LTC Laser Profilometry


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Laser Techniqus Company revolutionizes the rifle barrel and gun tube inspection process with Laser-Based Sensors, BEMIS(TM) Bore Erosion Measurement Inspection System

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  • See manual p. 8 (Introduction) and LTC website ( for more information
  • See LTC website ( for application examples
  • See manual pp. 8-14 (Introduction) and LTC website ( for more information
  • See manual pp. 8-14 (Introduction) and LTC website ( for more information
  • (not in manual)
  • (not in manual)
  • LTC Laser Profilometry

    1. 1. Laser Profilometry Revolutionizing Gun Tube Inspections BEMIS™ - Bore Erosion Measurement and Inspection System Laser-based Inspections for 5.56mm to 155mm Weapon Bores DefenseSystems GroupDefenseSystems Group Mr. DanielBonnizzio, DirectorMr. DanielBonnizzio, Director
    2. 2. Laser Techniques Company MissionLaser Techniques Company Mission:: ““To provide our customers with laser-basedTo provide our customers with laser-based solutions to challenging measurement and inspectionsolutions to challenging measurement and inspection applicationsapplications......
    3. 3. ……to help ensure the safe operation and to extend theto help ensure the safe operation and to extend the useful life of high-value and safety-criticaluseful life of high-value and safety-critical components.”components.”
    4. 4. LTC’s laser-based inspectionLTC’s laser-based inspection technologytechnology • Industry leader in high- performance laser-based measurement and inspection systems • Over 20 years experience in development of systems for military and commercial applications • Systems employ standard architecture and “off-the- shelf” components 3D Image Segment of 155mm Gun Tub
    5. 5. Current Inspection Technology Borescope image of pitting
    6. 6. Inspection Technology Mechanical or Air Gauges and the Mark-1 Eyeball
    7. 7. Laser Profilometry: How it works
    8. 8. Laser Profilometry Revolutionizes the Inspection Process • Quantitative and Transportable Data • 3-Dimensional Data Cloud • Graphic Visualization of Data • Detailed and Customizable Reporting
    9. 9. Introduction to Laser Profilometry • Non-contact point measurement method • Sensor acts as a “laser caliper” • Produces a 3D map of the target surface • Inspection results displayed in 2D or 3D format. BEMIS-LC™ Large Caliber Sensor Scanning 155mm Gun Tube
    10. 10. Laser Profilometry Typical Applications • Detection and measurement of erosion, pitting, and corrosion • Tube diameter and ovality measurements • Dent measurement and inner surface imaging 3D Image Segment of 5.56mm Rifle Barre
    11. 11. Benefits of Laser Profilometry • Rapid, automated, non- contact measurement • Quantitative 3-D imaging • Removes Operator Subjectivity • May be integrated with other sensors – eddy current, ultrasound Quantitative 3D analysis of Origin of Rifling Erosion
    12. 12. Limitations of Laser Profilometry • Maps surface only; subsurface features can not be detected • Target surface must be clean and dry • Sharp features may cause shadows – loss of data • Specular (mirror-like) surfaces reflect light and require dedicated sensors
    13. 13. Introduction to Lasers • LTC primarily uses diode lasers • Diode laser features – Small package size – Low power draw – Long lifetimes – Available wavelengths: 400 nm – over 1000 nm – Available laser power: 3 mW – over 30 mW • For LP applications, LTC typically uses 650- 670 nm lasers, with maximum output <5 mW
    14. 14. SmartLaserTM • This system is equipped with SmartLaserTM laser safety mode. • When the sensor does not detect a surface in its measuring range, the laser pulses at a low average power at a rate of 10 Hz until a surface is detected. • The SmartLaser™ mode is automatically set to the ON position by the software.
    15. 15. Introduction Point Sensor Measurement Laser beam Test article (shown transparent) Scattered light Sensor Receiving Aperture
    16. 16. Introduction to Laser Profilometry Helical scanning Laser beam path on tube surface The sensor head rotates as it traverses down the tube
    17. 17. Introduction to Laser Profilometry 2D and 3D Data Display “Flat” display in LaserViewer™ “Wrapped” display in LaserViewer3D™
    18. 18. Laser Sensor Design Operating RangeStand off Diode Laser Module Focusing Lens Beam Waist (Minimum laser beam radius) (Useful laser beam radius)
    20. 20. LAND GROOVE LAND Laser Point Triangulation Laser Beam Measurement Points
    21. 21. Introduction to Laser Profilometry Profile Data and LaserVideo™ Image generated simultaneously LaserVideo ™ Laser Profilometry
    22. 22. Calibration • Factory-calibrated over the full sensor range using a precision stage • Sensor calibration verified with a precision ring by the user on a daily basis • Auto-calibration allows the user to adjust calibration for optimal accuracy
    23. 23. Calibration Precision Factory Calibration Calculated 4th order coefficient Measured sensor linearity Calibration curve
    24. 24. Calibration Stepped Calibration Ring 24 • Precision machined • Mechanically measured at third party NIST-certified facility • QC documentation provided to customer • Inner rings used to calibrate the detector Calibration Ring - 35mm
    25. 25. Sample Calibration Certification Sheet 25
    26. 26. Sensor Delivery System Large Caliber •LP-4210™ • Crawler • Scanner • Guide Tube Adapter • Calibration Ring • Barrel Clamp
    27. 27. Sensor Delivery System Medium Caliber LP-4210F™ • Data Acquisition • Motor Control – Scanner – Sensor Delivery Unit Sensor Delivery Unit •Drives the Scanner •Push-Pull Scanner • Centers the Sensor • Sensor rotates about Scanner center axis Guide Tube Adapter •Attaches to the Weapon Barrel •Also holds the Calibration Ring Connectors LP-4210F™ Instrument (Rear Panel) Sensor Connector Motor Connector Sensor Delivery Unit Scanning Assembly Guide Tube Adapter
    28. 28. Sensor Delivery System (Rigid) Medium Calibers LP-4210™ Instrument Sensor Delivery Unit Sensor Guide Tube Adapter
    29. 29. Sensor Delivery System Small Caliber Small Caliber Delivery Stages (5.56mm – 9mm) Close-up View of Sensor
    30. 30. LP-4210™ Data Acquisition and Control Unit (DAC) with Motor Control Unit (MCU)
    31. 31. • For use in Shop or Lab Conditions • Integrated Computer/Laser Sensor • External Motor Control Unit • Ethernet and USB data transfer • LaserViewer™ Software - Custom-configurable operator interface - Auto calibration • High-speed data acquisition LP-4210™ Data Acquisition and Control Unit (DAC)
    32. 32. LP-4210F™ Data Acquisition and Control Unit (DAC)
    33. 33. • For Use in Demanding Environments – Shock-mounted instrument chassis – Ruggedized Case • Integrated Computer/Laser Sensor and Motor Control Unit • Ethernet and USB data transfer • LaserViewer™ Software - Custom-configurable operator interface - Auto calibration • High-speed data acquisition LP-4210F™ Data Acquisition and Control Unit (DAC)
    34. 34. • LaserViewer™ Inspection • Installed on LP-4210™ / LP-4210F™ Data Acquisition Instrument • Easily adapted to customer needs • Designed for Capturing Scan Data and Initial Analysis • LaserViewer™ Analysis • Installed on a PC • Designed to Conduct Detailed Analysis of Scan Data • Modules Available for Specific Reporting Criteria • LaserViewer 3D™ • Installed on a PC • Three-Dimensional Visualization and Analysis Software • Bore Erosion Report Generator • Installed on a PC • Standard Reporting for Gun Bore Land and Groove Dimensions • Advanced Reporting for Twist rate, Groove Width, Runout LTC’s Laser-based Inspection Commercial Software SuiteLTC’s Laser-based Inspection Commercial Software Suite
    35. 35. LaserViewer™ System Setup Tab
    36. 36. LaserViewer™ System Calibration • Daily Calibration Provides Operator Indications System is Performing • Automatic Sequence • Adjustable to Specific Tolerances
    37. 37. Scan Parameters Rotary Speed: 1-300 RPM Scan Length: Up to the length of the barrel Linear Resolution: How often measurements are taken Other Parameters and Performance Data are calculated automatically This example will scan a 2cm section of tube, at 300 RPM every .1mm
    38. 38. Saving Data • Save functions allow the user to save scan data after it has been processed. • When saving processed data, only the processed subset is saved. • Processed data files are smaller than unprocessed files. • Processed data files are required for generating reports (if available).
    39. 39. Data Analysis • The Data tab displays saved data – Processors can be applied to the data – Can display: • Profile Data • LVI (LaserVideo™) Data • The Cross-Section tab shows – Cross-section plot – Profile data Data Type Selector
    40. 40. Color Plot The colors of the plot represent radii, and can be set by the color palette in the upper left side of the screen.
    41. 41. Applying Processors to a Scan Data File
    42. 42. Rotate Data Processor Rotating the data allows the user to change the location of unique features in order to compare scans at different rotary orientations. Initial Data Rotate Data applied
    43. 43. Remove Centering Offset Processor • In rotary systems, the data may show a sinusoidal offset along the rotary axis, with the maximum and minimum separated by 180 degrees. This is caused by centering offset. • The Remove Centering Offset processor adjusts the data centering on a line-by-line basis. • Useful for correcting variable centering errors throughout the scan. Remove Centering Offset applied Initial Data
    44. 44. Viewing Data • Area/Diameter Statistics – Statistics on a particular region of data on the Data tab may be calculated from the Statistics window. • Data Values and Making Point-to-Point Measurements • Cross-Sectional Auxiliary Windows • Display Annotations • Change the Color Palette
    45. 45. Processed Data – 155mm Gun Tube
    46. 46. Cross Section – 155mm Gun Tube • The Cross Section tab displays a scaled two-dimensional cross-section of the scan data.
    47. 47. LaserViewer 3D™ Visualization and Analysis Software
    48. 48. Bore Analysis Report Generator
    49. 49. Report Generator - Tabular Summary
    50. 50. Report Generator - Graphical Summary
    51. 51. BEMIS™ is used throughout the DoD and Defense Community • Yuma Proving Grounds • Aberdeen Proving Grounds • NSWC Dahlgren • Watervliet Arsenal • Benet Labs • USMC Log Base Barstow • Army Research Lab • BAE Systems • ATK • KMW • Dynamic Flowform • General Atomics • Foreign Militaries
    52. 52. Questions?