This application is a National Stage Entry of PCT/JP2018/007717 filed on Mar. 1, 2018, which claims priority from Japanese Patent Application 2017-039109 filed on Mar. 2, 2017, the contents of all of which are incorporated herein by reference, in their entirety.

TECHNICAL FIELD

The present invention relates to a measurement time determination device, a sensing device, a measurement time determination method, and a computer-readable recording medium.

BACKGROUND ART

Piping that transports water, oil, gas, and the like may be used longer than a service life. Deterioration of piping may cause a leak of a fluid flowing inside the piping, a rupture of the piping, and the like. Thus, a technique for performing sensing and the like of a leak by measuring vibration (hereinafter referred to as “leak vibration”) generated due to the leak, and the like is considered.

PTL 1 describes a method of determining a leak position, and the like. The method described in PTL 1 extracts, by using a band-pass filter, leak vibration from a measurement value measured by a pair of vibration sensors and performs a cross-correlation function computation on the extracted pair of leak vibration.

CITATION LIST

Patent Literature

[PTL 1] Japanese Unexamined Patent Application Publication No. 2005-265663

SUMMARY OF INVENTION

Technical Problem

In the technique described in PTL 1, in piping installed in a place with loud noise, piping having a great installation interval between vibration sensors, and the like, a signal-to-noise ratio being a ratio of magnitude of vibration related to leak vibration to magnitude of noise may decrease. When the signal-to-noise ratio decreases, a long measurement time for vibration is needed for detecting a leak. Thus, the technique described in PTL 1 and the like require a technique for reducing a false judgment such as false negative in which it is judged as absence of a leak when the leak occurs, such as a technique of estimating a time necessary for detecting a leak.

The present invention is made in view of the above-mentioned problem, and a main object of the present invention is to provide a measurement time determination device and the like that reduce a false detection on leak detecting.

Solution to Problem

A measurement time determination device according to one aspect of the present invention includes a degree-of-ease calculation means for calculating degree-of-ease of detecting a leak in piping, based on vibration propagating through the piping or a fluid flowing through the piping when the piping is vibrated, and a determination means for determining a measurement time necessary for detecting the leak, based on the degree-of-ease.

A measurement time determination method according to one aspect of the present invention includes calculating degree-of-ease of detecting a leak in piping, based on vibration propagating through the piping or a fluid flowing through the piping when the piping is vibrated, and determining a measurement time necessary for detecting the leak, based on the degree-of-ease.

A computer-readable recording medium according to one aspect of the present invention non-temporarily stores a program causing a computer to execute processing of calculating degree-of-ease of detecting a leak in piping, based on vibration propagating through the piping or a fluid flowing through the piping when the piping is vibrated, and processing of determining a measurement time necessary for detecting the leak, based on the degree-of-ease.

Advantageous Effects of Invention

According to the present invention, a measurement time determination device and the like that reduce a false detection on leak detecting can be provided.

