170results about How to "Reduce sampling error" patented technology

The invention discloses a voltage sampling circuit, which comprises a rectifying circuit, a voltage comparison circuit, a photoelectric coupler, a level switching circuit and a smooth filtering circuit, wherein the same-phase input end of the voltage comparison circuit is connected with the anode of the output end of the rectifying circuit through a resistor; an anode pin at the signal input end of the photoelectric coupler is connected with the signal output end of the voltage comparison circuit; a collector pin at the output end of the photoelectric coupler is connected with the signal input end of the level switching circuit; and the signal input end of the smooth filtering circuit is connected with the signal output end of the level switching circuit. According to the voltage sampling circuit, isolated sampling is realized through the photoelectric coupler, a control signal is isolated from a sampling signal, and the influence of an outer voltage power grid on the control signal is effectively avoided; and the voltage sampling circuit has the advantages of high control precision, small sampling error and the like.

Multispectral digitized images are provided by utilizing 2 or more spectral bands, providing images and information regarding a pigmented or other differentiated tissue sample at differing depths. The images are transformed to enhance morphological patterns characteristic of melanoma, such as the statistical properties of the pigment network, image texture or homogeneity, and the lesion reflectance, in order to provide information about lesion morphology at different depths. The images can also be processed and transformed to extract features such as blood volume saturation, oxygen saturation, or other characteristics that can be identified based on differential reflectance or absorption of light.

The invention discloses a sensor interface module, which comprises a closed-loop pre-amplifier and an analog to digital converter connected with the closed-loop pre-amplifier. An operational amplifier in the closed-loop pre-amplifier completely closes output current by closing a common grid tube and a matching tube in an output stage cascode structure, so that an additional large size proportion switch tube is prevented from being serially connected to an output stage current path, low power consumption is achieved, and the additional layout area is prevented from being increased; and a first capacitor array of a digital to analog conversion network in the analog to digital converter is a major decision part of a load capacitor of the pre-amplifier, and on the premise of ensuring the matching accuracy of an on-chip unit capacitor, the capacitor array is reused as the load capacitor, so that the closed-loop pre-amplifier can easily provide hundreds to thousands hertz of closed-loop bandwidth, and the sensor interface module can be applied to a biomedical instrument with different input signal bandwidth.

A broadcast text data sampling apparatus comprises an A/D converter for sampling a broadcast text signal supplied from the outside, with a sampling clock of a predetermined frequency, to convert the text signal into digital data; a binarization circuit for converting the digital data into a binary signal; a sampling pulse generation circuit for detecting the cycle of clock run-in of the broadcast text signal from the binary signal, obtaining a text data sampling interval value on the basis of the clock run-in cycle, sequentially calculating the positions of data in the binary signal, which data are positioned at intervals close to the sampling interval value, starting from a predetermined sampling start position, and generating a sampling pulse that designates the calculated data positions as data sampling positions; and a sampling circuit for sampling the text data from the binary signal on the basis of the sampling pulse. Therefore, this data sampling apparatus is able to perform sampling of text data from plural types of text broadcastings having different transmission clock frequencies.

The invention discloses a method for collecting underwater bubbles and a method for monitoring underwater bubble flux under hydrodynamic conditions. A counterweight pendant is connected with the open part of an inverted funnel of a collection device through a rope; a tubular connector is arranged at the top of the inverted funnel, and is connected with a gas inlet pipe of a gas collecting bottle through a gas hose; and a buoy is connected with the outer surface of the inverted funnel through a rope, ant the gas collecting bottle is fixed together with the buoy. The monitoring method comprises the steps of placing a bubble collecting device in a water body, floating the buoy on the water surface and tying on a water surface anchor rope, and fixing one end of the water surface anchor rope on the bank side and the other end of the water surface anchor rope on a channel buoy or a far bank; and collecting gas, and considering an inclination angle theta of the inverted funnel when the bubble release flux is calculated. The methods disclosed by the invention are convenient for operation, have low sampling errors, and are suitable for collecting underwater bubbles and monitoring underwater bubble flux under complex hydrodynamic conditions of natural water bodies (high water level fluctuation or distinct flow rate in water).

The invention discloses time synchronization and calibration methods and systems for data sampling. The method comprises the following steps that an actual clock frequency of an external clock sourceis divided by a preset target sampling rate to obtain an actual sampling interval, wherein the actual sampling interval comprises an integer part TIMER_INT and a decimal part TIMER_FRAG; fixed delay time is calculated according to a sum of an inherent time delay of a time synchronization signal and a time delay of calculating the actual sampling interval; a clock cycle number corresponding to thefixed delay time is obtained by multiplying the fixed delay time by the clock frequency; the clock cycle number is divided by the integer part of the sampling interval to obtain a quotient value and aremainder, and the remainder is denoted as FRAGO; the remainder is taken as an initial count value of first counting of a sampling counter in a current time synchronization period; and based on the initial count value, an AD sampler is controlled to carry out first sampling. According to the method, the calculation amount of post-calibration can be reduced.

The invention provides a full-automatic pesticide residue detecting method. An automatic mechanical arm is matched with an automatic sample feeder so as to realize that an enzyme solution, a color-developing agent and a substrate reagent are added according to the setting of a program; a controller and a control software module are used for controlling and detecting a mechanical arm assembly, an automatic sample feeder assembly, a rotary type colorimetric disk assembly and a photoelectric measurement module; the mechanical arm assembly comprises the mechanical arm which rotates around a horizontal arc-shaped rotating shaft and vertically moves up and down; a sample feeding needle of the automatic sample feeder assembly is arranged at the end part of the mechanical arm; the automatic sample feeder adds a reagent frame or different reagents on a reagent disc into a colorimetric cup located in the rotary type colorimetric disk assembly through the sample feeding needle; the automatic sample feeder assembly comprises a pipeline and a metering pump sample feeder controlled by a stepping motor; the sample feeder is connected with the sample feeding needle on the mechanical arm through the pipeline; a reagent of the reagent frame is quantitatively absorbed into the colorimetric cup through the movement of the mechanical arm; and the colorimetric cup is internally provided with a sample to be detected in advance and the photoelectric measurement module is used for detecting.

The invention discloses a sampling device of smoke and dust with automatically positioning detecting point, comprising a sampling mouth, a fixing unit, a Teflon axle sleeve, a sampling pipe of smoke and dust, a connecting piece of the sampling pipe, a stepping motor, a main engine of the sampling device of smoke and dust, a screw rod, and a rigid bearing unit, wherein, the fixing unit is connected with a sampling hole through a flange, the Teflon axle sleeve comprising two half circle cylinders are embedded in the center of the fixing unit, the sampling pipe of smoke and dust is slidingly arranged in the Teflon axle sleeve, one end of the sampling pipe of smoke and dust is provided with the sampling mouth, the connecting piece of the sampling pipe is fixed on the other end of the samplingpipe of smoke and dust, one end of the screw rod is arranged in a screw rod retainer, the other end of the screw rod is connected with the stepping motor through the rigid bearing unit arranged on the fixing unit, and the stepping motor is connected with the main engine of the sampling device of smoke and dust through signal lines and power lines. According to the invention, the whole process of sampling smoke and dust is accomplished automatically, so that the damage probability of operating personnel in operation process is reduced. The sampling mouth does not shake or incline when being used for positioning, the positioning is accurate and rapid, and the installation and dismounting of the sampling pipe are convenient.

The invention provides a sampling circuit, a switching power supply control circuit, a switching power supply and a sampling method. The sampling circuit comprises a demagnetization time acquisition circuit which is used for acquiring transformer demagnetization time TDS of the switching power supply in one switching period and transmitting the demagnetization time to a sampling control circuit; the sampling control circuit which is used for outputting predetermined clock pulse CLK according to the demagnetization time TDS so as to control sampling time of a sampling holding circuit, wherein pulse width W1 of the predetermined clock pulse CLK is less than the demagnetization time TDS; and the sampling holding circuit which is used for acquiring instant feedback voltage VF of the switching power supply at a predetermined time point under the control of the clock pulse CLK and holding feedback voltage VF so as to output an analog single with amplitude of VF, wherein the predetermined time point is the instant at which the switching power supply starts to work continuously for a time period of W1 in a switching period after one switching period. Feedback voltage in the switching power supply can be accurately acquired and constant voltage control precision of the switching power supply can be enhanced.

The invention discloses a device for stimulating nutrient absorption of a plant root system and a using method of the device. The device comprises a sampling pipe, a liquid-supplying system and a low-pressure system, wherein the sampling pipe is respectively connected with the liquid-supplying system and the low-pressure system; the sampling pipe comprises a sampling pipe body and an anion/cation exchanging membrane; a plurality of holes are arranged in the middle of the outer wall of the sampling pipe body; and a plurality of grooves are arranged between the holes on the outer wall of the sampling pipe body. The method for using the device comprises the steps of: burying the sampling pipe which is soaked in a sodium bicarbonate (NaHCO3) solution in the soil for 2 hours; taking the sampling pipe out and eluting the sampling pipe with hydrochloric acid (HCl) solution; and detecting the content of anionic and cationic nutrients in the eluent to evaluate the nutrients, which can be absorbed by the plant root system, in the soil. The system disclosed by the invention has the advantages of high accuracy, energy conservation, environment friendliness, simple operating steps and the like.

An apparatus that reduces sampling errors for data communicated between devices uses phase information acquired from a timing reference signal such as a strobe signal to align a data-sampling signal for sampling a data signal that was sent along with the timing reference signal. The data-sampling signal may be provided by adjustably delaying a clock signal according to the phase information acquired from the strobe signal. The data-sampling signal may also have an improved waveform compared to the timing reference signal, including a fifty percent duty cycle and sharp transitions. The phase information acquired from the timing reference signal may also be used for other purposes, such as aligning received data with a local clock domain, or transmitting data so that it arrives at a remote device in synchronism with a reference clock signal at the remote device.

The present invention discloses an active damping LCL filter, an active damping control device, an active damping control method and a control system. The active damping LCL filter comprises a network-side reactor, a bridge-side reactor, a branch capacitor, a first current transformer which is connected with the network side reactor and is used for detecting the three-phase current of a network side, and a second current transformer which is connected with the branch capacitor and is used for detecting the three-phase current of a branch.

The invention relates to a 500kV line relay protection device detection method and system. The method comprises the following steps: receiving a test order of to-be-detected relay protection devices and a test parameter and a standard fixed value of each preset logic protection test case, which are input by a user; acquiring sampling precision of the current to-be-detected relay protection device; generating a test sequence according to the logic protection test case and the test parameter corresponding to the current to-be-detected relay protection device when the sampling precision is greater than a preset precision threshold value; outputting the test sequence to the to-be-detected relay protection device, receiving an action message returned by the to-be-detected relay protection device, and generating detection result information in a preset format of the current to-be-detected relay protection device; generating a detection result of a next relay protection device according to the test order until the detection results of all the to-be-detected relay protection devices are generated. According to the method and the system, the detection accuracy can be effectively improved, the detection steps of testers can be saved, and the time required for detecting 500kV line relay protection devices is shortened.

The invention discloses a flow injection serially connected microelectrode electrochemical automatic method and device for simultaneous measurement of various electrolytes in a blood sample, and belongs to the field of clinical examination. A multifunctional valve is arranged in a 'sampling' position, carrier flow is converged with an acidity regulator under the power action of a pump, continuously flows through a mixing coil and an electrochemical flow-through detector, and generates base line electrode potential signals; a blood sample simultaneously enters a sampling quantification ring for automatic precision quantification; a valve is switched to the 'injection' position, a quantified 'blood sample plug' is injected into the carrier flow in a high repetition manner, is mixed with the acidity regulator and flows into the electrochemical flow-through detector, respective potential signals can be obtained, and blood sample results can be obtained through a computer. Meanwhile, the carrier flow follows the 'blood sample plug' to automatically and timely clean an electrode sensitive membrane surface and a system. The invention has the advantages of high automation degree, fast measuring speed, good repeatability and less consumption of samples, and eliminates the system plugging caused by blood samples and the cross contamination.

The invention provides a power converter for an inverter air conditioner. The power converter comprises a rectification circuit, an AC current collection circuit, an AC voltage collection circuit, a DC voltage collection circuit and a digital signal processor; the rectification circuit is controlled to carry out rectification on a three-phase AC power supply; the AC current collection circuit collects an input current signal of the three-phase AC power supply; the AC voltage collection circuit collects an input voltage signal of the three-phase AC power supply; the DC voltage collection circuit collects an output voltage signal after rectification by the rectification circuit; and the digital signal processor calculates an input current value and an input voltage value of the three-phase AC power supply and an output voltage value of the rectification circuit, carries out real-time feedback calculation to provide a control signal for the rectification circuit according to a feedback calculation result, so that the output voltage of the rectification circuit is stabled in a reference voltage value and the input current phase of the three-phase AC power supply follows the input voltage phase of the three-phase AC power supply. According to schemes of the invention, the power factor is high, the content of harmonic waves is low, and the complex degree and sampling errors of circuits are reduced.

The invention discloses a method for detecting real-time fluorescence quantitative RT-PCR of a single cell of foot and mouth disease virus genome RNA. The method utilizes a microinjection instrument to separate single cell of a foot and mouth disease virus; and after cracking, the fluorescence quantitative RT-PCR is used to carry out quantitative analysis. Visible operation of the microinjection instrument can rapidly and accurately separate out the single cell; and the microinjection instrument is combined with the high-sensitivity fluorescence quantitative RT-PCR to realize the detection of the quantity of the virus genome RNA in the single cell. The method can be used for researching virus copying on the level of the single cell and the relation between the single cell and a host cell and provides a new method for in-depth research of virus infection cytobiology. The technology for separating and cracking the cells has wide applicability, can be directly applied to the separating pretreatment of other kinds of virus-infected cells or normal cells in order that the method can be also used for the detection of other RNA virus genomes, the copying of normal cell genomes and the research on a transcribed molecular mechanism.

The invention aims to provide a millimeter wave radar angle automatic calibration system and method, and the system comprises a control center which is connected with a target simulation unit and a positioner controller; and a radar target simulator which comprises a target simulation unit, a radio frequency module, a turntable and a shielding environment. The method comprises steps: by setting radar, simulating target values and radar angle sampling scanning stepping and sampling time; setting a radar scanning range according to the radar simulation target value, and performing radar samplingand sending a result to the control center, calculating a difference value between a radar sampling actual angle value and a simulation target value, generating a calibration table and writing the calibration table into the to-be-measured radar as angle compensation of next radar sampling until the difference value is smaller than a preset error value, and completing calibration. Therefore, the automatic calibration of the radar angle test is realized, the angle error caused by installation and test can be effectively and quickly evaluated, and the performance test of the radar system can beaccurately and quickly carried out.

The invention discloses a power battery high-precision data synchronous collecting and real-time processing system and a method of power battery high-precision data synchronous collecting and real-time processing. The power battery high-precision data synchronous collecting and real-time processing system comprises a plurality of data collecting machine boxes. Each data collecting machine box comprises a monomer voltage collecting module, a monomer temperature collecting module and a data summarizing module. The number of the monomer voltage collecting module and the monomer temperature collecting module is in free combination. Collected corresponding data of a monomer battery is transmitted to the data summarizing module. The data summarizing module summarizes and caches all collected monomer battery data and uploads to an upper computer for storing. According to the power battery high-precision data synchronous collecting and real-time processing system, module design is adopted, the expandability is good, according to the needs, the number of sampling channels can be increased and decreased, the types of the sampling channels can be selected, and flexible system deploying is achieved.

The invention discloses a constant speed sampling method and sampling device of pulverized coal. The sampling method comprises the following steps: measuring flow velocity of the pulverized coal in apulverized coal pipeline and the pulverized coal pumped into a sampling pipe by adopting an electrostatic speed measurement way, and regulating gas extraction pressure in the sampling pipe to ensure that sampling is carried out when the flow velocity of the pulverized coal is equal to that of the other pulverized coal; the sampling device comprises a negative pressure gas extraction mechanism forpumping the pulverized coal in the pulverized coal pipeline into an inner cavity of the sampling pipe, a gas extraction pipe, a sampling collection mechanism, an electrostatic speed measurement mechanism, and a PID (Proportional-Integral-Differential) adjustment mechanism, wherein a gas extractor is mounted between the gas extraction pipe and the sampling pipe; the sampling collection mechanism isused for collecting the pulverized coal which enters into the sampling pipe; the electrostatic speed measurement mechanism is used for measuring the flow velocity of the pulverized coal in the pulverized coal pipeline and the pulverized coal pumped into the sampling pipe; the PID adjustment mechanism is used for adjusting gas extraction pressure in the sampling pipe so that the flow velocity of the pulverized coal in the pulverized coal pipeline is equal to the flow velocity of the pulverized coal in the sampling pipe. The constant speed sampling method disclosed by the invention is suitablefor sampling the pulverized coal in a primary air pipe, accurate constant speed sampling is realized, sampling errors can be reduced, and sampling of the pulverized coal has representativeness; the sampling device has a simple structure and is convenient to operate.

The invention relates to an in-hole seismic wave based advanced prediction method. The in-hole seismic wave based advanced prediction method comprises the following steps that 1, an in-hole excitation probe and a receiving probe are synchronously pushed to the bottom of a drill hole; 2, a hole is filled with water by using a water injection device and is sealed by using a rubber plug; 3, detection is performed by adopting in-hole exciting seismic waves and hole orifice exciting seismic waves; 4, data processing and interpretation and result output are performed. The in-hole seismic wave based advanced prediction method is a novel advanced prediction means, can visually and accurately detect structural anomaly within a certain range of the periphery of the hole diameter in virtue of the advantages of in-hole common-offset seismic records in a close-range mode, can obtain the rock mass characteristics of surrounding rocks in a close-range mode, can utilize the seismic records obtained through hole orifice common-source point excitation to obtain a more accurate longitudinal wave speed value, can decrease report omission phenomena during drilling, can obtain more accurate speed information compared with other advanced earthquake prediction methods and can more accurately provide advanced tunnel prediction results. The prediction results provide powerful references for construction decision makers to decide to increase the number of drill holes or not and adopt which excavation ways.

The invention discloses a WAQM-based optimal sampling method for network barrier-free detection. The method is implemented by means of performing the following steps on a computer system: grouping all webpages in a to-be-detected website according to different depths, and collecting the webpages with the same depth in a group; constructing an expectation model for website sampling errors; giving a sampling ratio r, and calculating a sampling webpage number of each layer by means of minimizing expectation of the sampling errors; randomly selecting a specified number of webpages from each layer according to the webpage sampling number of each layer so as to form a sampling specimen; performing machine detection and manual detection on each webpage in the specimen so as to obtain a barrier-free score of each webpage; estimating the barrier-free score of the whole website by utilization of the barrier-free scores of the sampled webpages according to a barrier-free measurement standard. The method disclosed by the invention has the advantages that the sampling error can be greatly lowered, and a barrier-free situation of the whole website can be better reflected by specimen webpages selected through a sampling algorithm.

The invention discloses an image display detection device for display module detection and a detection method thereof. The image display detection device is characterized by comprising a sealing mechanism provided with a port for inputting and outputting a display module to be detected, wherein a transmitting platform bearing the display module to be detected is arranged in the sealing mechanism, and a mobile detection image acquisition device is arranged on the transmitting platform and conducts detection image acquisition on the display module to be detected. According to the image display detection device for display module detection and the detection method of the device, the special image display detection device can be designed for detection in different scenarios by being matched with a production line detection test, normal temperature detection and high and low temperature detection can be performed, each time of detection is performed in a closed and shielded detection chamber, and outside interference is avoided, so that the detection is more accurate. In addition, the image display detection device can be very well integrated in a production line detection device, and the efficiency of automatic production line type detection can be remarkably improved.

The invention discloses a high-disturbance-rejection voltage acquisition circuit for a power battery cell and a high-disturbance-rejection voltage acquisition method for the power battery cell. The high-disturbance-rejection voltage acquisition circuit comprises a voltage acquisition controller and multiple cell voltage acquisition channels. Each cell voltage acquisition channel is connected witha voltage acquisition controller through a protection circuit, a differential amplification circuit, an absolute value circuit, a filter circuit, an ADC driving circuit and an ADC circuit connected which are connected in turn and an isolator; The voltage acquisition controller provides the sampling clock for the ADC circuit of the cell voltage acquisition circuit, controls start and stop of ADC sampling and reads the ADC conversion result. The voltage acquisition controller sends synchronous signals to each acquisition channel simultaneously to control synchronous acquisition of multiple acquisition channels by using the non-cyclic scanning mode.