# US 9,435,769 B2 · Ultrasonic testing sensor and ultrasonic testing method

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- Number: US 9,435,769 B2
- Document ID: US9435769B2
- Status: Granted
- Kind: B2
- Application number: 14/531,233
- Filed: 2014-11-03
- Published: 2015-05-07
- Granted: 2016-09-06
- Earliest claimed: 2013-11-07
- Assignees: Mitsubishi Hitachi Power Systems, Ltd.
- Applicants: Mitsubishi Hitachi Power Systems, Ltd.
- Inventors: Yutaka Suzuki; Hiroaki Chiba; Takeshi Kudo
- Web page: https://patentgrep.com/patent/US9435769B2

## CPC

- G01N 29/265: by moving the sensor relative to a stationary material
- G01N 29/043: {in the interior, e.g. by shear waves}
- 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)}
- G01N 29/262: {by electronic orientation or focusing, e.g. with phased arrays (phased arrays per se G10K11/34)}
- G01N 2291/044: Internal reflections (echoes), e.g. on walls or defects
- G01N 2291/102: one emitter, one receiver
- G01N 2291/106: one or more transducer arrays
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## 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

### Claim 1

An ultrasonic testing method, comprising the steps of:
calculating a generation angle Δφ 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 Δφ 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.

### Claim 2 (depends on 1)

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