Contactless Laser Extensometers

  • Model LE-05 and LE-15 extensometers measure strain optically, without contacting the specimen, using laser diode technology. The extensometers are self-contained and portable. They may be interfaced with a variety of testing machines and data acquisition systems using the ±10V analog output or bi-directional RS-232 serial port. Operation may be local or remote. A digital display is included. The scanning beam is always perpendicular to the specimen, unlike most laser extensometers. This eliminates errors when viewing through windows in chambers. It also minimizes sensitivity to the distance between the extensometer and the sample. Because the unit measures reflected light, no receiver is required behind the sample.

  • Non-contacting optical design requires only reflective tape marks on the specimen, or clip-on reflectors.
    Ideal for use in chambers-calibration not affected by aiming through viewing windows.
    High resolution of 1 micron.
    Full 127 mm (5 inch) or 381 mm (15 inch) measuring range allows high elongation measurements (e.g. 200% on a 25 mm gauge length).

  • Consult factory for options like reflective clips for high temperature use ¹Over optimum displacement range at calibrated distance
    Note: Specifications measured at 25℃ and 50% relative humidity

  • Measurement Range:

    LE-05: 8 to 127 mm (0.3 to 5 inches); LE-15: 8 to 381 mm (0.3 to 15 inches)

    Max. Resolution:

    LE-05: 0.001 mm (0.0001 inches); LE-15: 0.01 mm (0.001 inches)

    Linearity¹:

    LE-05: ±0.01 mm (±0.0004 inches); LE-15: ±0.04 mm (±0.002 inches)

    Repeatability¹:

    LE-05: ±0.005 mm (±0.0002 inches); LE-15: ±0.04 mm (±0.002 inches)

    Max. Scan Rate:

    100 scans/second

    Target Distance:

    Two selectable factory preset values between 254 and 457 mm (10 and 18 inches)
    Default values are:
    LE-05: 305 and 381 mm (12 and 15 inches)
    LE-15: 381 and 457 mm (15 and 18 inches)

    Zero Suppression:

    Reading may be set to zero anywhere in measuring range

    Scan Line Orientation:

    Vertical

    Scan Averaging:

    Moving window averaging over a selectable number of scans

    Analog Output:

    16 bit, ±10 VDC standard

    Full Scale Ranges:

    0.1, 0.2, 0.5, 1.0, 2.0, 5.0, 10.0, or 20.0 inches
    (model dependent) Optional 2.0, 5.0,10, 20, 50, 100, 200, or 500 mm
    (model dependent)

    Digital Communications:

    RS-232 serial communications, standard 3 wire

    Selectable Baud Rate:

    9600, 4800, 2400, or 1200

    Display:

    2 line, 16 character digital display, backlit LCD

    Power Input:

    115 VAC ±10%, 50/60 Hz standard
    230 VAC ±10%, 50/60 Hz optional

    Size:

    LE-15: 668 L x 457 H x 196 W mm (27 L x 18 H x 7.7 W inches)

    Weight:

    LE-05: 4.5 kg (10 lbs), LE-15: 20.4 kg (45 lbs)

    Mounting Provisions:

    1/4-20 UNC tapped holes in base (4)

    Laser Source:

    Diode laser, 670 nm, CDRH Certified Class II laser instrument


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These extensometers are high precision non-contacting units for strain measurement in materials testing. They use a high speed laser scanner to measure the spacing between reflective tape strips on the sample. The measurement range is from 0.3 to 5 inches (8 to 127 mm) on the LE-05 and 0.3 to 15 inches (8 to 381 mm) on the LE-15. The gauge length is determined by the user. This allows high elongation measurements when shorter gauge lengths are used. The high resolution also allows accurate measurements of smaller strains.
Gauge Lengths:
User selectable
Measuring Ranges:
User selectable
Temperature Range:
Ambient to 425℃
Key Features:
Non-contacting