The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1997
Filed:
Oct. 27, 1995
Masano Hayashi, Tokyo, JP;
Masatoshi Kimura, Tokyo, JP;
Kaoru Motegi, Tokyo, JP;
Jiro Tsuchikawa, Kawaguchi, JP;
Masayuki Hirose, Tokyo, JP;
Koudo Taya, Tokyo, JP;
H & B System Inc., Tokyo, JP;
Imperial Consultant Inc., Tokyo, JP;
Abstract
By arranging a pair of an ultrasonic wave transmitting sensor and an ultrasonic wave receiving sensor in opposition across a crack in a reinforced concrete construction. An ultrasonic wave is transmitted from the ultrasonic wave transmitting sensor at a first position. A reflected wave is then received by the ultrasonic wave receiving sensor at the first position. Also, the ultrasonic wave is transmitted from the ultrasonic wave transmitting sensor at a second position. A reflected wave is then received by the ultrasonic wave receiving sensor at the second position. The received waves at two positions are provided mutual phase shift for a predetermined period and summed in reversed phase for deriving a rise time of the wave reflected from the crack. By this, even when reinforcement is arranged in the concrete, the noise component superimposed on the received wave due to presence of the reinforcement can be eliminated to permit high precision measurement of the depth of the crack irrespective of the presence of the reinforcement at high density.