Nec Corporation

Nec C Orporation

Junichiro Mataga

Masatake Takahashi

Hirofumi Inoue

Yasuhiro Sasaki

Shigeki Shinoda

Shin Tominaga

Katsumi Kikuchi

Hiroshi Sakai

Yukio Murata

Yasuharu Onishi

Jun Kuroda

Naofumi Suzuki

Mizuki Iwanami

Takahiro Kumura

Ukyo Mori

Soichiro Takata

A fluid leakage diagnosing device includes: when fluid leakage relating to a pipeline is being diagnosed by employing adaptive signal processing to suppress a component of a disturbance vibration contained in a vibration measured at a prescribed location in the pipeline, an acquiring unit that acquires distribution information that is associated with a characteristic of the pipeline and represents an actual distribution result of a value of a parameter in the adaptive signal processing when performance of suppressing the component of the disturbance vibration satisfies a criterion; an estimating unit that, based on the distribution information, estimates a probability density at which the value of the parameter with which the performance satisfies the criterion exists; and a determining unit that, based on the probability density estimated by the estimating unit, determines a range to search for the value of the parameter in the adaptive signal processing.

Fluid leakage diagnosing device, fluid leakage diagnosing system, fluid leakage diagnosing method, and recording medium storing fluid leakage diagnosing program

A leakage inspection device according to an aspect of the present disclosure includes: at least one memory storing a set of instructions; and at least one processor configured to execute the set of instructions to: determine a measurement time; measure vibration waveforms for the measurement time by using at least two sensors set to a pipe; calculate a cross-correlation function of the measured vibration waveforms; detect peaks of the cross-correlation function at least twice in the measurement time; and determine that leakage occurs in a case where the peaks are repeatedly detected in the measurement time.

Leakage inspection device, leakage inspection method, and storage medium

Signal measurement units each measure a signal output from a sound source, as a measured signal. Reference signal acquisition units each acquire a reference signal. A weighting processing unit creates weighted reference signals by weighting the reference signals. A time synchronization correction calculation unit calculates a time synchronization correction value based on the weighted reference signals. The time synchronization correction value is a correction value for synchronizing the two measured signals. An arrival time difference calculation unit calculates an arrival time difference based on the time synchronization correction value. The arrival time difference is a difference between elapsed times for the two measured signals acquired by respective ones of the pair of signal measurement units to arrive at the respective ones of the pair of signal measurement units. A sound source position calculation unit calculates a position of the sound source based on the arrival time difference.

Sound source position detection device, sound source position detection method, sound source position detection program, and recording medium

This invention provides the following: a diagnostic device that may, with a simple design, diagnose the condition of a wide area of a structure such as a pipe; and the like. The diagnostic devicehas a determining means for determining the condition of the structure on the basis of the speed of sound therein.

Diagnostic device, diagnostic system, diagnostic method, and computer-readable recording medium

Provided are a position determination device and the like which determine vibration measurement positions for specifying a leak position. A position determination deviceincludes a feature amount extraction unit which extracts feature amounts relating to detected pipe vibrations respectively on the basis of the pipe vibrations detected by a plurality of detection units, and a measurement position determination unit which determines measurement positions of at least two of the detection units on the basis of the feature amounts.

Position determination device, leak detection system, position determination method, and computer-readable recording medium

Provided are a position determination device and the like for determining a mounting position of a sensor suitable for detecting leakage vibration of a pipe. A position determination device () includes a frequency determination unit for determining a frequency of vibration propagating through a pipe and a structure attached to the pipe and a mounting position determination unit for determining, on the basis of the determined frequency, a mounting position of a sensor for detecting vibration of the pipe.

Position determination device, position determination system, position determination method, and computer-readable recording medium

Each functional configuring unit of a leak inspection device () operates in the manner that follows. A vibration acquisition unit () acquires a signal indicating tubing vibrations or vibrations propagated from tubing. A filtering unit () extracts a signal of a predetermined frequency band from the signal acquired by the vibration acquisition unit (). A characteristic value extraction unit () splits the signal extracted by the filtering unit () into predetermined time intervals, calculates for each split signal the absolute value of each extreme value of the magnitude of the signal, performs for each split signal a statistical process with respect to the calculated plurality of absolute values, and considers values calculated by the statistical process to be characteristic values. A leak determination unit () considers inspection results to indicate the presence of a leak when a determination index value stipulated using the characteristic values is greater than a predetermined threshold.

Leak inspection device, leak inspection method, and leak inspection program

A sensor device includes: a first sensor group () in which a plurality of first vibration sensors for detecting vibration acceleration in one direction with respect to an object to be detected are arranged to face the same direction; a phase difference calculation unit () which, based on a plurality of first signals indicating the vibration acceleration detected by each of the plurality of first vibration sensors included in the first sensor group (), calculates a first phase difference indicating the phase difference between the plurality of first signals; and an acceleration calculation unit () which, using the first phase difference and the plurality of first signals, calculates vibration acceleration in a first direction perpendicular to a surface on which the plurality of first vibration sensors are arranged, and vibration acceleration in a second direction parallel to the surface on which the plurality of first vibration sensors are arranged.

Sensor device, vibration detection system, sensor unit, information processing device, vibration detection method, and program

A sensor unit () provided with a substrate (), a plurality of light-receiving units () that are provided on the substrate () and detect light, and a diffraction grating layer () that is provided on the substrate () and the light-receiving units () and has at least two diffraction means for diffracting light of corresponding wavelengths and condensing the light onto the light-receiving units, wherein at least two of the diffraction means are composed from holograms formed on a first diffraction grating layer and at least a portion of the plurality of holograms formed on the first diffraction grating layer overlap at least partially with another adjacent hologram.

Sensor unit

A viscoelastic body is interposed between a vibrating membrane vibrating in association with a piezoelectric vibrator composed of a piezoelectric element and a base and a support member supporting the vibrating membrane. The viscoelastic body attenuates vibration transmitted from the support member to the vibrating membrane and converts vibration of the vibrating membrane in the surface direction parallel to its main surfaces to vibration of the vibrating membrane in the direction nearly perpendicular to the surface direction. The vibrating membrane is annular with an opening at the center, and the base is joined to the vibrating membrane coaxially with opening.

Actuator, piezoelectric actuator, electronic device, and method for attenuating vibration and converting vibration direction

Provided is an infrared ray sensor that can conduct a plurality of different types of detection such as temperature detection and gas detection in a simple structure and that is small size and low cost. The infrared ray sensor () includes, on one base (), a first infrared ray detection unit () including at least one infrared ray detection element () including an infrared ray detection material () with physical properties changing depending on properties of incident infrared rays and receives and detects ambient infrared rays, and a second infrared ray detection unit () including at least one infrared ray detection element () having an identical element structure to the infrared ray detection element of the first infrared ray detection unit (), is irradiated with infrared rays X for measurement having specific physical properties, and detects a change in the physical properties of the infrared rays X for measurement.

Growing community of inventors

Tokyo, Japan

Junichiro Mataga