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Development of a full waveform digital sonic tool and its field application; Full wave onpa kenso sochi no kaihatsu to genchi tekiyo

Abstract

Full waveform digital sonic tool (OYO) has been developed for the purpose of accurately measuring geophysical anomalies in the rockbed containing cracks, and its performance is evaluated by comparing its measurements with those obtained by the conventional sonic logging device (DBM). Modification involves the following. While gain is fixed in the DBM, it is variable in a times10-times200 range in the OYO. Analog transfer:ground surface A/D in the DBM is replaced by digital transfer:intra-probe A/D in the OYO. In the DBM, only a special program running on the MS-DOS can analyze waveform data but, in the OYO, waveforms are recorded in the SEG-Y format enabling the import of the data into generally available waveform processing software. In the OYO, a high-speed communication board is incorporated into the probe, which realizes high-speed communication. There is a very excellent agreement between the two in P-wave velocity distribution as reckoned from the initial run. Regarding the OYO, however, it is pointed out that gain control be performed with the greatest care to prevent waveforms from distortion. 5 figs.
Authors:
Inazaki, T; [1]  Kurahashi, T; [2]  Goebuchi, T [3] 
  1. Geological Survey of Japan, Tsukuba (Japan)
  2. Public Works Research Institute, Tsukuba (Japan)
  3. OYO Corp., Tokyo (Japan)
Publication Date:
Oct 22, 1997
Product Type:
Miscellaneous
Report Number:
ETDE/JP-98751022; CONF-9710214-
Reference Number:
SCA: 150301; PA: JP-97:0G4583; EDB-98:072612; SN: 98001944519
Resource Relation:
Conference: 97. SEGJ conference, Butsuri tansa gakkai dai 97 kai (1997 nendo shuki) gakujutsu koenkai, Sapporo (Japan), 22-24 Oct 1997; Other Information: PBD: 22 Oct 1997; Related Information: Is Part Of Proceeding of the 97th (Fall, Fiscal 1997) SEGJ Conference; PB: 371 p.; Butsuri tansa gakkai dai 97 kai (1997 nendo shuki) gakujutsu koenkai koen ronbunshu
Subject:
15 GEOTHERMAL ENERGY; SONIC LOGGING; CRACKS; DETECTION; ROCKS; PHYSICAL PROPERTIES; GAIN; ANALOG SYSTEMS; DATA TRANSMISSION; DIGITAL SYSTEMS; WAVE FORMS; EXPERIMENTAL DATA; COMPUTER CODES; PROBES; SEISMIC P WAVES; VELOCITY
OSTI ID:
622757
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98751022; TRN: JN97G4583
Availability:
Available from Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, (Japan); OSTI as DE98751022
Submitting Site:
NEDO
Size:
pp. 317-320
Announcement Date:

Citation Formats

Inazaki, T, Kurahashi, T, and Goebuchi, T. Development of a full waveform digital sonic tool and its field application; Full wave onpa kenso sochi no kaihatsu to genchi tekiyo. Japan: N. p., 1997. Web.
Inazaki, T, Kurahashi, T, & Goebuchi, T. Development of a full waveform digital sonic tool and its field application; Full wave onpa kenso sochi no kaihatsu to genchi tekiyo. Japan.
Inazaki, T, Kurahashi, T, and Goebuchi, T. 1997. "Development of a full waveform digital sonic tool and its field application; Full wave onpa kenso sochi no kaihatsu to genchi tekiyo." Japan.
@misc{etde_622757,
title = {Development of a full waveform digital sonic tool and its field application; Full wave onpa kenso sochi no kaihatsu to genchi tekiyo}
author = {Inazaki, T, Kurahashi, T, and Goebuchi, T}
abstractNote = {Full waveform digital sonic tool (OYO) has been developed for the purpose of accurately measuring geophysical anomalies in the rockbed containing cracks, and its performance is evaluated by comparing its measurements with those obtained by the conventional sonic logging device (DBM). Modification involves the following. While gain is fixed in the DBM, it is variable in a times10-times200 range in the OYO. Analog transfer:ground surface A/D in the DBM is replaced by digital transfer:intra-probe A/D in the OYO. In the DBM, only a special program running on the MS-DOS can analyze waveform data but, in the OYO, waveforms are recorded in the SEG-Y format enabling the import of the data into generally available waveform processing software. In the OYO, a high-speed communication board is incorporated into the probe, which realizes high-speed communication. There is a very excellent agreement between the two in P-wave velocity distribution as reckoned from the initial run. Regarding the OYO, however, it is pointed out that gain control be performed with the greatest care to prevent waveforms from distortion. 5 figs.}
place = {Japan}
year = {1997}
month = {Oct}
}