Name: Luna os7520 Fabry-Pérot Fiber Optic Accelerometer
Brand: Luna
SKU: os7520

Overview

The os7520 is a member of the Luna os7500 family of fiber optic accelerometers based on patent pending Fabry-Pérot (FP) technology. Used with the HYPERION instrument platform, it can be combined with other FP and FBG sensors in multi-sensor distributed measurement systems.

The os7500 sensors can replace conventional accelerometers in vibration measurement applications while adding EMI immunity, robust packaging and lightning/corrosion resistance. Within the family, the os7520 is the higher-sensitivity, lower-range model, covering frequencies from 0 to 100 Hz.

Multiplexing

The sensor uses a two-fiber I/O design that allows multiple sensors to be daisy-chained. 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 on a HYPERION instrument with a 160 nm wavelength range.

Software

ENLIGHT Sensing Analysis Software provides a utility to calculate, record, display and transmit data for large networks of sensors. HYPERION firmware includes os7500 support.

Key Features

Wide dynamic range
High sensitivity
Low noise
Armored fiber cable
Rugged sensor package
Straightforward multiplexing for distributed measurement systems
Up to 8 sensors per optical channel with a 160 nm HYPERION instrument
EMI immunity
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

Specifications

Performance Properties

Input range	+/- 0.1 g, +/- 1 g below 10 Hz Input range tolerance is +/- 25%
Frequency range	0 to 100 Hz Aliasing can occur for frequencies > 0.5 the sampling frequency. Web page prints '0 o 100 Hz' (typo); datasheet value used
Output noise	< 1 μg/Hz1/2
Sensitivity	2500 nm/g As measured by a si255 HYPERION instrument. Tolerance is +/- 25%
Bias temperature shift	< 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	47.5 mm x 20 mm x 12.6 mm
Weight	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

Part number format	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 m Standard cable length; UT Unterminated or FC FC/APC Connector
1yy – Cable 2, length & connector	1 m Standard cable length; UT Unterminated or FC FC/APC Connector

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

Options & Accessories

Option	Description
PF	Universal IP-67 Connector Protection
MB75	3 axis mounting block for os7500
UT	Unterminated cable termination — Termination type for cable 1 (xx) or cable 2 (yy)
FC	FC/APC Connector — Termination type for cable 1 (xx) or cable 2 (yy)