Abstract:
A vibration detection device (10) is provided with a vibration detection unit (110), a sensor-side leak determination unit (120), a first transmission unit (130), and a second transmission unit (140). The vibration detection unit (110) detects vibration transmitted through piping (30). The sensor-side leak determination unit (120) determines whether or not there is a possibility of a leak in the piping (30) based on a measurement result of the vibration detection unit (110). When the sensor-side leak determination unit (120) determines that there is a possibility of a leak, the first transmission unit (130) transmits provisional leak information to an information processing device (20). The provisional leak information indicates that there is a possibility of a leak in the piping (30). When waveform request information indicating a request for waveform data of the vibration is received from the information processing device (20), the second transmission unit (140) transmits waveform data measured by the vibration detection unit (110) to the information processing device (20).
Abstract:
In a related fluid leakage detecting device, erroneous leakage determination may occur due to a change in a state of a fluid in piping.A leakage determination system of the present invention includes a first detection means for detecting a prescribed physical quantity indicating a state of a fluid in piping, a second detection means for detecting vibration propagating through the piping, and a leakage determination means for performing leakage determination based on the physical quantity detected by the first detection means and the vibration detected by the second detection means.
Abstract:
Provided is a position estimation device and the like which accurately estimate an occurrence position of a pressure wave. The position estimation device is provided with: a first cross-correlation derivation means for deriving a first cross-correlation relating to a pressure of fluid based on measurement values obtained by measuring a pressure of fluid flowing through a pipeline network at least at two positions in the pipeline network, a second cross-correlation derivation means for deriving a second cross-correlation relating to a pressure of fluid based on calculation values obtained by calculating a pressure of fluid at least at the two positions in the pipeline network, and an estimation means for estimating an occurrence position of a pressure wave based on a difference between the first cross-correlation and the second cross-correlation.
Abstract:
To provide a measuring device wherein a measurement range corresponding to a wave shape to be measured can be set with a simple configuration. A measuring device (100) has: a measuring unit that measures changes of indexes with time, said indexes relating to an object event; a conversion unit that converts a measurement value measured by means of the measuring unit into a predetermined format within a previously set measurement range; and a control unit that controls the measurement range. The control unit changes the measurement range in the cases where a conversion value obtained by converting the measurement value by means of the conversion unit satisfies predetermined conditions in a predetermined period.
Abstract:
A sensor unit (100) provided with a substrate (101), a plurality of light-receiving units (102) that are provided on the substrate (101) and detect light, and a diffraction grating layer (103) that is provided on the substrate (101) and the light-receiving units (102) 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.