alexandrine huot – québeccity – june 7th, 2016 › images › pdf... · alexandrine huot –...

www.telops.com

Alexandrine Huot – Québec City – June 7th, 2016

Innovative Infrared Imaging.

Outlines.“Time-Resolved Multispectral Imaging of Gases and Minerals”

• Telops product offering

• Background notions of infrared multispectral imaging

• Applications

– Remote sensing of Combustion Reaction

– Time-resolved multispectral imaging of gases

– Multispectral imaging of minerals

• Telops MS-IR Series

• Benefits of Telops MS-IR cameras

Quebec City.Telops was established in 2000 in Quebec City.

Has over 50 employees (Ph.D., M.Sc., Eng.).

Is privately owned & profitable since its creation.

Is established as a world leader in

thermal infrared imaging solutions.

www.telops.com

What We Do.Defence & Security – Aerospace – Oil & Gas – Environment – Industrial – Academic Research.

www.telops.com

Our Product Lines.Two Product Lines to Fit Your Needs.

The Hyper-Cam.Lightweight. Compact. Advanced.

www.telops.com

For ground based or airborne applications

320 x 256 pixel cooled detector

Adjustable spectral resolution of 0.25 to 150 cm-1

Many choices of spectral bands:• LWIR: 7.7-11.8 µm• LWIR Narrow-Band: 7.7-9.3 µm• Methane• MWIR: 3-5 µm• MWIR-E: 1.5-5 µm

Standard fields of view:• 20 x 25°• 6.4 x 5.1°• 1.8 x 1.4°

Open-Pit Mine

The IR Cams.High-Performance Cameras to Meet the Most Demanding Research Applications.

Five categories of infrared cameras customizable to suit your needs:

• High-Speed (FAST-IR)

• High-Definition (HD-IR)

• High-Dynamic-Range (HDR-IR)

• Multispectral (MS-IR)

• Thermal Scientific Measurement (TS-IR)

www.telops.comTelops Proprietary

Infrared Self-Emission.Background Notions.

• All objects emit infrared radiation

• The amount of infrared radiation, as well as the

maximum intensity of the Planck curve varies as

a function of temperature

• At thermal equilibrium, objects that absorb

infrared (IR) radiation will re-emit IR radiation

• The emissivity ( ) refers to the reflective nature

of an object

– Value between 0 and 1

0 1000 2000 3000 4000 5000 6000 7000 80000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8Planck Curve

Wavenumbers [cm-1]

Sp

ect

ral r

adia

nce

[W

/(m

2 s

r cm

-1)]

300 K

400 K

500 K

0 1000 2000 3000 4000 5000 6000 7000 80000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8Planck Curve

Wavenumbers [cm-1]

Sp

ect

ral r

adia

nce

[W

/(m

2 s

r cm

-1)]

300 K

400 K

500 K

LWIR SWIR NIR VISMWIR

Broadband Infrared Imaging.

• Infrared focal plane array (FPA) detectors are only sensitive over a defined spectral range. For example:

– Very longwave (VLW): 8-12 μm

– Longwave (LW): 8-10 μm

– Midwave (MW): 3-5 μm

• The signal measured for each pixel corresponds to the sum of all contributions, from all objects (solids, liquids and gases) and in the FPA detector spectral range


0 1000 2000 3000 4000 5000 6000 7000 80000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8Planck Curve

Wavenumbers [cm-1]

Sp

ect

ral r

ad

ian

ce [

W/(

m2 s

r cm

-1)]

300 K

400 K

500 K

0 1000 2000 3000 4000 5000 6000 7000 80000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8Planck Curve

Wavenumbers [cm-1]

Sp

ect

ral r

ad

ian

ce [

W/(

m2 s

r cm

-1)]

300 K

400 K

500 K

Hot

Cold

Infrared Imaging of Selective Absorbers/Emitters.

• What happens when imaging such object/chemicals ?

Minor contribution on the measured signal = Little contrast


SF6

vs0 500 1000 1500 2000 2500

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

Wavenumbers [cm-1

]

Spe

ctra

l ra

dia

nce

[W

/(m

2 s

r cm

-1)]

0 500 1000 1500 2000 25000

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

Wavenumbers [cm-1

]

Spe

ctra

l ra

dia

nce

[W

/(m

2 s

r cm

-1)]

Infrared Imaging of Selective Absorbers/Emitters.

• What happens when imaging such object/chemicals ?

Lack of spectral information = No selectivity


SF6

vs

0 500 1000 1500 2000 25000

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

Wavenumbers [cm-1

]

Spe

ctra

l ra

dia

nce

[W

/(m

2 s

r cm

-1)]

SO20 500 1000 1500 2000 2500

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

Wavenumbers [cm-1

]

Spect

ral ra

dia

nce

[W

/(m2

sr

cm-1

)]

Multispectral Imaging.

• The spectral range is split into several regions using spectral filters

• Intensity at each pixel represents the sum of all contributions in sub defined spectral ranges (i.e. filters)


Telops MS-IR Series.

• Selection of 8 Spectral Bands

– Interchangeable by user

• Filter wheel synchronized to detector frame rate

• Time-resolved multispectral imaging

– Filter wheel 6000 RPM

– Acquisition rate up to 800 Hz

• 100 Hz/band

• Different acquisition modes

– Static (fixed position)

– Synchronously rotating


www.telops.com

Remote Sensing of Combustion Reaction


Turbulent Flames.Combustion applications.

• Unpredictable behavior

• Rapid phenomena

• Characterization using invasive

technique is difficult

• Sampling issues

• Non-reproducible

• Combining results from different

experiments not possible

• Computational models difficult to

validate


Methanol (CH3OH) flame

Infrared Imaging.Turbulent Flame.

• Good spatial and temporal resolution

• Limitations

• Lack of selectivity toward the

chemical nature of the gas

• Lack of quantitative information

– Temperature

– Concentration

• Unrealistic temperature values when

gases are involved


Remote Sensing of Combustion.


• Typical combustion gases such as CO2, H2O,

CO … are selective absorber/emitters of

infrared radiation

• Radiometric calibration of broadband

cameras doesn’t account for selective

absorbers/emitters

C�H� + O� →H�O + CO� + CO + C � …

“Pure” blackbody radiation

Typical combustion

Time-Resolved Multispectral Imaging.


Camera Configuration.

Telops MS-IR MW FAST:

• 8-position filter wheel

• 100 Hz/spectral band

• Auto-exposure control in real-

time

Hyd

roca

rbo

ns

Thro

ugh

-fla

me

CO

2re

d-s

pik

e

CO

2 b

lue

-sp

ike

CO

H2O

+NO

Spectral filters

Time-Resolved Multispectral Imaging.


Results.

Hyd

roc.

Thro

ugh

-fla

me

CO

2 r

ed-s

pik

e

CO

2 b

lue

-sp

ike

CO

H2O

+NO

Radiative Transfer Model.


• First attempt using a simple

semi-translucent multi-layers

radiative transfer model

• Integration over the spectral

ranges associated with the

filters

• In-band radiance (IBR) profiles

‒ Low-resolution spectra

• Optimization carried out on the

different unknown parameters

L�� = L��τ�� + 1 τ�� L�� τ�� + L��

Function of gas plume: temperatureconcentration

Res

idu

es (

%)

IBR

(W

/m2.s

r)IB

R (

W/m

2.s

r)

Typical Results.


• Realistic flame temperature values are

obtained through IBR-profile optimization

Measurement

Fit

Residues

Spectral Channel

Quantitative Results @ 100 Hz.


www.telops.com

Time-Resolved Multispectral Imaging of Gases


Time-resolved Multispectral Imaging of Methanol Vapors.

• Warm methanol vapors

• Infrared emission dominates

• Normalized in-band radiance (IBR)

• Compare the response of individual spectral filters on a mutual basis

• The greatest contrast associated with methanol vapors is obtained through filters #5 and #6 as expected


In-Band Radiance (IBR).Gases detection.

• Integrate the Planck curve for each spectral filter

• Predict the response of each filter toward a specific target based on its infrared spectral signature

• Use this spectral information to enhance thermal contrast in the scene


Detection of Methanol Plume using IBR.


Hot

Cold

Broadband sequence (filter #1) at 30 Hz

.

Methanol correlation sequence at 30 Hz

Rad

ian

ce

Channel

www.telops.com

Multispectral Imaging of Minerals


Infrared spectral signature analysis.Solid targets.


• Quartz (SiO2) selectively absorb/emits infrared radiation in the longwave infrared (LWIR)

spectral range (8-12 μm)

Quartz correlation

• Quartz emissivity is lowest for bands #2, #4 and #5

‒ Absorption/

Reflection

• Quartz emissivity is highest for bands #6, #7, #8 and #3

‒ Blackbody-like

Infrared spectral signature analysis.Solid targets.


Hematite (Fe2O3) drill core containing quartz (SiO2) veins

Iron pyrite (FeS2)

Amethyst: quartz doped with irons (Fe)

www.telops.com

• Time-resolved infrared multispectral imaging combines

– spatial

– temporal

– and spectral resolution

• The simple correlation image between the multispectral in-band radiance and the known target emissivity (solids)

or absorption (gases) spectral signature offers target identification capabilities

• The outcome is the validation of an interesting new technique for target infrared signature measurement, which

combines the high frame rates of conventional thermal imaging to spectral analysis techniques

• Quantitative chemical information

• Represents an interesting alternative to hyperspectral imaging for some applications

– Fast frame rate

– Low spectral resolution requirements

– Higher spatial resolution

– Lower cost (-$)

Conclusions.

www.telops.com

• Site monitoring (safety)

• IR signature of targets

• Surface contaminants

• Specific solvent vapor/gas detection

• Camouflage characterization

• Mineral analysis/classification

• Energetic material

Main Applications.Multispectral Imaging.

Telops MS-IR Series.


Models.

Specification MS-IR MW MS-IR VLW

Detector type [-] MCT or InSb HD MCT HD InSb FAST InSb MCT

Spectral Band [µm] 3 to 5,1.5 to 5

(optional InSB)

3.7 to 4.8 3 to 5, 1.5 to 5

(optional)

3 to 5.41.4 to 5.4 (optional)

7.7 to 11.8

Spatial resolution [Pixels]

640 x 512 1280x1024 1280x1024 320 x 256 320x256

Typical NETD [mK] 20 25 20 25 25

Number of bands [-] 8

www.telops.com

We offer high-performance infrared broadband, multispectral and hyperspectral imagers.

Our cameras present the best combination of:

Spatial resolution

Spectral resolution

Temporal resolution

& Sensitivity.

All of our imagers are customizable to meet your specific needs.

In Short...

Questions?

www.telops.com

Have a Question? Ask Our Team.Our Sales Reps & Field Application Scientists are eager to answer all your questions.

North America, Australia &

Asia:

Vincent Farley

[email protected]

Field Application Scientist:

Alexandrine Huot

[email protected]

Europe, Middle East & USA:

Philippe Lagueux

[email protected]

www.telops.com

Headquarters:

100-2600 St-Jean-Baptiste Ave

Quebec QC Canada G2E 6J5

Tel: +1 (418) 864-7808

Fax: +1 (418) 864-7843

[email protected]

T H A N K Y O U !

(Image taken with the HD-IR.)

alexandrine huot – québeccity – june 7th, 2016 › images › pdf... · alexandrine huot –...

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