460results about How to "Immune to electromagnetic interference" patented technology

The invention discloses an electronic package and a manufacturing method thereof, the electronic package comprising: a carrying structure, a first electronic component, a second electronic component disposed on the carrying structure, a shielding structure covering the first electronic component but not covering the second electronic component, and a package covering the shielding structure and the second electronic component; so that the first electronic component will not be exposed to external electromagnetic interference when the electronic package is operated, and the first and second electronic components will not interfere with each other electromagnetically, the electrical operation function of the electronic package can be fulfilled normally and the electrical performance of the electronic package will not be affected.

The invention discloses a distributed fiber sound wave detection apparatus and method based on wave beam formation. The apparatus comprises a light source, a 1*2 coupler, a control and signal processing unit, an arbitrary waveform generator, a double-channel parallel Mach-Zehnder electro-optical modulator, a reference arm fiber, an erbium doped fiber amplifier, an optical filter, an annular device, a front-end reflector, a reference length fiber, a rear-end reflector, a sense fiber, a 90-degree optical mixer, and a balance detector. The method includes the steps: injecting signal light into the sense fiber, the signal light being modulated to be light pulses with a fixed frequency on a lower side and a sweep frequency on an upper side; mixing the returned signal light carrying light phase information and light frequency spectrum information of detecting points with local reference light; demodulating the light phase information and the light frequency spectrum information, and obtaining the frequency, amplitude and phase information of sound waves in the detecting points in the sense fiber; and finally calculating the position, intensity and frequency information of sound sources. The sensing function and the transmission function of a fiber are combined into one function. Therefore, the distributed fiber sound wave detection apparatus and method have the advantages that the detecting point scale is hundred times higher than that of the prior art.

The invention discloses a rock three-way pressure stress sensor based on optical fiber grating sensing. The rock three-way pressure stress sensor comprises a cubic box body, wherein the box body is provided with six surfaces; three of the six surfaces which share a vertex are stress surfaces; each of the other three surfaces which share the vertex is provided with a recessed disc and serves as a recessed disc surface; fastening screw holes which have the same size and are uniformly distributed are formed at the periphery of each recessed disc; an optical fiber channel is formed in the center of each recessed disc; a sensing film is connected to each recessed disc; a small circular thin plate in the middle of each sensing film is an effective pressure bearing surface, and an optical fiber grating is adhered to an inner surface of the small circular thin plate; a sensing film supporting end is arranged at the periphery of the effective pressure bearing surface; screw holes which have the same size and are uniformly distributed are formed at the periphery of the supporting end; a box body penetration hole is formed at each vertex of the stress surfaces and the recessed disc surfaces;and the optical fiber channels are connected with two box body penetration holes. The rock three-way pressure stress sensor is intrinsically safe, free from electromagnetic interference, high in long-term stability, large in range, high in accuracy, high in sealing performance, pressure-resistant, corrosion-resistant and the like.

The invention discloses a flight attitude determining method based on a polarized light sensor. According to the invention, adopted equipment comprises a three-axis gyroscope, a three-axis accelerometer, the polarized light sensor, a GPS and a flight control computer. A complementary filter algorithm is used to fuse sensor data; pitch angle and rolling angle errors of the angular speed of the gyroscope are revised through measured data of the accelerometer; and an course angle error of the angular speed of the gyroscope is revised through measured data of the polarized light sensor, so that the attitude measurement precision of an aircraft is improved. Compared with a traditional flight attitude reference system, the flight attitude determining method has the advantages that the flight attitude determining method is not interfered by electromagnetism, the measurement precision of static and dynamic environments is high and the like.

The invention provides a shape detection device and method based on a spiral FBG (fiber bragg grating) sensor array, and the device comprises the spiral FBG sensor array, an FBG demodulator, data collection and shape reconstruction equipment, and display equipment. The device does not need other peripheral auxiliary equipment, is not affected by electromagnetic interference, is good in medical compatibility, does not emit rays, and can achieve the long-distance remote monitoring. Through the spiral configuration of the FBG sensor array, the device can achieve the multi-point deformation detection of a single optical fiber, and forms a quasi-distributed detection system. Through the packaging of the optical fiber on a nickel-titanium alloy filament, the device protects a grating point from being worn, is strong in anti-interference capability, and enlarges the detection range. The device can obtain the shape of a flexible robot in real time, and is high in real-time response. Meanwhile, the device detects the curvature and torsion, is simple in detection method, can be used for the shape sensing detection in a gastroscope, colonoscope and a flexible/soft robot, and plays an important role in the flexible robots in the fields of dibaster assistance, medical rehabilitation and national defense security.

The invention discloses an intelligent optical fiber sensor applied to security systems. The intelligent optical fiber sensor is characterized in that an optical cable is used as a sensing detection unit for carrying out the precise positioning and object analysis and the like on ambient pressure and vibration; an optical fiber sensor array receives pressure and vibration information; an optical fiber sensing signal mode and recognition system carries out signal analysis processing on acquired data, and a specific ground sensing type is produced according to the obtained processing result; the numerical results enter an alarm control host, the sensing information processing result is automatically converted into an alarm signal by virtue of a software system of the alarm control host, and an alarm position is displayed in a three-dimensional electronic map mode on a tripod head; meanwhile, the alarm control host automatically extracts devices such as defence-area videos, linkage matrixes, digital video recorders, field visual and acousto-optic alarms and the like which are required to be linked, therefore, the video of an alarm field can be checked timely so as to make a protection strategy quickly.

The invention provides an archive management system based on blue light storage and an ant colony search algorithm thereof, comprising an archive collection system, an archive storage server, an optical disk library management server and an optical disk library. Specifically, electronic archive files are assembled, compressed and indexed by the archive collection system in the form of data streams. The ant colony search algorithm has the following specific steps: 1. Constructing a file retrieval path; 2. Updating that pheromone of archives retrieval; 3. Optimizing evaporation factor of searchpath. The algorithm can automatically adjust the information volatility factor, analyze the keywords, and call the relevant persistence layer data through the algorithm. The archives management systemadopts the optimized retrieval arithmetic, According to the characteristics of archives, ACA algorithm is used, its process and algorithm are analyzed, by combining the pheromone volatility, the effect of the pheromone volatility factor on the efficiency of algorithm retrieval is improved, and by combining differential evolution processing, efficient retrieval efficiency of massive data is realized.

A partial optical fiber discharge detecting system comprises a light source, an acoustic-optic modulation device, a sensing light path and a demodulating system. Frequency shifting and delaying are carried out on light emitted by the light source through the acoustic-optic modulation device, and only two paths of light with the same optical path can interfere in the sensing light path and a reference light path. When partial discharge signals occur outside, the generated sound waves act on the sensing light path, the phase position of the interference signals changes, and the related information (intensity, position and the like) of outside partial discharge signals can be obtained by demodulating the variable quantity. Compared with traditional electromagnetic sensing and piezoelectric sensing, optical fiber sensing is insulated from electromagnetism essentially, the sensing optical fiber can be arranged in insulating oil of a transformer, the sensitivity for detecting the partial discharge signals is further improved, multiplexing can be formed easily, and the partial discharge signals can be precisely positioned.

The invention relates to a visual locating method and a visual locating apparatus. The visual locating method comprises the steps of setting a plurality of marking points on an identification object; performing topological distinguishing on the marking points according to a position relationship among the marking points; establishing a linear equation set of three-dimensional coordinates of the marking points according to a topological relationship among the marking points, and solving the three-dimensional coordinates of the marking points; establishing a marking point coordinate system according to the three-dimensional coordinates of the marking points; and solving a rotary matrix of the marking point coordinate system to obtain pose information of the identification object. Through the visual locating method and the visual locating apparatus, real-time and high-precision locating of poses of the identification object free of remarkable natural features can be realized.

The invention discloses a resonant glimmer electromechanical closed loop optical frequency detecting device that is made up of CPU, signal acquisition unit A, signal acquisition unit B, and control signal generating unit that includes the step wave generate circuit, and voltage conversion circuit. The light intensity signal would be amplified, and filtered and transmitted to FPGA processor. The two digital signal would output wave length signal after processed to make intervene light intension be constant at resonant point. The CPU receives the signal and output two signals, and one is adjusting the frequency of first phase mover, and the other output constant step wave to the second phase frequency mover.

The invention relates to an intrinsic pressure type temperature compensation high-temperature high-pressure fiber grating sensor. A shell is provided with an inlet port in the radial direction, a left end of the shell is provided with a left coupling head of a left capillarity steel pipe, and a right end thereof is provided with a right coupling head of a right capillarity steel pipe, an elastic base is arranged in the shell and positioned at the side of the inlet port, the edge of the elastic base is provided with axial holes, an optical fiber is provided with a pressure sensing fiber grating and a temperature sensing fiber grating, and penetrates the left capillarity steel pipe to be arranged at the outer side of the elastic base, and the other end of the optical fiber extends out of the shell through the right capillarity steel pipe. By laboratory tests and high-temperature high-pressure oil well actual examination on the producing scene, the sensor of the invention has the pressure detection range of 0 to 100MPa, the temperature detection range of minus 30 to plus 350 DEG C, the pressure sensitivity coefficient of 14pm/MPa, the temperature sensitivity coefficient of 12pm/DEG C, the pressure absolute precision of plus or minus 0.2MPa and the temperature absolute precision of plus or minus 0.5 DEG C, and can be promoted and applied under the oil well.

The invention provides a novel optical fibre current sensor system, comprising a control unit and a sensing head connected with the control unit through a sensing optical cable. The sensing head comprises an electric cable and a sensing optical cable winding the electric cable; a sensing optical fibre and a reference optical fibre are encapsulated in the sensing optical cable; magnetostrictive materials are coated on the sensing optical fibre; the control unit comprises a laser, an optical fibre coupler connected with the laser, a reflector connected with the optical fibre coupler through thesensing optical cable, a photoelectric converter connected with the optical fibre coupler, a data processor connected with the photoelectric converter and a signal collector connected with the data processor and used for collecting output signals of the data processor and transmitting the signals to a computer for analysis and processing. The system adopts the optical fibre as the sensing medium and has the characteristics of high sensitivity, small volume, anti-electromagnetic interference, high-voltage resistance, favorable safety, and the like when compared with the traditional current sensor.

The invention discloses a visible light communication system, which is used for data transmission between portable devices. The system comprises at least one first portable device (1) and at least one second portable device (2), wherein the first portable device at least comprises a light-emitting diode (LED) lamp (3); the on/off state of the LED lamp in a timing sequence refers to data to be transmitted; the second portable device at least comprises an optical inductor (4); the optical inductor can induce the on/off state of the LED lamp in the timing sequence so as to receive the data which refer to the on/off state; and the LED lamp can consist of a white light LED. According to the system, the configuration of the portable device is not required to be increased, and the highest data transmission rate can reach 1Gbits/s; and therefore, the visible light communication system has the advantages of low cost and high efficiency.

The invention relates to a method and a device for transforming electric analog signals; wherein the method comprises the following steps: transforming the electric analog signals output by a real-time digital simulation device into electric digital signals; processing the electric digital signals to generate standard digital signals meeting communication standards of a transformer substation; processing the standard digital signals meeting the communication standards of the transformer substation to generate sampling value messages meeting the communication standards of the transformer substation; transmitting the sampling value messages meeting the communication standards of the transformer substation to a digital relay protection device to be detected. The electric analog signal transformation device of the invention can be employed to enable the RTDS to detect the digital relay protection device in a convenient and reliable manner.

The invention discloses a detection system for optic-fibre leakage at the bottom of a normal atmosphere storage tank, which comprises a plurality of sensing systems. lasers are adopted for the plurality of sensing systems as incoming ray sources which are connected to optical intensity style optical fibre sensing probes via optical fibres and are divided into a plurality of routes via optical-fibre couplers and reach a plurality of sensing probes, reflex detected by the sensing probes enters PIN tubes and are connected with a data collection card via a photoelectric conversion circuit and an amplifying circuit, the data collection card is connected with an industrial computer for data analysis, processing, displaying and recording. The detecting system alarms by software automatically. The system has high precision detection, rapid speed, timely alarm, accurate location, strong anti-interference capability, high safety and convenient system operation, can display where the storage tank leaks and how long the storage tank leaks in real-time by curve mode and digital mode and has aural and visual alarm. Due to the flexible system communication mode, the invention can realize off-site search and monitoring, thereby accelerating processing speed, decreasing economic loss and reducing environment pollutions.

The invention discloses a coupling refractive index meter for an evanescent field among optical fibers and a detecting method of the coupling refractive index meter. The coupling refractive index meter comprises a light source, an optical fiber sensor probe, an optical fiber coupler/circulator, a first photoelectric detector, a second photoelectric detector and a data collecting and processing module, wherein the optical fiber sensor probe comprises an optical fiber engraved with inclined optical fiber gratings and a D-type optical fiber which are parallelly arranged and tightly closed; the light source is connected with one end of the optical fiber engraved with the inclined optical fiber gratings through the optical fiber coupler/circulator; the optical fiber engraved with the inclined optical fiber gratings is connected with the input end of the second photoelectric detector through the optical fiber coupler/circulator; one end of the D-type optical fiber is connected with the input end of the first photoelectric detector through a single mode optical fiber; one end, connected with the optical fiber coupler/circulator, of the optical fiber engraved with the inclined optical fiber gratings and one end, connected with the first photoelectric detector, of the D-type optical fiber are on the same side; the first photoelectric detector and the second photoelectric detector are separately connected with the data collecting and processing module. The coupling refractive index meter has the advantage of being higher in refractive index measuring accuracy.

The invention discloses a distributed optical fiber sound sensing device and method based on dual-polarization double-sideband modulation. The distributed optical fiber sound sensing device comprisesa narrow linewidth laser source (1), a polarization-maintaining optical fiber isolator (2), a dual-polarization four-parallel Mach-zehnder electro-optic modulator (3), an arbitrary waveform generator(4) for drive in an X polarization direction, an arbitrary waveform generator (5) for drive in a Y polarization direction, an electro-optic modulator bias control panel (6), a 1*2 polarization-maintaining optical fiber coupler (7), an optical fiber polarization beam splitter (8), a first erbium-doped optical fiber amplifier (9), a first optical fiber (10), an optical fiber circulator (11), a second erbium-doped optical fiber amplifier (13), a second optical fiber (14), a four-way output-type 90-degree light mixer (15), a balance photoelectric detector (16), a data acquisition card (17) and a processing unit (18). The distributed optical fiber sound sensing device integrates the advantages of time-domain reflection and frequency-domain reflection, is free from electromagnetic interference,is electrically passive and can achieve distributed sound sensing with a large dynamic range and high spatial resolution.

The invention provides a simulation test platform for measuring thickness of an oil film between a cylinder sleeve and a piston of a diesel engine based on Gamma rays. The simulation test platform comprises a diesel engine cylinder sleeve-piston reciprocating motion simulating bench which is fixed on the test platform, a data acquisition device and a data processing device, wherein the diesel engine cylinder sleeve-piston reciprocating motion simulating bench comprises a diesel engine cylinder body, a cylinder sleeve matched with the cylinder body, a piston positioned in the cylinder sleeve and a bench power unit; the data acquisition device comprises an oil film thickness detection device; a collimation Gamma radioactive source device emits collimation Gamma rays, the emitted Gamma rays penetrate through the outer side of the piston skirt, the oil film and the cylinder sleeve, and are received by a probe, which is used for indicating the thickness of the oil film. According to the simulation test platform for measuring thickness of the oil film between the cylinder sleeve and the piston of the diesel engine based on Gamma rays, the cylinder sleeve does not need to be punched, and the collimation Gamma radioactive source device is embedded in the inner side of the piston skirt, so that the influence on the cylinder sleeve-piston is less, and in addition, as the Gamma rays are stable and immune to electromagnetic interference, the thickness of the oil film between the cylinder sleeve and the piston can be collected conveniently and effectively.

The invention discloses an optical fiber intelligent sensor used in a security system. An optical cable is used as a sensing and detecting unit for outside accurate invasion point positioning, outside invasive object analysis and the like; when an invader tries to go across or damage a guardrail, an optical sensor array can receive ground vibration information, an optical fiber vibration signal mode and recognition system performs signal analytic processing of collected information, a specific invaded ground vibration type is generated according to the processing result, the numerical result is input into an alarming control master computer, the vibration information processing result is converted by the software system of the alarming control master computer into an alarming signal automatically, the alarming position is displayed in form of three-dimensional electronic map on a cable head, and at the same time, the alarming control master computer automatically extract security area videos, a linked matrix, a hardware video recorder and equipment to be linked such as on-site lighting and sound and light alarming equipment. Thus, video of the alarming site can be viewed as soon as possible so as to make a security policy quickly.