Name: os3200 Non-Metallic Optical Strain Gage (FBG, Epoxy-Mounted)
Brand: Luna
SKU: os3200

Overview

The os3200 is a small, non-metallic, epoxy-mounted optical strain gage based on fiber Bragg grating (FBG) technology. A self-adhesive backing holds the sensor body in place and protects the FBG while epoxy is injected; the epoxy encapsulates the FBG and bonds it to the surface of the structure. Installation takes a few minutes, and measurements can be taken once the epoxy has cured for 24 hours at room temperature.

In side-by-side comparisons with foil strain gages, the os3200 is equally sensitive and accurate, while offering a greater strain range and 100 times more fatigue life. The gage is qualified for use in mild environments.

The sensor can be used alone or in series as part of an FBG sensor array, with a double-ended design that allows many sensors to be multiplexed on one fiber. Multiple gages can be arranged in close proximity at 0, 45 and 90 degrees for strain rosette measurements.

Each sensor ships with a Sensor Information Sheet listing the gage factor and calibration coefficients needed to convert wavelength information into engineering units. The ENLIGHT Sensing Software includes the os3200 in its sensor templates and provides a utility to calculate, record, display and transmit data for large sensor networks.

Key Features

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
Patented micro opto-mechanical technology
Included in ENLIGHT's sensor templates for quick and easy optical to mechanical conversions
Sensor Information Sheet with gage factor and calibration coefficients provided with each sensor
Can be arranged at 0, 45 and 90 degrees for strain rosette measurements

Specifications

Performance Properties

Strain sensitivity	~ 1.2 pm/με Actual gage factor provided with gage
Gage length	10 mm
Operating temperature range	-40 to 60 °C (80 °C max) Prolonged exposure to maximum temperature could reduce performance. The newer Luna data sheet lists -40 to 60° C without the 80 °C max
Strain limits	± 5,000 με
Maximum drift	50 με 40 temperature cycles -40 to 60° C

Physical Properties

Dimensions	See Diagram Below Dimensional drawing in data sheet
Weight	1.0 g
Carrier material	Santoprene™
Cable length	1 m (± 10 cm), each end
Fiber type	SMF28-Compatible
Cable type	1 mm Fiberglass Braid
Connectors	FC/APC optional
Cable bend radius	≥ 17 mm
Fastening methods	Epoxy See installation guide for details

Optical Properties

Peak reflectivity (Rmax)	> 70%
FWHM (-3 dB point)	0.25 nm (± .05 nm)
Isolation	> 15 dB @ ± 0.4 nm around center wavelength

Ordering Information

Part number format	os3200-wwww-1xx-1yy wwww = wavelength; 1xx = cable 1 length & connector; 1yy = cable 2 length & connector
Wavelength (wwww)	Standard - 1460 to 1620 nm in 4 nm intervals +/- 1nm
Cable length (1xx / 1yy)	1 m Standard, Cable Length