~

Ultrasonic20K/cps

-(transducer)

-

-(wave speed)(attenuation)

()

()

()

()

-

.

T/R

transducer(Panametrics V389 )

Sample

Guide

LECROY LT-342

Ultrasonic pulser/receiver(Panametrics 5058PR)

PC

Ultrasonic measurement system

-

.

Water

Sponge

T/R

0.5MHz transducer (Panametrics V389 )

Sample

Guide

LECROY LT-342

Ultrasonic pulser/receiver(Panametrics 5058PR)

PC

Underwater ultrasonic measurement system

Water tank

Digital Oscilloscopes

LECROY 9304A200MHz

PANAMETRICS 5058PR

Volt signal (mV)

V1(1)

V2(2)

(3)

t 1 t 2 Time(s)

12

2tt

dC

=

C

EC =

= fC

peak to peak

peak to peak

)exp( xAA ox =

( )( )

=

xpp

opp

VV

xln1

neper/m

peak topeakvolt

peak to peakvolt

meter

( )opp

V

( )xpp

V

x

Parsevals theorem

= dFdttf 22 )()(

Haugh1993

Sarkar and Wolfe1983

Mizrach1989

50kHz500kHz

Finney1968

224 LfE =

Vb E=

Vd )21)(1()1(

+

= E

Garrett &Furry(1972)

Mizrach1998

spectral analysis

Upchurch et al.1985

spectral analysis

Upchurch et al.1985

(Haugh, 1993)

,

FFT

)

(Haugh, 1993)

0.2

()

= 345.86 sg - 340.96R2 = 0.5721

0

5

10

15

20

25

30

0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.06

Specific gravity

Atte

nuat

ion

coef

ficie

nt (n

eper

/m)

Regression analysis of specific gravity vs. attenuation coefficient for fresh samples

CCD

8

10

12

14

16

18

20

0 5 10 15 20 25 30

Attenuation coefficient (neper/m)

Brix

(%)

line of disorder

Evaluating disorder line of Chiin Hwang mango

by attenuation coefficient for ultrasonic echo technology

0

5

10

15

20

25

30

-5 0 5 10 15 20 25 30 35 40 45

Young's modulus(Kg/cm2)

Atte

nuat

ion

coef

ficie

nt(n

eper

/m)

The distribution of attenuation coefficient and Youngs modulus by 0.5MHz underwater ultrasonic

766mV 1656mV20.9 neper/m 8.1 neper/m

Mo =0.082 Mo =0.392

(Zhang et al.,1994

(Zhang et al.,1994

(Zhang et al.,1994

FFT

(Zhang et al.,1994

FFT

65

56 (arrow)

,()( distended left anterior talofibular

pouch )

(RT)(EU)(MT)(LT)(UT)(AE)

()

LASER-ULTRASONICS()

(couplant)EMAT(capacitive)(air-coupled)(laser-ultrasonics)(LUT)

LASER-ULTRASONICS()

LASER-ULTRASONICS()

()