Abstract: A tool measures relative concentricity deviations in a confined space between two circumferential elements, such as a turbine rotor and a turbine diaphragm. The tool includes a housing, and a sensor coupled with the housing that measures a distance from the housing to one of the two circumferential elements. An axial spring plunger is connected to the housing, and a radial spring plunger is connected to the housing and arranged orthogonal to the axial spring plunger. The tool also includes a sliding or rolling surface on a side of the housing opposite from one of the axial spring plunger and the radial spring plunger.

Abstract: A displacement detection apparatus capable of stably and accurately detecting the amount of displacement. The length of a polarization maintaining fiber for transmitting the light from a light source to a displacement detector is set not to be equal to a length obtained by dividing, by the wavelength of the light source, a product of an even integral multiple of a length, which is obtained by multiplying twice the length of a resonator by the refractive index of the resonator, and a beat length obtained by a difference between the propagation constants of two polarization modes. Alternatively, the length of the polarization maintaining fiber is set to be larger than a length, which is obtained by dividing, by the wavelength of the light source, a product of a coherence length and a beat length obtained from a difference between the propagation constants of two polarization modes.

Abstract: Method and system is described to enhance operations for managing the hydrocarbon release. The system utilizes an airborne detection device equipped with measurement components and communication components. The system may utilize various measurement techniques to determine the thickness of the oil slick. This remote detection method may provide a dedicated airborne detection device for each response vessel and that can identify the location and thickness of the oil slick.

Abstract: A method for determining if a wire guide roller having a plurality of V-shaped grooves, each having a copper line thereon, arranged column-by-column on a periphery direction thereof is failed after slicing a plurality of wafers is disclosed. Based on the disclosed technical means, the efficacy may be achieved that a damage situation may be automatically examined and notified to maintain a yield in the slicing process in an online high speed environment.

Abstract: Various embodiments of tools with associated optical measurement devices are described. An apparatus may include a tool to be applied to a workpiece, an optical measurement device in a feed path of the tool, and a controller. The optical measurement device may generate displacement measurements indicative of displacement of the workpiece as the workpiece traverses the feed path toward the tool. The controller may generate a measurement of the workpiece based on the plurality of displacement measurements.

Abstract: There is provided a bolt sensor which detects a fastened state of a bolt. The bolt sensor includes a sensor body including a through hole into which a shaft of the bolt is to be inserted, a light guide extending along an outer periphery of the sensor body, and a light source configured to emit light to the light guide based on output of the sensor body.

Abstract: A method for measuring a three-dimensional shape of an inner surface of a vitreous silica crucible which enables the measurement of the three-dimensional shape of the inner surface of the crucible without contaminating the inner surface of the crucible, is provided. According to the present invention, a method for measuring a three-dimensional shape of a vitreous silica crucible, including a fogging step to form a fog onto an inner surface of the vitreous silica crucible, a three-dimensional shape measuring step to measure a three-dimensional shape of the inner surface, by measuring a reflected light from the inner surface irradiated with light, is provided.

Abstract: To obtain a high-resolution image on a detection of a contour of an object, an image detection system for detecting an object is provided which comprises a defined detection zone in which the object moved through the detection zone is detectable; at least two lighting units for lighting the detection zone with a respective light beam; and at least two light reception units for receiving light reflected at the object, wherein one respective lighting unit is associated with a light reception unit, and wherein the lighting units each transmit their light beams at a defined light wavelength and the light reception units are configured to receive a respective light wavelength of the reflected light associated with them, wherein the one light reception unit receives a different light wavelength than the other light reception unit.

Abstract: An optical shape sensing system and method with at least two optical fibers (OSF1, OSF2) both comprising optical shape sensing elements. A processor (P) is arranged to register a coordinate system indicative of a position of one of the optical fibers (OSF1) in space, and to register a position (R2) of the other optical fiber (OSF2) in relation to this coordinate system. An optical console system (C, C1, C2) serves to interrogate the optical shape sensing elements in both optical fibers (OSF1, OSF2), and to accordingly determine a measure of a three-dimensional shape (I) of both optical fibers (OSF1, OSF2), based on the registered position (R2) of the second optical fiber (OSF2) in relation to the coordinate system. This provide the possibility of providing 3D optical shape sensing of the length of both optical fibers (OSF1, OSF2), thus allowing 3D shape reconstruction of e.g. long medical devices with lengths of several meters. More than two shape sensing optical fibers, e.g.

Abstract: A measuring probe includes a stylus having a contact part to be in contact with an object to be measured, an axial motion mechanism having a moving member that allows the contact part to move in an axial direction, and a rotary motion mechanism having a rotating member that allows the contact part to move along a plane perpendicular to the axial direction by means of rotary motion. The measuring probe includes a main body housing that supports the axial motion mechanism, a module housing that supports the rotary motion mechanism, and a displacement detector supported by the main body housing for detecting displacement of the moving member. The measuring probe with this configuration ensures high measurement accuracy while keeping a low cost.

Abstract: Autofocus system (AF) employing, in addition to specified optical units, fringe projection and fringe detection systems (FPS, FDS) and specifically-configured data processing system. AFS is configured to project with FPS a sinusoidal fringe pattern, formed by a pattern source, on a substrate and to image the so projected pattern from substrate onto optical detector with FDS to form optical image from which topology of the substrate is defined as substrate moves relative to the projected pattern. Pattern source may include diffraction grating oriented that the projected pattern is inclined relative to direction of substrate scanning Topology profile is corrected for tilt of substrate, Goos-Hanchen errors, and for fringe-pattern-induced errors outside a chosen spatial-frequency range. To reduce errors of topology profile, at least five values of phase difference are used. AFS is configured to define temporal phase shifting in optical image without using any moving parts in the AFS.

Abstract: A system for an installation and a method for operating a system, including stationary transceiver modules and a vehicle having a transceiver module, the individual transceiver module having a controllable light source and a light sensor, so that a data transmission is able to be carried out between the vehicle and the stationary modules.

Abstract: In a state of mapping sensors having been advanced into a carrier by a sensor advance/withdraw mover, a sensor lifting and lowering device moves the mapping sensors up and down. With this movement, the mapping sensors detect presence or absence of substrates in a horizontal direction crossing a fore-and-aft direction in which the substrates are moved into and out of the carrier, and a height sensor detects heights of the mapping sensors. Consequently, substrate heights are detected in two different locations in the fore-and-aft direction. Based on the substrate heights, a substrate condition acquiring unit acquires a tilt of each substrate relative to the horizontal in the fore-and-aft direction. The tilt of each substrate inside the carrier is acquired in advance, thereby to be able to prevent substrate damage due to contact between a hand of a substrate transport mechanism and the substrates.

Abstract: Novel tools and techniques for monitoring railway track geometry. In one aspect, some such tools and techniques can determine a location of a platform along a railway, capture one or more images of the railway, and/or analyze the rail configuration at that point. In another aspect, some solutions might employ photogrammetric techniques to analyze the rail configuration and thereafter store data about the rail configuration, perhaps correlated with the location of the images, in a data store.

Abstract: One embodiment of the invention includes a vibrating-mass gyroscope system. The system includes a sensor system comprising a vibrating-mass and a plurality of electrodes coupled to the vibrating-mass that are configured to facilitate in-plane motion of the vibrating-mass. The system also includes a gyroscope controller configured to generate a drive signal that is provided to a first set of the plurality of electrodes to provide an in-plane periodic oscillatory motion of the vibrating-mass along a drive axis, to generate a force-rebalance signal that is provided to a second set of the plurality of electrodes to calculate a rotation of the vibrating-mass gyroscope system about an input axis, and to generate a quadrature signal that is provided to a third set of the plurality of electrodes to substantially mitigate quadrature effects associated with the vibrating-mass.

Abstract: The subject matter disclosed herein relates to a system and method for receiving a plurality of signals generated by a plurality of sensors adapted to detect physical movement of a mobile device with respect to a plurality of coordinate axes. A time at which at least one of the received signals is digitized is delayed to provide an output of digitized versions of the received plurality of signals synchronized with respect to a common point in time.

Abstract: A method of previewing off-road trails and viewing associated health requirements includes receiving selection of an off-road trail from a user, and displaying an overview of the selected off-road trail in response to receiving selection of the selected off-road trail from the user, the overview of the selected off-road trail indicating latitude and longitude coordinates associated with the selected off-road trail, elevation data associated with the selected off-road trail, and recommended minimum health guidelines associated with the selected off-road trail.

Abstract: A guidance platform for providing guidance information is disclosed. The guidance platform receives a request from a user to navigate to a destination point. Based on the request, the guidance platform calculates a route to the destination point from a current location of the user. Further, the guidance platform selects guidance beacons installed along the calculated route. The guidance platform then activates the guidance beacons to initiate a presentation of the guidance information to the user.

Abstract: A method is provided for partitioning probe data into a plurality of subsets, map matching a portion of the subsets and establishing a route based on the map-matched subsets of probe data. A method is provided that includes: receiving probe data points from a plurality of probes, where an uncertainty of the measurement of the probe data is a first distance; partitioning the probe data from the plurality of probes into subsets of probe data, where the subsets are created by ensuring each subset has probe data points that are at least two times the first distance apart from one another; performing map-matching on each subset of probe data; and establishing a route for each subset based on the map-matching of each subset of probe data. Establishing a route for each subset may include determining a route according to at least one of the shortest, fastest, or simplest routes.

Abstract: Aspects of the present disclosure relate generally to systems and methods for assessing validity of a map using image data collected by a laser sensor along a vehicle path. The method may compile image data received from the laser sensor. The map subject to assessment may define an area prohibiting entry by a vehicle.

Abstract: A method for obtaining updated travel condition data at a vehicle is provided. The method identifies a subset of a predetermined travel route that is ahead of the vehicle, based on a selected distance quantity and a current position of the vehicle during traveling; and requests a set of data for the subset, the updated travel condition data comprising the set of data.

Abstract: Aspects of the present disclosure are generally related to one or more systems, methods, and devices for forecasting the likelihood of locating available parking spaces at various remote locations, and navigating a vehicle to the available parking space. In some examples, aspects of the present disclosure may utilize a variety of data sources (e.g., historical data, surveyed data, and real-time parking availability data) in order to predict the likelihood of locating the available parking space within the confines of an available hours of service (HOS) requirement of a driver of the vehicle.

Abstract: A method and device for carrying out travel route planning for a vehicle, in which schedule data are transmitted to a calculation unit, which is coupled to a data memory, in which data relating to a path network for the vehicle and data relating to the geographic positions of energy supply facilities are stored. The calculation unit checks if a route sequence which connects the geographic positions of the destinations associated with the schedule data is calculable such that the destinations are reached at the associated time data of the schedule data, wherein the prognosticated residual energy amount in the energy store of the vehicle for travelling the route sequence is determined and taken into account, if no such route sequence is calculable using the calculation unit, the latter determines matched schedule data for which such a route sequence is calculable, and the matched schedule data are output.

Abstract: Adaptive navigation techniques are disclosed that allow navigation systems to learn from a user's personal driving history. As a user drives, models are developed and maintained to learn or otherwise capture the driver's personal driving habits and preferences. Example models include road speed, hazard, favored route, and disfavored route models. Other attributes can be used as well, whether based on the user's personal driving data or driving data aggregated from a number of users. The models can be learned under explicit conditions (e.g., time of day/week, driver ID) and/or under implicit conditions (e.g., weather, drivers urgency, as inferred from sensor data). Thus, models for a plurality of attributes can be learned, as well as one or more models for each attribute under a plurality of conditions. Attributes can be weighted according to user preference. The attribute weights and/or models can be used in selecting a best route for user.

Abstract: Adaptive navigation techniques are disclosed that allow navigation systems to learn from a user's personal driving history. As a user drives, models are developed and maintained to learn or otherwise capture the driver's personal driving habits and preferences. Example models include road speed, hazard, favored route, and disfavored route models. Other attributes can be used as well, whether based on the user's personal driving data or driving data aggregated from a number of users. The models can be learned under explicit conditions (e.g., time of day/week, driver ID) and/or under implicit conditions (e.g., weather, drivers urgency, as inferred from sensor data). Thus, models for a plurality of attributes can be learned, as well as one or more models for each attribute under a plurality of conditions. Attributes can be weighted according to user preference. The attribute weights and/or models can be used in selecting a best route for user.

Abstract: Systems and techniques for updated routing are described. A device computes a route from an origin to a destination and provides updated navigation information as a user travels along the route. In response to a change in orientation of the device, a display element is presented indicating the orientation of the device, allowing the user to enter an indication to compute an updated routing based on the orientation of the device. In one or more embodiments of the invention, a user may be presented with routing information such as time and distance information based on potential routing computed a detected orientation of an orientation detection device.

Abstract: A method and an apparatus can provide map information to a user or a driver. In the method, a range that is, based upon a current specific location on the map, currently representable on the screen, is determined. A road included in the range that is currently representable on the screen can be shown with a road name. In response to each change of at least one of the specific location or the range, the range is determined and the road with the corresponding road name can be provided.

Abstract: Techniques of barometric calibration of altitude determination by user equipments in a mobile communications network are discussed. In various embodiments, for a plurality of the user equipments, at least one subset of the user equipments is established. Barometric calibration data is determined for the established at least one subset and sent to the user equipments.

Abstract: Generally, implementations of the present invention include devices, systems, and methods for tracking intermittent motion. Such systems can be used to calibrate inertial measurement units (IMUs), which can be used to obtain acceleration, linear and angular velocities, orientation, and position of a moving body. Such systems also can be used to account and compensate for errors and imperfections present in an IMU prior to and during operation.

Abstract: In a position detection device of a type that omits a secondary coil, various inconveniences arising from the use of a voltage-dividing resistance (fixed resistor) are eliminated. At least two pairs of coils are provided. A magnetism-responsive member are placed so as to effect relative displacement in relation to the coils, the relative position of the member in relation to the coils varies with a position of a detection object, and impedance of each coil is varied with the relative position. The impedance changes of two coils constituting each one of coil pairs present characteristics of mutually opposite phase characteristics. For each coil pair, the two coils constituting the pair are connected in series with each other, and from a connection point thereof, a voltage-divided output voltage according to the impedance of the two coils is taken out as a detection output signal for the pair.

Abstract: Embodiments relate to magnetic field sensors, such as magnetic field angle sensors with generally on-axis arrangements of sensor elements relative to a rotation axis of a magnet or shaft. The shaft comprises or is coupled to an end portion that comprises a soft magnetic material, in embodiments, with the end portion having an end surface proximate the sensor that is rotationally asymmetric with respect to the rotation axis running through the length of the shaft. The sensor comprises at least three magnetic field sensing elements arranged in a plane generally perpendicular to the shaft and rotation axis. Circuitry forming part of or coupled to the sensor is configured to estimate a rotational position of the shaft by combining the signals of the at least three magnetic field sensing elements.

Abstract: A method for determining a position of a magnet assembly relative to an array of inductive elements arranged adjacent to a magnetically permeable material, the method involving: measuring electrical characteristics of each of one or more inductive elements of the array of inductive elements; and from information derived from the measured electrical characteristics of the one or more inductive elements of the array of inductive elements, determining the position of the magnet assembly relative to the array of inductive elements.

Abstract: A measurement system having a first magnetic field sensor and having a magnet for generating a magnetic field, in which the magnet has a first pole face and a second pole face, wherein an axis of rotation is defined perpendicular to the first pole face and perpendicular to the second pole face, wherein the magnet is supported for rotation about the axis of rotation, in which the first magnetic field sensor is positioned facing the first pole face and at a distance from the axis of rotation, in which the magnet has a rotational asymmetry of the flux density in the region of the first pole face, wherein the flux density of the magnet in the first magnetic field sensor can be adjusted between a maximum and a minimum by rotation of the magnet about the axis of rotation.

Abstract: A position measuring instrument including a code carrier having first and second code tracks, each including an identical series of code elements, wherein each of the series of code elements has two subregions with complementary properties. A scanning unit having detectors for scanning code elements, wherein each of the code elements defines one corresponding code word, wherein each of the code words defines an absolute position in the measuring direction, and wherein the detectors form a corresponding scanning signal from each of the two subregions of the series of code elements. An evaluation unit generating one item of code information for each of the series of code elements from each corresponding scanning signal, and forming the corresponding code words from the one item of code information, wherein each of the code words is composed of N and K items of code information from successive code elements of the first and second code tracks, respectively, with N and K being greater than 1.

Abstract: There is provided an absolute encoder advantageous in accuracy of an output thereof against a defect in a scale thereof. In the absolute encoder, a detector detects a part of an array of marks of the scale, and outputs a data sequence corresponding to the part. A processor stores information indicating a correspondence between each of a plurality of code sequences and an absolute coordinate of motion of the scale, and outputs information of the absolute coordinate based on the data sequence and the information. The processor detects an error of the data sequence, and performs rewriting of the information based on the detected error.

Abstract: There is described a sensor apparatus. It comprises an interrogator comprising a light source emitting pulses having a wavelength about an average wavelength; and a fiber Bragg grating (FBG) arrangement. The arrangement comprises a FBG sensor array comprising a plurality of FBG sensors on an optical fiber and being for reflecting the pulses, thereby producing reflected pulses at each one of the FBG sensors. FBG sensors of a given FBG sensor array have a spatial separation therebetween which is sufficient to allow, at a receiver, a temporal discrimination between the reflected pulses produced by each one of the FBG sensors. The FBG sensor array has a spectral reflection window which comprises the average wavelength.

Abstract: Fiber optic sensors based on multicore optical fibers that are intended for use in harsh environment sensing. This multicore fiber comprises an arrangement of optically coupled cores in a silica background. Sensors are fabricated by splicing a section of multicore fiber between two single mode fibers. This multicore fiber sensor is simple and repeatable to fabricate and multiple sensors can be multiplexed in a chain. These fiber optic sensors are intended for a broad set of sensing applications including temperature, pressure, strain, bending, acoustic vibrations, mechanical vibrations, or combinations thereof.

Abstract: Provided are systems and methods for accurate sensing of particle concentrations in fluids by employing a particle impactor system that allows for collection, growth and analysis of biological particles. The disclosed systems and methods make use of a pressure based flow sensor which permits the particle impactor system systems to accurately and reliably provide measurements of biological particle concentrations in the ambient environment. By incorporation of pressure sensors and pressure measurements into the flow measurement techniques, embodiments provide for the ability to use a particle impactor system to accurately measure environmental biological particle concentrations at a variety of atmospheric pressure conditions, such as at high altitude or with minimal perturbation from atmospheric weather conditions, without requiring recalibration or other adjustment of the sensors and control systems.

Abstract: An electromagnetic flowmeter has a flowtube configured to carry a conductive fluid. The flowtube has wall made of a conductive material. The wall has an inner surface surrounding a fluid flow path for the fluid. A non-conductive liner is positioned to electrically insulate the flowtube wall from the fluid. The flowtube and non-conductive liner define an electrode mounting hole. An electrode extends through the electrode mounting hole. The electrode and the non-conductive liner form a fluidic seal between the electrode mounting hole and the fluid flow path. At least a portion of the electrode is arranged in fluid communication with the flowtube within the electrode mounting hole. A short circuit detector can detect failure of the seal when conductive fluid that has leaked past the seal creates a short circuit as a result of the fluid communication between the flowtube and the electrode mounting hole.

Abstract: In order to provide a thermal flow meter for improving workability of a flow rate measurement device having a temperature measurement function for the measurement target gas and measurement accuracy for measuring a temperature, the thermal flow meter is structured such that a flow rate measurement circuit package having a protrusion for measuring a gas temperature is formed through resin molding. An inlet port opened to the upstream side of the measurement target gas is formed, a protrusion is arranged inside the inlet port, an inlet port and an outlet port are formed in the front and rear covers along the protrusion, and the measurement target gas received from the inlet port flows along the protrusion. Since the measurement target gas subjected to the measurement flows along the protrusion, it is possible to reduce influence of the heat from other heat resources and improve measurement accuracy.

Abstract: A flow rate measuring apparatus includes: a flow rate detecting device placed in an intake passage; a detection circuit for outputting an analog signal varying depending on the flow rate; a conversion circuit for converting the analog signal to a digital signal; a temperature detecting device for detecting an ambient temperature; and a correction circuit for primarily correcting the digital signal using a gain and/or an offset (correction coefficient) that can set the temperature coefficient in any appropriate way. The gain and/or the offset vary depending on the temperature coefficient set in any appropriate way and the ambient temperature detected by the temperature detecting device. Also, a plurality of the gains and/or the offsets are set depending on the flow rate, allowing the temperature characteristic error in flow rate measurement to be reduced.

Abstract: A brace bar (300, 400, 500, 600, 700) is provided. The brace bar (300, 400, 500, 600, 700) includes a brace bar body (302, 402, 502, 602, 702) with a perimeter, a first aperture (304a, 404a, 504a, 604a, 704a) and a second aperture (304b, 404b, 504b, 604b, 704b) in the brace bar body (302, 402, 502, 602, 702), and a gap (306, 406, 506, 606, 706) formed in the brace bar body (302, 402, 502, 602, 702) connecting the first aperture (304a, 404a, 504a, 604a, 704a) and the second aperture (304b, 404b, 504b, 604b, 704b) wherein the gap (306, 406, 506, 606, 706) is wholly contained within the perimeter of the brace bar body (302, 402, 502, 602, 702).

Abstract: A flow meter includes a meter body including a longitudinal axis, an outer surface, and a fluid passageway therethrough, and a plurality of electronics housings supported on the meter body by an enclosure assembly, wherein the enclosure assembly includes a base supported by the meter body, a tubular member having a passage for the passing of a transducer cable, a bracket member coupled to the tubular member, the bracket member having a pair of longitudinally extending sides, a pair of laterally extending sides at longitudinal ends of the bracket member, and a conduit member extending between the longitudinally extending sides.

Abstract: A method of determining an internal volume (V) of a filter or bag device includes pressurizing the device to a first pressure (p1) lower than a proof pressure by supplying a test gas, pressurizing the device to proof pressure (pp), and at the same time, measuring the mass flow (m) or the volumetric flow of test gas, determining the gas temperature (T), and determining the internal volume (V) based on the equation for ideal gases, such that: V=m×R×T/(pp?p1) where V is the internal volume, m is the mass flow, R is the gas constant, T is the gas temperature, pp is the proof pressure and p1 is the first pressure. A computer program product and a testing apparatus for performing the above-mentioned method also are provided.

Abstract: An oil level gauge device in which an oil level gauge is inserted in a guide pipe communicating with an oil pan, is provided. In the oil level gauge, a cap having a plug configured to fit on an inner peripheral surface at one end portion of the guide pipe, and a flange integrally formed with the plug and abutted with the one end of the guide pipe, is provided. A groove extending from a deeply inserted side of the plug to an abutment surface of the end abutting the flange is formed in the inner peripheral surface. When the plug is fitted on the inner peripheral surface, a ventilation passage for communicating the inside and outside of the oil pan through the guide pipe is formed between the plug and the guide pipe by the groove.

Abstract: A method for indicating the level of a liquefied gas in a cryogenic tank having a resistance temperature detector (1). The controller applies a heating pulse to the detector and performs a single resistance measurement after the heating pulse. The overheating of the sensor and the time interval for the measurement are found in a separate set of test experiment. As a result, for temperature sensors with negative temperature coefficient, the resistance of the sensor in gas is below some unique characteristic value, which can be used like a threshold criterion to distinguish between the liquid and the gas in a wide temperature range. For sensors with positive temperature coefficient, the resistance of the sensor in gas is larger than some unique characteristic value, which can be used like a threshold criterion to distinguish between the liquid and the gas in a wide temperature range.

Abstract: A sensor assembly is described herein that can automatically calibrate itself upon installation into an empty bin, eliminating the need to actually fill the bin to calibrate the level reading. The sensor will provide consistent measurement regardless of material properties (permittivity, density, temperature or moisture content). The capacitive nature of the sensor means that in some circumstances, it will sense the material through plastic/glass/fiber glass thereby allowing the sensor assembly to be mountable on the outside of a bin or container. The electrodes of the sensor system are designed to provide a continuous level reading.

Abstract: A guided wave radar level measurement device includes a process connection composed of an outer conductor and a central conductor. The central conductor is surrounded at least in part by a dielectric material. One or more resilient metal seals can be employed to form a hermetic seal around a portion of the probe. The metal seal protects the dielectric material such that the hermetic seal is isolated from process and temperature shock. The metal seal(s) can be further mated with one or more insulators and one or more gaskets, the metal seal(s) to provide a thermal and mechanical barrier as well as offering chemical resistance to the guided wave radar level measurement apparatus.

Abstract: A measuring device may be provided with a cover configured to close an opening provided on a fuel tank; a plug configured to close a through hole provided on the cover; and a sensor configured to measure a property of fuel inside the fuel tank. The plug may be provided with an electrical connector and a fuel passage. The electrical connector may be configured to electrically connect inside and outside of the fuel tank. The electrical connector may pierce through the plug from an upper surface to a lower surface of the plug The fuel passage may include an inlet configured to open to the inside of the fuel tank to receive the fuel from the inside of the fuel tank. The sensor may be disposed in the fuel passage of the plug.

Abstract: Provided is a liquid surface detection device providing for compactness and enabling a reduction in displacement of a rotating shaft of a magnet.