Precise Measurements from Video

The LazrLyne projection optics are user adjustable. Changing the beam angle and focus allows for use with a wide range of camera optics and working distances. LazrLyne requires a bench calibration for each specific camera and lens to insure maximum accuracy, but once setup no re-calibration is necessary as long as the physical mounting angle is not altered. Multiple calibrations are stored in the system for different setups.

Measurement sensitivity is a function of the video field of view size, camera distance, and the steepness of the laser beam angle (a larger angle translates to greater movement of the stripe as range changes). The greatest scaling sensitivity is achieved when very close-up with a steep laser inclination angle. Measurement precision for very close range inspection can be as accurate as two to three mils.  Although the laser stripe is easily visible at distances up to several feet in normal indoor lighting, precision decreases rapidly as range increases.  A working range of no more than 24" is recommended for best results.

                 Height and Depth Offset Measurements

In addition to planar measurements of area and distance, LazrLyne facilitates accurate measurement of concave or convex surface features. (For example, the height of a weld bead or the depth of a corrosion pit.) When the LazrLyne stripe is positioned over a 3-D feature it will show a visible offset to the left or right. The operator then simply clicks and drags a measurement line across the stripe offset to measure the height or depth of the feature.

System Requirements

• C-Map's Mission Manager or VideoRuler system

·        Pentium class PC

·        NTSC or PAL Video Camera with fixed focal length lens.

• Laser Type:  Class IIIA solid-state diode
• Power Output:  5 mw (optional 10 or 15 mw diodes available)
• Power Input:  3 to 6 volts DC @ 75 ma
• Wavelength:  635 nanometers
• 80 degree fan line-generating optics
• Adjustable focus collimating lens
• Front surface mirror with adjustable angle mounting7/8" Diameter x 2-1/2" Length  moduleFront surface mirror with adjustable angle mounting

Mounting Considerations

Due to the wide variety of camera sizes and shapes in general use, C-Map Systems does not provide a standard mounting system for the LazrLyne module. Most users can construct a simple mounting bracket for their particular application, or C-Map Systems will design and build a custom mount upon request.

Calibration Requirements

The LazrLyne system requires an accurate "bench calibration" after installation or whenever physical setup or mounting of the laser module is altered.   This type of calibration is also necessary, whenever camera or lens characteristics change.  A calibration test pattern and step block is included with the system.

Measurement Precision

The degree of accuracy of measurements is a function of setup parameters, camera and lens characteristics, physical conditions, and quality of calibration. Measurement values quoted in this brochure are provided only as typical examples for a properly mounted and calibrated system. C-Map Systems makes no claims or guarantees concerning the precision of measurement attainable for any specific application.

Options

• Underwater housing for LazrLyne module
• 10 mw or 15 mw Class laser diode
• Custom laser-mounting hardware
• Lens distortion correction modules
• Fiber optic laser transmission and miniature optics for tight access applications
• Custom software for specific applications