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.

Abstract: According to one embodiment, a structure evaluation system according to an embodiment includes a plurality of sensors, a position locator, a corrector, and an evaluator. The plurality of sensors detect elastic waves generated from a structure. The position locator locates the position of a generation sources of a plurality of elastic waves on the basis of the plurality of elastic waves detected by the plurality of sensors. The corrector corrects information based on the position locating performed by the position locator using a correction value set in correspondence with an impact. The evaluator evaluates a deterioration state of the structure on the basis of the corrected information.

Abstract: A non-contact non-destructive inspection system according to an embodiment includes a sensor, a velocity detection unit, and a damage detection unit. The sensor detects a second elastic wave emitted to a medium surrounding an inspection object due to a first elastic wave propagating through the inspection object. The velocity detection unit detects a velocity of the first elastic wave based on a wavefront angle of the second elastic wave and a velocity of the second elastic wave. The damage detection unit detects damage to the inspection object based on the velocity of the first elastic wave.

Abstract: A measuring method in an embodiment includes detecting elastic waves generated in a structural object formed of a solid material in a non-contact manner and estimating a position of an occurrence source of the elastic waves on the basis of information regarding an intensity of a signal of the detected elastic waves.

Abstract: According to one embodiment, a vehicle information estimation system according to an embodiment includes at least one sensor and a vehicle count estimator. The at least one sensor detects elastic waves generated from a structure. The vehicle count estimator estimates the number of vehicles that have passed through on the structure using the elastic waves detected by the at least one sensor.

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 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: A state evaluation system includes a sensor, a filter, a signal processor, and an evaluator. The sensor detects elastic waves which are generated from industrial equipment in operation. The filter can pass elastic waves having frequency characteristics based on abrasion which is generated in the industrial equipment. The signal processor extracts a plurality of feature values using the elastic waves passing through the filter. The evaluator evaluates an abnormality of the industrial equipment on the basis of a combination of the extracted plurality of feature values.

Abstract: A structure evaluation system includes a plurality of sensors and an evaluator. The plurality of sensors detect elastic waves generated in prestressed concrete in which a prestressed concrete steel material is internally provided. The evaluator evaluates a breakage of the prestressed concrete steel material based on elastic waves detected for a second period, which is a period after the elapse of a first period from a point in time when a magnitude of the elastic waves detected by the plurality of sensors is greater than or equal to a threshold value.

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 detection system of an embodiment includes a sensor configured to detect elastic waves and a determiner. The determiner determines a region where an elastic wave generation source is positioned on the basis of waveform information if the waveform information including a plurality of peak groups related to one elastic wave is included in a detection result of the sensor.

Abstract: According to one embodiment, a detection system of an embodiment includes a sensor configured to detect elastic waves and a determiner. The determiner determines a region where an elastic wave generation source is positioned on the basis of waveform information if the waveform information including a plurality of peak groups related to one elastic wave is included in a detection result of the sensor.

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 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.

Abstract: According to one embodiment, a structure evaluation system of the embodiments includes a plurality of sensors, a position locator, and an evaluator. The plurality of sensors detect elastic waves. The position locator locates elastic wave sources on the basis of a plurality of elastic waves detected by each of the plurality of sensors. The evaluator evaluates a deterioration state of a structure in accordance with a presence or absence of a sensor and an elastic wave source distribution which shows a position of the elastic wave sources obtained on the basis of a result of locating of the elastic wave sources.

Abstract: According to one embodiment, a detection system includes a base member, a plurality of sensors, and one or more processors. The plurality of sensors are provided on the base member, and detect an elastic wave from a test object of a plurality of test objects. The elastic wave propagates through a connecting member among a plurality of connecting members that connect the test objects with the base member. The connecting members each have a thickness smaller than a wavelength of the elastic wave. The one or more processors detect an abnormality of the test objects based on the detected elastic wave.

Abstract: According to one embodiment, a method for arranging a detection device for a structure is provided. The structure includes a member; a trough rib provided on an opposite side of the member; and a welded portion that is provided along an end of the trough rib facing the member and fixes the member and the trough rib. The method includes: attaching, to the trough rib, a plurality of acoustic emission sensors so as to be separated from each other in a direction in which the welded portion extends, wherein the following relationship is satisfied: ?20 degrees<?<20 degrees, where ? denotes an angle between a line connecting any given two adjacent acoustic emission sensors of the plurality of the acoustic emission sensors and a reference line extending in the direction in which the welded portion extends.

Abstract: According to one embodiment, a structure evaluation system includes an impact imparting unit, a sensor, and a structure evaluation device. The impact imparting unit applies impacts to a structure. The impact imparting unit applies the impacts at a frequency equal to or less than a frequency determined in accordance with an intensity at which the impacts are imparted. The sensor detects elastic waves. The structure evaluation device evaluates a deterioration state of the structure on the basis of the detected elastic waves.