Luna os7500 Fabry-Pérot fiber optic accelerometer with armored fiber cables

Luna / Series · FBG and FP Sensors

os7500 Fabry-Pérot Optical Accelerometer Series

Fiber optic Fabry-Pérot accelerometer family for vibration measurement up to 350 Hz, multiplexable up to 8 sensors per HYPERION channel.

Input range: +/- 2.5 g, +/- 10 g below 10 Hz
Input range: +/- 0.1 g, +/- 1 g below 10 Hz
Frequency range: 0 to 350 Hz
Frequency range: 0 to 100 Hz

View Models Datasheet

Overview

The os7500 is a fiber optic accelerometer family based on patent pending Fabry-Pérot (FP) technology. Used with the HYPERION instrument platform, the sensors can be combined in multi-sensor distributed systems together with other FP and FBG sensors.

The os7500 family covers a wide range of vibration measurement applications and can be used as a replacement for conventional accelerometers. Being optical, the sensors are immune to EMI and offer robust packaging and lightning and corrosion resistance. The family measures vibrations with frequency ranges up to 350 Hz.

The os7500 uses a two-fiber I/O design that allows the sensors to be multiplexed in a daisy-chain architecture. Each sensor responds only to optical signals within a 20 nm band and passes all other wavelengths in both directions, so up to 8 accelerometers can be combined per optical channel when used with a HYPERION instrument with a 160 nm wavelength range.

The ENLIGHT Sensing Software provides a utility to calculate, record, display and transmit data for large networks of sensors. Two models are available: the os7510, with a wider input range and frequency range up to 350 Hz, and the os7520, with higher sensitivity and a frequency range up to 100 Hz.

Models in this series

Model	Description
os7510	Luna os7510 Fabry-Pérot Fiber Optic Accelerometer (os7500 Series) Fabry-Pérot fiber optic accelerometer with a 0 to 350 Hz frequency range and 65 nm/g sensitivity for HYPERION interrogators.	Details →
os7520	Luna os7520 Fabry-Pérot Fiber Optic Accelerometer Fabry-Pérot fiber optic accelerometer from the os7500 family with 2500 nm/g sensitivity, ±0.1 g input range and 0 to 100 Hz frequency range.	Details →

Key Features

Wide dynamic range
Unmatched sensitivity
Low noise
Armored fiber cable
Rugged sensor package
Straightforward multiplexing for distributed measurement systems
Standard threaded connection to a structure for fast, simple and repeatable installation
Available mounting block for two and three axis configurations
Simple configuration and setup with ENLIGHT Sensing Software
EMI immunity
Up to 8 sensors per optical channel with a HYPERION instrument

Specifications

Performance Properties

Input range os7510	+/- 2.5 g, +/- 10 g below 10 Hz Input range tolerance is +/- 25%
Input range os7520	+/- 0.1 g, +/- 1 g below 10 Hz Input range tolerance is +/- 25%
Frequency range os7510	0 to 350 Hz Aliasing can occur for frequencies > 0.5 the sampling frequency
Frequency range os7520	0 to 100 Hz Aliasing can occur for frequencies > 0.5 the sampling frequency; web page prints '0 o 100 Hz'
Output noise os7510	< 50 μg/Hz1/2
Output noise os7520	< 1 μg/Hz1/2
Sensitivity os7510	65 nm/g As measured by a si255 HYPERION instrument; tolerance is +/- 25%
Sensitivity os7520	2500 nm/g As measured by a si255 HYPERION instrument; tolerance is +/- 25%
Bias temperature shift os7510	< 0.1 g/C
Bias temperature shift os7520	< 0.005 g/C
Operating temperature range	-40 to 80 °C
Scale factor temperature shift	+/-100 ppm/C
Nonlinearity	< 2 %
Transverse sensitivity	< 2%
Maximum mechanical shock	500 g, Peak

Physical Properties

Dimension; Weight os7510	43 mm x 14 mm x 12.6 mm; 45 g
Dimension; Weight os7520	47.5 mm x 20 mm x 12.6 mm; 68 g
Mounting method	10-32 Tapped hole
Case material / plating	Gold over nickel-coated Kovar
Cable type / length	Ruggedized tactical cable / 1m +/-0.1 m
Fiber type	SMF-28
Sensor wavelength range	20 nm

Ordering

Ordering code os7510	os7510-wwww-1xx-1yy-z
Ordering code os7520	os7520-wwww-1xx-1yy-z
wwww Center Wavelengths (20nm band)	Standard -1470, 90, 1510, 30, 50, 70, 90 & 1610nm
1xx Cable 1, Length & Connector	1 = 1 m Standard Cable Length; UT = Unterminated; FC = FC/APC Connector
1yy Cable 2, Length & Connector	1 = 1 m Standard Cable Length; UT = Unterminated; FC = FC/APC Connector