664results about "Fluid-tightness measurement using electric means" patented technology

The apparatus for detecting the presence of a particular gas within a mixture of gases comprises first and second emitter means for emitting measurement and reference electromagnetic radiation beams respectively, which beams are activated in alternation, a measurement cell, a filter cell, first and second detector means for detecting electromagnetic radiation beams, a beam splitter, and acquisition and processing means for synchronously acquiring and processing the four signals <math-cwu id="MATH-US-00001"> <number>1< / number> U S 1 , U S 2 , U R 1 , U R 2 <mathematica-file id="MATHEMATICA-00001" file="US20020050567A1-20020502-M00001.NB" / > <image id="EMI-M00001" wi="216.027" he="11.02815" file="US20020050567A1-20020502-M00001.TIF" imf="TIFF" ti="MF" / > < / math-cwu> delivered by the first and second detector means in succession when the first and second emitter means are respectively activated so as to determine the absolute concentration of the gas to be detected on the basis of the ratio <math-cwu id="MATH-US-00002"> <number>2< / number> R = ( U S 1 x U R 2 ) / ( U S 2 x U R 1 ) <mathematica-file id="MATHEMATICA-00002" file="US20020050567A1-20020502-M00002.NB" / > <image id="EMI-M00002" wi="216.027" he="11.02815" file="US20020050567A1-20020502-M00002.TIF" imf="TIFF" ti="MF" / > < / math-cwu> between the four signals, in which <math-cwu id="MATH-US-00003"> <number>3< / number> U S 1 ⁢ ⁢ and ⁢ ⁢ U S 2 <mathematica-file id="MATHEMATICA-00003" file="US20020050567A1-20020502-M00003.NB" / > <image id="EMI-M00003" wi="216.027" he="11.02815" file="US20020050567A1-20020502-M00003.TIF" imf="TIFF" ti="MF" / > < / math-cwu> respectively represent the signals delivered by the first and second detector means when the first emitter means is activated, and <math-cwu id="MATH-US-00004"> <number>4< / number> U R 1 ⁢ ⁢ and ⁢ ⁢ U R 2 <mathematica-file id="MATHEMATICA-00004" file="US20020050567A1-20020502-M00004.NB" / > <image id="EMI-M00004" wi="216.027" he="11.02815" file="US20020050567A1-20020502-M00004.TIF" imf="TIFF" ti="MF" / > < / math-cwu> respectively represent the signals delivered by the first and second detector means when the second emitter means is activated.

A sensor unit for use in sensing conditions in a pipeline comprises an untethered a ball-shaped surround adapted to roll along the interior surface of a pipeline, and instrument package within the ball-shaped surround. The package contains at least one magnetometer or accelerometer. Preferably, three magnetometers, arranged orthogonally, are present. Other sensors can also be present as required, such as an acoustic sensor to detect leaks and a temperature or chemical sensor. Recording means record the data acquired by the magnetometer(s) or accelerometer and the sensors, and optionally also record a timing trace.

The invention relates to the monitoring and the diagnosis of operation states of a boiler, in particular to a system and a method for diagnosing leakage of a pressure-bearing pipe of a boiler. The system for diagnosing the leakage comprises a monitoring device, a storing device and a judging device; the monitoring device comprises a plurality of sensors which are arranged at each monitoring pointof a boiler unit and used for sensing and recoding operation parameters of the boiler unit in real time; the storing device is used for storing the operating parameters of the boiler unit in the normal working state; the judging device is communicated with the monitoring device and the storing device and can receive the real-time parameters from the monitoring device and judge whether leakage occurs to the pressure-bearing pipe of the boiler by comparing the real-time parameters with the parameters of the monitoring device. The invention is characterized in that when the real-time parameter from the monitoring device is higher than or is lower than that of the storing device in the normal working state and reaches a preset threshold value, the judging device judges that leakage occurs to the pressure-bearing pipe.

The present invention provides a robot which is suitable for travel through a pipeline. The inventive robot comprises at least one tracked drive means and at least one roller means that can swivel about an axis substantially normal to a rolling axis thereof, wherein said at least one tracked drive means and at least one roller means are provided with magnetic means for generating a magnetic adhesion force between the robot and an internal wall of the pipeline.

The invention provides a refrigerant leakage detecting method and system and an air conditioner. The method includes the steps that the first indoor air inlet temperature of an inlet of an indoor heat exchanger of the air conditioner and the first indoor heat exchanger temperature of the indoor heat exchanger are detected after a compressor of the air conditioner runs for a first set period of time; when the first difference between the first indoor air inlet temperature and the first indoor heat exchanger temperature is smaller than or equal to a first preset threshold, the second indoor air inlet temperature of the inlet of the indoor heat exchanger and the second indoor heat exchanger temperature of the indoor heat exchanger are detected after the compressor runs for a second preset period of time; when the second difference between the second indoor air inlet temperature and the second indoor heat exchanger temperature is smaller than or equal to the first preset threshold, whether variation of the second difference relative to the first difference is smaller than or equal to a second preset threshold or not is judged, and if yes, refrigerant leakage is judged to happen to the air conditioner. According to the technical scheme, refrigerant leakage of the air conditioner can be accurately detected in time.

A field device detects the presence of fluid in the terminal block area of the field device by generating an alternating current (AC) test current signal and measuring the amplitude of the resulting AC voltage signal. The field device includes a first terminal and a second terminal adapted for connection to a control room through a twisted-wire pair current loop. Impedance of the current loop is increased by the presence of fluid between the first terminal and the second terminal. By providing an AC test current signal to the control loop and measuring a resulting AC voltage magnitude, the impedance of the control loop can be determined. Increased impedance in the control loop indicates the presence of water in the terminal block.

The invention provides an efficient inspection method for inspecting a hermetically sealed package for pinholes, in which when a hermetically sealed package whose contents such as electrically conductive fluid or food are covered with an electrically insulating film is inspected for pinholes by using a high voltage, the inspection can be achieved with an extremely simple procedure while fully preventing occurrence of misoperations due to the atmosphere such as humidity during the inspection.In a hermetically sealed package in which contents 1 such as electrically conductive fluid are covered with an electrically insulating film 2, an electrical conductor 4 derived from a voltage output terminal of a DC high voltage power supply 6 is put into contact with or proximity to a side face portion 31 of the hermetically sealed package, by which the contents 1 in the hermetically sealed package 3 are electrified. Next, a lead wire 8 is connected to a connecting terminal 5a of an electrode 5 put into close contact with or opposed proximity to an inspection-object portion 3a of the package 3 where pinholes are most likely to occur, and the lead wire 8 is grounded. Then, a discharge current derived from the inspection-object portion 3a that flows only when a pinhole is present is detected by a discharge current detector 7, by which the presence or absence of a pinhole is detected depending on the presence or absence of the discharge current. In this procedure, the inspection can be made by placing the package on a support electrode derived from an AC high voltage power supply and electrifying the contents.

A sliding pipe plug for working on and testing pipes is presented. The sliding pipe plug includes a center portion and a gasket disposed about the central portion. When towed through the pipe, the sliding pipe plug maintains a substantial seal against water flowing through the pipe. In some embodiments, a flexible gasket can be utilized to allow for substantial sealing while the sliding pipe plug is traversing obstacles in the pipe. The sliding pipe plug according to the present invention can be utilized in pipes where conventional plugs are inconvenient. For example, in FELL testing a sewage line, a sliding pipe plug can be attached to a sonde cable and the testing can proceed without plugging and surcharging all of the section of pipe to be tested. In some embodiments, the sliding pipe plug includes a break-away section that allows the seal against water flowing through the pipe to be broken when the sliding pipe plug is pulled in a direction opposite the towing direction. In some embodiments, the sliding pipe plug includes a centering section that keeps the sliding pipe plug essentially in the center of the pipe.

The invention provides a leakage detection equipment which is equipped with a detection pipeline for detecting leakage of pipeline where liquid flows through and determines whether the liquid leaks from the pipeline based on voltage change of the detection pipeline. The leakage detection equipment is provided, which detects whether the detection pipeline comprising a plurality of leads leaks. The leakage detection equipment comprises the detection pipeline comprising a first to a third wire, wherein end ports of the first to third wires are connected electrically via a diode; a pipeline measuring unit for measuring a pipeline voltage in a special position point of each of the second and third wires after applying constant current to the first wire; and a microcomputer for detecting whether the pipeline leaks based on the pipeline voltage of each of the second and third wires.

In a method of detecting a leak in a water impermeable membrane applied on a roof substrate, an electrical potential is created between a conductive detector on top of the membrane and the roof substrate causing current to flow between the roof substrate and the conductive detector through moisture in any leak in the membrane. The membrane is attached to the roof support substrate by an intervening layer therebetween which can be a primer or an adhesive layer which is caused to be electrically conductive by the addition an electrically conductive material. This allows the conductor on the roof substrate to which the potential difference is applied to be attached onto the roof substrate and covered by the layer underneath the membrane.

An evaporated fuel purge system has a fuel tank, an adsorption filter and a purge control valve. The evaporated fuel purge system is pressurized and depressurized through a venting flow path by a pump, so that the state of leakage therefrom is thereby inspected. For this inspection, a motor unit for driving the pump which applies or reduces pressure, an in-vehicle battery and a voltage control circuit which controls a battery voltage to a predetermined voltage and supplies the motor unit with a current are provided. A switchover valve is integrated with the pump, the motor and the like into a single module.

The invention discloses a subway tunnel leakage monitoring and early warning system and a method. The system comprises a parallel electrical acquisition subsystem, a wifi gateway and a data monitoring subsystem. The parallel electrical acquisition subsystem is used for realizing acquisition of electrical data in a tunnel. An electrical big line is arranged on the side wall of the tunnel and is electrically connected with a parallel electrical prospecting apparatus host. An electrode is connected to the electrical big line through a plug-pull clip. An infinity B pole and a public comparison electrode N pole are electrically connected with the parallel electrical prospecting apparatus host. The parallel electrical prospecting apparatus host is fixedly installed on one side of the inner side of the tunnel and is powered by a power supply conversion device. The wifi gateway is used for achieving network linkage and instant messaging of the data monitoring subsystem and the parallel electrical acquisition subsystem. The data monitoring subsystem is used for storing, managing and intelligently processing and analyzing the electrical data, and achieving remote control on the parallel electrical acquisition subsystem and dynamic monitoring and active early warning for tunnel leakage water damages.

An inspection method for inspecting hermetically sealed packages for pinholes, in which when a hermetically sealed package whose contents such as electrically conductive fluid or powder or food are covered with an electrically insulating film is sandwiched between a pair of electrodes and inspected for pinholes with a high voltage applied thereto, occurrence of operation errors due to the atmosphere such as humidity during the inspection is fully prevented. A hermetically sealed package whose contents such as electrically conductive fluid are covered with an electrically insulating film is placed on a grounded support electrode with a side face portion of the hermetically sealed package in contact therewith, and a DC high voltage is applied between the support electrode and an electrode put into close contact with an inspection-object end portion of the hermetically sealed package where pinholes are most likely to occur. As a result, a capacitor formed between the contents 1 and the support electrode is electrically charged. Next, the electrode put into contact with the inspection-object end portion is grounded, and a discharge current from the inspection-object end portion that will flow only when a pinhole is present is detected with a discharge current detecting device, by which the presence or absence of pinholes is detected by the presence or absence of the discharge current.

The invention refers to a plate heat exchanger and a heat exchanger plate. The heat exchanger plate for a plate comprises a heat transfer area and an edge area, extending around the heat transfer area. The heat exchanger plate is a double wall plate formed by two adjoining plates compressed to be in contact with each other. The heat exchanger plate comprises a sensor which is configured to sense at least one parameter and to produce a signal depending on the parameter and that the sensor comprises a sensor probe that is provided between the adjoining plates.

The invention provides a refrigerant leak detection method, a refrigerant leak detection system and an air conditioner. The refrigerant leak detection method includes the steps of detecting actual operating power of the air conditioner under the current operating condition; obtaining theoretical operating power of the air conditioner under the current operating condition; judging that refrigerants of the air conditioner leak when the actual operating power is lower than the theoretical operating power. According to the technical scheme, whether the refrigerants in the air conditioner leak or not can be accurately detected.

The invention discloses a method for detecting the anti-seepage effect of an anti-seepage film, belonging to the anti-seepage detection field of anti-seepage films. The method comprises the following steps: adopting a high-pressure pulse power supply to apply electric potentials onto the upper side and the lower side of the anti-seepage film by current electrodes the positions of which are fixed; arranging a fixed electrode and a movable electrode in an upper detection region of the anti-seepage film, wherein the position of the fixed electrode is fixed; and distributing detection points at 1-5m *1-5m intervals by the movable electrode. In measurement, a high-pressure pulse is applied onto the current electrodes to measure an electric potential difference between the movable electrode and the fixed electrode until all measuring points are measured; and the distribution of the electric potential differences is distorted in loophole positions so as to judge the existence and the positions of leakage. The invention is a nondestructive measurement method and has high detection precision and simple and convenient operation.

The invention relates to the field of reservoir reinforcement, and specifically belongs to a seeping hidden trouble detection and directional processing method and detection equipment for an earth and rockfill dam. Aiming at a problem that most of earth and rockfill dams in current water conservancy engineering have a problem of seepage, the invention provides a directional processing method integrating seepage inspection and seepage blocking. The objectives of the invention lie in judging an electrical property abnormal area of a seeping channel according to the testing result of the resistivity of the earth and rockfill dam, interpreting the specific distribution of hidden troubles through combining the technical data of the operation of the reservoir, carrying out the reasonable guide of subsequent reinforcement operations, optimizing the grouting technology, avoiding the blindness of seeping blocking construction, remarkably improving the project benefit and winning social reputation. The method and equipment are advantageous in that the method and equipment introduce the latest parallel electrical method detection technology into the seepage detection of the earth and rockfill dam, carry out reasonable grouting according to a detection result, achieve the integration of hidden trouble inspection and processing, and achieve a purpose of quick directional processing.

A system for monitoring a subsea structure is presented. The system includes a sensor disposed on or about one or more tubular components of the subsea structure, where the one or more tubular components of the subsea structure include a riser, a flow-line, and a subsea umbilical. Moreover, the system includes a controller operatively coupled to the one or more tubular components of the subsea structure and configured to detect an anomaly in the one or more tubular components of the subsea structure. A method for monitoring the subsea structure is also presented.

A complete decreased mistake-proof high-reliability waterproofing system is revealed that integrates the waterproofing membrane, drain panel, and abrasion-protected filter fabric, using a factory-controlled process; furthermore, the system incorporates intrinsic devices for installation verification and leak-detection, and the potential for in situ mapping of the functional topography of the waterproofing installation over time.

The invention provides a system for seepage detection of an anti-seepage layer. The system includes a conductive grid and a monitoring detection device, the conductive grid is laid under the anti-seepage layer and includes a first lead group and a second lead group which are arranged according to preset rules, any lead in the first lead group and any lead in the second lead group intersect and have an intersection point, grid points in the conductive grid are formed in lead intersection positions, and two leads at each grid point are arranged in an insulated manner; and the monitoring detection device is used for providing a source signal for each loop formed by any lead in the first lead group and any lead in the second lead group, collecting effective electrical signals in each loop, and based on the electrical signals in each loop which are collected at different moments, determining whether seepage occurs in the anti-seepage layer at the intersection position of two leads in each loop and nearby. Through the detection system provided by the invention, whether seepage of the anti-seepage occurs can be effectively detected, seepage positions can be located, and a seepage pollution scope can be monitored.

A tire testing apparatus and method for detecting anomalies in the surface of a tire is disclosed. A high voltage probe having a conductive spring electrode is placed adjacent a portion of a tire surface such that the conductive spring electrode is compressed against the surface of the tire. Relative motion is imparted between the high voltage probe and the surface of the tire. An electrical discharge occurs between the high voltage probe and a reference electrode at the location of an anomaly on the surface of the tire. The apparatus and method are configured to determine a precise azimuthal and radial position on the tire of the electrostatic discharge. The conductive spring electrode can have a length sufficient to ensure contact with a given point on the tire surface during a charge cycle for the high voltage probe at increased tire surface speeds.

A geomembrane liner for a containment system including liner panels and connected by a seam at overlapped edges, with the top panel having a conductive lower surface which is non-conductive across the seam. Heat welding of the seams is accomplished by a welder having a heating unit with a projection which interrupts the conductive lower surface of the top panel before forming the seam. Such seams may be used separately or selectively with a lined containment system having a plurality of liner panels covering at least a portion of the containment system bottom. The liner panels have a conductive lower surface and overlap with adjacent panels, and conductive members underlie adjacent panels and contact the conductive lower surface of both adjacent panels to provide an electrical connection between the conductive lower surfaces of the adjacent panels.

A sensor network system that includes a sensor array having a plurality of sensor units that include a plurality of sensor elements, each sensor element configured to generate an electrical signal in response to a chemical environment in the vicinity of the sensor unit. The set of electrical signals generated by the sensor elements of the sensor unit represents a measured signature of the environment in the vicinity of the sensor unit. An analyzer is configured to extract the measured signatures of each sensor unit from sensor unit information signals and to detect a presence and concentration of one or more of the gases of interest based on the measured signatures.

The invention relates in particular to a method of covering a duct for transporting or storing a fluid in a device for detecting a leak of the fluid, the device comprising a layer of insulating fibrous material arranged to surround the duct and a layer of conductive material that extends against the layer of insulating material, the conductive material being essentially constituted by fibers of carbon or graphite, wherein the layer of insulating material is secured to the wall of the duct by strapping ties around said layer.

A first embodiment of a detection apparatus arranged to detect defects within a flexible pipe body comprises a signal generator, a receiver, a correlator and a processor. A second embodiment of a detection apparatus arranged to detect defects within a flexible pipe at least partially surrounded by seawater comprises an impedance monitor and a processor. Methods of detecting defects within a flexible pipe body, a pipeline apparatus and methods of forming pipeline apparatuses are also disclosed.

A tire defect tester and a method of operation are disclosed. In one aspect, the tire defect tester includes a first electrode arranged to direct energy toward a tire, and a second electrode arranged on an opposite side of the tire from the first electrode to receive energy passing through the tire from the first electrode. The tire defect tester further includes an energy sensor electrically connected to the second electrode and a fault indicator circuit responsive to the energy sensor and configured to indicate the presence of a flaw upon energy above a threshold level being sensed at the second electrode.