os4100 Temperature Compensation Sensor for os3100 Optical Strain Gages (FBG)

Fiber Bragg grating temperature compensation sensor for the os3100 strain gage, mountable by spot weld, epoxy or screw.

Operating temperature range: -40 to 120 °C (150 °C short-term)
Temperature sensitivity: ~ 28.9 pm/°C (+/-0.5pm/°C)
Temperature range: -40 to 150° C
Short-term repeatability: ± 0.75°C (±21 pm)

Datasheet

Overview

The Luna os4100 Temperature Compensation Sensor is based on fiber Bragg grating (FBG) technology. Its design and installation procedure are similar to those of the os3100 Optical Strain Gage. Mounted close to an os3100, it provides temperature compensation for that gage. The sensor is designed to make fiber handling and installation fast and repeatable.

A stainless steel carrier holds the FBG in tension and protects the fiber during installation. No epoxy holds the fiber to the carrier, which supports long-term stability. A universal attachment feature on the carrier lets it be fastened by weld, epoxy or screw.

The os4100 can be used on its own or in series as part of an FBG sensor array. Installing and cabling such arrays costs less and is simpler than for comparable electronic gage networks. The sensor is qualified for use in harsh environments.

Each sensor ships with a Sensor Information Sheet that lists the calibration coefficients needed to convert wavelength data into engineering units. The ENLIGHT Sensing Software includes a utility that performs this calculation and records, displays and transmits data for large sensor networks.

Key Features

Designed specifically for temperature compensation of os3100 strain gages
Ruggedized, weldable sensor package
Qualified to the same rigorous standards applied to comparable electronic gages
Spot-weld, epoxy, or screw mounted
Fast, simple, repeatable installation
Double-ended design supports multiplexing of many sensors on one fiber
Patented micro opto-mechanical technology
Included in ENLIGHT sensor templates for quick optical to mechanical conversions

Specifications

Thermal Properties

Operating temperature range	-40 to 120 °C (150 °C short-term) Datasheet text reads '40 to 120°C (150°C short-term)'; the minus sign appears to be lost in text extraction
Temperature sensitivity	~ 28.9 pm/°C (+/-0.5pm/°C)
Temperature range	-40 to 150° C Connectors: -40 to 80°C
Short-term repeatability	± 0.75°C (±21 pm)
Drift	± 1.0°C (±29 pm) Typical: 50ºC and 85% Relative Humidity. Extreme conditions: 1.3ºC (±36pm); 1,000 hour soak 75ºC and 75% Relative Humidity

Physical Properties

Dimensions (mm)	See Diagram Below Dimension diagram in the datasheet
Weight	3.0g
Frame material	302 Stainless Steel Web page spells it '302 Strainless Steel'
Cable length	1 m (± 10 cm), each end
Fiber type	SMF28-Compatible
Cable type	1 mm Fiberglass Braid
Cable bend radius	≥ 17 mm
Fastening methods	Screws [1-72 (M1.6)], Spot Weld or Epoxy

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	os4100-wwww-1xx-1yy Example: os4100-1520-1FC-1FC
Wavelength (wwww)	Standard - 1460 to 1620 nm in 4 nm intervals Wavelengths for (+/- 1nm)
Cable 1 length & connector (1xx)	1 = 1 m Standard Cable Length; xx = UT (Unterminated) or FC (FC/APC Connector)
Cable 2 length & connector (1yy)	1 = 1 m Standard Cable Length; yy = UT (Unterminated) or FC (FC/APC Connector)

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

SHM for civil and geotechnical structures
SHM for energy systems
Structural test and model validation
Structures (bridges, dams, tunnels, mines, buildings, oil platforms)
Energy (wind turbines, oil wells, pipelines, nuclear reactors, generators)
Transportation (railways, trains, roadways, specialty vehicles, cranes)
Marine vessels (hull, deck, cargo containers)
Aerospace (airframes, composite structures, wind tunnels, static and dynamic tests)