Title:
SPEED-OF-SOUND CALCULATION DEVICE, SPEED-OF-SOUND CALCULATION METHOD, AND SPEED-OF-SOUND CALCULATION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2015/141129
Kind Code:
A1
Abstract:
A first vibration detector (110A) detects a first vibration (W10) propagating through a structure (e.g., a pipe (900)). A second vibration detector (110B) detects a second vibration (W20) propagating through the structure. A rising time difference calculation unit (121) calculates a rising time difference (∆t) that is the difference between a first rising time (ta) at which the first vibration (W10) rises and a second rising time (tb) at which the second vibration (W20) rises. A correlation function calculation unit (122) calculates a correlation function for the first vibration (W10) and the second vibration (W20). A speed-of-sound calculation unit (123) calculates the speed of sound (c) for the structure on the basis of the correlation function, the rising time difference (∆t), and the distance (D) between the first vibration detector (110A) and second vibration detector (110B). As a result, the speed of sound of a structure (e.g., a pipe (900)) can be more accurately calculated.
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Inventors:
MATAGA JUNICHIRO (JP)
TAKAHASHI MASATAKE (JP)
TOMINAGA SHIN (JP)
INOUE HIROFUMI (JP)
TAKAHASHI MASATAKE (JP)
TOMINAGA SHIN (JP)
INOUE HIROFUMI (JP)
Application Number:
PCT/JP2015/000759
Publication Date:
September 24, 2015
Filing Date:
February 18, 2015
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
G01H5/00; G01M3/24
Foreign References:
| JPH11201812A | 1999-07-30 | |||
| JPH11201858A | 1999-07-30 | |||
| JPS60252225A | 1985-12-12 | |||
| JP2001004606A | 2001-01-12 |
Attorney, Agent or Firm:
SHIMOSAKA, NAOKI (JP)
Naoki Shimosaka (JP)
Naoki Shimosaka (JP)
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