Resonator device for enhancing output and sensitivity of guided wave transducers and the method of enhancement controlling

Patent metadata

Field	Value
Publication number	US-10732151-B2
Application number	US-201916592345-A
Country	US
Kind code	B2
Filing date	Oct 3, 2019
Priority date	Oct 5, 2018
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A transducer complex includes a resonator for enhancing an output and a measurement sensitivity of a guided wave transducer. The transducer complex includes: an ultrasonic transducer attached onto a surface or inserted into an object, the ultrasonic transducer having a longer length in parallel with the surface of the object than a length in a direction perpendicular to the surface of the object and the ultrasonic transducer receiving electric power from an external power source to generate ultrasonic waves or receiving ultrasonic waves from outside to generate electricity; and the resonator attached to the object or the ultrasonic transducer or inserted into the object, the resonator being symmetrically arranged in parallel on the outside of the ultrasonic transducer to be adjacent to the ultrasonic transducer.

First claim

What is claimed is:

1. A transducer complex comprising:
a resonator for improving an output and a measurement sensitivity of a guided wave transducer, wherein the transducer complex comprises:
an ultrasonic transducer attached onto a surface or inserted into an object, the ultrasonic transducer having a longer length in parallel with the surface of the object than a length in a direction perpendicular to the surface of the object and the ultrasonic transducer receiving electric power from an external power source to generate ultrasonic waves or receiving ultrasonic waves from outside to generate electricity; and
the resonator attached to the object or the ultrasonic transducer or inserted into the object, the resonator being symmetrically arranged in parallel on the outside of the ultrasonic transducer to be adjacent to the ultrasonic transducer,
wherein an output of the transducer complex satisfies Equation (1) below:

S
=

-

2
⁢

⁢

F
inp

EA
0

⁢

sin
⁢

⁢
kL

α
⁡

(

1
-

e

-
2

⁢
ikW

)

-

2
⁢
i

,

α
=

1

z
0

⁢

m
⁢

⁢
ω
⁢

⁢
s

s
-

m
⁢

⁢

ω
2

=

1

z
0

⁢

ω
⁢

⁢
s

ω
R
2

-

ω
2

(
1
)

(S: an output of the transducer complex, F inp : an exciting force of the transducer, E: rigidity of the object, A 0 : a cross-sectional area of the object, k: wave number, L: half a width of the transducer, W: a distance between the transducer and the resonator, m: a mass value of the resonator, ω: angular frequency, s: a spring constant of the resonator, z 0 : a mechanical impedance of the object, ω R : a resonant angular frequency of the resonator).

2. The transducer complex of claim 1 , wherein
the ultrasonic transducer generates the ultrasonic waves or generates electricity by receiving the ultrasonic waves from outside in one of a magnetostriction method, a piezoelectric method, and an electromagnetic acoustic method.

3. The transducer complex of claim 2 , wherein
a cross-section of the resonator comprises a central beam that is in parallel with a surface of the ultrasonic transducer that is arranged in parallel with the surface of the object, and two support portions connected to opposite ends of the central beam and arranged in a direction perpendicular to the surface of the ultrasonic transducer that is arranged in parallel with the surface of the object, and
the spring constant (s) of the resonator is calculated by measuring an extended length after applying a force to the central beam of the resonator in a direction in parallel with the surface of the object and perpendicular to a lengthwise direction of the central beam in a state in which the resonator is fixed onto the object, and the mass value (m) of the resonator is calculated by Equation (2) below,

m

Assignees

• Seoul Nat Univ R&Db Foundation
• Ct Advanced Meta Mat

Inventors

• Kim Yoon Young
• Kim Ki Yean

Classifications

• G01N29/42 Primary

  by frequency filtering {or by tuning to resonant frequency} · CPC title

• G01N29/2412

  using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]; (investigating the presence of flaws using eddy currents G01N27/90, magnetostrictive transducers B06B1/08, measuring magnetostrictive properties G01R33/18) · CPC title

• G01N29/24 Primary

  Probes {(transducers for acoustic waves B06B, G10K; for measuring G01H)} · CPC title

• G01N29/348

  with frequency characteristics, e.g. single frequency signals, chirp signals (measuring frequency of mechanical vibrations or acoustic waves in general G01H1/06, G01H3/04; measuring frequency or analysing frequency spectra G01R23/00) · CPC title

• G01N29/2437

  Piezoelectric probes · CPC title