104 results about "Capacitance probe" patented technology

A capacitance probe for thin dielectric film characterization provides a highly sensitive capacitance measurement method and reduces the contact area needed to obtain such a measurement. Preferably, the capacitance probe is connected to a measurement system by a transmission line and comprises a center conductive tip and RLC components between the center conductor and the ground of the transmission line. When the probe tip is in contact with a sample, an MIS or MIM structure is formed, with the RLC components and the capacitance of the MIS or MIM structure forming a resonant circuit. By sending a driving signal to the probe and measuring the reflected signal from the probe through the transmission line, the resonant characteristic of the resonant circuit can be obtained. The capacitance of the MIS or MIM structure is obtainable from the resonant characteristics and the dielectric film thickness or other dielectric properties are also extractable.

The invention belongs to the testing field of discharge characteristics of solid insulating materials, relating to a system for automatically measuring charge distribution on the surface of a solid medium. The system comprises a stainless steel sealed chamber body, a high-voltage electrode, a grounding electrode, an electrostatic meter, a vacuum pump and a computer system thereof, wherein the stainless steel sealed chamber body is provided with a one-dimensional worktable and a two-dimensional worktable; a sample under test is fixed on the two-dimensional worktable; a electrostatic capacitanceprobe is arranged on the one-dimensional worktable; the electrostatic capacitance probe and the one-dimensional worktable are arranged in an extended chamber body of the stainless steel sealed chamber body towards the sample under test on the two-dimensional worktable; one end of the sample under test is connected with the high-voltage electrode, while the other end thereof is connected with thegrounding electrode; the one-dimensional worktable and the two-dimensional worktable are connected to an electronic control displacement table control box by a control line; the electrostatic capacitance probe is connected with the electrostatic meter; and the electronic control displacement table control box and the electrostatic meter are accessed to the computer. In the invention, the system for automatically measuring charge distribution on the surface of the solid medium can measure two-dimensional distribution of charge density on the surface of insulating materials.

The invention provides a two-phase flow parameter measurement method based on a dual-head capacitance probe and a device thereof, belonging to the field of multi-phase flow testing technology. The device comprises the dual-head capacitance probe, a probe driving mechanism, two capacitance measurement circuits, a fixed capacitor, a slab electrode and a computer system; wherein, the dual-head capacitance probe system consists of two independent single-point capacitance probes and can carry out one-dimensional motion on the section of a pipeline. The method comprises the steps as follows: each single-point capacitance probe is used for recognizing fluid property; when the fluid passing through the head of the probe is conducted, the circuit is connected and the capacitance measurement device outputs high level, otherwise the circuit is cut off and the capacitance measurement device outputs low level. The level signal can obtain local phase holdup; the measurement result of the method is not affected by the conductivity of the fluid and the spacing of the probes. The local phase holdup and the flowing speed can be obtained by processing the two single-point capacitance probe signals by the threshold method and the correlation method; the flowing pattern information can be obtained by combining with two-phase flow knowledge, thus achieving the recognition of flow pattern on line.

The detection system for phase content rate and interface in multiphase tube flow comprises: a single-wire capacitor and probe device, and a connected C/V conversion circuit to convert the capacitor value of probe into dc voltage and send to following device, and a signal process device to control last circuit and process, display and store data. This invention eliminates effect of fluid electric feature to detection result, and realizes real-time and on-line detection with well precision.

A probe assembly for capacitive testing electrical connections of a low profile component to a circuit assembly. The probe assembly is configured to reduce coupling of noise signals from the circuit assembly to the capacitive probe. The probe assembly includes a sensing member with a geometry that allows the probe to preferentially couple to test signals from the pins of a component under test rather than conductive structures on the circuit assembly, such as pads, and signal traces to which those pins are attached. The sensing member may be a vertical capacitive sense plate such that coupling is to an edge of the plate. The sensing member alternatively may be a horizontal capacitive sense plate with an active area of the probe surrounded by an isolation ring. Measurements made with such capacitive probes may provide test measurements that yield a reliable discrimination between a properly attached pin and an open pin.

The invention discloses a multiphase wet air flow and phase content online measurement method and device. The multiphase wet air flow and phase content online measurement device comprises a cylindrical V cone throttling device; a throttling cone body and a temperature sensor are arranged in an inner chamber of the V cone throttling device along the wet air flow direction in turn; the throttling cone body is connected with a retraction section differential pressure sensor and an expansion section differential pressure sensor through a pressure taking pipe; a pressure sensor, the retraction section differential pressure sensor, the expansion section differential pressure sensor and the temperature sensor are connected with a data processing system; a wet air flow inlet of the V cone throttling device is connected with a capacitance probe device through a flange. According to the multiphase wet air flow and phase content online measurement method and device, the wet gas passes through the V cone throttling device which is provided with the pressure sensor, the differential pressure sensors and the temperature sensor and statistical data are transmitted to the data processing system through the pressure sensor, the differential pressure sensors and the temperature sensor to be processed.

A water switch assembly for a nugget ice making assembly is provided. The ice making assembly includes a hollow auger rotatably mounted within a reservoir and configured for extruding ice. The water switch assembly includes a water supply pipe that extends vertically through the center of the ice making auger and reservoir. The water switch assembly is in fluid communication with a water inlet and includes a capacitance probe for measuring the water level in the reservoir. In this manner, the water switch assembly is configured to control the flow of water to the reservoir in response to the water level measured by the capacitance probe.

Embodiments of the disclosure may include a dispenser for dispensing a liquid. The dispenser may include a measurement chamber configured to receive the liquid, a temperature probe positioned within the measurement chamber, and a capacitance probe positioned within the measurement chamber. The capacitance probe may house the temperature probe. The dispenser may also include a first conduit fluidly coupled to the measurement chamber and configured to deliver the liquid out of the dispenser.

A capacitance based clearance probe has a partial sensor housing mounted on a surface and a sensor rod anchored in the partial sensor housing. The sensor rod extends into a sensor opening in the surface such that the partial sensor housing and the surface combine to operate as a complete sensor housing.

The invention relates to the liquid level measuring field, in particular to a digital capacitance type liquid level measuring sensor comprising a capacitance probe, a data acquisition circuit, a data receiving circuit and a display, wherein the output of the capacitance probe is connected with the data acquisition circuit, the output of the data receiving circuit is connected with the display, and the data acquisition circuit is connected with the data receiving circuit via CAN and LIN network. The invention overcomes the shortages of incorrect reading and limited service life of the prior art and has the advantages of accurate reading and long service life, oil mass display can be integrated with other parameters, such as speed per hour and temperature display.

A method of controlling the operation of a pressurised steam boiler (50) heated by a burner (20), which includes the steps of a) monitoring the level of water in the boiler (50), b) monitoring the pressure of steam in the boiler (50), c) monitoring the firing rate of the burner (20), and d) controlling the flow rate of water into the boiler (50) having regard to the signals resulting from a) and b) and, at least for some signal conditions, also having regard to signals resulting from c). The level of water is detected by a pair of capacitance probe assemblies (58A and 58B).

The present disclosure relates to a method for determining a water cut value of a composition comprising a hydrocarbon. In some embodiments, the disclosure relates to an apparatus for determining the water cut value of the composition that comprises one or more of a capacitance probe, a temperature probe, a salinity probe, and a computer.

The present invention relates to a method for determining a characteristic of a surface layer of a fuser element for fusing a marking material on a recording medium in a printing system. The printing system comprises a capacitive probe, which comprises a first electrode and a second electrode. The second electrode is arranged adjacent to the first electrode in order to form a capacitor. The first electrode and the second electrode are in operation both arranged adjacent to and opposing the surface layer of the fuser element. The method comprises the steps of performing a capacitive measurement on the surface layer by the first electrode and the second electrode of the capacitive probe and determining a characteristic of the surface layer based on the capacitive measurement.

An improved system for capacitive testing electrical connections in a low signal environment. The system includes features that increase sensitivity of a capacitive probe. One feature is a spacer positioned to allow the probe to be partially inserted into the component without contacting the pins. The spacer may be a collar on the probe that contacts the housing of the component, contacts the substrate of the circuit assembly, or both. In some other embodiments, the spacer may be a riser extending beyond the surface of the sense plate that contacts the component, a riser portion of the component, or a combination of both. The spacer improves sensitivity by establishing a small gap between a sense plate of the probe and pins under test without risk of damage to the pins.

A second feature is a guard plate of the probe with reduced capacitance to a sense plate of the probe. Reducing capacitance also increases the sensitivity of the probe.

Method and related device intended for rapid non-destructive testing of powdered materials with low electric conductivity such as cement and cement-based compositions through determination of their electrical properties. The invention involves an electromagnetic method, including an electronic circuit for generating an electric field in a capacitance probe that is inserted into the powder to be tested. Electrical properties of powdered materials are determined on the basis of a set of the values for a set of parameters including quality factor (Q-factor), capacitance, dissipation factor, and dielectric permeability of the material. These parameter values can be related to such characteristics as moisture content, particle size, and material composition. The method and device can indicate the differences between the samples with various quantities of unwanted components or reaction products, and the extent of sample ageing.

The invention provides a method for measuring the dryness of downhole steam in a thermal recovery horizontal well, which comprises the steps of: forming a capacitor by a two-phase mixed fluid of steam and water in a horizontal section in a mineshaft of the thermal recovery horizontal well, a capacitance sensor and a capacitance probe, and measuring the dryness of the steam in the horizontal section in the mineshaft of the thermal recovery horizontal well. The water phase in the steam and water two-phase mixed fluid, the capacitance sensor and the capacitance probe form into a circular capacitor, the water phase is taken as the negative electrode of the circular capacitor, the capacitance sensor and the capacitance probe are taken as the positive electrode of the circular capacitor, the capacitance sensor is used for measuring the voltage and commutating the liquid level height of the water phase, and the relationship between the liquid level height of the water phase and the voltage is as shown in the following formula so as to be capable obtaining the dryness of the steam in the horizontal section in the mineshaft of the thermal recovery horizontal well. The method has the characteristics of being extremely high in sensitivity to the water quantity, capable of measuring the downhole water content of the thermal recovery horizontal well, extremely high in sensitivity, small indryness measuring mean deviation which is less than 7%, convenient in application and operation and the like, thereby being widely applicable to the measurement technology of the dryness of the downhole steam in the oil thermal well.

The invention relates to a real-time measuring system for changes of an electric potential on the surface of an insulating material. The system comprises a pedestal, a probe and electrode fixing support, a slide rail scale, a prober holder, a supporting column, a high-voltage electrode, a ground electrode, a capacitance probe, a probe protective cover, an insulating material fixing groove, a static voltmeter, a data acquisition system, a data process system, and a display interface. The probe and electrode fixing support is fixed above the pedestal through the supporting column. A slide guide rail is arranged on the fixing support. The high-voltage electrode, the probe protective cover and the probe holder are vertically arranged on the fixing support in sequence. The upper end of the capacitance probe is connected to the static voltmeter. The ground electrode is fixed to the pedestal. The insulating material fixing groove is arranged on the pedestal. The static voltmeter, the data acquisition module, the data process system and the display interface are connected in sequence. The system can measure on-line in real time electric potentials on the surfaces of different solid insulating materials and the same kind of solid insulating materials at DC voltages as well as in a power-off condition after surface modification.

Mastitis in a milking animal is detected through sensing the capacitance effects in milk. Using frequencies of greater than 60 megahertz applied by a capacitance probe to milk as it streams through otherwise conventional milking equipment during milking, yields a reliably discernable shift in the phase angle, indicating the presence of mastitis.

A method of modifying the heat transfer coefficient profile of an electrostatic chuck by configuring the areal density of a mesa configuration of an insulating layer of the chuck is provided. A method of modifying the capacitance profile of an electrostatic chuck by adjustment or initial fabrication of the height of a mesa configuration of an insulating layer of the chuck is further provided. The heat transfer coefficient at a given site can be measured by use of a heat flux probe, whereas the capacitance at a given site can be measured by use of a capacitance probe. The probes are placed on the insulating surface of the chuck and may include a plurality of mesas in a single measurement. A plurality of measurements made across the chuck provide a heat transfer coefficient profile or a capacitance profile, from which a target mesa areal density and a target mesa height are determined. The target density and height are achieved mechanically; the target density by mechanically adjusting the areal density of existing mesas; and the target height by creating or deepening low areas surrounding planned or existing mesas, respectively. This can be accomplished using any of known techniques for controlled material removal such as laser machining or grit blast machining on an X-Y table.

The invention discloses a method of measuring the clearance between metallic bodies by using a capacitive sensor. The method adopts a plurality of preset metallic calibrated test pieces which are marked with the clearance between existing metallic bodies, and the capacitive sensor with a plain film type capacitance probe. The capacitive sensor comprises an insulated thin plain film and a metallic slice which is arranged on the lower end face of the thin plain film as a capacitance pile piece. The plain film type capacitance probe is inserted into the clearances of the metallic calibrated test pieces one after another to calibrate the one to one coincidence relation between the known clearances between metallic bodies and the test data of the capacitive sensor. In actual measurement, the calibrated coincidence relation and a linear computation mode are used to calculate the corresponding clearance value of actual measuring data, so that the measuring value of the clearances between metallic bodies is gained. Compared with the method adopting the prior technology, the method is characterized by quick detection speed and high detection precision.

This application relates to the field of the charge measurement technology, in particular to a surface charge measurement device of a basin type insulator model. In practical operation, surface charges are accumulated on the surface of the GIS basin insulator to cause distortion of a local electric field, so that the insulator surface flashover under VFTO is caused; and thus the interference on the surface charge measurement of the insulator is caused, so that the measurement error is increased. The surface charge measurement device comprises a charge measurement unit, a data processing unit and an energy supply unit. The charge measurement unit consists of a positive-voltage container module, a high-voltage electrode module, a to-be-tested basin type insulator module and a capacitor probe module; the data processing unit includes an electrometer module, an oscilloscope module and a display module and the electrometer module is connected with the capacitor probe module; and the energy supply unit includes a high-voltage power module. The surface charge measurement device has advantages of small measurement interference, small error, and high precision.

A system for dispensing cryogenic liquid to a use device includes a bulk storage tank providing LNG to a sump containing a meter submerged in LNG. A temperature probe is also submerged in the LNG. A dispensing line is positioned between the meter and dispensing hose and includes a dispensing valve. A drain line bypasses the dispensing valve and features a check valve so that LNG trapped in the hose after dispensing is returned to the sump due to pressurization by ambient heat. A capacitance probe is submerged in the LNG in the sump and provides a dielectric that is compared by a microprocessor with the dielectric for pure methane at the same temperature to determine the purity of the LNG. An approximate linear relation between density and dielectric may be used to determine density and mass flow for the LNG from the measured dielectric. Alternatively, a density compensation factor based upon the dielectrics may be calculated and applied to the density of pure methane to obtain the density and mass flow of the LNG. A further alternative embodiment substitutes a compensating meter for the capacitor and the equations for the resulting two meters may be solved to determine density and mass flow for the LNG.

A system for locating and determining the orientation of fasteners in hard disk drive spindle assemblies utilizes a sensor system that facilitates an automated rework process for the spindle assemblies. The screw locating system identifies the locations of the screws in a spindle and generates a signal for a screw driver system to align tool bits with the screws. The sensor is highly advantageous when reworking spindle motors with opaque labels that cover and/or block the fasteners. The present invention overcomes the drawbacks of prior art techniques by using a screw locating system that is based on a selected capacitance probe without requiring the use of timing features.

The invention relates to the technical field of integrated circuit detection and discloses a processor chip-oriented electrostatic discharge immunity test assembly and method so as to improve test fineness and convenience. The assembly comprises a non-capacitance probe and a capacitance probe which are respectively used for testing interference immunity of different pins of an IC chip, and a probeconnector, wherein one end of the probe connector is used for being connected with an output end of an electrostatic discharge generator, the other end of the probe connector is used for being detachably connected with the non-capacitance probe or the capacitance probe, a capacitor carried by the probe capacitor is a coupling capacitor which can be connected in series between the probe connectorand a single-ended signal pin of a tested high-speed DDR chip, the non-capacitance probe is used for connecting the probe connector with a pin of a differential signal of the high-speed DDR chip, andthe assembly further comprises a customized PCB test board which is provided with parallel coupling capacitors for the differential pins so as to be in butt joint with differential signal double-end pins of the tested high-speed DDR chip.

The invention relates to a novel on-line monitoring sensor for an iron content in oil and a monitoring method of the novel on-line monitoring sensor. The sensor comprises a detecting pipeline; the inner walls of pipelines at two ports of the detecting pipeline are respectively provided with a first capacitance probe and a second capacitance probe; the first capacitance probe and the second capacitance probe are hollow; the outer walls of the first capacitance probe and the second capacitance probe adapt to the inner wall of the detecting pipeline in shape; and an iron remover and a wiring terminal connected with the first capacitance probe and the second capacitance probe are arranged on the outer wall of the detecting pipeline between the first capacitance probe and the second capacitance probe. The monitoring method of the novel on-line monitoring sensor comprises the following step of: detecting the change of the dielectric constant of the oil before and after iron removal by adopting an electromagnetic iron removal technique and by utilizing the capacitance probes. The novel on-line monitoring sensor has the characteristics of simple structure, low cost, small power consumption and quick response, and the iron content in the running oil can be accurately detected in real time to master a wear condition in mechanical equipment, so as to determine an occasion for halt overhaul.