1224787448p28 Future of Nvis Display Msmt

8/6/2019 1224787448p28 Future of Nvis Display Msmt

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The Future of NVIS Display MeasurementThe Future of NVIS Display Measurement

ALI Advanced Seminar, 2006ALI Advanced Seminar, 2006 Optronic LaboratoriesOptronic Laboratories

The Future of NVIS DisplayThe Future of NVIS DisplayThe Future of NVIS Display

MeasurementMeasurementMeasurement

Dr. Richard Young

Optronic Laboratories, Inc.


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IntroductionIntroductionIntroduction

Thanks to the excellent quality of modern

scanning instruments, NVIS compatibility

measurements have become almost routine.

What improvements could instrument

manufacturers make


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IntroductionIntroductionIntroduction

Better sensitivity, so low luminance small spot

sizes can be measured as easily as highluminance large spot sizes.

Less variation in results

Faster scans Greater portability and ruggedness

Lower cost

A wish-list for improvements


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Sensitivity and VariabilitySensitivity and VariabilitySensitivity and VariabilityAn Example of OL 750S-NVG performance vs MIL sensitivity specification

1.0E-15

1.0E-14

1.0E-13

1.0E-12

1.0E-11

1.0E-10

1.0E-09

350 400 450 500 550 600 650 700 750 800 850 900 950

Wavlength [nm]

Radiance@1

0:1S/N[W/(cmn

msr)]

0.18mm spot size

0.3mm spot size

0.6mm spot size

1.8mm spot size

3.0mm spot size

MIL specification

Much of theMuch of the

variability isvariability is

due to thedue to the

longerlongerwavelengthswavelengths

Scanning systems haveScanning systems have

plenty of sensitivityplenty of sensitivity


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Sensitivity and VariabilitySensitivity and VariabilitySensitivity and Variability

OL 750S-NVG and OL 770-NVS performance vs MIL sensitivity specification

1.0E-15

1.0E-14

1.0E-13

1.0E-12

1.0E-11

1.0E-10

1.0E-09

350 400 450 500 550 600 650 700 750 800 850 900 950

Wavlength [nm]

Ra

diance@1

0:1S/N[W/(cmnmsr)]

0.18mm spot size

0.3mm spot size

0.6mm spot size

1.8mm spot size

3.0mm spot size

OL 770-NV

@ 0.17mm spot size

MIL specification

There is noThere is no

dramaticdramatic

change inchange inlongerlonger

wavelengthwavelength

sensitivitysensitivity

The OL 770The OL 770--NV detectoris based onNV detectoris based on

silicon, andhence has a different shape,silicon, andhence has a different shape,


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Spectroradiometer designSpectroradiometer designSpectroradiometer design

De ector

Exit lit

Entrance lit


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Detector

Exit lit

Entrance lit

Rotation


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Multi- h l

ete tor

Entr n Slit

NORot tion

(Each l ntb haves likea

detector+ slit)


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The Multiplex AdvantageThe Multiplex AdvantageThe Multiplex Advantage

When all the light is seen all thetime:

Noise is decreased. Sensitivity is increased.

Measurements can be faster.

The multiplex advantage means that an instrument simultaneously

measuring a signal over a range of frequencies obtains a t1/2 advantage

in the time t required to obtain a given signal-to-noise ratio compared

to that which would be necessary using dispersive methods if the

noise is detector-limited.

http://scienceworld.wolfram.com/physics/MultiplexAdvantage.html


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The OL 770-NVS is a special type ofspectroradiometer, many decades betterthanother multi-channel devices.

Far higher sensitivity Much lower noise

Orders of magnitude lower stray light

Vastly improved electronics

Dedicated software

State-of-the-arttechnology


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MIL Spec: OthersMIL Spec: OthersMIL Spec: Others

A.3.3. Wavelength accuracy & repeatability

Accuracytypical


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A.3.6. Linearity

In scale


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A.3.9. Spectroradiometer Optics

Full scale at


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Other AdvantagesOther AdvantagesOther Advantages

Sincethere are no moving parts

the construction is rugged and compact

results are highly repeatable

timetaken in moving the monochromator,

changing filters etc. is avoided


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Other AdvantagesOther AdvantagesOther Advantages

Sincethere is no photomultiplier

A veryexpensive component is avoided

The detector is not damaged by strong light

High voltages are not required

Since all the wavelengths are measured at

the sametime

It doesnt matter ifthe source is d.c., a.c.,

modulated or flashed


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An Intercomparison StudyAn Intercomparison StudyAn Intercomparison Study


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Green BGreen B NVIS RedNVIS RedNVIS YellowNVIS Yellow


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An Intercomparison StudyAn Intercomparison StudyAn Intercomparison StudySpectral Radiance of Samples

1.0E-12

1.0E-11

1.0E-10

1.0E-09

1.0E-08

1.0E-07

1.0E-06

350 400 450 500 550 600 650 700 750 800 850 900 950

Wavelength [nm]

SpectralRadiance[Wcm-

nm

-1]

NVI

Green B


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1.0E-11

1.0E-10

1.0E-09

1.0E-08

1.0E-07

1.0E-06

350 400 450 500 550 600 650 700 750 800 850 900 950

Wavelength [nm]


nm

-1]

NVI

Yellow


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1.0E-11

1.0E-10

1.0E-09

1.0E-08

1.0E-07

1.0E-06

350 400 450 500 550 600 650 700 750 800 850 900 950

Wavelength [nm]


nm

-1]

NVI

Red


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cd/m2

fL N a N b u' v' int time

51. 14. 1.46E- 6 1.11E- . .5398 0.45

51.31 14.98 1.46E-06 1.09E-07 0.3999 0.5399 0.45

51.31 14.98 1.46E-06 1.10E-07 0.3999 0.5399 0.45

51.35 14.99 1.46E-06 1.08E-07 0.3999 0.5398 0.4551.32 14.98 1.46E-06 1.07E-07 0.3999 0.5398 0.45

17.00 4.96 1.44E-06 1.08E-07 0.3994 0.5399 1.32

17.00 4.96 1.44E-06 1.10E-07 0.3993 0.5399 1.32

17.01 4.96 1.44E-06 1.09E-07 0.3993 0.5399 1.32

17.01 4.96 1.44E-06 1.05E-07 0.3994 0.5400 1.32

17.01 4.96 1.44E-06 1.08E-07 0.3993 0.5399 1.32

0.33 0.10 1.44E-06 1.07E-07 0.3992 0.5399 68.9

0.33 0.10 1.44E-06 1.10E-07 0.3992 0.5399 68.9

0.33 0.10 1.44E-06 1.11E-07 0.3993 0.5399 68.9

0.33 0.10 1.44E-06 1.09E-07 0.3992 0.5399 68.9

0.33 0.10 1.44E-06 1.06E-07 0.3992 0.5399 68.9

NVIS e Display


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NVIS adiance for reen B display (scaled to 0.1 fL)

0.0E+00

1.0E-11

2.0E-11

3.0E-11

4.0E-11

5.0E-11

6.0E-11

7.0E-11

8.0E-11

9.0E-11

1.0E-10

1.1E-10

1.2E-10

1.3E-10

1.4E-10

1.5E-10

1.6E-10

1.7E-10

0 2 4 6 8 10 12 14 16

Luminance of Display [fL]

NVIS

adiance[W/(cm

sr)]

System 1

System 2System 3

= NRa = NRb

open = day 1 solid = day 2

Spec. Max.

NVIS Green B ResultsNVIS Green B ResultsNVIS Green B Results

For


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NVIS adiance for reen B display (scaled to 0.1 fL)

0.0E+00

1.0E-11

2.0E-11

3.0E-11

4.0E-11

5.0E-11

6.0E-11

7.0E-11

8.0E-11

9.0E-11

1.0E-10

1.1E-10

1.2E-10

1.3E-10

1.4E-10

1.5E-10

1.6E-10

1.7E-10

0 2 4 6 8 10 12 14 16

Luminance of Display [fL]

NVIS

adiance[W/(cm

sr)]

System 1

System 2System 3

= NRa = NRb

open = day 1 solid = day 2

Spec. Max.

Scanning monochromator

performance - 0.007" spotsize

NVIS Green B ResultsNVIS Green B ResultsNVIS Green B Results

For 2For 2

minuteminute

scanscan

For 1For 1--22

minuteminute

scanscan

For


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NVIS Green B ResultsNVIS Green B ResultsNVIS Green B ResultsCIE 1976 u v Chromaticity Diagram

0

0.1

0.

0.3

0.4

0.5

0.6

0.7

0 0.1 0.

0.3 0.4 0.5 0.6 0.7

u'

v'

Monochromatic loc

us

Green

Yellow

Red

System1

System

System 3

0.5774

0.5775

0.5776

0.5777

0.5778

0.5779

0.1305 0.1306 0.1307 0.1308


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NVIS Yellow ResultsNVIS Yellow ResultsNVIS Yellow ResultsNVIS Radiance for Yellow display (scaled to 15 fL)

0.0E+00

2.0E-08

4.0E-08

6.0E-08

8.0E-08

1.0E-07

1.2E-07

1.4E-07

0 2 4 6 8 10 12 14 16 18

Luminanceof isplay [fL]

NRbRadiance[W/(cmsr)]

System1

System2

System3

Spec. Max.

Spec. Min.


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NVIS Yellow ResultsNVIS Yellow ResultsNVIS Yellow ResultsCIE 1976 u'v' Chromaticity Diagram

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

u'

v'

Monochromatic loc

us

Green

Yellow

Red

System1

System

System 3

0.5600

0.5601

0.5602

0.5603

0.2618 0.2620 0.2622 0.2624 0.2626


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Study ConclusionsStudy ConclusionsStudy Conclusions

All systems gaveextremely good repeatability in

NRa,NRb and chromaticity.

All systems gavethe same results with very low

uncertainties. All systems showed thatNRa and NRb were

essentially constant across a wide luminance range

foreach display.

All systems showed chromaticity was essentially

constant with luminance foreach display.


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1224787448p28 Future of Nvis Display Msmt

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