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Thickness and Flaw Inspection Solutions

Near Field Distance of Flat Transducers in Water

Near Field Distance of Flat Transducers in Water

Frequency

Element Diameter

N

Focal Length (PTF)**

Min

Max

(MHz)

(inches)

(inches)

(inches)

(inches)

0.5

1.50

4.757

2.15

3.80

1.125

2.661

1.50

2.10

1.00

2.095

1.25

1.65

0.75

1.164

0.78

0.93

1.0

1.50

9.559

2.50

7.65

1.125

5.366

1.90

4.30

1.00

4.235

1.625

3.38

0.75

2.372

1.00

1.90

0.50

1.043

0.60

0.80

2.25

1.50

21.534

2.70

14.50

1.125

12.099

2.15

9.50

1.00

9.554

1.875

7.60

0.75

5.364

1.00

4.30

0.50

2.374

0.80

1.90

0.375

1.329

0.50

1.06

0.25

0.584

0.35

0.45

3.5

1.00

14.868

1.95

11.5

0.75

8.350

1.00

6.65

0.50

3.699

0.83

2.95

0.375

2.073

0.60

1.65

0.25

0.914

0.385

0.70

5.0

1.00

21.243

1.95

14.40‡

0.75

11.932

1.00

9.50

0.50

5.287

0.75

4.20

0.375

2.965

0.60

2.35

0.25

1.309

0.43

1.00

7.5

0.75

17.900

1.00

12.75‡

0.50

7.933

0.75

6.30‡

10

1.00

42.490

2.00

20.00‡

0.75

23.868

1.00

15.375‡

0.50

10.579

0.75

8.40‡

0.375

5.934

0.60

4.75‡

0.25

2.622

0.46

2.10

15

0.50

15.870

0.75

11.75‡

0.375

8.902

0.60

7.10‡

0.25

3.935

0.50

3.15‡

20

0.25

5.247

0.50

4.20‡

0.125

1.290

0.25

1.00‡

25

0.25

6.559

0.50

5.25‡

Frequency

Focal Length

MHz inches
5.0 13
7.5 6
10 3.5
15 1.5
20 0.8
25 0.5
30 0.4
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