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US 6,672,162 B2Granted
Ultrasonic detection apparatus and ultrasonic detection method employing the same
AssigneeH & B System Co., Ltd.
InventorMasayuki Hirose
Life of this patent
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AssigneeH & B System Co., Ltd.
InventorMasayuki Hirose
Estimating the term…
While a transmitting transducer (2a) for transmitting an ultrasonic wave and a receiving transducer (2b) for receiving an ultrasonic wave are moved within a predetermined circular region (7) on a surface of a material being measured, ultrasonic waves are transmitted and received 10,000 times. Then, arithmetic averaging is performed every time an ultrasonic wave is received, on the ultrasonic wave and ultrasonic waves that have been received until then. For example, the aforementioned predetermined frequency is given by ((n±(½))×(106×v/ΔL))(Hz), where ΔL is a variation in distance between the transmitting transducer and the receiving transducer, v is a transmission velocity of an ultrasonic wave transmitting in a material being detected, and n is a natural number. Consequently, it is possible to detect, with high accuracy, the thickness of a concrete material having a narrow width and a thick thickness, the thickness of the covering of a reinforcing bar and the diameter thereof, the depth of a crack and the like.
A ultrasonic detection apparatus wherein, in a measurement where, in a reinforced concrete structure having a plurality of reinforcing bars embedded in the concrete structure parallel to each other in a plane, letting a predetermined value of L be a distance between a transmitting transducer and a receiving transducer when the concrete structure has cracks on a surface thereof and letting another predetermined value of L be the distance when the concrete structure has no cracks, the transducers are arranged on the surface of the concrete structure to allow a line segment connecting between two transducers to be parallel to a longitudinal direction of the reinforcing bars, a received wave having the earliest time of generation is selected as a pertinent received wave from a plurality of received waves obtained by varying a position of said two transducers in the longitudinal direction of the reinforcing bars, and with a plurality of pertinent received waves obtained through the same measurement as the aforementioned one by varying a distance of said line segment by a given amount of Δx, a reinforcing bar is recognized to be present immediately under a measurement point of a received wave indicative of a maximum value of a curve connecting between times of generation of these waves.
An ultrasonic detection apparatus, wherein with pertinent received waves obtained from a measurement where, in a reinforced concrete structure having a plurality of reinforcing bars embedded in the concrete structure parallel to each other in a plane, when a sound velocity cVP in the concrete structure is unknown, letting a predetermined value of L be a distance between a transmitting transducer and a receiving transducer when the concrete structure has cracks on a surface thereof and letting another predetermined value of L be the distance when the concrete structure has no cracks, the transducers are arranged on the surface of the concrete structure to allow a line segment connecting between said two transducers to be parallel to a longitudinal direction of the reinforcing bars, an unknown quantity or the sound velocity cVP in the concrete structure and a depth d of an embedded reinforcing bar are simultaneously determined from the following simultaneous equations, t 11 = 2 d V p c × 1 cos θ + 1 V p s ( ( L - 2 d tan θ ) ) , t 12 = 2 d 2 + b 2 V p c × 1 cos θ + 1 V p s ( L - 2 d 2 + b 2 tan θ ) ) , and θ = sin - 1 V p c V p s where t 11
A method for detecting an ultrasonic wave wherein, in a measurement where, in a reinforced concrete structure having a plurality of reinforcing bars embedded in the concrete structure parallel to each other in a plane, letting a predetermined value of L be a distance between a transmitting transducer and a receiving transducer when the concrete structure has cracks on a surface thereof and letting another predetermined value of L be the distance when the concrete structure has no cracks, the transducers are arranged on the surface of the concrete structure to allow a line segment connecting between two transducers to be parallel to a longitudinal direction of the reinforcing bars, a received wave having the earliest time of generation is selected as a pertinent received wave from a plurality of received waves obtained by varying a position of said two transducers in the longitudinal direction of the reinforcing bars, and with a plurality of pertinent received waves obtained through the same measurement as the aforementioned one by varying a distance of said line segment by a given amount of Δx, a reinforcing bar is recognized to be present immediately under a measurement point of a received wave indicative of a maximum value of a curve connecting between times of generation of these waves.
A method for detecting an ultrasonic wave wherein with pertinent received waves obtained from a measurement where, in a reinforced concrete structure having a plurality of reinforcing bars embedded in the concrete structure parallel to each other in a plane, when a sound velocity cVP in the concrete structure is unknown, letting a predetermined value of L be a distance between a transmitting transducer and a receiving transducer when the concrete structure has cracks on a surface thereof and letting another predetermined value of L be the distance when the concrete structure has no cracks, the transducers are arranged on the surface of the concrete structure to allow a line segment connecting between said two transducers to be parallel to a longitudinal direction of the reinforcing bars, an unknown quantity or the sound velocity cVP in the concrete structure and a depth d of an embedded reinforcing bar are simultaneously determined from the following simultaneous equations, t 11 = 2 d V p c × 1 cos θ + 1 V p s ( ( L - 2 d tan θ ) ) , t 12 = 2 d 2 + b 2 V p c × 1 cos θ + 1 V p s ( L - 2 d 2 + b 2 tan θ ) ) , and θ = sin - 1 V p c V p s where t 11
Dependencies are inferred from the claim text.