Automatic Feature Detectionand Data Comparison of Laser-inspected Smooth-Bore Gun Tubes and Pipes

1. LaserViewer™ Analysis Software with Automated Reporting
For
BEMIS™ Laser-based Bore Erosion Measurement and Inspection Systems:
21 Aug 2013
1
Automatic Feature Detection
and Data Comparison
of Smooth-Bore Gun Tubes and Pipes

2. Background
• LTC clients seek increased autonomy from BEMIS™ Laser-
based Bore Erosion Measurement Inspection Systems
• Initial application designed for use with smooth-bore gun
tubes and pipes
• LTC LaserViewer™ Analysis program runs on commercial
PCs
• Analyzes LTC proprietary Scan Data (.sdt) format
• Automates reporting of individual pits and total volumetric
material loss of a laser-mapped sample based on operator
selectable criteria
2

3. BEMIS™
• Scans the interior surface of pipes and tubes
• Saves the data for further analysis
3

4. Machined Defects used as
Verification Samples
4
Scan Data as shown in LaserViewer™ Analysis AFD
120mm Diameter Samples

5. Pit Depth Analysis
BEMIS™ Measures a machined pit 8mm deep
5

6. BEMIS™ Automatic Feature Detection Software is able to identify and calculate
the real size of a feature area.
The correct borderline is detectable according to the difference between the
“good” surrounding surface and the deeper “defective” surface.
LTC Pit Detection Example
Flagged as Feature #50
7
Pit Depth Analysis
Area and Volume Identification

7. LTC Pit Detection Examples
Flagged as Numbered Features from Scan Data file (.sdt)
8
Pit Depth Analysis
Area and Volume Identification

8. Size and Volume Calculation
LTC AFD Report
9
Displayed in the AFD Workspace
Exportable to MS Excel

9. Size and Volume Calculation
Sample 1
LTC AFD Report (MS Excel) Segment Volume Tab
10
Defect Peak Average Area X Start Y Start X End Y End X Length Y Length Start Sector End Sector Volume Segment Range Clock Position Volume
D1 7.55 5.00 353.0 113.8 6.2 132.4 29.5 18.5 23.3 8 9 1766.26 1 0-30 1200-0100 0.00
D2 5.70 3.76 305.4 84.6 6.5 101.2 28.7 16.6 22.3 6 7 1148.70 2 15-45 0030-0130 152.20
D3 3.82 2.58 228.0 55.4 8.0 70.0 27.5 14.5 19.5 4 5 589.27 3 30-60 0100-0200 137.42
D4 1.95 1.53 99.7 28.6 11.5 37.4 25.0 8.8 13.5 2 2 152.20 4 45-75 0130-0230 589.27
D5 5 60-90 0200-0300 460.89
D6 6 75-105 0230-0330 1148.70
D7 7 90-120 0300-0400 859.62
D8 8 105-135 0330-0430 1766.26
D9 9 120-150 0400-0500 1302.97
D10 10 135-165 0430-0530 0.00
D11 11 150-180 0500-0600 0.00
D12 12 165-195 0530-0630 0.00
D13 13 180-210 0600-0700 0.00
D14 14 195-225 0630-0730 0.00
D15 15 210-240 0700-0800 0.00
D16 16 225-255 0730-0830 0.00
D17 17 240-270 0800-0900 0.00
D18 18 255-285 0830-0930 0.00
D19 19 270-300 0900-1000 0.00
D20 20 285-315 0930-1030 0.00
D21 21 300-330 1000-1100 0.00
D22 22 315-345 1030-1130 0.00
D23 23 330-360 1100-1200 0.00
D24 24 345-15 1130-0030 0.00
Segment Volume TotalsDefects List

10. 11
Size and Volume Calculation
LTC AFD Report (MS Excel) Plot Tab
Plot Tab

11. LTC Pit Detection Examples
Flagged as Numbered Features
LTC LaserVideo™
Features do not flag in LVI
12
Size and Volume Calculation
Automatic Feature Identification

12. The Automatic Feature Detection software exports position, length, width,
depth and volume of the automatic detected area according to operator-
selectable criteria.
Report in LaserViewer™ Analysis AFD MS Excel Exported Data
13
Data Export Functionality
LTC AFD Report and MS Excel Plot Tab

13. Operators can select a grid overlay display with fixed sizes between distances. The
grid is automatically adapting to every selected display scale factor of the scanning
data.
LTC Grid Overlay Example
14
Grid Overlay Functionality

14. Grid Overlay
15
Test Article 1

15. An overlay graphic of the smoke evacuator holes is available. The real dimension of the
smoke evacuator hole reference graphic is automatically adapted to every selected
display scale size. According to the manufacturing tolerances this overlay graphic is freely
moveable by the operator. all smoke evacuator holes refences can be arranged in a
single overlay graphic with an angle distance of 72° or each can be positioned
individually.
LTC Smoke Evacuator Reference 16
Get new images
LaserVideo™ Profile Scan
Smoke Evacuator Reference
Applicable for Gun Tubes

16. 5 smoke evacuator reference overlays separated by 72 degrees
LaserVideo™Laser Profile
17
Smoke Evacuator Reference
Applicable for Gun Tubes

17. Smoke evacuator hole reference
Before adjustment – full movement control and color selection
18

18. Smoke evacuator hole reference
19

19. Smoke evacuator hole reference (LVI™)
20

20. 21
Smoke evacuator hole reference
(Profile Scan)

21. Smoke Evacuator Holes
with local crop
22
Only area within “local crop” box
will be analyzed for defects

22. Only area below Smoke evacuators is
analyzed for defects
23

23. Report within AFD workspace
Area below smoke evacuator holes only
24

24. For missing volume calculation of defects the pipe or gun tube can be divided into equal
segments or calculated as a whole length.
25MS Excel Exported Data
Segment Volume Calculations

25. Operators can define fail criteria for the missing material volume
Sample Defect volume calculation 26
Segment Volume Calculations

26. The bore center axis remains constant throughout the complete barrel scan.
Deep defects in the surface do not influence the data or display.
Old Centering Processor New Centering Processor
27
Enhanced Centering Offset

27. The default resolution is set to
1024 x 768, but can be
rescaled by the operator
28
Actual Photo of Screen
Displaying 1024 x 768
Screen Display

28. Two sets of Scan Data (.sdt files) of the same barrel or pipe can be compared with
each other and overlaid. This allows comparison of different scan data of the same
barrel or pipe at different times. By using this functionality it is possible to display
the increasing defects according to time in service or the rounds fired in between
the two scans.
Machined Sample 1 –
Small Defects
Machined Sample 3 –
Larger Defects 29
Data Comparison

29. Scan Data Compare
Comparison between two machined articles
30
Difference Between Small and Large Defects
Data is nearly identical and
is displayed same as
background reference
Data is different and
is displayed as unique
colors and measurement
data
Tight color
palette used
to enhance
differences

30. Data Comparison Function
Information is exported to MS Excel
31
DefectsTab
Compare Datasets
The Compare Datasets function first builds a report of a single data file (most recent scan data) and then prompts you to select a
second data file (baseline – older scan data) for comparison.
The second file is compared to first as a “baseline” using the embedded date of the scan data.
The produced report contains 3 tabs Defects, Segment Volume Comparison and Plot.
The Defects tab consists of a side by side comparison of the defects found on both data files.
The Segment Volume Comparison tab lists the volume loss for each segment side by side as well as the difference in segment
volumes. The Plot tab tab consists of a graph plot of the difference in volume per segment.

31. Data Comparison
volumetric calculations between two data files
32
30-Jul-13 30-Jul-13
Defect Range Clock Position
Dataset 1 Segment
Volume
Dataset 2 (Baseline)
Segment Volume
Difference in Segment
Volumes
D1 0-30 1200-0100 0.00 0.00 0.00
D2 15-45 0030-0130 276.98 214.16 62.82
D3 30-60 0100-0200 252.87 192.19 60.68
D4 45-75 0130-0230 1010.88 784.68 226.21
D5 60-90 0200-0300 789.32 607.51 181.81
D6 75-105 0230-0330 1900.20 1494.60 405.60
D7 90-120 0300-0400 1424.38 1106.61 317.77
D8 105-135 0330-0430 2895.93 2326.16 569.77
D9 120-150 0400-0500 2134.14 1732.60 401.54
D10 135-165 0430-0530 0.00 0.00 0.00
D11 150-180 0500-0600 0.00 0.00 0.00
D12 165-195 0530-0630 0.00 0.00 0.00
D13 180-210 0600-0700 0.00 0.00 0.00
D14 195-225 0630-0730 0.00 0.00 0.00
D15 210-240 0700-0800 0.00 0.00 0.00
D16 225-255 0730-0830 0.00 0.00 0.00
D17 240-270 0800-0900 0.00 0.00 0.00
D18 255-285 0830-0930 0.00 0.00 0.00
D19 270-300 0900-1000 0.00 0.00 0.00
D20 285-315 0930-1030 0.00 0.00 0.00
D21 300-330 1000-1100 0.00 0.00 0.00
D22 315-345 1030-1130 0.00 0.00 0.00
D23 330-360 1100-1200 0.00 0.00 0.00
D24 345-15 1130-0030 0.00 0.00 0.00
test piece 3 GB.sdt test piece 2 GB.sdt

32. On the web: www.laser-ndt.com
Phone: (425) 885-0607
33
Contact us to learn more