of the power transmission equipment, improves the operation and maintenance efficiency, is high in anti-electromagnetic interference capability, is suitable for working conditions with complex electromagnetic environments in the power transmission equipment, is remarkable in effect, and is convenient to popularize.

The invention relates to a control system for optimum frequency conversion point of a photon and the operation method thereof. The control system for optimum frequency conversion point of a photon is characterized by comprises the following steps: a part of the frequency converted light output of the light modulator is sent to the photovoltaic conversion module of the system as the return signals; the converted electrical signals enter the signal processing module through the signal extraction module; the electronically controlled signals is obtained through operations; and the control voltage is output to the light modulator through the decision module and the drive circuit module. The operation method comprises the following steps: initializing firstly; reading the electrical signals converted by the photoelectric conversion module, which is carried out by the signal extraction module; sending to the information processing module after preprocessing; performing curve fitting circularly on the signals; performing differential, integral and scaling operations to obtain the real time electronic control signals; outputting the control voltage to the light modulator through the decision module and the drive circuit module; and making the light modulator work at the optimum frequency conversion point. The hardware of the system disclosed by the invention realizes the rapid and precise control of the light modulator to work at the optimum frequency conversion point, therefore, the frequency of the outputting optical signals is stable, the dynamic range of the upper and lower frequency conversion of the frequency conversion of the photon is increased, the transmission loss is reduced, and the electromagnetic interference is also prevented.

The invention discloses a differential detection type optical accelerometer based on an F-P (Fabry-Perot) cavity with adjustable cavity length. Light of a wide-spectrum light source enters the optical waveguide through coupling of the spot-size converter, and 50: 50 light splitting is achieved through the 1: 2 type Y waveguide. The upper branch and the lower branch of the Y waveguide are equal in length and are each composed of an electrode modulation area, a Bragg grating area and an MMI waveguide reflecting mirror. Wherein the Bragg grating area is located at the fixed end, the MMI waveguide reflector is located on the movable mass block, and the fixed end and the movable mass block are connected through a first micro beam-main beam-second micro beam three-beam structure. An F-P cavity is formed between the Bragg grating and the MMI coupler, and the optical waveguide on the micro beam serves as a part of the cavity length. The input acceleration can be obtained by performing differential calculation on light intensity information received by the upper photoelectric detector and the lower photoelectric detector. The system is high in detection precision, reliability and integration level, can eliminate common-mode noise interference, and has certain anti-electromagnetic interference capability.