172results about How to "Good anti-interference" patented technology

The invention provides an intelligent control system for LED tunnel lamps and a method for controlling the LED tunnel lamps. The system comprises a control center PC computer, a tunnel lamp controllerand lamps, wherein a brightness/temperature/current sensor is connected with the controller via a transmission medium; the control center PC computer is connected with a plurality of drive control modules via the controller and a bus structure; and each drive control module is connected with a constant-current driving power supply of each LED tunnel lamp. Therefore, the system detects the intensity and weakness of light at the entrance and exit of a tunnel in real time via optical detectors distributed in the tunnel by applying highly accurate intelligent detection measure based on an advanced RISC microprocessor, and feeds processed data back to a control center; the control center processes the data and controls various tunnel lamps at different positions so as to control the brightnessof the LED tunnel lamps at different positions and finally achieve the aim of saving energy source.

The invention relates to an oil production well productivity tracking and evaluating method. The method comprises the following steps of 1) during a fracture construction process, adding liquid indicator agent into a blending truck when preparing prepad fluid and carrying fluid; 2) during the fracture fluid recovery process, performing continuous tracking, monitoring, sampling and measuring; 3) during a pumping overlayer production process, performing sampling at the mouth of a well or a measuring station, obtaining the amount of tracked pumped fluid during normal operation, wherein sampling includes different requirements on different wells; 4) respectively measuring the concentration of liquid indicator agent and the illumination intensity of every preprocessed sample through analyzing instruments to calculate out contribution rate, recovery rate, recovery amount and the like. According to the oil production well productivity tracking and evaluating method, by means of classification, analysis, processing and study of the liquid indicator agent, relevant information such as production liquid component status, productivity (contribution rate), fracture effects and the like.

The invention discloses a small leakage detection system for a liquid pipeline and relates to the technical fields of tests not included in other classes, acoustic wave measurement and pipeline systems. On the premise of not changing technological processes of current pipelines, a leakage detection ball is sent out by a pipe cleaner ball sending device and flows along with a medium in the pipeline; meanwhile, acoustic signals inside the pipeline and state information of the leakage detection ball are acquired, stored and tagged with time labels; after the leakage detection ball is collected back from a ball collecting bucket, the small leakage detection system is connected with an upper computer, so that the acoustic information stored in the pipeline and the state information of the leakage detection ball are obtained; the obtained acoustic information is directly displayed in an oscillograph on the upper computer; except a ball sending bucket and the ball collecting bucket, if an acoustic amplitude is higher than that of noise in the pipeline, the corresponding time is judged to be the leakage point and recorded; according to the recorded time of the leakage point, the state information of the leakage detection ball is subjected to quadratic integral so as to obtain displacement of the leakage detection ball relative to the ball sending bucket, namely the leakage position. The small leakage detection system for the liquid pipeline can detect small and even tiny leakages and is high in sensitivity.

The invention discloses a robust resource allocation algorithm of a cognitive heterogeneous wireless network and belongs to the technical field of communication cognitive heterogeneous wireless networks. The robust resource allocation algorithm is characterized by considering a robust resource allocation algorithm in a cognitive heterogeneous multi-network environment influenced by channel parameter perturbation, considering cross-layer interference constraint and bounded channel uncertainty and interference power uncertainty in an objective function, converting the original infinite dimensional multivariate optimization problem into the convex optimization problem of certainty by using a robust optimization theory, obtaining a robust power control algorithm by using a lagrangian duality method, and achieving sharing of the robust resource of the cognitive heterogeneous wireless network. Simulation results show that the algorithm can effectively protect the performance of users of a macro-cellular network and has stronger robustness.

The invention discloses a voltage and current switchable type electric leakage protection device. The voltage and current switchable type electric leakage protection device comprises a release, a rectifier diode, a silicon controlled rectifier, an indicator light circuit, a voltage reduction circuit, a first amplification circuit, a zero sequence current transformer, a test circuit, a second amplification circuit and an overtemperature detection circuit, wherein the second amplification circuit is further provided with a ground wire current transformer and a ground wire voltage detection circuit. The novel voltage and current switchable type electric leakage protection device can shut off power supply under the conditions that the load end is zero, a phase line has electric leakage and a power supply socket ground wire is charged.

The invention provides an extra-high voltage direct current transmission line boundary element forming method based on a support vector machine (SVM). The method comprises the following steps: when the direct current line has fault, computing the anode line polar wave voltage and the cathode line polar wave voltage according to the direct current voltage and direct current of the two poles measured in the relay location of the line; selecting the discrete polar wave voltage signal of the fault pole, with sampling sequence length of 200, after fault to undergo S transform to obtain a 101*200 time-frequency complex matrix and computing the modules of elements in the complex matrix; computing the energy values corresponding to the first 20 frequencies according to the modular matrix obtainedthrough S transform, sticking tag values to the energy values as the characteristic quantity and inputting the characteristic quantity to the SVM to be trained; and distinguishing the area fault fromthe out-area fault according to the training result of the SVM. Lots of simulation results show the method has good effect.

The invention discloses a system and a method for transmitting low interception signals, which are suitable for a high-throughput and delay sensibility wireless network that mainly uses burst service. The system and the method are used for splitting a message group in the traditional group wireless network into a series of even and short data sub-blocks and defusing the grouping conflict into thecollision among a plurality of few sub-blocks by frequency hopping and time hopping two-dimensional pseudo-random modulation, are combined with channel coding with good deletion performance to realize the full-duplex transmission of emission and multi-path reception, not only increases channel utilization rate and network throughput, but also have good anti-interference and low-interception performance; meanwhile, by combining an asynchronous competitive channel access system, the system and the method are not only capable of avoiding a complicated resource scheduling algorithm and reducing channel access time delay, but also can satisfy multi-user access at the same time; finally, the system and the method can slowly reduce the throughput of an overload network, avoid the systemic breakdown caused by overload and increases the network robustness.

A modulation-free frequency stabilizer of an external cavity semiconductor laser consists of a single frequency narrow-linewidth external-cavity semiconductor laser, a Faraday isolator, a first half-wave plate, a polarization beam splitter, a Sagnac ring, a differential detection circuit consisting of two photoelectric diode detectors, a subtraction circuit, a proportional-integral-differential processing circuit and a switch. The modulation-free frequency stabilizer has the advantages of simple structure, good frequency stabilization effect, low cost and the like.

The invention discloses a voice output method, comprising steps of establishing a lip portion image voice database, obtaining a lip portion image, searching the voice data corresponding to the obtained lip portion image according to the lip portion image voice database, and outputting the voice corresponding to the lip portion image. The invention also provides a voice output system using the voice output method. The voice output method and the voice output system output the voice after searching the voice data corresponding to the obtained lip portion image according to the lip portion image voice database, realize the communication mode from the mute to the sound and have advantages of wide applicability and good interference resistance.

The invention provides a spherical tank health monitoring system based on an optical fiber acoustic emission technique. The system comprises a signal conditioning subsystem, an electro-optical conversion subsystem, a photovoltaic conversion subsystem, a computer and more than one acoustic emission sensors, wherein the more than one acoustic emission sensors are fixedly arranged at a key part of the surface of a spherical tank to be monitored; the output ends of the acoustic emission sensors are electrically connected with the input end of the signal conditioning subsystem; the output end of the signal conditioning subsystem is electrically connected with the input end of the electro-optical conversion subsystem; the output end of the electro-optical conversion subsystem is electrically connected with the input end of the photovoltaic conversion subsystem; the output end of the photovoltaic conversion subsystem is electrically connected with the input end of the photovoltaic conversion subsystem by virtue of an optical fiber; and the output end of the photovoltaic conversion subsystem is electrically connected with the input end of the computer; and therefore, the health condition of the spherical tank is monitored in real time; and moreover, the system also has the advantages of long transmission distance, good anti-interference performance and the like and can be used for effectively monitoring the health condition of the spherical tank for a long time.

The invention discloses a temperature sensing module which comprises a first temperature sensor and a second temperature sensor. The first temperature sensor is used for sensing the ambient temperature, while the second temperature sensor is used for sensing the temperature of eardrum. The first temperature sensor adopts a thermal diode, while the second temperature sensor can adopt a thermopile type thermal sensor or an infrared temperature sensor (CMOS-IR Detector) which is manufactured by the complementary metal-oxide semiconductor manufacturing technology. The temperature sensors are both made of semiconductor material so as to maintain identical physical properties. Even if the temperature sensors are simultaneously operated under the conditions with different temperature, the heating/cooling rates thereof are identical. The invention has the advantages of simple correction, low manufacturing cost and low power consumption.

The invention can transmits several decade routes of compressed audio and video digital signals on power line, broadcast cable or other kind of cables while not effecting the operations of other devices on said lines or cables. Due to the interference produced by trains, the invention uses the frequency letting-by technology and the contention resolution technology to make OFDM ultra-wideband carrier wave technology have higher anti-interference capability. The invention can be realized on the power line or broadcast cable used by railway train and underground railway station.

The invention provides a rapid lighting adjustment control method for an automatic gain control type photoelectric pulse oximeter. The method comprises the following steps: (S1) carrying out parameterinitialization; (S2) carrying out real-time detection until a tested part is recognized, adjusting a driving current to a default value, and starting a lighting adjustment process; (S3) adjusting a baseline by virtue of a first lighting adjustment algorithm until the baseline is adjusted to a base line target region; (S4) adjusting baseline drift by virtue of a second lighting adjustment algorithm; and (S5) extracting a pulse wave signal. According to the method, the rapid lighting adjustment can be realized, the range of the dynamic adjustment is expanded through automatic gain, so that themethod can be well compatible with various types of probes; and meanwhile, the interference resistance is optimized under a motion condition, so that high-quality PPG signal data are provided for thesignal processing of photoelectric pulse waves. Experiments prove that the waveform response speed of the method can be decreased from 5-6 seconds in the prior art to be within 3 seconds, waveform breakpoints and lighting adjustment trigger are fewer under the motion condition, and the waveform quality is stable and reliable.

The invention discloses a shading film and relates to the field of an FPC (flexible circuit board). The shading film comprises a black PI (polyimide) layer, a black rubber layer and copper foil, wherein the black PI layer, the black rubber layer and the copper foil are sequentially coated with an adhesive for adhesion, and the adhesive is prepared from raw materials in percentage by weight as follows: 10%-15% of rubber, 10%-12% of a flame retardant, 3%-5% of a curing agent, 0.05%-0.1% of an ion catcher, 0.1%-0.5% of an antioxidant, 0.1%-0.5% of an accelerant, 15%-20% of resin, 30%-40% of carbon powder and 6.9%-31.75% of a diluent. The invention further discloses the FPC. The shading film and the FPC have good signal shielding effect and anti-disturbance performance and can block unnecessary light.

The invention relates to a communication method of a fast frequency hopping multi-transmitting and multi-receiving system based on a high-speed bus and a GPU (Graphic Processing Unit), which belongs to the technical field of communication. The invention integrates a multi-transmitting and multi-receiving transmission and receiving diversity technology with a fast frequency hopping technology. A parallel processing technology is adopted at a receiving end, and the time needed for synchronizing frequency-hopping signals at the receiving end is greatly shortened by introducing an efficient synchronous algorithm and a pseudo code technology and by adopting the high speed bus and the GPU. Under the adopted design rule of frequency-hopping patterns, signals of a plurality of frequency-hopping patterns can be simultaneously tracked by using a mixer, thereby reducing the cost of the receiving end. A transmitting end launches a plurality of signals using different frequency-hopping patterns simultaneously, and transmitted information can be correctly obtained by synchronizing the multi-path signals simultaneously, therefore, the capturing difficulty and the confidentiality of the signals are improved.

The invention relates to a side suction type range hood. The side suction type range hood comprises a case (1) and a fan system (10) mounted in the case (1), wherein a fume collecting hood (2) is arranged below the case (1), a panel (3) inclining towards a user is arranged in front of the fume collecting hood (2), an air inlet is formed in the panel (3), a fume blocking plate (4) connected with the panel (2) is arranged above the air inlet, and an air intake vent (17) leading to the fan system is arranged on the case (1); the air inlet in the panel is communicated with the air intake vent (17)on the case (1) through an air inlet channel. The side suction type range hood is characterized in that the air inlet in the panel (3) is divided into a left air inlet (21) and a right air inlet (22), and a partition board (9) is arranged in the fume collecting hood (2) to divide the air inlet channel into a left air inlet flue (31) and a right air inlet flue (32). Compared with the prior art, the side suction type range hood has the advantages as follows: the partition board is used for dividing the air inlet channel into the left air inlet flue and the right air inlet flue, so that energy loss caused by counter-collision of air from the two flues can be effectively avoided.

The invention relates to a monitoring and positioning device for leakage of a gas delivery pipe. The monitoring and positioning device comprises a monitoring host, a monitoring extension set and piezoelectric ceramic sensors, wherein the piezoelectric ceramic sensors are arranged at two ends of a gas pipe, the monitoring extension set is connected with the monitoring host in a communication way, a GPS (global positioning system) antenna is installed on the monitoring extension set, the piezoelectric ceramic sensors are arranged on gas pipes at the initial station and the terminal station, a signal amplifier is connected at the rear end of the piezoelectric ceramic sensor, the signal output end of the signal amplifier is connected with a data acquisition card of the monitoring extension set, and the audio receiving frequency of the piezoelectric sensor is 0.1Hz-10Hz. The monitoring and positioning device can sample and distinguish infrasonic wave of frequencies of 0.1Hz-10Hz in the gas pipes and are used for online monitoring on gas leakage. Proved by practice, the accuracy of the device on judging leakage can reach more than 98 percent; and compared with existing leakage monitoring devices, the device has considerable progress no matter in distinguishing efficiency or feasibility.

The invention discloses a visible light audio transmission system based on a phase-locked loop. The existing visible light audio transmission system has high running cost and maintenance cost and poor anti-interference performance. A microphone receives the outside sound, the sound is input into an analog-to-digital conversion module to convert the analog quantity to the digital quantity, and then after a modulation module modulates the digital quantity, a modulated signal is loaded to LED (Light Emitting Diode) light to be transmitted through a transmitting circuit module; a silicon photocell receives a modulated light signal and converts the modulated light signal to an electric signal through a receiving circuit module, a demodulation module demodulates the electric signals and then inputs the electric signal to a waveform shaping module, the digital quantity of the transmitting part is restored, the signal is converted to an analog audio signal through a digital-to-analog conversion module, and lastly, the analog audio signal is amplified through a power amplifier and drives a loudspeaker; and the modulation module and the demodulation module both adopt CD4046 phase-locked loops. According to the system, frequency modulation and demodulation is carried out conveniently and easily by employing the CD4046 phase-locked loops, and signal transmission is performed by employing the LED light, so that the confidentiality is good.

The invention discloses a standby power source automatic put-in switching full group test complete test method and a device thereof. The method comprises three test steps of: independently running section I and section II buses to test, running the section I and section II buses in parallel to test, and running the section I and section II buses in parallel to test. In the invention, various passive contact signals required for the test of a standby power source automatic put-in device can be generated, the device has simple structure and is convenient to operate, the working efficiency of the test can be improved, and the test of various functions can be completed. The defects of inaccurate testing, item missing, difficult matching and the like existing in the traditional auxiliary device are overcome, and the manual locking function and the joint switching function of the standby power source automatic put-in device can be tested conveniently. The test device has the advantages of small size, low cost and good interference resistance and is safe and reliable.

The invention discloses a collimating lens rear surface self-calibration co-light-path interferometer based on acoustic-optical heterodyning phase shifting. By means of heterodyning interference phase shifting of an acoustic-optical frequency shifter, moving parts of the interferometer are effectively avoided, measurement precision is further improved, interference prevention performance is good, research difficulty and cost can be reduced, and the interferometer is obviously superior to mechanical drive in measurement of a large-diameter surface shape; meanwhile, low-frequency difference heterodyning interference and high-speed surface area array continuous collection are achieved, obtained information is richer, accurate calculation of a phase position is facilitated, and influences of noise and other factors are overcome; additionally, point diffraction self-calibration light beams are additionally formed, and a reference mirror is calibrated in advance by means of point diffraction light during measurement. Precision requirements of the reference mirror can be reduced, measurement precision is improved and researching difficulty and cost of the interferometer are reduced.

The invention discloses a proton exchange membrane fuel cell humidity control method based on an auto-disturbance-rejection control method. The method comprises the following steps: step 1, establishing a PEMFC dynamic water management model which mainly comprises a cathode water balance model, an anode water balance model, a membrane hydration model and a voltage model; step 2, performing humidity control on the dynamic water management model of the fuel cell by means of the anti-interference performance and the inhibition performance of an auto-disturbance-rejection control technology, and adjusting the working humidity of the cell by controlling the air inlet humidity of a cathode; and step 3, carrying out simulation analysis by using Matlab and Simulink, and comparing the humidity control of the auto-disturbance-rejection control technology with the humidity control of the traditional PID control and fuzzy PID control method. Compared with a traditional PID controller and a fuzzy PID controller, an auto-disturbance-rejection controller improves the anti-interference and tracking control performance of the humidity of the proton exchange membrane fuel cell, has higher control precision, higher response speed and smaller overshoot, and can better meet the control requirement.

The invention discloses a high range resolution radar device capable of emitting a multifrequency carrier wave. The high range resolution radar device comprises an emitter, a receiver and a signal processing unit. The emitter comprises a multifrequency carrier wave generation module, a mixer, a local oscillator source, a band-pass filter, a coupler and an emitting antenna. The receiver comprises a reception antenna, a mixer, a low pass filter, a 90-degree phase shifter and ADC modules. The two ADC modules are connected to the signal processing unit. The signal output end of the signal processing unit is connected with the multifrequency carrier wave generation module. The high range resolution radar device can obtain non-fuzzy measurement distance which is the same with that of a frequency stepping radar with pulses, the number of which is far less than that of the frequency stepping radar, that is, a high-resolution range profile is obtained; and better anti-interference and anti-interception performance are achieved.