Ultrasonic testing sensor and ultrasonic testing method

• US 9,435,769 B2
• Filed: 11/03/2014
• Issued: 09/06/2016
• Est. Priority Date: 11/07/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Chiba, Hiroaki, Suzuki, Yutaka, Kudo, Takeshi
• Primary Examiner(s): Patel, Harshad R
• Assistant Examiner(s): Shah, Samir M
• Application Number:
  US14/531,233
• Publication Number:
  US 20150122029A1
• Time in Patent Office: 673 Days
• US Class Current: 1/1
• CPC Class Codes: G01N 2291/044 Internal reflections (echoes), e.g. on walls or defects
• CPC Class Codes: G01N 2291/102 one emitter, one receiver
• CPC Class Codes: G01N 2291/106 one or more transducer arrays
• CPC Class Codes: G01N 29/043 in the interior, e.g. by shear waves
• CPC Class Codes: G01N 29/221 Arrangements for directing or focusing the acoustical waves electronic orientation or focusing G01N29/262; sound directing or focusing G10K11/26; mechanical steering of sound transducers or their beams G10K11/35
• CPC Class Codes: G01N 29/262 by electronic orientation or focusing, e.g. with phased arrays phased arrays per se G10K11/34
• CPC Class Codes: G01N 29/265 by moving the sensor relative to a stationary material

Abstract

The transmission sensor 1T and the reception sensor 1R are disposed so as to sandwich a testing target 301 therebetween. The reception sensor 1R receives a false signal arising from a GL generated upon ML scanning by a scanning angle equal to or greater than a minimum scanning angle Φmin but equal to or smaller than a maximum scanning angle Φmax.

Claims

1. An ultrasonic testing method, comprising the steps of:

calculating a generation angle Δ

φ

of a grating lobe;

evaluating, on the basis of a shape of a testing target and positions of a transmission sensor and a reception sensor with respect to the testing target, whether there exists a reflection source in a grating lobe generation direction;

measuring a reception position of a reflected wave by the reception sensor; and

comparing the reception position of the grating lobe based on the calculated generation angle Δ

φ and

the measured reception position of the reflected wave with each other to evaluate whether the reflected wave is a reflected wave of the grating lobe.

2. The ultrasonic testing method according to claim 1, further comprising the steps of:

transmitting a main lobe in the grating lobe generation direction; and

determining, when a reflected wave by the main lobe is measured at the reception position of the grating lobe based on the calculated generation angle Δ

φ

, that the reflected wave is noise by the grating lobe.