• Optical_Strain_Gage_os3155

Optical Strain Gage | os3155

The os3155 is a rugged optical strain gage with integrated temperature compensation based on fiber Bragg grating (FBG) technology.

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Product Description

Optimized for outdoor installations on steel structures, the os3155’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.

The design is similar to the os3150 rugged strain gage but the os3155 includes a second FBG which provides active temperature compensation. The benefits of this approach include both more accurate temperature compensation (since the strain and temperature measurements are made in close proximity) and lower-cost installation (by reducing the need for additional cables, splices and handling to connect additional temperature gages).

The sensors can be installed in 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. Optional protection fittings help prevent damage to series connections even in harsh environments. This enables fast reliable field connections to other optical strain, acceleration or temperature sensors on the same fiber. 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 os3155 is equally sensitive and accurate, while providing for greater strain range and 100 times more fatigue life. The os3155 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.
  • Temperature compensation sensor  integrated inside. Measurement of relative temperature for compensation of strain measurements.
  • Close proximity of strain FBG to temperature FBG improves accuracy of strain measurement.
  • 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)
os3155_wpbos3155 Carrier Blank for Welding Practice (Package of 5)
os3155_dbros3155 Mounted to Demo Bar- os3155-tttt/ssss-1FC-1FC; +/-2,500 ue, 50mm gage length, SS frame, dbl-end. Bet

Ordering Information

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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