Electronic Instrument Research

Laser Extensometers
For Precision Non-Contact Strain Measurement
Measurement Ranges to 15 in. (380 mm)

Non-Contact Strain Measurement Devices

The LE Model Laser Extensometers are precision, wide-range instruments specifically designed for accurate, non-contact measurement of strain on various materials under tensile or compressive conditions. They may also be utilized for other applications where non-contact measurement is desired. The LE models are completely self-contained and are housed in a single compact enclosure. They take advantage of the latest laser technology in order to achieve high performance with minimal maintenance.

The Model LE Laser Extensometers provide: a digital display; 4 button keypad; analog output; and an RS-232 computer interface; all of which are located on the back panel. Instrument operation may be from the back panel or remote via the RS232 interface.

Although these instruments are designed to handle a wide range of measurement applications, the Model LE Laser Extensometers are easy to operate. They utilize a unique scanning laser beam technique to measure dimension changes from one side of the subject, eliminating the need for a scan receiver on the opposite side. For special applications requiring transmission around or through a specimen or other object, alternate methods can be implemented.

The LE Laser Extensometers are normally operated with the beam in a vertical plane but they can be operated in other planes as well. Target materials are available for various measurement applications.

Model LE Laser Extensometer


Measurement Range
0.3-3.2 in. (8-80 mm)
± 0.0002 in. (±0.005 mm)
0.0001 in. (0.001 mm)
0.3-5.0 in. (8-127 mm)
± 0.0004 in. (±0.010 mm)
0.0001 in. (0.001 mm)
0.3-15.0 in. (8-380 mm)
± 0.002 in. (± 0.05 mm)
0.001 in. (0.01 mm)
±0.0001 in. (±0.001 mm)
13" x 7.1" x 4.5"
10 lb. (4.5 kg)
±0.0002 in. (±0.005 mm)
15" x 7.1" x 4.5"
13 lb. (6 kg)
±0.002 in. (±0.05 mm)
27"D x 18"H x 7.7"W
48 lb. (22 kg)
System units:
Analog Output Ranges
2 line, 16 character/line, LCD Display with LED backlighting
In. or mm, selectable
16 bit, selectable range, ±10V full scale
0.1 , 0.2 , 0.5 , 1.0 , 2.0 , 5.0 ,10.0 , 20.0 inch full scale
2.0 , 5.0 , 10.0 , 20.0 , 50.0 , 100 , 100 , 500 mm full scale
Target Distance 10 in. nominal, 20 in. maximum, selectable
250 mm nominal, 500 mm maximum, selectable
Scan Rate 100 scans/second
Multiple Scan Averaging A moving window average is applied over a selectable number of scans to digitally filter the output reading.
RS232 I/O Port
Zero Suppression
Laser Source
Standard 3-wire type, selectable Baud rate (9600, 4800, 2400, 1200)
Reading can be zeroed anywhere within the full scale range of the instrument
670nm diode laser; <1mW maximum scanned output;
CDRH certified class II laser instrument
Power Input
115 VAC ±10%, 50/60 Hz (standard), 230 VAC ±10%, 50/60 Hz (optional)
Four 1/4-20 mounting holes in base
*Over optimum displacement range at calibrated target distance
Note: Specifications measured at 25 deg. C, 50% relative humidity. These specifications are typical and subject to change without notice.

Model LE-01 Laser Extensometer in gaging position for tensile test on a specimen
Model LE-01 Laser Extensometer


  • Glass-beaded retro-reflective tape for service to 200 deg. F.
  • Aluminum-backed strip for service to
    900 deg. F.
  • For higher temperature service consult the factory


The Laser Extensometers are Class II laser products. In normal usage they are not considered hazardous due to the low power of scanned laser beams. However, staring into the beam could cause damage to the operator's eyes and it is the operators responsibility to follow all safety precautions and safety labels.

Non-Contact Strain Measurement Devices
Electronic Instrument Research
PO Box 678 • Irwin, PA 15642
724-744-4636 • Fax: 724-744-4636
www.e-i-r.com • Email: eir.info@windstream.net