3.6 Operation of B-Scan Interface
3.6.1 B-Scan Display
3.15 B-Scan Interface Diagram
1
—
Sound velocity 2
—
The minimum thickness range in B-scan 3
—
B-scan image display 4
—
Enter the numerical measurement interface
5
—
type of probes
6
—
gain value 7
—
Erasing the current B-scan
images and measurements
8
—
Interface wave-echo mode 9
—
The
maximum thickness value in B-scan 10
—
White pointer 11
—
The
minimum thickness value on the B-Scan image
12
—
Red triangle
(display the min. thickness value)
13
—
The thickness value of the
pointer position
14
—
Saved file number
3.6.2 Introduction of B-Scan
PM-5 series thickness gauge has time-base B-scan function. Move the
probe along the work piece surface, then the cross-sectional profile of
the work piece display, use for observe the underside contour of the
work piece.
When remove the probe from work piece, it could be automatically
capture a minimum value of the B-scan image, and indicate the position
of the minimum by a red triangle. You can see any point thickness value
of the B-scan image by moving the pointer.
3.7 Dual-Echo (Thru-Thin Coating) Mode
For the thin protect coating and paint, the thickness measurement of the
underlying metal will lead significant error when using conventional
thickness gauge. PM-5DL can accurate measure the actual thickness of
the underlying metal with dual-echo measurement principle and without
having to remove the coatings or destroy the surface process. This
function is achieved by measuring the two consecutive bottom echo of
base material.
Press
into parameter configuration interface, set the measurement
mode to dual-echo and press
again back to thickness
measurement interface. And then user can measure the thickness
through coating.
3.7.1 A-scan Interface In Dual-Echo Mode
The menu options on the right side have changed of A-scan interface
under echo-echo mode, added E-blanking option, and canceled GATE
option. The blue strips area indicate the length of echo-blanking when
measuring, the waveform above the blue strips is invalid. See following
figure
：
3.16 A-scan Interface in Dual-Echo Mode
1
—
Identification of dual-echo measurement mode
2
—
Blue arrow
indicate the secondary echo 3
—
E-blanking
4
—
Blue line: the length
of echo-blanking 5
—
Red line: the length of initial-blanking
6
—
Red
arrow indicate the first echo
19
20