66 results about "Electrical capacitance meter" patented technology

Wireless circuitry is provided that includes a transformer having a primary coil and a secondary coil, a first group of switchable capacitors coupled to a first terminal of the primary coil, a second group of switchable capacitors coupled to a second terminal of the primary coil, and capacitance measurement circuitry selectively coupled to a center tap of the primary coil during a measurement mode. The capacitance measurement circuitry can include a current source, a current sink, a comparator, a voltage generator for providing one or more threshold / reference voltages to the comparator, a frequency measurement circuit, and a capacitance calculation circuit configured to compute a capacitance of the first and second groups of switchable capacitors.

The invention discloses a lithium battery solid electrolyte interface film forming quality evaluation method. The method comprises the following steps: in a lithium battery formation stage or a circulation process, applying an alternating current disturbance signal with an amplitude of 1-20mV, and collecting full-band electrochemical impedance spectroscopy data in real time; a relaxation time distribution method is adopted to decouple the electrochemical impedance spectrum of the intermediate frequency region; constructing an equivalent circuit model containing SEI film characteristics, and fitting the decoupled electrochemical impedance spectrum curve by the equivalent circuit model; the compactness index of the SEI film is calculated according to the SEI film resistance and the film capacitance, and whether the compactness of the SEI film reaches the standard or not is judged according to the compactness index; and calculating a lithium ion diffusion coefficient by combining the charge transfer resistance and the Warburg diffusion impedance, and evaluating the SEI membrane ion transmission efficiency. According to the invention, non-destructive monitoring is supported, quantitative evaluation of SEI membrane compactness, ionic conductivity and short circuit faults in the module can be realized, and the cycle life and safety of the lithium battery are improved.

The invention relates to an IGBT (Insulated Gate Bipolar Translator) device field-circuit joint simulation method considering stray capacitance electrothermal characteristics, which belongs to the technical field of power semiconductor device simulation modeling, and comprises the following steps: S1, constructing an IGBT circuit model in Simulink; s2, an IGBT electrothermal coupling multi-physical field model is constructed in the COMSOL; s3, defining the material attribute of each part, and defining the voltage and temperature sensitive characteristics of the parasitic capacitance of the IGBT chip; the influence of temperature change and voltage change on interelectrode capacitance is considered, and a capacitance calculation formula based on electrostatics is defined; s4, setting multiple physical fields and boundary conditions, selecting electric field and thermal field coupling modules, and setting electric field intensity and temperature initial boundary conditions; s5, field-circuit combination is carried out on the Simulink model and the COMSOL model; and S6, Simulink-COMSOL joint simulation is carried out, and the dynamic and static characteristics of the IGBT are obtained through the simulation model.

The invention discloses a method and a device for calculating distributed capacitance of an electromagnetic voltage transformer. The method comprises the following steps: constructing a capacitance parameter correlation constraint equation of the electromagnetic voltage transformer; opening a primary terminal of the electromagnetic voltage transformer, applying excitation of different frequencies to a secondary terminal of the electromagnetic voltage transformer, and obtaining iron core equivalent excitation impedance, open-circuit parallel resonant frequency and open-circuit series resonant frequency of the electromagnetic voltage transformer; performing short circuit on a primary terminal of the electromagnetic voltage transformer, applying excitation of different frequencies to a secondary terminal of the electromagnetic voltage transformer, and obtaining primary and secondary winding equivalent impedance and short circuit parallel resonant frequency of the electromagnetic voltage transformer; and substituting the iron core equivalent excitation impedance, the primary and secondary winding equivalent impedance, the open-circuit parallel resonant frequency, the open-circuit series resonant frequency and the short-circuit parallel resonant frequency into a capacitance parameter correlation constraint equation, and calculating the distributed capacitance of the electromagnetic capacitance transformer.

The invention relates to the field of electrochemical energy storage, in particular to a method for screening a high-rate-performance electrode and application thereof. The method comprises the following steps: (1) testing an electrode to obtain the double-electric-layer capacitance Cdl of the electrode; (2) testing the electrode to obtain an SCV curve graph of the electrode at different scanning speeds v; (3) calculating the area enclosed by the SCV curve graph, calculating the proportion Cdl% of the double-layer capacitance through the double-layer capacitance Cdl, and calculating the proportion Cp% of the pseudocapacitance through the SCV curve graphs with different scanning speeds v; and (4) screening to obtain an electrode with high pseudocapacitance proportion, namely the electrode with high rate performance. The method disclosed by the invention is short in time consumption, can optimize the current pseudocapacitance measurement method, separates the ratio of pseudocapacitance to double-layer capacitance, and can effectively screen electrode materials suitable for batteries or capacitors.

To provide an electrostatic capacitance measuring device capable of reducing floating capacitance generated at a tip part of a probe to measure electrostatic capacitance of a measurement target object at high accuracy.SOLUTION: An electrostatic capacitance measuring device 1 includes: a pair of probes 10 extending in a longitudinal direction and arranged in nearly parallel with each other; an electrostatic capacitance measuring instrument connected to the pair of probes 10; a planar shield plate 20 having a first main surface 20a and a second main surface 20b opposed to each other extending in a direction parallel to an extending direction of the pair of probes 10 and placed so that the first main surface 20a and the second main surface 20b are interposed between the pair of probes 10; and insulating layers 30 each provided in the first main surface 20a and the second main surface 20b of the shield plate 20. In the electrostatic capacitance measuring device 1, when viewed in a direction that the pair of probes 10 overlap with each other, the shield plate 20 is arranged at any position overlapping with the pair of probes 10.SELECTED DRAWING: Figure 1

The invention provides a test method and a test device for a capacitive touch sensing circuit, the capacitive touch sensing circuit comprises a dielectric layer, a touch sensing unit and a capacitive touch sensing electrode, the dielectric layer is mounted on the capacitive touch sensing electrode, and the method comprises the following steps: when no external electric field exists, the touch sensing unit is electrically connected with the dielectric layer; measuring a reference charge required by the capacitive touch sensing electrode to reach a preset voltage through the touch sensing unit; applying a preset external electric field to the capacitive touch sensing circuit through an external test circuit, and measuring a test charge required by the capacitive touch sensing electrode to reach a preset voltage through the touch sensing unit; according to the test charge, the reference charge and the preset voltage, calculating a to-be-tested induction capacitance of the capacitive touch induction circuit; in the same external electric field, standard induction capacitance of a preset capacitance touch control induction standard circuit is measured; and calculating a comparison deviation value according to the to-be-tested induction capacitor and the standard induction capacitor so as to judge whether the capacitive touch induction circuit passes the test or not.

The application discloses a lightning arrester phase-to-phase coupling capacitor determination method and device, medium and equipment, relates to the electrical measurement field, and mainly aims to improve the low accuracy of the existing lightning arrester phase-to-phase coupling capacitor determination. Including: obtaining the fundamental wave voltage effective value, the third harmonic voltage effective value, the fundamental wave current effective value and the third harmonic current effective value of each phase target lightning arrester; based on the fundamental wave voltage effective value, the third harmonic voltage effective value, the fundamental wave current effective value and the third harmonic current effective value, constructing a first capacitive current relationship of each phase target lightning arrester under the interference of the fundamental wave phase-to-phase capacitor and a second capacitive current relationship of each phase target lightning arrester under the interference of the third harmonic phase-to-phase capacitor; based on the phase-to-phase coupling capacitor calculation model, the fundamental wave voltage effective value, the third harmonic voltage effective value, the fundamental wave current effective value and the third harmonic current effective value are calculated to obtain the phase-to-phase coupling capacitor between each phase target lightning arrester.

The invention discloses a bus support capacitance calculation method and device, a medium and a product, and relates to the field of power electronics, and the method comprises the steps: firstly, calculating a neutral-point potential fluctuation allowable value according to a three-phase output voltage peak value and a load power factor angle of a three-level inverter; calculating the three-phase output current of the three-level inverter according to the three-phase output current peak value of the three-level inverter; capacitance current flowing through the subintervals is calculated; then calculating the charge cumulant of the bus capacitor in a charging period; and finally, calculating the minimum capacity of the bus capacitor according to the neutral-point potential fluctuation allowable value and the charge cumulant. The technical problem that the capacitance cost and the capacitance volume cannot be effectively reduced due to the fact that the existing method is low in calculation efficiency and difficult to accurately calculate the minimum capacitance capacity on the premise that the output waveform is not distorted is solved.

The invention discloses a capacitance setting method and device for a filter and a storage medium, and the method comprises the steps: calculating a working current flowing through a single-tuned filter under the condition that a harmonic wave is injected into the single-tuned filter; the single tuned filter comprises a capacitor and a reactor; calculating the rated capacity of the capacitor according to the working current; according to the rated capacity of the capacitor, calculating the rated voltage which can filter harmonic waves and is minimum in capacity for the capacitor; and setting the minimum capacity of the capacitor according to the rated voltage of the capacitor. According to the embodiment of the invention, the minimum capacity of the capacitor is calculated under the condition of keeping the harmonic filtering effect of the capacitor of the single-tuned filter, and the cost of the capacitor can be reduced, so that the cost of the single-tuned filter is reduced, and the cost is reduced on a large scale when a large number of low single-tuned filters are deployed in a power distribution network.

The invention relates to a charge capacity calculation device and method for an energy storage system. A method of calculating a charge capacity of an energy storage system according to one embodiment of the present invention. The method includes: a current application step of applying a predetermined current having a constant value to the energy storage system; a first voltage measurement step of measuring a voltage of the energy storage system while a predetermined current having a constant value is applied to the energy storage system; a second voltage measurement step of measuring a voltage of the energy storage system after blocking a predetermined current having a constant value applied to the energy storage system; and a resistance (R) and capacitance (C) calculation step for calculating the resistance (R) and capacitance (C) of the energy storage system on the basis of the voltage of the energy storage system measured in the first voltage measurement step, the voltage of the energy storage system measured in the second voltage measurement step, and a predetermined current having a constant value.

A method for performing guided self-examination of a subject's tissues is described. The method includes: positioning a handheld device comprising multiple electrodes and a certain amount of flexible material in general contact with a region of the subject's body; measuring the capacitance between two of the electrodes; calculating tissue parameters based on the capacitance; determining instructions for the subject in a controller based on the tissue parameters; and issuing instructions to the subject to guide the subject in manipulating the handheld device.

The invention provides a cable insulation dielectric constant extraction method, system and device, and belongs to the technical field of cable detection. The method comprises the steps of determining a cable additional capacitance value in a first preset frequency interval based on a cable length ratio corresponding to a to-be-detected cable group; and obtaining a first cable capacitance value and a second cable capacitance value, and determining an additional inductance value based on the cable additional capacitance value, the first cable inductance value and a preset impedance measurement equivalent relation. The preset impedance measurement equivalent relation is constructed by analyzing an impedance measurement result, the impedance measurement result is an impedance imaginary part obtained by measuring a preset cable based on a preset frequency signal, and the frequency of the preset frequency signal is in a second preset frequency interval; the lower bound of the second preset frequency interval is larger than the upper bound of the first preset frequency interval. And based on the additional inductance value, the second cable capacitance value, the second cable inductance value, the cable additional capacitance value and a preset coaxial capacitance calculation formula, determining a cable relative dielectric constant corresponding to the to-be-detected cable group.

Providing an electrostatic coordinate input device capable of accurately determining, depending on the distance from an operation body, whether an operation such as a contact operation, a proximity operation or other operations is being performed and capable of preventing erroneous operations, and a method for determining an operation in the electrostatic coordinate input device. An electrostatic coordinate input device includes an operation surface, a plurality of sensor electrodes arranged on a back side of the operation surface, a measuring circuit configured to measure a capacitance of each of the plurality of sensor electrodes, and a calculation unit configured to calculate a position of an operation body based on the plurality of capacitances measured by the measuring circuit.The calculation unit calculates a largest capacitance between the operation body and the sensor electrodes based on the plurality of capacitances, sets a non-showing determination threshold used to determine a non-showing operation that is not a showing operation of the operation body, and when the number of capacitances exceeding the non-showing determination threshold among the plurality of capacitances exceeds a determination number threshold, determines that the operation of the operation body is the non-showing operation.

To reduce the discontinuity of capacitance.SOLUTION: A capacitance sensor comprises: a sensor chip whose capacitance changes according to a physical quantity; a capacity detection unit 12 that converts output from the sensor chip into electric signals; a multiplexer 13 that performs switching so that two output signals from the capacity detection unit 12 are input to an AD converter 15 in a time-division manner; first and second capacity calculation units 160, 162 that calculate values of first and second capacitances on the basis of first and second output signals from the capacity detection unit 12 that are AD-converted by the AD converter 15; and a filter unit 161 that calculates the value of the first capacitance at the sampling timing of the AD converter 15 which is from when, of the first and second capacitances, the first capacitance having a longer sampling period in the AD converter 15 is calculated by the first capacity calculation unit 160, until when the first capacitance is calculated next.SELECTED DRAWING: Figure 1

A condition monitoring system is provided for a journal bearing arranged to support a rotary component installed in a rotary machine, which condition monitoring system includes a pair of electrical terminals arranged on either side of an oil-filled gap between the journal and the rotary component; a capacitance meter connected across the terminals and configured to output a measurement reading indicative of capacitance across the terminals during operation of the rotary machine; and an evaluation unit to receive readings from the capacitance meter and to determine the health of the journal bearing on the basis of the measurement readings. A method of determining the health of a journal bearing based on capacitance measurement readings across the oil-filled gap between a bearing journal and the supported rotary component is also provided.

Disclosed are a motor thermal protection device and an operation method thereof. The motor thermal protection device is powered by a power supply of a motor, and comprises: a capacitor timing circuit for timing after the motor is powered off; a power-off time determination unit for performing a reading operation of the output voltage of the capacitor timing circuit after the motor is powered on, and determining the power-off time from when the motor is powered off to when the motor is powered on according to the output voltage; and a heat accumulation calculation unit for calculating the remaining heat accumulation when the motor is powered on according to the power-off time and the heat accumulation when the motor is powered off.

The invention discloses a capacitance equivalent modeling method for lightning stroke response of a triangular connection side of a three-phase transformer, and the method comprises the steps: forming a triangular topology for a three-phase coupling network model based on the ground capacitance and turn-to-turn capacitance of a winding at the triangular connection side through node connection, precisely simulating the inter-phase coupling in a lightning stroke transient state, and obtaining the lightning stroke response of the triangular connection side; the method can effectively reflect the high-frequency capacitance characteristics of the triangular connection side of the three-phase transformer, determines the capacitance parameters of the three-phase coupling network model through the frequency domain impedance measurement and capacitance calculation mathematical model, improves the accuracy of the capacitance parameters, provides a more reliable basis for lightning stroke protection design, and improves the reliability of lightning stroke protection design. The technical problem that the prediction precision is insufficient in a high-frequency transient state due to the fact that existing transformer lightning stroke modeling neglects the inter-phase coupling effect in triangular connection of a three-phase transformer and does not fully consider the complex influence of a winding series-parallel connection structure on capacitance parameters is solved.

A system and method for determining a piezoelectric property of a piezoelectric material are disclosed. The system includes a voltage source configured to apply a first voltage across the piezoelectric material during a first time period. A mass sensor is operatively coupled to the material to measure an apparent mass thereof, and a capacitance meter is configured to measure a capacitance of the material during the same time period. A processor, communicatively coupled to the mass sensor and the capacitance meter, is configured to calculate a first value indicative of a piezoelectric property, such as a piezoelectric coefficient (d33 or d31), based at least in part on the measured apparent mass and the measured capacitance. By utilizing these concurrent measurements, the system can determine an effective thickness of the material under an applied electric field, circumventing prior art assumptions and enabling a more direct and physically accurate characterization.

The application relates to the field of integrated circuit design, and discloses a method, device and equipment for extracting a capacitance value, wherein the method comprises the following steps: determining a combined capacitance matched with each sidewall offset based on the relative position relationship between adjacent first and second metal layers in a pre-generated capacitance query table; wherein the sidewall offset of one side of the two adjacent metal layers represents the offset of a group of sidewalls of one metal layer on the side of another metal layer; calculating the surface capacitance component of the first and second metal layers based on a preset unit surface capacitance and the projection overlap width between the first and second metal layers; and calculating the capacitance value between the first and second metal layers according to the surface capacitance component and the combined capacitance matched with each sidewall offset. The technical scheme provided by the application can improve the extraction efficiency of the parasitic capacitance of the metal layer.

This utility model discloses a real-time clock circuit and a Beidou receiver, relating to the field of electronic circuit technology. The disclosed real-time clock circuit includes an energy storage module and a timing module. The energy storage module includes at least one electrolytic capacitor, which has a porous anode substrate structure and a dielectric constant higher than a preset dielectric constant. The timing module is connected to both the electrolytic capacitor and a power supply. This utility model utilizes the electrolytic capacitor to store energy when connected to a power supply, receiving the output voltage from the power supply and outputting the stored energy voltage to the timing module when the power supply is disconnected. The porous anode substrate structure of the electrolytic capacitor, with a dielectric constant higher than a preset dielectric constant, enables the storage of more energy in a short time, ensuring longer time recording even after the Beidou receiver is powered off, thus providing a reliable time reference for the long-term operation of the Beidou receiver.

The present disclosure relates to an apparatus for measuring an insertion depth of medical instruments inserted into a body and a method for measuring an insertion depth of medical instruments inserted into a body. The apparatus for measuring an insertion depth of medical instruments inserted into a body includes: a non-metallic protective container that is inserted into a body with a medical instrument disposed therein; a pair of main electrodes having a predetermined area and formed in a longitudinal direction while facing each other in the protective container; and a controller electrically connected to the pair of main electrodes, measuring capacitance that is induced by the pair of main electrodes, and calculating an insertion depth of the medical instrument inserted into a body on the basis of the measured capacitance.

This system provides a DC insulation resistance monitoring system whose measurement results are less susceptible to external noise. [Solution] A DC insulation resistance monitoring system for a high-voltage distribution system, comprising: a neutral point switch for a grounded instrument transformer; an insulating capacitor switched on and off by the neutral point switch; a DC power supply for charging the insulating capacitor; a switch for switching the connection between the DC power supply and the insulating capacitor; and a voltage measuring unit for the insulating capacitor. The voltage measuring unit measures and holds the drift voltage Vd of the insulating capacitor, measures and holds the peak voltage Vp of the insulating capacitor, measures and holds the capacitor voltage Vt after a certain time t has elapsed since the DC power supply was turned off after charging the insulating capacitor with the DC power supply, calculates the voltage discharge time constant of the insulating capacitor as (Vp-Vd) / (Vp-Vt)×t, and calculates the insulation resistance R as T / c using the capacitance C of the insulating capacitor.

The embodiment of the invention discloses an equivalent capacitance circuit, an equivalent capacitance circuit device, an equivalent capacitance calculation method, an equivalent capacitance calculation system and a Buck circuit, and belongs to the technical field of circuit impedance calculation, the equivalent capacitance circuit comprises an operational transconductance amplifier, a first resistor and a first capacitor, and the equivalent capacitance circuit is applied to the Buck circuit. And the equivalent capacitance circuit is connected between the first operational transconductance amplifier of the Buck circuit and the PWM comparator. According to the embodiment of the invention, the equivalent capacitance circuit is arranged in the Buck circuit, and the operational transconductance amplifier is reasonably arranged in the equivalent capacitance circuit, so that the problem that some circuits cannot adopt miller compensation in the related technology is solved, equivalent impedance is increased in the Buck circuit by designing one equivalent capacitance circuit, and the Buck circuit is improved. The equivalent capacitance circuit can be regarded as a capacitor with a large capacitance value.

The invention discloses a microstrip line design method based on high-frequency pure glue and a circuit board. The method comprises the following steps: acquiring the thickness of the high-frequency pure glue of a microstrip line and the initial line width of the microstrip line; and based on the thickness of the high-frequency pure glue of the microstrip line, the initial line width of the microstrip line and the non-fringing field capacitance of the microstrip line, calculating the line width of the fringing field at the tail end of the microstrip line. The circuit board comprises a top reference ground layer and a base material layer, and the top reference ground layer is provided with the microstrip designed and manufactured by adopting the design method. Capacitance is increased and impedance is adjusted by adjusting the line width of the tail end of the microstrip line, meanwhile, unit area stress of high-frequency pure glue of the microstrip line is dispersed, and collapse is reduced; impedance abrupt change in the microstrip line testing process is reduced, return loss is increased, and the influence of a horizontal probe on a transition position is remarkably reduced; through the circuit board structure and the microstrip line designed by adopting the design method, the dielectric constant and dielectric loss of the high-frequency pure glue can be directly obtained, the test of the single pure glue is realized, and the test result is not influenced by the electrical property of the substrate.

This invention relates to the field of electrical performance testing technology for nanoscale thin films, and in particular to a method for testing the dielectric constant and Q value of nanoscale thin films using a network analyzer. The method includes the following steps: S1: Preparing electrodes on the surface of the thin film to be tested, and forming a capacitor with the film; S2: Connecting the electrodes to the network analyzer using a probe station, and performing impedance matching on the circuit before connection; S3: Measuring the resonant frequency of the thin film under test at different frequencies and the S21 parameter at those resonant frequencies; S4: Calculating the capacitance and Q value of the thin film at different frequencies using the S parameters measured in S3; S5: Calculating the dielectric constant of the thin film at different frequencies using the capacitance obtained in S4. This invention has the advantage of simultaneously measuring the Q value of the thin film; and it can be tested at GHz frequencies, offering the advantage of high testing frequency. This invention achieves simultaneous testing of the dielectric constant and Q value of nanoscale thin film dielectrics, featuring accurate test results and high testing frequency.

Provided is an inspection device and an inspection method that easily correct a variation in electrostatic capacitance caused by a manufacturing variation in a substrate. The substrate inspection device is an inspection device that inspects a plurality of substrates on which wiring and reference wiring are formed, and includes: a measurement unit that measures electrostatic capacitance of the wiring and the reference wiring of each substrate as a measurement capacitance; an average capacitance calculation unit that calculates an average value of the measurement capacitance measured from the reference wiring that is designed to be the same wiring as the average capacitance; and a capacitance correction unit that, in a case where one of the plurality of substrates is taken as a target substrate, calculates a correction value of the measurement capacitance of a target wiring that is an inspection target of the target substrate, that is, a correction capacitance, and calculates the correction capacitance by multiplying a ratio of the average capacitance of the wiring of the target substrate to the measurement capacitance by the measurement capacitance of the target wiring.

Provided is a contact determination method in which a sheet-like electrode part 20, which is constituted by layering a first electrode 21 and a second electrode 22 with an insulator therebetween, is provided so as to cover an outer peripheral part of a steering wheel 10, and in which determination of contact of a driver with the steering wheel 10 is performed on the basis of an electrical signal detected from the electrode part 20. The contact determination method comprises: a detection step for detecting an electrostatic capacitance generated in the electrode part 20; a determination step for comparing a determination value calculated from the electrostatic capacitance detected in the detection step with a determination threshold to determine whether the steering wheel is in a hands-on state in which a hand of the driver is in contact with the steering wheel 10 or in a hands-off state in which the hand of the driver is not in contact with the steering wheel 10; and a setting step for setting the determination threshold on the basis of a determination initial value of the determination value in the hands-off state. In the setting step, when the determination value exceeds the determination threshold and then the determination value decreases and becomes a fixed value different from the determination initial value, the determination initial value is updated to the fixed value and the determination threshold is set on the basis of the updated determination initial value.

The invention provides a super capacitor internal resistance detection method. The method comprises the following steps: recording two times of trigger point accumulated charge and discharge capacity, two times of trigger point current values and two times of trigger point voltage values; when the difference value of the current values of the two triggering points exceeds a first threshold current, calculating the difference value of the accumulated charge and discharge capacities of the two triggering points, and calculating a voltage change value caused by the charge and discharge capacities of the two triggering points through a rated capacitor; calculating the internal resistance voltage of the super capacitor according to the obtained voltage change value caused by the charging and discharging capacities of the two triggering points and the voltage values of the two triggering points; and calculating the internal resistance of the super capacitor according to the obtained internal resistance voltage of the super capacitor and the two trigger current values. According to the super-capacitor internal resistance detection method provided by the invention, the internal resistance of the single super-capacitor is detected through the super-capacitor management system, and the influence of the voltage change of the single super-capacitor caused by the capacitance change of short-time large-current charging and discharging is considered, so that the detected internal resistance value of the super-capacitor is more accurate.

The application relates to a kind of gas pipeline evaluation method and device, the method comprises: current signal is emitted to gas pipeline by transmitter, and the current value at detection position is obtained;According to the current value of emission position and the current value of the detection position, the current attenuation coefficient of the gas pipeline is calculated;According to the current attenuation coefficient, current frequency, self-induction of the gas pipeline, longitudinal resistance of the gas pipeline and the capacitance between the gas pipeline and ground, the transverse resistance of the gas pipeline is calculated;According to the transverse resistance of the gas pipeline and the diameter of the gas pipeline, the insulation characteristic parameter of the gas pipeline is calculated;According to the size relation between the insulation characteristic parameter and preset threshold value, whether the gas pipeline leaks is determined.The application can judge whether the gas pipeline leaks, and the process does not involve human factors, so the accuracy of the judgment result is relatively high.