Abstract: A sensor module according to an embodiment includes a sensor; a sensor holder that holds the sensor and includes a pressing force application portion to apply a pressing force to press the sensor toward a measurement target object side; an adhesion portion that adheres the sensor holder to the measurement target object by an adhesion force; and a change mechanism that changes a relative magnitude relationship between the pressing force and the adhesion force.

Abstract: According to one embodiment, a sensor attachment/detachment device of the embodiment includes a sensor, a bonding member, a support portion, and a release execution portion. The bonding member is bonded to a first surface of the sensor and has a function of decreasing an adhesive force. The support portion can support the sensor by directly contacting a second surface of the sensor or via another functional portion. The release execution portion performs a process of releasing the bonding member from the object by decreasing the adhesive force of the bonding member after the sensor is attached to the object by the bonding member.

Abstract: An adhesion/peeling method according to an embodiment includes adhering a first surface side of an electrically peelable adhesive sheet to a predetermined position of a fixation target object, wherein the electrically peelable adhesive sheet is formed of an electro-peeling adhesive having adhesiveness on the first surface side and a second surface side thereof, and the adhesiveness of the electro-peeling adhesive is lowered due to an input of a voltage; adhering a first electrode of an adherend including the first electrode formed of a conductor to the second surface side of the electrically peelable adhesive sheet; containing a liquid at the predetermined position of the fixation target object to temporarily form a second electrode with conductivity on a surface of the fixation target object; and inputting a predetermined voltage between the first electrode and the second electrode to peel of the electrically peelable adhesive sheet from the fixation target object.

Abstract: According to one embodiment, a structure evaluation system includes a wave guide, a first sensor, a second sensor, and a calculation part. The wave guide is formed in a rod shape, is inserted into a hole that is formed at a predetermined depth from a surface of a measurement target, and has one end fixed to a deepest portion of the hole. The first sensor is provided at the other end of the wave guide at a position that is substantially the same as the surface. The second sensor is provided on the surface of the measurement target. The calculation part estimates a depth of damage occurring in the measurement target from the surface on the basis of a first detection value of an elastic wave transmitted to the measurement target which is detected by the first sensor through the wave guide and a second detection value obtained by an elastic wave which is detected by the second sensor.

Abstract: According to one embodiment, a structure evaluation system includes a plurality of sensors, an acquirer, a calculator, and an evaluator. The plurality of sensors detects elastic waves generated from the structure. The acquirer acquires detection information for an evaluation target period in which information on at least an amplitude of each elastic wave detected by each of the plurality of sensors is associated with time information on the time when each elastic wave is detected. The calculator calculates an evaluation value, which is a slope of an amplitude scale-based frequency distribution of elastic waves, every predetermined period based on the acquired detection information for the evaluation target period. The evaluator evaluates a deterioration state of the structure based on the time-series data of each evaluation value calculated every predetermined period.

Abstract: An object adhesion/peeling method according to an embodiment includes adhering a adhesion target object to a second surface side of an adhesive sheet, wherein the adhesive sheet includes adhesive surfaces on a first surface side and the second surface side, and a first electrode and a second electrode provided to be adjacent to the first electrode are provided on the first surface side; adhering the first surface side of the adhesive sheet to a fixation target surface; inputting a predetermined voltage to the first electrode and the second electrode to generate a potential difference based on the predetermined voltage in a direction orthogonal to a layer thickness direction of the adhesive sheet; and causing an electrochemical reaction on the first surface side of the adhesive sheet to peel off the adhesive sheet from the fixation target surface.

Abstract: According to one embodiment, a structure evaluation system includes an impact imparting unit, a plurality of sensors, a position locator, and an evaluator. The impact imparting unit applies impacts to a second region different from a first region of a structure to which traveling sections of a vehicle, which travels on the structure, apply impacts. The plurality of sensors detect elastic waves generated in the structure. The position locator locates a position of a source of the elastic waves on the basis of the elastic waves detected by each of the plurality of sensors. The evaluator evaluates a deterioration state of the structure on the basis of a position location result of the position locator.

Abstract: According to one embodiment, a detection system is provided that detects a state of a structure consisting of a first member that supports a traveling surface along which a vehicle travels from downward; a second member provided on an opposite side of the traveling surface with respect to the first member; and a welded portion that is provided along an end of the second member facing the first member and fixes the first member and the second member. The detection system includes: a first sensor group including first AE sensors; a second sensor group including second AE sensors; and a position orientator that performs separately a first determination that determines a generation source position of elastic waves based on the detection results of the first AE sensors and a second determination that determines the generation source position of elastic waves based on the detection results of the second AE sensors.

Abstract: According to one embodiment, a structure evaluation system according to an embodiment includes a plurality of sensors, a position locator, and an evaluator. The plurality of sensors detect elastic waves. The position locator locates positions of elastic wave sources by using the elastic waves among the plurality of elastic waves respectively detected by the plurality of sensors having an amplitude exceeding a threshold value determined according to positions of the sources of the plurality of elastic waves and the positions of the plurality of disposed sensors. The evaluator evaluates a deteriorated state of the structure on the basis of results of the position locating of the elastic wave sources which is performed by the position locator.

Abstract: According to one embodiment, a corrosion determination system according to an embodiment includes one or more sensors, an index data acquirer, and a corrosion determiner Elastic waves generated from a structure including at least a member that generates elastic waves due to corrosion are detected. The index data acquirer acquires index data that is an index of an amount of water on the surface of the structure. The corrosion determiner determines whether there is corrosion in the structure based on elastic waves generated due to corrosion identified based on the index data among a plurality of elastic waves detected by the one or more sensors.

Abstract: According to one embodiment, a structure evaluation system includes at least three or more sensors, a position locator, and an evaluator. The three or more sensors are arranged on surfaces different from a surface to which an impact is applied with respect to a structure at different intervals in a first direction of the structure and a second direction orthogonal to the first direction and detects elastic waves generated from the structure. The position locator locates a position of a source in which the elastic waves are generated on the basis of the elastic waves detected by each of the three or more sensors. The evaluator evaluates a deterioration state of the structure on the basis of information based on a position location process of the position locator and information indicating a position where the impact is applied.

Abstract: According to one embodiment, a cantilever array includes a plurality of cantilever pairs. Each of the cantilever pairs includes a first cantilever and a second cantilever facing the first cantilever while having a gap, and which are arrayed in a direction orthogonal to a facing direction. Positions of the gaps of the cantilever pairs shift from each other when viewing in an array direction.

Abstract: According to one embodiment, a sensor includes a first structure body, a second structure body, and a detector. The first structure body includes a supporter, a deformable part supported by a first portion of the supporter, and a membrane part. At least a portion of the membrane part is connected to the deformable part and a second portion of the supporter. The second structure body is connected to the first structure body. A liquid is provided between the first structure body and the second structure body. The detector outputs a signal corresponding to a deformation of the deformable part.

Abstract: According to one embodiment, a damaged region determination system of the embodiment includes a plurality of sensors, a position locator, and a determiner. The plurality of sensors detects elastic waves generated in a target object related to a railway which is a determination target of a damaged region. The position locator locates positions of sources of a plurality of elastic waves based on the plurality of elastic waves detected by each of the plurality of sensors. The determiner determines the damaged region in the target object based on the positions of the sources of the plurality of elastic waves.

Abstract: According to one embodiment, a sensor module includes a sensor and a diagnosis circuit. The sensor includes piezoelectric transducers and switches. The piezoelectric transducers have different resonance frequencies. The switches are provided to correspond to the piezoelectric transducers, respectively. Each of the switches outputs an output signal corresponding to a voltage generated by an inverse piezoelectric effect of a corresponding piezoelectric transducer of the piezoelectric transducers. The diagnosis circuit diagnoses, based on a difference in pattern of the output signal, whether vibration has newly occurred in the sensor, and switch an output destination of the output signal of the sensor according to a result of the diagnosis.

Abstract: According to one embodiment, an inspection system of an embodiment is an inspection system for inspecting a bogie including a plurality of side beams extending in a front-rear direction and disposed apart from each other in a left-right direction and a cross beam connecting the plurality of side beams. The inspection system includes one or more sensors and a position locator. The one or more sensors are installed on at least one of the plurality of side beams and the cross beam and detect elastic waves. The position locator identifies a beam in which the elastic waves have been generated or locates a position of an elastic wave source on the basis of the elastic waves detected by the one or more sensors.

Abstract: According to one embodiment, a sensor includes first and second structure bodies, and a detector. The first structure body includes a supporter, and first and second deformable parts supported by the supporter. The second deformable part has at least one of a second length less than a first length of the first deformable part, a second width greater than a first width of the first deformable part, a second thickness greater than a first thickness of the first deformable part, a second Young's modulus greater than a first Young's modulus of the first deformable part, or a second spring constant greater than a first spring constant of the first deformable part. The second structure body is connected to the first structure body. A liquid is provided between the first and second structure bodies. The detector outputs a signal corresponding to a deformation of the first or second deformable part.

Abstract: According to one embodiment, a sensor module includes at least one sensor and at least one switch. The sensor includes a first piezoelectric element. The first piezoelectric element includes a first electrode. The first piezoelectric element is set with a resonance frequency to resonate at a vibration frequency of a detection target. The switch includes a second piezoelectric element. The second piezoelectric element includes a second electrode connected to the first electrode and a third electrode electrically separated from the second electrode.

Abstract: According to one embodiment, a detection system includes a plurality of sensors, a locator, a first counter, and a determiner. The plurality of sensors that detect an elastic wave, the sensors being disposed separately from each other in a direction in which the welded portion extends and each being installed on the first member or the second member. The locator that locates a generation source position of the elastic wave on the basis of outputs of the plurality of sensors. The first counter that accumulates information of generation source positions of a plurality of elastic waves located by the locator to calculate a distribution of generation source positions of the plurality of elastic waves over a predetermined time. The determiner that determines the position of the crack on the basis of the distribution calculated by the first counter.

Abstract: According to an embodiment, a nondestructive inspection method includes: detecting, by a plurality of sensors installed in a truck that supports a vehicle body, an elastic wave generated when a lifting member inserted between the vehicle body and the truck moves the vehicle body up and down; and estimating, by an evaluation device, a position of a defect in the truck, based on the elastic wave detected by the plurality of sensors.