Optical Strain Gage | os3150

The os3150 is a rugged, spot-weldable strain gage based on fiber Bragg grating (FBG) technology.

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Product Description

Optimized for outdoor installations on steel structures, the os3150’s stainless steel carrier holds the FBG in tension and protects the fiber during installation. Since there are no epoxies holding the fiber to the carrier, long term stability is ensured by design. For temperature compensation, the os3150 may be connected in series with an FBG temperature gage like the os4350. Alternately, the very rugged os3155 strain gage offers a strain measurement approach similar to the os3150, but also includes built-in temperature compensation. For some applications, combining both os3150s and os3155s is an optimal solution.

Installation is easy and requires just a few minutes. Since the gages are welded in place, they can be used immediately after attachment without waiting for adhesives to cure. Armored cables lead to and from each gage, making both installation and fiber protection fast and easy. The armored cable is compatible with connector protection fittings (see below) that protect splice-free series connections to strain, temperature, acceleration and other types of optical sensors. The entire strain gage package is typically covered with a protective material to complete installation for long term protection.

In side by side comparisons with foil strain gages, the os3150 is equally sensitive and accurate, while providing for greater strain range and 100 times more fatigue life. The os3150 strain gage is qualified for use in harsh environments and delivers the many advantages inherent to all FBG based sensors.

This sensor can be used alone or in series as a part of an FBG sensor array. Installation and cabling for such arrays is much less expensive and cumbersome than comparable electronic gage networks. Multiple optical strain gages can be arranged in close proximity at 0, 45 and 90 degrees for strain rosette measurements.

Key Features

  • Rugged, permanent weldable package.
  • Armored cable integrated with sensor package for fiber protection and strain relief.
  • Fast, simple, repeatable installation.
  • Double ended design supports multiplexing of many sensors on one fiber.
  • Qualified to same rigorous standards used for comparable electronic gages.
  • Gage installation and protection achieved with same methods as conventional electronic gages.
  • Micron Optics’ patented micro opto-mechanical technology.
  • Included in ENLIGHT’s sensor templates – allows for quick and easy optical to mechanical conversions.


(for full specifications, please download data sheet)


Options and Accessories

os315x_pci                    os315x Protective Cover & Insulation Kit
os315x_wpkos315x Weatherproofing Kit (includes Stopaq Wrappingband, Stopaq Paste, and Kapton Tape for 1 sensor)
os315x_wpbos315x Weatherproofing Kit – Bulk Quantity (includes Stopaq Wrappingband, Stopaq Paste, and Kapton Tape for 40 sensors)

Ordering Information


Product Inquiry Form

Micron Optics Optical Sensing Guide - Download
os3150 Sensor Information Sheetos3150 Sensor Information Sheet - Download
os3150/55 Installation & Protection Guideos3150/55 Installation & Protection Guide - Download
os3150/55 STOPAQ Removalos3150/55 STOPAQ Removal - Download
os3150 Assembly Drawingsos3150 Assembly Drawings - Download
os3155 Sensor Information Sheetos3155 Sensor Information Sheet - Download
os3155 Test Document - Qualification Summaryos3155 Test Document - Qualification Summary - Download
os3155 Drawing - Rugged Strain Gage With Temperature Compensationos3155 Drawing - Rugged Strain Gage With Temperature Compensation - Download