Development of calibration protocols and procedures

Laura MIHAI

CETAL – National Institute for Laser, Plasma and Radiation PhysicsMagurele, Romania

OPTIMISE Annual Workshop and MC meeting. Limassol, Cyprus. 22nd – 24th Feb 2017

COST is supported by the

EU Framework Programme

Horizon 2020

CETAL - CENTER FOR ADVANCED LASER TECHNOLOGIES - Photonics Laboratory

CETAL - CENTER FOR ADVANCED LASER TECHNOLOGIES - Photonics Laboratory

Variable Calibration Standard for Radiance / Luminance and Color temperature

System with double monochromator

Wavelength range: 0.20 – 30 µmWavelength accuracy : ± 0.05%Wavelength precision : ± 0.01%Dispersion : 2 nm/mmBandwidth: 0.25 to 10 nmChopper rate -programmable, 10 – 500 Hz

High sensitivity detectors:UV-Enhanced Silicon: 0.2 to 1.1μmTE Cooled Ge: 0.8 to 1.8 μmTE Cooled PbS: 1.0 to 3.2 μmLN2 Cooled InSb: 1.0 to 5.5 μmLN2 Cooled HgCdTe (Extended Range): 1.0 to 21 μmPyroelectric: 1.0 to 30 μm

NVS Imaging telescopePTFE and Gold Integrating Spheres for Diffuse/ Total ReflectanceGoniometer system for specular reflectance and transmittanceetc.

Calibration Standard Lamps (200nm - 30µm)

OL FEL High-accuracy Irradiance Standard

Transfer Uncertainty*High accuracy ............................................................. ± 1%Super High-accuracy ............................................... ± 0.5%Uncertainty* - Illuminance .............................................. ± 1%

-luminance, color temperature, 1/spectral radiance (350 to 2500 nm) -Spectral Radiance Uncertainty @ 550 nm 2% relative to NIST

TITLE: Development of procedures andprotocols for the calibration ofspectrometer systems for measuringreflectance and fluorescence for nearground support of ESA FLEX observations

HOST Laboratory /Country and PI:NERC Field Spectroscopy Facility, University ofEdinburgh, Edinburgh (UK)Coordinator: Dr. Alasdair Mac Arthur

GUEST Laboratory/ Country and PI:CETAL - National Institute for Laser, Plasma andRadiation Physics / RomaniaESR Name: Dr. Laura MihaiDuration: 6 days

STSM

Main objective develop laboratory-based calibration and characterizationprocedures for spectrometers acrossthe spectral range of the FLEXfluorescence imager, at samplinginterval and band widths which willenable the detection of the solar fluxin the telluric oxygen A and B bandsreaching the Earth’s surfacemeasurements.

https://earth.esa.int/web/guest/missions/esa-future-missions/flex/news/-/article/sentinels-and-flex-join-forces

https://earth.esa.int/web/guest/missions/esa-future-missions/flex/news/-/article/sentinels-and-flex-join-forces

Main tasks

Establish laboratory common calibration procedures and protocols tobe used for piccolo dual-field-of-view fibre optic-based spectrometerssystem (wavelength calibration, irradiance and radiance calibration)

1. Characterize the calibration system (double monochromator system)

2. Calibrate and characterize spectrally the Piccolo dual-field-of-view fibreoptic-based spectrometers system using two different methods: usingreference lamps and using a double monochromator

3. Calibrate the Piccolo dual-field-of-view fibre optic-based spectrometerssystem in radiance and irradiance

1.Double-monochromator characterizationSlits Aperture Light Source Range Step

0.05, 0.5, 0.05 5.0mm Neon 686-696 nm 0.05nm

0.05, 0.5, 0.05 5.0mm Argon 758-768 nm 0.05nm

0.05, 0.5, 0.05 5.0mm Argon 768-778 nm 0.05nm

1.25, 5.0, 1.25 5.0mm Neon 686-696 nm 0.05nm

1.25, 5.0, 1.25 5.0mm Argon 758-768 nm 0.05nm

1.25, 5.0, 1.25 5.0mm Argon 768-778 nm 0.05nm

2.5, 5.0, 2.5 5.0mm Neon 686-696 nm 0.05nm

2.5, 5.0, 2.5 5.0mm Argon 758-768 nm 0.05nm

2.5, 5.0, 2.5 5.0mm Argon 768-778 nm 0.05nm

5.0, 5.0, 5.0 5.0mm Neon 686-696 nm 0.05nm

5.0, 5.0, 5.0 5.0mm Argon 758-768 nm 0.05nm

5.0, 5.0, 5.0 5.0mm Argon 768-778 nm 0.05nm

Integrating sphere with reference lamp

Reference lamp controller

4 different slits

2 different light sources (pen lamps type well known spectra)

different scanning spectral range

768 770 772 774 776 7780,00E+000

5,00E-013

1,00E-012

1,50E-012

2,00E-012

2,50E-012

3,00E-012 0.05-0.5-0.05

Sig

nal (a

.u.)

Wavelength (nm)

768 770 772 774 776 7780,00E+000

2,00E-010

4,00E-010

6,00E-010

8,00E-010

1,00E-009

1,20E-009 1.25-5-1.25

Wavelength (nm)

768 770 772 774 776 7780,00E+000

5,00E-010

1,00E-009

1,50E-009

2,00E-009

2,50E-009

3,00E-009

3,50E-009

5-5-5

Wavelength (nm)

768 770 772 774 776 7780,00E+000

5,00E-010

1,00E-009

1,50E-009

2,00E-009

2,50E-009

2.5-5-2.5

Wavelength (nm)

Double-monochromator characterization

770 771 772 773 774

0,0

0,1

0,3

0,4

0,5

0,6

0,8

0,9

1,0

Argon lamp

0.05-0.5-0.05 --> meas.772,60 nm and FHWM=0,11nm

1.25-5-1.25 -->meas. 772,66 nm and FHWM=0,66nm

Wavelength (nm)

No

rma

lize

d s

igna

l

0,0

0,2

0,3

0,5

0,7

0,8

1,0

No

rma

lize

d s

igna

l

691 692 693 694 6950,0

0,2

0,3

0,5

0,7

0,8

1,0

Neon lamp

0,05-0,5-0,05 --> meas. 693,14 nm, FHWM=0,11 nm

1.25-5-1.25 --> meas. 693,12 nm, FHWM=0,79 nm

Wavelength (nm)

Norm

aliz

ed s

ignal

0,0

0,2

0,3

0,5

0,7

0,8

1,0

Norm

aliz

ed s

ignal

Integrating sphere with reference lamp

Reference lamp controller

Setups for piccolo spectral characterization

Slits Aperture Light Source Range Step

0.05, 0.5, 0.05 5.0mm Neon 686-696 nm 0.05nm

0.05, 0.5, 0.05 5.0mm Argon 758-768 nm 0.05nm

0.05, 0.5, 0.05 5.0mm Argon 768-778 nm 0.05nm

1.25, 5.0, 1.25 5.0mm Neon 686-696 nm 0.05nm

1.25, 5.0, 1.25 5.0mm Argon 758-768 nm 0.05nm

1.25, 5.0, 1.25 5.0mm Argon 768-778 nm 0.05nm

2.5, 5.0, 2.5 5.0mm Neon 686-696 nm 0.05nm

2.5, 5.0, 2.5 5.0mm Argon 758-768 nm 0.05nm

2.5, 5.0, 2.5 5.0mm Argon 768-778 nm 0.05nm

5.0, 5.0, 5.0 5.0mm Neon 686-696 nm 0.05nm

5.0, 5.0, 5.0 5.0mm Argon 758-768 nm 0.05nm

5.0, 5.0, 5.0 5.0mm Argon 768-778 nm 0.05nm

2.

700 750 800 850 900 950 10000,0

0,2

0,4

0,6

0,8

1,0770 772 774 776 778

0,0

0,2

0,4

0,6

0,8

1,0

760 762 764 766 768 7700,0

0,2

0,4

0,6

0,8

1,0

No

rma

lize

d s

ign

al

---- Gauss fit

Wavelength (nm)

772.026 nm

FHWM2=1.09 nm

Wavelength (nm)

763.057 nm

FHWM1=1.16 nm

Argon lamp absorption lines using USB 2000+

2. Spectrometers system spectral characterization

760 761 762 763 764 765 766 767 768 769 7700,0

0,2

0,4

0,6

0,8

1,0

760 761 762 763 764 765 766 767 7680,0

0,2

0,4

0,6

0,8

1,0

No

rmlli

lze

d s

ign

al

Wavelength (nm)

763.25nm

763.2nm

763.15nm

763.1nm

763.05nm

763nm

762.95nm

762.9nm

OL750 absorption lines using USB2000+

Wavelength (nm)

set

=762.55nm

=763,085 nm

FHWM=0,84 nm

685,5 686,0 686,5 687,0 687,5 688,0

0,0

0,2

0,4

0,6

0,8

1,0

685,5 686,0 686,5 687,00,0

0,2

0,4

0,6

0,8

1,0

686,0 686,5 687,0 687,50,0

0,2

0,4

0,6

0,8

1,0

No

rma

lize

d S

ign

al (a

.u.)

Wavelength (nm)

687.6 nm

687.7 nm

687.8 nm

687.9 nm

688 nm

688.1 nm

688.2 nm

688.3 nm

688.5 nm

689 nm

set

=687.9 nm

Gauss fit:

=686.45 nm

FHWM=0.27 nm

OL750 absorption lines with QEPro

set

= 688.2 nm

Gauss fit:

=686.76 nm

FHWM=0.27 nm

2. Spectrometers system spectral characterization

500 550 600 650 700 750 800 850 9000,0

0,3

0,5

0,8

1,0688 692 696 700 704 708

0,0

0,3

0,5

0,8

1,0

Gauss fitting:

=701.47 nm

FHWM1=2.25 nm

=703.18 nm

FHWM2=0.92 nm

Ne lamp absorption lines with QEPro

Gauss fitting:

=691.27 nm

FHWM=1.82 nm

No

rma

lize

d S

ign

al (a

.u.)

Wavelength (nm)

3. Setup for radiance calibration

RADIANCE CALIBRATION STANDARD INTEGRATING SPHERE

RADIANCE CALIBRATION STANDARD CONTROLLER

1000fL

90 spectra x 3 / spectrometer

300 400 500 600 700 800 900 1000 1100

0

2000

4000

6000

8000

10000

12000

14000

16000

Sm

ea

n-S

da

rk (

DN

)

Wavelength (nm)

USB 2000

Field spectrometers radiance calibration

640 660 680 700 720 740 760 780 800 820

0

20000

40000

60000

80000

100000

120000

140000

160000

Sm

ea

n-S

da

rk (

DN

)

Wavelength (nm)

QEPro

300 400 500 600 700 800 900 1000 1100

0

20

40

60

80

100

120

Std

ev

Wavelength (nm)

USB2000

640 660 680 700 720 740 760 780 800 820

0

20

40

60

80

100

120

140

160

180

Std

ev

Wavelength

QEPro

Was done the wavelength characterization and calibration of a Piccolo dual-field-of-viewfibre optic-based spectrometers system has been done using two different methods:

firstly was determined the FWHM and the shape of the OL750D source fordifferent configurations, establishing the monochromator system performances.

Secondly, the FWHM values and the spectral response peaks shapes weredetermined for the spectrometers system

Has to be done:- a better characterization OL750D system spectral response with more spectral lines

lamps.- to assess the irradiance and FOV calibration methods- to delevope the procedures to support FLEX hnear-ground instrumentation.

The general protocol and calibration procedure for a dual field system was establishedduring the STSM, the next step being to repeat the procedure for the applicants ownlaboratory, in order to verify the procedure repeatability.

Future work and comments

AcknowledgementsThis work was supported by the COST Action ES1309.I kindly acknowledge the support of Chris MacLellan from NERC/NCEO Field Spectroscopy Facility, Dr.Alasdair Mac Arthur University of Edinburgh and Dr. Dan Sporea from Photonics Laboratory, INFLPR.