135results about How to "Guaranteed sampling accuracy" patented technology

The invention relates to a comprehensive automation integrated protecting method and a system which adopt an integrated IED to carry out automation functions such as protection, measurement and control, computation and the like of all bay units in a substation; state quantity, analog quantity and digital quantity which are output in interval by primary equipment on a process layer of the substation are respectively uploaded to the integrated IED through an ethernet switcher by a dual Ethernet (100mega/1000mega), and the protection and automation function of the substation are realized by calculating and processing the state quantity, analog quantity and digital quantity which are output in interval respectively by the integrated IED, therefore, a spacing layer and a substation layer of the substation are unified into one layer according to IEC61850 standard, and a plurality of IEDs are integrated into one integrated protecting IED, and two same integrated IEDs are provided for hot spare for improving the reliability. The comprehensive automation integrated protecting system leads the substation integrated protecting functions to share a uniform information platform, and communication network is used for replacing control cables, thus improving the reliability of the signal transmission, further improving automation and management level and reducing comprehensive construction cost.

The invention relates to an in-situ digitization method and a device of primary equipment of a substation; the in-situ digitalizer is arranged in each gap of the primary equipment on a spacing layer of the substation; the in-situ digitalizer respectively collects the status quantity such as a switch and a disconnecting link and the like in the same gap to convert into GOOSE format message, and respectively collects mutual inductor digital quantity and analog quantity information in the same gap to convert into sampling value transport format message, and the information processed by the in-situ digitization is sent out to a local area network in a process layer of the substation; the local area network in the process layer receives the GOOSE format message for converting into the open-closed operation control of the switch and the disconnecting link. The in-situ digitization method and the device thereof of the substation share the information in a uniform information platform, and the communication network is used for replacing control cables, thus being convenient for the design, construction, extension-construction of the substation, improving the reliability, further improving automation and management level and reducing comprehensive construction cost.

The invention relates to an analog-to-digital joint type data acquisition device, belonging to the technical field of data acquisition. The device of the invention comprises a first-stage analog amplifying and conditioning circuit, a parallel multiplex analog amplifying and conditioning circuit, an AD sampling module and a digital control module, wherein the parallel multiplex analog amplifying and conditioning circuit comprises an N-way amplifying and conditioning circuit formed by connecting two operational amplifiers in series; the output end of the first-stage analog amplifying and conditioning circuit is connected with N input ends of the parallel multiplex analog amplifying and conditioning circuit; N output ends of the parallel multiplex analog amplifying and conditioning circuit are respectively connected with N analog input ends of the AD sampling module; and the AD sampling module is connected with the digital control module through a control port. The acquisition device canintellectually realize automatic switchover of a measuring range according to the size of analog input signals, ensures the sampling accuracy, enlarges the dynamic range, does not need extra time forautomatic switchover of the measuring range, improves the sampling rate, and ensures the band width of a system.

The invention relates to a encoding method adaptable to various infrared control signals and includes the 5 steps of defining the feature codes, collecting the data, confirming the type of the data, perfecting the data of the feature codes and concluding the data code. The encoding method of the invention has the commonality and can adjust the encoding method of the infrared signal, recognize the modal type of the infrared encoding and increase the work efficiency.

The invention relates to a double-channel analog/digital (A/D) combined variable gain data acquisition device. The device comprises a primary amplifying and conditioning circuit, two parallel amplifying circuits, an A/D conversion module and a digital control module, wherein the output ends of the primary amplifying and conditioning circuit are separately connected with the input ends of the two parallel programmable amplifiers in a two-way parallel programmable amplifier circuit; the output ends of the two parallel programmable amplifiers are separately connected with the corresponding inputchannels of the A/D conversion module; the A/D conversion module is connected with the digital control module; and the digital control module reads the sampling value which is through A/D conversion and sends a control signal to control the A/D conversion process and change the gains of the programmable amplifiers. The acquisition device can be used to increase the dynamic range and span of measurement, ensure the sampling accuracy of weak signals and large-range signals and realize high-speed and high-accuracy data acquisition; and the method is more suitable for the detection of the analog of which size is unknown and variation range is wider.

The invention provides a space sampling method oriented to multisource marine environmental monitoring data. According to the space sampling method oriented to the multisource marine environmental monitoring data, firstly spatial position information of marine environmental monitoring data is extracted, and standarlization processing is carried out on the attribute information of the multisource marine environmental monitoring data; then, the spatial autocorrelation coefficients among all marine environmental monitoring stations are calculated by using a spatial variation function (Kriging), therefore, a traditional system sampling method is optimized, and a new space sampling method suitable for the multisource marine environmental monitoring data is provided; finally, the efficiency of the new space sampling method is checked through square deviation comparison and trend-surface analysis. According to the space sampling method oriented to the multisource marine environmental monitoring data, the special correlation and variability among the marine environmental monitoring data are fully taken into consideration. The method achieves the facts that sampling points are evenly distributed in examination areas and information redundancy can be reduced while the sampling precision can be guaranteed, the method can be applied to marine environmental monitoring work effectively, and theoretical foundation is provided for layout of key points of monitoring stations. The effectiveness of the method is verified by using the attribute information of certain sea area monitoring points as demonstration objects.

The invention relates to a puncture sampling device and an in-vitro detection analyzer. The puncture sampling device comprises a puncture mechanism, a sampling mechanism and a driving mechanism. The puncture mechanism comprises a puncture needle, a first through hole is formed in the puncture needle, the puncture needle is used for puncturing a container cover of A sample container, the sampling mechanism comprises a sampling needle, the sampling needle is used for penetrating through the first through hole and extending into the sample container to sample, the driving mechanism comprises a vertical driving mechanism, and the vertical driving mechanism can drive the puncture needle to move in the axial direction of the sample container to puncture the container cover and can drive the sampling needle to move in the axial direction of the sample container to penetrate through the first through hole to enter the sample container to sample. According to the puncture sampling device, the service life of the sampling needle can be prolonged, pollution to the sampling needle is reduced, and the sampling precision and the sampling success rate can be guaranteed.

The invention discloses a key needle tube type anti-theft anti-freezing sampling valve, and relates to an anti-theft anti-freezing sampling valve used for the mouth of an oil-water well in the oil extraction field. The key needle tube type anti-theft anti-freezing sampling valve comprises a valve body, a valve core, a driving mechanism and an anti-theft mechanism; the valve core is contained in an inner cavity of the valve body in form of capable of moving along the axial direction; one port of the inner cavity is used as an oil inlet and the other port is provided with a gland; a sampling channel interconnected with the inner cavity is arranged on the valve body; the valve core, under the drive of the driving mechanism, controls the opening and closing of the sampling channel by the reciprocating motion; the end of the valve core facing the oil inlet can extends out of the oil inlet. By adopting the key needle tube type anti-theft anti-freezing sampling valve, the blind section in front of the valve in the prior art is eliminated, and therefore, the crude oil is prevented from being accumulated and stored in the valve body, the stored oil is prevented from freezing, meanwhile, the exhausting is not required, in this way, the labor intensity of the operators in the filed is reduced, the environmental protection is helped, the sampling veracity is ensured, and further, the accidents of crude oil leakage and environment pollution caused by the fact that the sampling valve is opened by an irrelevant person are effectively prevented.

The invention relates to a wireless sensor network monitoring system based on an endocrine regulation and control mechanism. Wireless sensor network nodes monitor target information. In the monitoring process of the nodes, hormone information is secreted, the nodes are controlled to be in a work or dormant state and sampling frequency of the nodes is dynamically regulated. When the nodes monitor that the target changes slowly, inhibition hormone is transmitted and sampling frequency of the nodes is reduced; and when the target changes quickly, tropic hormone is transmitted and sampling frequency of the nodes is enhanced. When hormone concentration change of the nodes is abnormal, an abnormal node processing mechanism is triggered. If the nodes are not anchor nodes, position-unknown abnormal node coarse positioning is realized by a convex programming algorithm, then positioning correction is performed by using anchor node hormone information to acquire position information of the abnormal node, and finally the position information and monitoring data of the abnormal node are transmitted. Sampling effectiveness and accuracy can be guaranteed and the life cycle of the network can be effectively prolonged simultaneously.

The invention discloses a high-precision current sampling system for online monitoring of a CVT. The system comprises a signal conversion unit, a data acquisition and processing unit and an industrialcomputer; the signal conversion unit comprises a plurality of micro-core-penetrating type current transformers for realizing non-invasive sampling; the data acquisition and processing unit is used for time service through a GPS module, analyzing and processing the sampling data by adopting a fast fourier transform interpolation algorithm, and uploading the analysis result to the industrial computer; and the industrial computer receives the data sent by the data acquisition and processing unit and bears the tasks of data storage and display. Compared with an existing acquisition system, the system transfers the data processing task to a lower computer, so that the burden of the upper computer is reduced while the measuring precision is guaranteed.

The invention discloses a constant current charger circuit, solving the problems of charging current precision and circuit stability caused by offset voltage in the process of lithium battery charging. The constant current charger circuit is characterized in that a sampling unit (2) samples a charging unit (1) to obtain a sampling current signal IBFETH; a switched capacitor circuit unit (3), a voltage compensation unit (4) and a signal conversion unit (5) form negative feedback to ensure the sampling precision. The sampling current signal IBFETH is converted into a sampling voltage by the signal conversion unit (5) and output to a charging current adjustment unit (6). The charging current adjustment unit (6) obtains the charging current adjusting signal according to the sampling voltage and feeds back the obtained signal to the charging unit (1) for controlling and adjusting the magnitude of the constant current charging current. A digital control unit (7) is used to switch the working state of the switched capacitor circuit unit (3) to eliminate the influence of the offset voltage of an operational amplifier. The constant current charger circuit makes the charging current maintain accurate and stable under different offset voltages, and can be used for a lithium battery charger.

The invention discloses a sliding water sample collector and relates to the field of water sample collection equipment. The sliding water sample collector comprises a lifting rope, a pressure sensor, a shell, an upper cover, a supporting rod, a pull rope and a base plug, wherein the upper cover is rotationally connected onto an upper end face of the shell; the base plug is connected to a lower end face of the shell in a sealed manner; a groove I is formed in the upper cover; an O-shaped ring I is arranged on the upper end face of the shell; the supporting rod penetrates through the shell; the upper end of the supporting rod is fixedly connected with the lifting rope, and the lower end of the supporting rod is fixedly connected to the base plug; the pressure sensor is arranged at a fixed joint of the supporting rod and the lifting rope; a lug I is arranged on the lower end face of the upper cover; a lug II is arranged on the inner wall of the shell; a lug III is arranged at a part, which is positioned in a cavity of the shell, of the supporting rod; and one end of the pull rope is fixedly connected to the lug I, and the other end of the pull rope penetrates through the lug II and is fixedly connected to the supporting rod through the lug III. According to the sliding water sample collector disclosed by the invention, the water sample collection depth is accurately positioned, and smooth water flow exchange in the lowering process is ensured, so that the water sample collection accuracy is ensured. Meanwhile, the air-tightness of the collector in the lifting process can be ensured.

A dynamic knee point detection circuit comprises a first feedback resistor, a second feedback resistor, a leakage inductance leading edge blanking module, a ripple amplification module, a first comparator, a second comparator, an NOR gate and a dynamic leading edge blanking module, and the first feedback resistor and the second feedback resistor are used for obtaining feedback voltage of voltage of dotted terminals on an auxiliary winding in a flyback converter. The leakage inductance leading edge blanking module is used for shielding the feedback voltage when the secondary side of the flybackconverter just starts to be conducted to generate resonance. The ripple amplification module is used for amplifying the feedback voltage within a transmission band range and then outputting the feedback voltage. The first comparator, the second comparator and the NOR gate are used for judging whether the feedback voltage exceeds a set threshold value or not. The dynamic leading edge blanking module is used for obtaining the arrival time of the knee point voltage and the knee point voltage value. The circuit is suitable for the resonant frequency in a wider range, has higher sampling precision, and cannot generate the problems of false triggering and the like.

The invention discloses an all-dimensional cleaning device for on-line monitoring water quality sensors in aquaculture. An installation rack drive motor is connected to the center of an installation rack through an output shaft of the installation rack drive motor and is connected to a controller; the water quality sensors of an even number are installed above the installation rack in the peripheral direction with the axis of the output shaft of the installation rack drive motor as the center; a side surface brush driven by a side surface brush drive motor and a bottom surface brush driven by a bottom surface brush drive motor are symmetrically installed at the positions, on the left side and the right side of the output shaft of the installation rack drive motor, of the upper part of the installation rack. According to the device, the installation rack rotates so that the side surface brush and the bottom surface brush can sequentially clean the multiple sensors, the sampling accuracy can be guaranteed, and the utilization rate of the cleaning device is increased; the controller controls automatic switching between water quality monitoring and sensor cleaning, manual operation is reduced, and the system work efficiency is improved.

The invention discloses an aquaculture stratified water sample rapid collection device and method. The device comprises a sampling rod, a plurality of syringe samplers fixed to the side face of the sampling rod, a first positioning plate, a level bubble and a second positioning plate, wherein the first positioning plate and the level bubble are arranged at the top of the sampling rod and the second positioning plate is arranged at the bottom of the sampling rod. The length of the sampling rod is adjustable, the first positioning plate and the second positioning plate are perpendicular to the sampling rod, and a pond bottom fixator is arranged at the bottom of the second positioning plate. According to the method, two depth calculation methods with the water surface as the benchmark and thepond bottom as the benchmark can be supported, and the sampling precision, efficiency and layering precision can be guaranteed while the two benchmarks are considered.

The invention discloses a creeping-type water quality sampling device for water quality detection and a water quality sampling method. The creeping-type water quality sampling device comprises a shellbody, an adjustable water quality sampling device and a gas driving device, wherein the adjustable water quality sampling device and the gas driving device are both installed on the shell body, the adjustable water quality sampling device is used for sampling water, and the gas driving device is used for driving the whole creeping-type water quality sampling device to creep; the adjustable waterquality sampling device comprises a turntable group, a submersible pump, a first T-shaped three-way valve, a first interface guide pipe, a first metal snakelike hose, a first hard guide pipe, a secondhard guide pipe, a second metal snakelike hose, a second interface guide pipe and a sample water storage disc; and the gas driving device comprises gas distribution plates arranged in side bins, telescopic gas supply devices communicated with the side bins located at the top part of the shell body, and gas guide pipes communicating the adjacent side bins. The creeping-type water quality samplingdevice has the advantages of wide water quality sampling range, high flexibility, adjustable sampling water quantity and accurate sampling.

The invention provides an electronic transformer calibrator traceability method and system. The method comprises the following steps: a digital multimeter collects analog signals and converts the analog signals into a digital message; an upper computer carries out virtual reconstruction on the digital messages and then carries out error information superposition to form a reconstructed message; a message controller carries out timing control according to the reconstructed message; a tested electronic transformer calibrator collects the analog signals and the reconstructed message sent by the message controller and generates error information; and a comparison is made between the error information generated by the tested electronic transformer calibrator and the error information superposed by the upper computer to obtain test errors. The sample data of the digital multimeter is subjected to virtual reconstruction to enable the output digital message to be same with the message output by an actual electronic transformer merging unit, and by comparing the error information generated by the tested electronic transformer calibrator and the error information superposed by the upper computer, the test errorsof the tested electronic transformer calibrator is obtained; and therefore, full traceability work is finished.

The invention discloses a temperature measurement system and method. The system comprises a thermocouple sampling module, a thermal resistance sampling module, a measurement device and a temperature sensor. The thermocouple sampling module is used for collecting a thermocouple voltage signal of detected equipment. The thermal resistance sampling module is used for collecting a thermal resistance voltage signal of a cold end of the thermocouple sampling module. The temperature sensor is used for collecting the internal cold end temperature signal of the measurement device. The measurement device is used for selecting a cold end temperature compensation mode, and calculates the temperature of the detected equipment in the selected cold end temperature compensation mode. The invention also provides a temperature measurement method. The remote sampling employs the external compensation for guaranteeing the sampling precision. The short-distance sampling employs the internal compensation, thereby releasing one more sampling channel.

The invention discloses a farmland landscape small-scale ground object classification method and system. The classification method comprises the steps of obtaining an unmanned aerial vehicle image ofa to-be-classified region; Performing mask extraction on the unmanned aerial vehicle image by utilizing the vegetation index, and shielding ground objects irrelevant to the cultivated land type and the non-cultivated vegetation type to obtain a preliminary to-be-classified image; Dividing the preliminary to-be-classified image into a plurality of regions according to a division scale by using software with an image division function, so that the regions have different properties, and pixels in the same region have the same properties, thereby obtaining a plurality of micro-images; And extracting a feature vector of each micro-image, inputting the value of the feature vector into the trained random forest model for classification, and determining the category of each micro-image to be classified in the region to be classified. According to the classification method and system, recognition and classification of small-scale ground objects can be achieved for high-resolution images.

The invention discloses a novel feeder line distance protection method for high speed trains. The method includes the following steps that: step A, a feeder line distance protection action region is obtained: the feeder line distance protection action region is obtained according to a high-speed train power supply system; step B, a lockout distance protection region is obtained: a minimum overload impedance setting angle phi1, a maximum overload impedance setting angle phi2 and an overload lockout value Zr are found out in the feeder line distance protection action region; and step C, lockout distance protection is performed: a current impedance value Z and a current impedance angle value phi are obtained, lockout distance protection pre-judgment is performed, if the current impedance value Z and the current impedance angle value phi fall in the feeder line distance protection action region, the method shifts to lockout distance protection determination, if the current impedance value Z and the current impedance angle value phi fall in the lockout distance protection region, lockout distance protection is performed, and at this moment, distance protection does not act.

The invention discloses a variable parameter type deepwater net cage mooring force collector. The variable parameter type deepwater net cage mooring force collector is mainly composed of an analog quantity force sensor, a signal conditioning device, a sampling holder, an A/D converter, a microprocessor, a data storage unit, a keyboard and a power supply device, wherein the values of sampling frequency and low-pass filtering cut-off frequency are small, and the sampling frequency and the low-pass filtering cut-off frequency can be controlled by a software program to change simultaneously so that the proportional relation between the sampling frequency and the low-pass filtering cut-off frequency can meet requirements on any conditions, and frequency mixing and distortion of mooring force sampling data can be avoided; the A/D converter has a large number of bits, thereby being high in conversion accuracy. The variable parameter type deepwater net cage mooring force collector achieves distortionless measurement of mooring force when signal frequency components are not completely certain; on the premise of guaranteeing the sampling accuracy, researchers can set mooring force sampling parameters flexibly according to different wave conditions and the requirements of different research targets; besides, commands are input in two modes, namely the keyboard mode and the wireless transmission mode, so the requirements for field collection and remote collection can be met at the same time.

The invention discloses a nuclear power plant generator injection type stator grounding protection dynamic test method and device. With the method and device adopted, the technical problem of high risk of an existing conventional dynamic test can be solved. The dynamic test method includes the following steps that: S1, a stator grounding protection device exits under control so as to be not used; S2, a resistance value-adjustable test resistor is connected between the neutral point of the stator winding of a generator and ground before excitation boosting when the generator is a no-load state, and the grounding of the stator winding is simulated; S3, the stator grounding protection device is put into use under control, and excitation boosting achieves preset voltage under control, and maintains stable operation; and S4, measuring resistor sampling testing is carried out through the stator grounding protection device, and the protection parameters of the stator grounding protection device can be adjusted based on sampling testing results, and therefore, sampling accuracy can assuredly satisfy preset requirements, and detection and correction of the protective performance of the stator grounding protection device can be realized. With the method and device adopted, test risks such as electric shock of testers, false grounding of operating equipment and inaccurate measurement of the test resistor can be avoided.