ODiSI 6008 8-Channel Optical Distributed Sensor Interrogator (ODiSI 6000 Series)

Eight-channel ODiSI 600x distributed sensing instrument that measures strain and temperature along optical fiber at a 5.2 mm gage pitch.

Number of channels: 8
Gage pitch: 5.2 mm
Gages (measurement locations) per meter of sensor: 192
Max measurement rate: 30 Hz

Datasheet

Overview

The ODiSI 6008 is the eight-channel model of the ODiSI 600x line in Luna's ODiSI 6000 Series of optical distributed sensor interrogators. It works on the principle of measuring Rayleigh backscatter in low-cost, unaltered optical fiber. This lets it acquire strain and temperature continuously along each sensor, so a structure or process can be mapped in detail rather than measured at a few discrete points.

The ODiSI 600x models measure with a standard gage pitch of 5.2 mm, and the maximum aggregate measurement rate is 30 Hz. In standard mode with Standard Remote Modules, each channel supports a high-definition sensor up to 20 m long or a continuous fiber grating (CFG) sensor up to 15 m long. With the optional Extended Range Remote Modules, each channel supports sensors up to 100 m long as well as HD-SC strain-compensated temperature sensors.

Software and integration

The system ships with ODiSI application software running on a Linux-based controller. The software is used to identify and configure sensors, view real-time data, log measurements and replay saved files. Data can be streamed in real time over Ethernet using a JSON-based format. Integration features include IEEE 1588 PTP time synchronization, a TTL sync output and start/stop triggering. ODiSI Remote software for Windows and Linux allows remote control and viewing. Optional 3DViz software maps the data onto 3D CAD models or 2D images.

Luna lists the ODiSI 6000 Series as discontinued and names the ODiSI 7100 Series as its replacement.

Key Features

High-definition distributed strain and temperature sensing based on Rayleigh backscatter
8 measurement channels
Gage pitch of 5.2 mm (192 gages per meter of sensor)
Up to 100 m of sensing fiber per channel with Extended Range Remote Modules
Compatible with HD strain and temperature sensors, HD-SC strain-compensated temperature sensors and CFG sensors
Continuous optical alignment and calibration with every scan, requiring no user intervention
Real-time streaming of data over Ethernet via TCP-IP
IEEE 1588 PTP network time synchronization
JSON-based digital streaming data format
Sync output TTL pulse
Start and stop triggering functions
Passive, corrosion resistant, dielectric sensors
Long sensor life with no drift or recalibration

Specifications

System Configuration

Number of channels	8 ODiSI 600x models are offered with 1, 2, 4 or 8 channels; the ODiSI 6008 is the 8-channel model
Gage pitch	5.2 mm Gage pitch is the distance between centerpoints of consecutive gages
Gages (measurement locations) per meter of sensor	192 At 5.2 mm gage pitch
Max measurement rate	30 Hz
High-Definition (HD) strain & temperature sensor compatibility	Yes
Strain-compensated temperature sensor compatibility	Yes Requires Extended Range Remote Modules
Continuous Fiber Grating (CFG) sensor compatibility	Yes
Data interface	Ethernet

Sensor and Cable Lengths

Maximum sensor length per channel — standard mode	20 m
Maximum sensor length per channel — extended range	100 m Sensor lengths longer than 20 m, as well as HD-SC strain-compensated sensors, require optional Extended Range Remote Modules
Maximum CFG sensor length per channel (standard mode)	15 m
Standoff cable length	10, 50, 100, 150 or 200 m Standard lengths of 10, 50 and 100 m; two cables can be combined to form 150 and 200 m
Maximum patch cord length	Up to 19 m (depending on sensor length) Patch cord plus active sensor fiber must not exceed 20 m for Standard length mode or 100 m for Extended Range mode

Measurement Rates — HD Sensors, 5.2 mm Gage Pitch

2.5 m mode	30 Hz Rates are aggregate; divide by number of active channels to determine the per-channel rate
5 m mode	20 Hz Aggregate rate
10 m mode	12.5 Hz Aggregate rate
20 m mode	6.3 Hz Aggregate rate
50 m mode	2.5 Hz Aggregate rate
100 m mode	1 Hz Aggregate rate

Strain Performance — HD Sensors, 5.2 mm Gage Pitch

Strain measurement range	±15,000 µϵ
Resolution	0.1 µϵ
Instrument accuracy	±1 µϵ
System (instrument and sensor) accuracy	±30 µϵ Compared to NIST-traceable extensometer measurements; includes errors from ODiSI instrument and Luna strain sensors
Measurement uncertainty	±2 µϵ At zero and across the full strain range; twice the standard deviation of 1000 measurements
Dynamic loading rate	5 Hz

Temperature Performance — HD Sensors, 5.2 mm Gage Pitch

Temperature measurement range	-40 to 200 °C (with standard Luna sensors) With standard temperature sensors (HD6T and HD6SCT); wider range available with other sensor fiber
Temperature measurement resolution	0.1 °C
Temperature measurement uncertainty	±0.6 °C Twice the standard deviation of 1000 measurements

Continuous Fiber Grating (CFG) Mode

Gage pitch	6 mm CFG mode requires Luna CFG sensors
Gages per meter of sensor	166
Measurement rate — 2.5 m mode	62.5 Hz Aggregate rate
Measurement rate — 5 m mode	40 Hz Aggregate rate
Measurement rate — 10 m mode	25 Hz Aggregate rate
Measurement rate — 20 m mode	12.5 Hz Aggregate rate
System (instrument and sensor) accuracy	±30 µϵ Preliminary
Measurement uncertainty	±5 µϵ Preliminary
Dynamic loading rate	tbd
Temperature measurement uncertainty	±1.0 °C Preliminary

Strain-Compensated Temperature Mode

Gage pitch	1.04 cm Requires Luna HD-SC temperature sensors and Extended Range Remote Modules
Measurement rate (all lengths)	2.5 Hz
Resolution	0.1 °C
Measurement uncertainty	±0.9 °C
Strain compensation	Over an applied strain range of 0 to 1800 µϵ, measurement accuracy is ± 2.8 °C RMS error with the HD-SC sensor subjected to axial strain; includes effects of the ODiSI interrogator

Environmental and Physical

Class 1 laser	<10 mW
Operating temperature range — mainframe and controller	5 to 40 °C
Operating temperature range — standoff cable and remote module	5 to 60 °C
Storage temperature range	0 to 40 °C
Operating and storage relative humidity	10 to 90 % RH Non-condensing
Operating altitude	-15 to 3,000 m
Dimensions — mainframe (W x D x H)	34 x 35 x 11 cm
Dimensions — laptop controller (W x D x H)	36 x 24 x 1.7 cm
Weight (mainframe and controller)	17 lb (7.8 kg)
Power (mainframe and controller)	160 W

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

Applications

High fidelity model verification
Temperature mapping for batteries
Improving bonding and welding quality
Embedded sensors for smart parts
Strain characterization of new materials and complex structures
In-situ temperature profiling of critical processes
Two- and three-dimensional strain field measurement for FE model validation
Evaluation of multi-material joining
Detection of small cracks and defects in critical structures
Strain measurement on and in composite materials

Included

ODiSI mainframe with 8 channels
Instrument controller laptop
ODiSI application software
One standoff cable for each channel
One standard length remote module for each channel

Options & Accessories

Option	Description
OP06150	Extended Range Remote Module — Remote module supporting extended sensor lengths of 50 m and 100 m, in addition to standard sensor lengths and strain-compensated temperature (HD-SC) sensors.
OPT06100-R	Rack Mount Controller Option — Rack mount (1U) instrument controller (substituted for laptop).
OPT06020	USB-3106 Analog Output — 16-channel analog output module for ODiSI (voltage or current outputs).
OPT06125	3Dviz - 3D/2D Visualization Software — Visualization software for mapping real-time or saved ODiSI data onto 3D models and 2D images. Compatible with Windows OS.
OPT06123	3Dviz - 2D Visualization Software — Visualization software for mapping real-time or saved ODiSI data onto 2D images. Compatible with Windows OS.