Transcript Fabry-Perot Displacement Sensor

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Fabry-Perot FISO Sensors
Presented by: Régis Blin, Technical Sales
Web Seminar
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Contents
Fabry Perot sensors:
 Introduction to FISO
 Principle
 Applications
 Sensors
 Reading units
 Conclusion
FISO Technologies
FISO Technologies Inc.
Smartec sister company
Founded in 1994
 1999 Acquired by Roctest Group
 Independent subsidiary
 Based in Quebec City
 2000 m2 production area
 ISO Certified
 ISO 9001:2008
 ISO 13485:2003 (Medical)
Clean Room
100 m2 Class 10 000 Clean Room
Plasma Enhanced Deposition
System
Anodic Bonder
Automated Production
Key advantage of FISO system
• Immune to
 EMI, RF,
 Lightning Strikes,
 High Voltage,
 Intense Magnetic Field,…
• Intrinsically Safe
• Long term reliability (no corrosion)
• Temperature independent (no T compensation)
• Low power loss / up to 4 km long distance
• Small size and light weight
• Low cost
Fabry-Perot sensors
• Point sensors for pressure, strain, deformation,
temperature, refractive index
• Long-terms stability
• High resolution
• Small size, packaging for geotechnical
instrumentation
• Lowest cost for FOS
Fabry Perot sensing principle
Fabry Perot sensors
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Measurement is achieved by measuring the FabryPerot cavity length using white light interferometry
Fabry-Perot Cavity
ca. 1 cm
Optical Fiber
Mirrors
The phase between the two reflections depends on the
strain and/or on the temperature on the sensor
FISO Technology
Sensor
FP cavity (Y2)
FP Cavity
Fiber optic
Connector
Y2
Y1
Signal conditioner
Reflected signal
Y1, Y2 correspond
to maxima of cross
correlation function
Incident signal
Source
2x2 Coupler
l
FP cavity (Y1)
US Patents:
5,202,939 & 5,392,117
Cross
correlation
function
Pixel
Y
Lens
CCD detector Optical cross correlator
l
FP coded light
Fabry-Perot Sensor packaging
Applications
El-Mauro Tailings Dam - Chile
Monitoring: during construction and long-term
Parameters:
Pressure: Piezometers (static and dynamic)
Temperatures
Strong Motion recorder
Purpose: Insure safety of the dam, FOS selected
for superior lightning protection, long lead cables,
dynamic pressure sensing and long lifetime.
El-Mauro Tailings Dam, Duct track
Final Terminal
House
@ 1800 m
Fiber Routing
to Terminal
2500
House
m
230
m
Stage 1 Terminal
House @ 1000 m
Cut-Off Trench
El-Mauro Tailings Dam, Cable protection
Strain Protection is
Compulsory for
long term
measurements
Objective:
Stress Protected
conductors and
instruments
Piezometers:
Sand
Drains
Foundation
Ducts for Conductors
Manholes
Foundation Drillings
El-Mauro Tailings Dam, Cable ducts
Manhole and
Armoured Ducts
Hydraulic tomography - USA
Monitoring: understanding underground water
movements
Parameters:
Pore water pressure
Advantages: micro-PZ selected for small cross
section, reduces borehole size, long lead cables
and long lifetime.
Hydraulic tomography - USA
Rotterdam Harbor - The Netherlands
Monitoring: continuous automatic monitoring from
the construction to the operation
Parameters:
Total Pressure Cell for stresses in soil
Purpose: fiber optical TPC selected for long lead
cables and long lifetime.
Fabry-Perot Total Pressure Cell (lightning)
FOP-C sensor
Oil-filled pressure cell
ESA VEGA Ground Segment SHM
Monitoring: continuous automatic monitoring
Parameters:
Stresses in steel girders
Purpose: fiber optical strain gauges selected for
long lead cables and long lifetime.
ESA VEGA Ground Segment SHM
LNG Tank, Huelva Storage - Spain
Monitoring: long-term
Parameters:
Annular space monitoring
Vertical, Horizontal and Rotational Movements
Purpose: FOS selected for cryogenic
environment, long lead cables and long lifetime.
LNG Tank Annular Space
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Absolute measurement
Linear response
Range: 20 mm (0.79’’)
Long leads lengths
Easy to use
Heavy duty and robust
Reliable and promising long term stability
Independent of light source stability
Huelva storage (Spain)
Superconducting structures, ITER Magnets
Monitoring: continuous
automatic monitoring
Parameters:
Displacement, strain, temperature
Purpose: fiber optical sensors
selected for resistance to cryo,
radiation, vacuum and strong
magnetic fields.
Superconducting structures, ITER Magnets
Superconducting structures, ITER Magnets
Correction Coils
Feeders
FISO Pressure Sensors
Fabry-Perot Pressure sensors
Silicon Membrane
d
dd000
Fabry-Perot Cavity
Pyrex
P
P2
P1
P0
d2 d1
d0
Fabry-Perot Piezometers
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Intrinsically safe
Immune to EMI/RFI/Lightning
Long-term reliability
Accuracy of ±0.25% F.S.
High resolution
Rugged stainless steel construction for harsh environments
SPECIFICATIONS
PERFORMANCE
Range
Accuracy
Resolution
Overload
200, 350, 500, 750, 1000, 1500, 2000, 3000, 5000, 7000 kPa
±0.25% F.S.
0.025% F.S.
1.5 × F.S.
MODEL
Housing
FOP
Slim
Outside diameter
Length
Material
Filter
19 mm
25.4 mm
100 mm
100 mm
Stainless steel
Stainless steel, ~50 μm, ~10 kPa low air entry
Ceramic, ~1 μm, ~450 kPa high air entry
FOP-F
Thick-wall
FOP-C
Threaded
(STD 1/4" 18 NPT)
19 mm
100 mm
FOP-P
Push-in point
with EW thread
33.4 mm
210 mm
FOP-MicroPZ
The FOP-MicroPZ is a fiber optic piezometer used to measure
pore-water (or other fluids) pressure. One of the main differentiator
of the FOP-MicroPZ is its very small size, enabling it to be used
where no other piezometers can. Moreover, the FOP-MicroPZ has
similar or better performances than traditional piezometers.
 Range
 Accuracy:
 Resolution:
100, 200, 300 kPa
± 0.1 % F.S.
0.025 % F.S.
FISO Displacement sensors
Fabry-Perot Displacement Sensor
The FOD is an absolute position sensor. Its design is based on a Thin Film
Fizeau Interferometer device (TFFI) mounted on a movable shaft.
 Linear stroke:
20 mm
0.002 mm
±0.02 mm
 Resolution:
 Accuracy:
 -200°C to 100°C
 Aluminum, Stainless Steel.
Fabry-Perot Displacement Sensor
Optical fibre
Light in
Light out
Fizeau (variable FP)
Mirror
Displacement
Fabry-Perot Displacement Sensor
 Applications: Low frequency displacement measurements
anywhere where an electric wire is forbidden, or where lightning
strike too often.
 Outside structures, Nuclear enclosure monitoring, Oil & Gas
reservoir monitoring
 Advantages:
Immune to EMI, to lightning strikes
FISO Strain Sensors
Fabry-Perot Strain sensors
Fabry-Perot
Cavity
dt0
dc
Compression
Ɛ
Tension
Ɛt
Ɛ0
Ɛc
dc d0
dt
d
Fabry-Perot Strain Sensors
Range: ±1000µε up to ±3000µε
 EFO
Resolution: 0.01% FS
Trans. Sensitivity: <0.1% FS
Operating temp.: -40°C to 85°C
Range: ±1000µε Up to ±5000µε
 SFO-W
Resolution: 0.01% FS
Trans. Sensitivity: <0.1% FS
Operating temp.: -40°C to 85°C
Range: ±1000µε Up to ±10000µε
 FOS-N
Resolution: 0.01% FS
Trans. Sensitivity: <0.1% FS
Operating temp.: -40°C to 250°C
FISO Temperature Sensors
Fabry-Perot Temperature Sensors
Fiber with
large CTE
Fiber with
low CTE
300 um
d0 dc
Fabry-Perot Cavity
T
Th
T0
Tc
dh
do
dc
d
dh
Fabry-Perot Temperature Sensors
 Range: from -40°C to typ. +85°C (max. 300°C)
 Response time: down to 750ms
 Resolution typ. 0.1°C and min. 0.01°C
 Accuracy ± 0.5°C
FISO Signal Conditionners
WLFPI Signal Conditionners
FTI-10
Evolution platform
DMI
FTI-10
DMI
FPI-HR
FPI-HS
Channel
1
16 or 32
1 or 2
1
Sequential
Parallel
N/A
Sequential
Sequential Parallel
Parallel
Max freq.
10 Hz
20 Hz
150ms-sw
250Hz (1ch)
125Hz (2ch)
15KHz
Analog output
±10V or
4-20mA
0 - 5V
0 - 5V
Power
12 VDC
24 VDC
24 VDC
12 VDC
Single-channel portable readout
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One channel
Voltage output and RS-232 communication ports
Backlit LCD screen
Small footprint (1/8 DIN)
Rugged and easy to use
Battery powered
16/32 channels readout
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16 to 32 channels
50 000 samples data logger
Programmable data logger
NEMA-4 enclosure
Integrated modem for remote monitoring
LED indicators for FODL-1600/3200 status
FPI-HR Modules
 Robust table-top design
 OEM module @ 250 Hz / 125 Hz per channel
 1-2 Channels (parallel)
 Fully protected OEM design
 Small footprint (102 x 102 x 45 mm)
 Smart connectors SCAI
 DIN-rail snap-on
 Analog +USB
 Temperature compensation
FPI-HR
1-2 channels
(250 Hz=125 Hz/channel)
Evolution reading unit
The evolution reading unit is composed of an evolution platform, a
usb / power transmission interface, and 2 FPI-HR modules of 2
channels each.
SCAI connector is a smart connector. On the sensor side a microchip
containing the calibration factors is included.
The chip is read by the unit connector and data are automatically
loaded into the software.
.
Software integration
The data are fully compatible with SMARTEC SDB
Software for static data management, analysis and
representation
4.2 [mm/m]
Conclusions
• Fabry-Perot sensors: point sensors for pressure,
strain, deformation, temperature, refractive index
• Long-terms stability
• High resolution
• Small size, packaging for geotechnical
instrumentation
• Lowest cost for FOS
Thank you for your attention
SMARTEC
http://www.smartec.ch/