Abstract: The invention relates to a device (10) for detecting and locating fluid leakage from a hydraulic work, the device being characterized in that it comprises a geotextile fabric (12) made of yarns or fibers and provided with: at least one first optical cable (14) in contact with said geotextile (12) and formed by a protective tube within which at least one multimode optical fiber (141) is placed, said multimode optical fiber (141) being suitable for detecting a temperature variation and transmitting a signal that is modified when temperature varies and at least one second optical cable formed by a sheath receiving tightly at least one monomode optical fiber (142) suitable for detecting a deformation of the geotextile (12) and for transmitting a signal that is modified when the deformation is detected in that said second optical being bonded to the geotextile (12). The invention is applicable to detecting and locating leakage from hydraulic works.

Abstract: A method to amplify the pressure effects of very small flows, or very small leaks, in contained fluid systems, and the effects of small leaks in fluid systems that have small flows such as would occur in a combustible gas system with lighted pilot lights or a contained water system with a drip watering system, while not affecting the normal operation of such fluid systems, and without interfering with the function of such small flows.

Abstract: Methods and systems are provided for monitoring cylinder valve deactivation in an engine operating with a plurality of cylinder valves. One example method comprises indicating valve degradation based on an indication of manifold pressure over a plurality of immediately successive induction events of the engine, said indication responsive to increases and decreases in the indication of manifold pressure correlated to the induction events of engine cylinders and further correlated to whether cylinders are commanded to be activated or deactivated.

Abstract: Methods and systems are provided for monitoring cylinder valve deactivation of a cylinder valve of an engine. One example method comprises, indicating degradation of cylinder valve deactivation in response to manifold pressure at or around a characteristic frequency.

Abstract: A tire pressure detector without the risk of causing a leaky tire includes a base having a forward projected and externally threaded annular wall and an annular limit wall to define an annular groove therebetween; a mating cover having an internally threaded annular wall for screwing to the externally threaded annular wall of the base with a free end of the annular wall received in the annular groove to press against an airtight seal ring set in the annular groove, such that an airtight space is defined in and between the assembled cover and base; a tire pressure detecting assembly being receiving in the airtight space; and a valve control assembly being mounted on the base to locate between the base and the mating cover. The annular limit wall prevents the cover from moving and deforming at the screwed portion to ensure good air-tightness between the cover and the base.

Abstract: Provided is a test section for a wind-tunnel testing apparatus that is capable of suppressing the influences of a boundary layer on the floor surface and incoming airflows from the sides, and that is capable of measuring aerodynamic forces closer to the those actually occurring. A test section for a wind-tunnel testing apparatus having a mounting section that mounts an automobile along the internal floor surface of a wind tunnel, tests being conducted by applying an airflow blown in the wind tunnel to the automobile mounted on the mounting section, includes a slit that is disposed on the floor surface located on the upstream side of the mounting section with respect to the airflow direction so as to extend in the intersecting direction intersecting the airflow direction and that sucks in a portion of the airflow near the floor surface; and lateral suction portions, disposed at both sides of the mounting section, that suck in the incoming airflows R flowing in from the sides of the mounting section.

Abstract: A fuel package includes a vessel wherein the interior space is separated, and has a flow-out opening and a flow-in opening that lead to the interior space, a liquid fuel filled in the region at the side of the flow-out opening in the vessel, and a follower that separates the liquid fuel and the region at the side of the flow-in opening.

Abstract: A device for sampling fluid from an earth formation is disclosed. The device includes: an inlet port disposable in fluid communication with the fluid in a borehole; an injector including an injection chamber in fluid communication with the inlet port, the injector configured to receive a portion of the fluid and direct the fluid toward an analysis unit for analyzing constituent materials in the fluid; and a high pressure valve configured to admit the portion of the fluid at a borehole pressure and release the portion of the fluid into the injector, the portion having a volume that is less than or equal to about one microliter. A system and method for analyzing constituents of fluid in a borehole in an earth formation is also disclosed.

Abstract: A flow meter includes: a body portion comprising a main flow path wherein flows a fluid to be measured, a first branch flow portion wherein the fluid to be measured branches and flows from the main flow path, a second branch flow portion wherein the fluid to be measured, which branches and flows from the first branch flow portion, flows into the main flow path, and narrow portions for restricting the flow of the fluid to be measured, provided in a primary flow path between the branch flow portions, a branched flow path structuring portion through which flows the fluid to be measured, connected to the branch flow portions; and a fluid measuring portion provided with a sensor disposed facing a flow path that is provided in the branched flow path structuring portion, wherein the sensor measures the fluid based on the detection results of the fluid introduced from the branch flow portions.

Abstract: An electrically heated, flexible fluid conduit or tube (40) includes an elongate, flexible tube body (42) defining a fluid flow path L (44) having a length (L) extending along a longitudinal axis (46). The tube body (42) includes an electrical resistance heater (48) surrounding the fluid flow path (44) over the length (L). The electrical resistance heater (48) has a heat output per unit length per voltage applied that does not vary when the tube body (42) is cut to different lengths.

Abstract: The invention relates to a method for determining the level L of a liquid within a specified measuring range by means of radar signals transmitted to the liquid surface and radar signals reflected from the liquid surface, comprising the steps of i) transmitting radar signals to the liquid surface in time sequence; ii) receiving radar signals reflected from the liquid surface in time sequence; iii) determining the level L partially on the basis the transmitted radar signals and the reflected radar signals. The invention further relates to a device for determining the level L of a liquid within a specified measuring range, at least comprising a radar antenna disposed above the liquid for transmitting radar signals to the liquid and receiving radar signals reflected from the liquid surface, as well as means for determining the liquid level L on the basis of the transmitted radar signals and the reflected radar signals.

Abstract: An oil level sensor comprises a body having a probe extending away from a nominal body portion. The probe receives a resistance thermal device and extends for a height away from the nominal surface. The probe has an outer dimension. The ratio of the outer dimension to the height is between 0.1 and 0.2. The RTD is connected to lead wires through splices, the lead wires leaving the nominal housing. A fastener tab extends away from the nominal body, and generally perpendicularly to the probe. The lead wires are anchored within a chamber, which is filled with a potting material.

Abstract: A gravity survey is conducted by obtaining relative gravity measurements from a plurality of survey points using a relative gravimeter, obtaining absolute gravity measurements from a subset of a lesser plurality of the survey points designated as combination survey points, determining a correction factor related to any difference between the relative and absolute gravity measurements at each of the combination survey points, and correcting the relative gravity measurements made at the survey points which are not combination survey points using the correction factor. The absolute and corrected relative gravity measurements at the survey points constitute the gravity survey.

Abstract: A sensor system having a substrate, that has a main plane of extension, and a seismic mass, the seismic mass being developed movably about a torsional axis that is parallel to the main plane of extension; and the seismic mass having an asymmetrical mass distribution with respect to the torsional axis; and furthermore an area of the seismic mass facing the substrate is developed symmetrically with respect to the torsional axis.

Abstract: A system for an adaptable aperture planar array for maintaining source resolution is provided. The system includes a first nested array defining a first aperture responsive to a first range of frequencies. The first aperture is sized based on an angle between the array and the source, and includes a first subset of sensor elements. The system includes a second nested array defining a second aperture responsive to a second range of frequencies that is less than the first range of frequencies. The second aperture is sized based on the angle between the array and the source, and includes a second subset of sensor elements. The first aperture and second aperture change in size as the angle changes, which results in a change in the sensor elements within the first subset and the second subset to maintain the source resolution for the array.

Abstract: A device of testing a vibrating device includes a housing, a connector, an indicator, and a vibrating sensing apparatus. The connector, the indicator, and the vibrating sensing apparatus are mounted with the housing, and electronically connected in series. When the test device is vibrated by a portable electronic device received in the housing, the vibrating sensing apparatus forms a closed circuit with the connector and the indicator to activate the indicator to indicate whether the vibrating performance of the portable electronic device is normal or not.

Abstract: The invention is a vibration sensor with a carrying element capable of being set into vibration; a conversion device having a field coil to set and/or tap the carrying element into vibration; an anchor mounted in the field coil; and, a vibration element to transmit the vibrations from the carrying element into/from a surrounding space. The anchor is designed as two parts, having a permanent magnet and a coil core connected to the field coil, with an air gap arranged therebetween and lying in the area of the axial extension of the field coil. The permanent magnet is connected to the carrying element to transmit vibrations; and, the field coil and the permanent magnet are arranged to interact in such a way that any vibration of the permanent magnet induces current flow in the field coil and/or induces vibration of the permanent magnet in the field coil.

Abstract: A vibrating electrode plate 24 that senses a sound pressure faces a counter electrode plate 25 to constitute a capacitance type acoustic sensor. In the counter electrode plate 25, acoustic perforations 31 are opened in order to pass vibration, and plural projections 36 are provided on a surface facing the vibrating electrode plate 24. An interval between the projections 36 is decreased in a region where the vibrating electrode plate 24 has high flexibility to easily generate local sticking with the counter electrode plate 25. The interval between the projections 36 is increased in a region where the vibrating electrode plate 24 has low flexibility to hardly generate local sticking with the counter electrode plate 25. The projections thus arranged prevent firm fixing of the vibrating electrode plate to the counter electrode plate and interruption of vibration of the vibrating electrode plate.

Abstract: A method of detecting and monitoring torsional oscillation in a mechanical coupling between a prime mover and a multiphase alternating current (AC) electrical generator, comprises the steps of: detecting in at least one received signal variations that are indicative of changes in the rotational speed of the electrical generator; extracting information from the detected variations that are indicative of torsional oscillation to produce a torsional oscillation signal that has information relating to at least the amplitude of the torsional oscillation; and monitoring the torsional oscillation signal to determine the presence and severity of the torsional oscillation in the mechanical coupling.

Abstract: A gyroscope sensor includes a gyro disk. A first light source is configured to provide a first light beam adjacent to a first edge of the gyro disk. A first light receiver is configured to receive the first light beam for sensing a vibration at a first direction of the gyro disk.

Abstract: The invention provides a fatigue exciter for wind turbine blades. Wind turbine blades require excitation at or near their natural frequency to induce bending moments that simulate in service loadings and must be easily controllable and with the minimum of unnecessary added mass or force. The invention provides a device and a method by which force controlled feedback is used for finding an optimal excitation frequency. This force could be provided e.g. by a digital signal generator.

Abstract: There is disclosed apparatus for measuring multiple pressures within different pressure ranges. The apparatus contains multiple pressure sensors which are positioned on a housing, where each pressure sensor is adapted to measure pressure within a different pressure range. The housing has an input port which is constructed to communicate with different output ports, where the output ports communicate with each different pressure sensor utilized in a different pressure range. The input port has a stepped or keyed aperture which is adapted to receive different pressure adapters to assure that, for example, only a high pressure will be applied to the high pressure sensor during high pressure measurements. By selecting another adapter, a mid-range pressure and a high pressure will be applied to the pressure sensors during the measurement of a mid-range pressure. By receiving a different adapter, a low pressure will be applied to all the pressure sensors during low pressure measurement.

Abstract: It is an objective of the present invention to provide a pressure transducer assembly for measuring pressures in high temperature environments that employs an elongated tube which is terminated at one end by an acoustic micro-filter. The micro-filter has a plurality of apertures extending from one end to the other end, each aperture is of a small diameter as compared to the diameter of the transducer and the damper operates to absorb acoustic waves impinging on it with limited or no reflection. To improve the absorption of acoustic waves, the elongated tube may be tapered and/or mounted to a support block and further convoluted to reduce the overall size and mass of the device. A pressure transducer with a diaphragm flush may be mounted to the elongated tube and extend through to the inner wall of the tube. Hot gases propagate through the elongated tube and their corresponding pressures are measured by the transducer.

Abstract: A system is disclosed for detecting an electrical sensor, the system includes a sensor signal processing circuit further comprising an input port to receive a connector including the output signal lines of the sensor, a resistor connected to the output signal line of said input port, wherein the resistor is connected to a predetermined voltage; a sensor circuit having a connector adapted to connect to the connector, wherein the sensor circuit has a resistance substantially less than the pull-resistor, and the sensor signal processing circuit detects an unconnected sensor based on the voltage applied by the resistor.

Abstract: A sensor device comprises a sensing component adapted to be connected to a monitoring system to send signals associated with deformation of a structural member. An adhesive is adapted to bond the sensing component to a surface of a structural member. A tape has at least one adhesive surface adapted to be adhered to the surface of a structural member to be monitored, with the sensing component being positioned between the tape and the surface of the structural member. The sensor device is used in combination with a monitoring system.

Abstract: There is provided a proof body for use in a strain gauge for measuring horizontal strains in a pavement. The proof body is to be inserted in a hole provided in a surface layer of the pavement. The proof body is designed to be embedded in a substitute core designed to be retrofitted in the hole. The proof body is designed to be attached to the walls of the hole, allowing measurement of horizontal strains in the pavement surface layer.

Abstract: A force sensor includes a substrate, a support layer, a film, a plurality of sensing portions, a plurality of electrodes, a plurality of sensing materials, and a filler. The support layer is disposed on the substrate. The film is supported by the support layer. The sensing portions extend from the film. The electrodes are correspondingly disposed on the sensing portions. The sensing materials are correspondingly disposed on the electrodes. The support layer, the film, the sensing portions, the electrodes, and the sensing materials encapsulated by the filler.

Abstract: A magnetic force sensor includes: an action portion on which an external force acts; a sensing unit converting a force working on the action portion into an electric signal; and an outer frame having an elastic body elastically supporting the action portion and storing the sensing unit therein. The sensing unit includes a magnetic flux generation source connected with the action portion and a magnetoelectric transducer fixed on the outer frame and the magnetic flux generation source has a magnetic body therewith that controls flow of magnetic fluxes generated by the magnetic flux generation source.

Abstract: The invention relates to a sample chamber with a cover plate and a bottom plate which is joined thereto in a fixed manner, wherein a recess is provided in the cover plate so that a reservoir is formed by the bottom plate, wherein a planar element with holes is provided in the reservoir, wherein the holes have a predetermined arrangement and/or size.

Abstract: The invention relates to a method and equipment for the testing of quality of polymer-bound rubber additives. According to the method, a polymer-bound rubber additive (3) is mixed with an EPDM masterbatch (2). The resultant test mixture (5) is forced through a test sieve (10), and the number of undispersed particles (14) removed by sieving is determined.

Abstract: A rough and fine movement device capable of moving a mobile body with high accuracy, and a liquid supply device incorporating such a device. First and second mobile bodies are movable along guide members with a connection member connecting the mobile bodies in a relatively movable manner. A first drive mechanism roughly moves the first mobile body by a first stroke. A second drive mechanism between the first and the second mobile bodies, finely moves the second mobile body relative to the first mobile body by a second stroke. The second drive mechanism on one of the first and second mobile bodies and includes an actuator having a contactor with a first contact surface. The other of the bodies includes a second contact surface which contacts the first contact surface. At least one of the first contact surface or the second contact surface is spherical.

Abstract: In a center-takeoff-type steering apparatus for a vehicle, radiant heat from a heat source such as an engine is shut off reliably. The bracket is fixed to a central portion of a rack bar for unitary movement, the rack bar moving in the lateral direction in accordance with a steering operation of a steering wheel. Ball joint mechanisms are assembled to the bracket. The ball joint mechanisms rotatably support the inboard ends of the tie rods, swing tie rods in accordance with the movement of the rack bar to thereby steer the left and right front wheels. The heat insulator is integrally formed to have an upper plate portion and a lower plate portion facing each other, and fixed to the bracket so as to cover the ball joint mechanisms.

Abstract: A servo-assistance mechanism (10) comprises an element (20) upon which a manual shifting force to be assisted acts. The servo-assistance mechanism (10) further comprises at least one valve piston (40, 48), arranged on the element (20), and at least one device (58, 60), for limiting the servo-assistance force. The valve piston (40, 48) comprises a first valve piston (42, 50) and a second valve piston (44, 52), and the first valve piston (42, 50) co-operates with the device (58, 60) for limiting the servo-assistance force and is arranged and radially sealed inside the second valve piston (44, 52).

Abstract: A shifting device (11, 40) with a servo-assistance mechanism (10), in particular for a transmission (30) of a motor vehicle which comprises an assembly for selecting and engaging a gear of the transmission (30) and an element (20) upon which acts a manual shifting force to be assisted. The servo-assistance mechanism (10) can produce a performance characteristic curve which, as a function of the manual shifting force or a shift phase, has ranges with different gradients or proportions with respect to the manual shifting force. Elements (88, 90, 106, 108), upon which a servo-pressure acts, are present in the servo-assistance mechanism (10) for producing the characteristic. In the control system of the servo-assistance mechanism (10), path limitation units and at least one elastic element (84, 110) are provided, upstream from and/or in the servo-assistance mechanism (10), to limit the servo-assistance force in a path-dependent manner for each gate or gear.

Abstract: An electronic selector lever module for generating gear shifting signals for an automatic transmission of a vehicle. The swivel motion of the gear selector lever, within a main shifting path, is transformed into rotational motion for an angle sensor. The sensor is positioned on a printed circuit board and is actuated by a rotor. To guide the rotor relative to the angle sensor, the rotor either surrounds a rounded part of the printed circuit board or surrounds a rotor guidance which is mounted on the printed circuit board. The mechanical linking point is a short sleeve at a slider, which both belong to the rotor, needed for the shifting path motion, and which also drive the tilting lever for the transverse motion. The slider can be moved, relative to the rotor, along rails, either radially and directly at the rotor, or tangentially to the pivot point of the rotor.

Abstract: A manipulator includes an arm body, a cable, and at least one cover fixed on the arm body. The arm body has at least one friction portion over which the at least one cover covers. The at least one cover separates the cable from contacting with the friction portion, thus protects the cable from being damaged by the friction portion.

Abstract: Disclosed herein is a robot, which is capable of communicating according to a gesture. The robot includes a plurality of link members, and an outer cover member surrounding the plurality of link members. The shape of the outer cover member is varied into a curved shape, when the outer cover member is adhered closely to the plurality of link members, according to the variation of the shapes of the plurality of link members.

Abstract: An object of the present invention is to improve the easiness of steadily maintaining the magnitude of treading on a foot-operated operating element, such as an accelerator pedal, while mitigating a feeling of treading on a wall at the time of start of treading on the operating element and an odd feeling at the time of easing off the operating element. A pedal-operated operation device includes a pedal arm, a support housing, a spring for urging the pedal arm in a direction of return, and a first shim and a second shim for generating a first resistance force and a second resistance force, respectively, against the relative pivotal movement of the pedal arm. A frictional engagement portion of the second shim is higher in maximum static friction force than a frictional engagement portion of the first shim.

Abstract: An adjustment mechanism is provided and includes a main body having a first ratchet portion, a slider movably connected to the main body, a button having a second ratchet portion, and an elastic member connecting the slider and the button. When the elastic member exerts a spring force on the button with the first and second ratchet portions engaged with each other, the slider is movable relative to the main body only in a first direction. When the button is pressed along a second direction, the second ratchet portion disengages from the first ratchet portion, so that the slider is movable relative to the main body in the first direction or in the other direction opposite to the first direction.

Abstract: A vehicle steering wheel assembly is provided with a fixed hub adapted to be mounted within a vehicle. A fixed ring member is mounted to the fixed hub offset from a center of the ring member. A rotating ring member is mounted to the fixed ring member and has a manual grip. The rotating ring member rotates about a center thereof. The rotating ring member is adapted to be operably connected to a steering linkage. The vehicle steering wheel assembly may be provided with an electronic motion sensor. The vehicle steering wheel assembly may be provided with a pinion and a ring gear.

Abstract: A hinge assembly for an electronic device includes a pintle and a cam member connected to the pintle. The cam member is moveable on the pintle. The cam member and the pintle provide an area frictional engagement therebetween such that the cam member can easily move on the pintle and does not make an undesired noise as well as has a good ability to withstand stress.

Abstract: A hinge assembly includes a cam device and a pintle inserted through the cam device. The cam device includes first and second cam members. The first cam member includes a recess inset on a side thereof and the second cam member includes a protrusion with a shape substantially corresponding to the recess. The protrusion is selectively positionable in the recess and moveable on the side of the first cam member. The recess is configured with first and second guiding sections, and the second guiding section is offset from the side at a first angle, and the first guiding section offset from the side at a second angle, and the second angle greater than the first angle such that the protrusion can be operably moved out of the recess with effort-saving effect.

Abstract: Method for generating a force vector, comprising the steps of: -providing at least a first mass and a second mass, -making the first mass rotate around an axis of rotation, -changing the distance between the first mass and the axis of rotation between two extreme positions while rotating the first mass, -making the second mass move around an axis of rotation, -changing the distance between the second mass and the axis of rotation between extreme positions while rotating the second mass, -making the masses move in opposite direction with respect to each other, -subjecting the masses to a deceleration phase and a subsequent acceleration phase while changing the direction of movement of said masses between the extreme positions, -making each acceleration phase of said masses directly adjoin a subsequent decelerating phase.

Abstract: The flexible bearing of the wave generator for a wave gear device is a deep-groove ball bearing in which an outer race and an inner race form an annular flexible bearing ring capable of bending in a radial direction. A ball diameter Da is set to be 5 to 15% greater than that of each model of the currently available product, and dimensions of orbital plane radii ro, ri of the inner and outer races are set so that the ratio ro/Da of the orbital plane radius ro of the inner race and the ball diameter Da, as well as the ratio ri/Da of the orbital plane radius ri of the outer race and the ball diameter Da, are both 0.8 to 2% less than those ratios in each model of the currently available product. When the ball diameter and the orbital plane radii are thus set, it is possible to substantially extend the service life of the flexible bearing.

Abstract: A power multiplier (1) having a housing (2) which houses a gear assembly (20) having four gear sets (21, 22, 23, 24) each having input gears (8) affixed to each other by an off-set input axle (7), output gears (9) affixed to each other by an off-set output axle (11) and linkages (12) which connect the off-set input axles to the off-set output axles thereby allowing the input gears to transfer rotational force to the output gears The gear sets are connected to each other by central input axles (6) and central output axles (10). The placement of the off-set output and off-set input axles progressively differs by ninety degrees clockwise going from the first gear set to the fourth gear set. The placement of the off-set output and off-set input axles in this manner allows for an equal distribution of rotational force around the central output axles thereby creating additional torque.

Abstract: A clamping device for a rotary index device for a machine tool, in particular, a normal clamp type clamping device makes it possible to simplify the structure thereof and to maintain a stabilized positioning performance. In a rotary index device (1) for the machine tool, in which the index position of, for example, a circular table (16) is maintained by normally clamping a clamp disc (11) with clamping means (6) and in which, for example, the circular table (16) is unclamped by unclamping means (13) when an indexing operation is performed, the clamping means (6) includes a fixing portion (7), a resiliently deformable supporting portion (8), and urging means (10). The fixing portion (7) is fixed to a housing (3) of the rotary index device (1) for the machine tool. One end of the supporting portion (8) is secured to the fixing portion (7), and a pressing portion (9) having a face that opposes the clamp disc (11) is secured to the other end of the supporting member (8).

Abstract: The present invention is directed to a method for producing a carbon fiber-pitch binder composition, the method comprising combining surface-modified carbon fibers with a molten pitch binder such that the surface-modified carbon fibers are substantially homogeneously dispersed throughout said molten pitch binder, wherein said surface-modified carbon fibers possess a surface that has been modified in a manner that increases the dispersability of the carbon fibers into said molten pitch binder. The invention is also directed to a method for producing a toughened graphite electrode and a method for processing metal in an electric arc furnace. The invention is also directed to carbon fiber-pitch binder compositions prepared by the inventive method in which carbon fibers are substantially homogeneously dispersed in the composition.

Abstract: A process for production of a chain metal powder, which comprises the steps of reducing metal ions contained in an aqueous solution, while applying a magnetic filed to the solution, in the presence of both a reducing agent capable of generating a gas during the reduction of metal ions and a foamable water soluble compound, through the generation of a gas, a bubble layer on the surface of the aqueous solution to form a chain metal powder, separating the bubble layer formed on the surface of the aqueous solution from the solution, and collecting the chain metal powder contained in the bubble layer.

Abstract: An improved nickel-chromium-iron alloy is provided, which comprises up to about 5% of hafnium-containing particles. In one embodiment, an improved creep resistant castable oxide dispersion strengthened nickel-chromium-iron alloy comprises up to about 5% of hafnium, with at least part of the hafnium being present as finely dispersed oxidized particles. Further embodiments of the improved alloy can comprise additionally up to about 15% by weight aluminum. The alloy is particularly useful in the production of creep resistant tubes and castings, for example, for the petrochemical market.

Abstract: Provided is a method of easily producing scorodite which is stable and has excellent filtering properties with excellent reproducibility and without using complex operations, when processing arsenic that is included in non-ferrous smelting intermediates, and particularly when processing copper arsenic compounds in the form of an intermetallic compound. Scorodite is produced by a leaching step of leaching arsenic from a non-ferrous melting intermediate containing a copper arsenic compound in the form of an intermetallic compound in the presence of a sulfidizing agent and an oxidizing agent, a solution adjusting step of oxidizing trivalent arsenic to pentavalent arsenic by adding the oxidizing agent to the leaching solution, and a crystallizing step of converting the arsenic in the adjusted solution to scorodite crystals.