OL 750 Diffuse Spectral Reflectance Measurement System OL 750 Diffuse Spectral Reflectance Measurement System Optronic Laboratories, Inc

Optronic Laboratories, Inc.Optronic Laboratories, Inc.

OL 750 Diffuse Spectral OL 750 Diffuse Spectral Reflectance Measurement Reflectance Measurement

SystemSystem

OL 750 Diffuse Spectral OL 750 Diffuse Spectral Reflectance Measurement Reflectance Measurement

SystemSystem

Optronic Laboratories, Inc.Optronic Laboratories, Inc.Optronic Laboratories, Inc.Optronic Laboratories, Inc.


About Optronic About Optronic Laboratories, Inc.Laboratories, Inc.About Optronic About Optronic

Laboratories, Inc.Laboratories, Inc.

In 1998, Optronic Laboratories, Inc. moved In 1998, Optronic Laboratories, Inc. moved into its new 25,000 square foot purpose-built into its new 25,000 square foot purpose-built

facility, consolidating and expanding facility, consolidating and expanding production, R & D and calibration facilities.production, R & D and calibration facilities.

In 1998, Optronic Laboratories, Inc. moved In 1998, Optronic Laboratories, Inc. moved into its new 25,000 square foot purpose-built into its new 25,000 square foot purpose-built

facility, consolidating and expanding facility, consolidating and expanding production, R & D and calibration facilities.production, R & D and calibration facilities.


The OL Series 750 The OL Series 750 MonochromatorsMonochromators


The heart of any spectroradiometric The heart of any spectroradiometric system is the monochromator, but…system is the monochromator, but…

It must give the right bandpasses –It must give the right bandpasses – Too large and spectra are distortedToo large and spectra are distorted Too small and signals are lowToo small and signals are low

It must give high spectral purity (low It must give high spectral purity (low stray light) so only the wavelength of stray light) so only the wavelength of interest is detected.interest is detected.

The heart of any spectroradiometric The heart of any spectroradiometric system is the monochromator, but…system is the monochromator, but…

It must give the right bandpasses –It must give the right bandpasses – Too large and spectra are distortedToo large and spectra are distorted Too small and signals are lowToo small and signals are low

It must give high spectral purity (low It must give high spectral purity (low stray light) so only the wavelength of stray light) so only the wavelength of interest is detected.interest is detected.




Available in single Available in single and double and double (shown) versions(shown) versions

F/4 optics for high F/4 optics for high throughputthroughput

Very low stray lightVery low stray light Numerous special Numerous special

features for most features for most accurate resultsaccurate results

Available in single Available in single and double and double (shown) versions(shown) versions

F/4 optics for high F/4 optics for high throughputthroughput

Very low stray lightVery low stray light Numerous special Numerous special

features for most features for most accurate resultsaccurate results




Large range of Large range of gratings availablegratings available

Optimised for high Optimised for high efficiencyefficiency

Optimised for wide Optimised for wide wavelength rangewavelength range

Optimised for high Optimised for high resolutionresolution

Large range of Large range of gratings availablegratings available

Optimised for high Optimised for high efficiencyefficiency

Optimised for wide Optimised for wide wavelength rangewavelength range

Optimised for high Optimised for high resolutionresolutionTri-grating mounts change

gratings automaticallyTri-grating mounts change

gratings automatically




Range of Plug-in input Range of Plug-in input accessoriesaccessories

Choppers (shown) for Choppers (shown) for IR detectorsIR detectors

Automatic control of Automatic control of chopper speed and chopper speed and “open” position stop“open” position stop

Filter-wheel for input Filter-wheel for input attenuation or filteringattenuation or filtering

Range of Plug-in input Range of Plug-in input accessoriesaccessories

Choppers (shown) for Choppers (shown) for IR detectorsIR detectors

Automatic control of Automatic control of chopper speed and chopper speed and “open” position stop“open” position stop

Filter-wheel for input Filter-wheel for input attenuation or filteringattenuation or filtering

Versatile plug-in chopper or filter wheel input accessoriesVersatile plug-in chopper or filter wheel input accessories




Fully automated 11 Fully automated 11 position blocking-position blocking-filter wheelfilter wheel

Includes SHUT Includes SHUT position for dark position for dark current readingscurrent readings

Optimised filters Optimised filters for widest for widest wavelength rangewavelength range

Fully automated 11 Fully automated 11 position blocking-position blocking-filter wheelfilter wheel

Includes SHUT Includes SHUT position for dark position for dark current readingscurrent readings

Optimised filters Optimised filters for widest for widest wavelength rangewavelength range

Blocking-filter wheel changes filters automatically

Blocking-filter wheel changes filters automatically


Blocking filters:how they work



Gratings diffract light Gratings diffract light at different angles at different angles depending on depending on wavelengthwavelength

400nm will also 400nm will also diffract at the same diffract at the same angle as 800nm angle as 800nm (since (since 2 x 400 = 800)2 x 400 = 800)

A blocking filter A blocking filter removes the 400nm so removes the 400nm so just 800nm is leftjust 800nm is left

Gratings diffract light Gratings diffract light at different angles at different angles depending on depending on wavelengthwavelength

400nm will also 400nm will also diffract at the same diffract at the same angle as 800nm angle as 800nm (since (since 2 x 400 = 800)2 x 400 = 800)

A blocking filter A blocking filter removes the 400nm so removes the 400nm so just 800nm is leftjust 800nm is left

400nm +

800nm

400nm +

800nm400nm400nm400nm400nm

800nm800nm

Blocking filter

Blocking filter

grating




Light passes into the Light passes into the monochromator monochromator through the entrance through the entrance slit, then onto the slit, then onto the first collimating first collimating mirror.mirror.

Light passes into the Light passes into the monochromator monochromator through the entrance through the entrance slit, then onto the slit, then onto the first collimating first collimating mirror.mirror.




Collimated (parallel) Collimated (parallel) light is directed onto light is directed onto the grating.the grating.

Collimated (parallel) Collimated (parallel) light is directed onto light is directed onto the grating.the grating.




The grating diffracts The grating diffracts the light, sending the light, sending each wavelength off each wavelength off at a different angle.at a different angle.

The desired The desired wavelength is wavelength is collected by the first collected by the first focussing mirror….focussing mirror….

The grating diffracts The grating diffracts the light, sending the light, sending each wavelength off each wavelength off at a different angle.at a different angle.

The desired The desired wavelength is wavelength is collected by the first collected by the first focussing mirror….focussing mirror….




……which focuses it at which focuses it at the middle slit.the middle slit.

A second collimating A second collimating mirror collects this mirror collects this beam…beam…

……which focuses it at which focuses it at the middle slit.the middle slit.

A second collimating A second collimating mirror collects this mirror collects this beam…beam…




……and collimates it and collimates it onto a second onto a second grating.grating.

Since the second Since the second grating is linked to grating is linked to the first, they are at the first, they are at the same angle and the same angle and hence the same hence the same wavelength.wavelength.

……and collimates it and collimates it onto a second onto a second grating.grating.

Since the second Since the second grating is linked to grating is linked to the first, they are at the first, they are at the same angle and the same angle and hence the same hence the same wavelength.wavelength.




This second grating This second grating acts like the first, but acts like the first, but the spectral purity is the spectral purity is increased by many increased by many decades.decades.

This second grating This second grating acts like the first, but acts like the first, but the spectral purity is the spectral purity is increased by many increased by many decades.decades.




The pure The pure monochromatic light, monochromatic light, at the wavelength at the wavelength desired, is then desired, is then focussed onto the focussed onto the exit slit and emerges exit slit and emerges from the from the monochromator.monochromator.

The pure The pure monochromatic light, monochromatic light, at the wavelength at the wavelength desired, is then desired, is then focussed onto the focussed onto the exit slit and emerges exit slit and emerges from the from the monochromator.monochromator.


The OL Series 740-20 The OL Series 740-20 Light SourcesLight Sources


For transmission, reflection and For transmission, reflection and detector response measurements, a detector response measurements, a light source at the entrance of the OL light source at the entrance of the OL 750 creates monochromatic light at 750 creates monochromatic light at the exit.the exit.

The OL Series 740-20 is an ideal light The OL Series 740-20 is an ideal light source for most applications.source for most applications.

For transmission, reflection and For transmission, reflection and detector response measurements, a detector response measurements, a light source at the entrance of the OL light source at the entrance of the OL 750 creates monochromatic light at 750 creates monochromatic light at the exit.the exit.

The OL Series 740-20 is an ideal light The OL Series 740-20 is an ideal light source for most applications.source for most applications.




Single and double Single and double lamp versionslamp versions

UV lampUV lamp 200nm to 400nm200nm to 400nm

Tungsten lampTungsten lamp 250nm to 2500nm250nm to 2500nm

GlowbarGlowbar 1000nm to 1000nm to

30000nm30000nm

Single and double Single and double lamp versionslamp versions

UV lampUV lamp 200nm to 400nm200nm to 400nm

Tungsten lampTungsten lamp 250nm to 2500nm250nm to 2500nm

GlowbarGlowbar 1000nm to 1000nm to

30000nm30000nm




Optics match the Optics match the OL Series 750 OL Series 750 MonochromatorsMonochromators

Easy switching Easy switching from one source …from one source …

Optics match the Optics match the OL Series 750 OL Series 750 MonochromatorsMonochromators

Easy switching Easy switching from one source …from one source …




……to the otherto the other……to the otherto the other

Optics match the OL series 750 monochromators

Easy switching from one source …

Optics match the OL series 750 monochromators

Easy switching from one source …

Fully automated switching available

Fully automated switching available


The OL 750 + OL 740-The OL 750 + OL 740-2020

The OL 750 + OL 740-The OL 750 + OL 740-2020

200 to 30,000 nm 200 to 30,000 nm coveragecoverage

monochromatic light monochromatic light prevents sample prevents sample heatingheating

Suits a very wide Suits a very wide range of standard OL range of standard OL accessoriesaccessories

Suits many existing Suits many existing and future and future applicationsapplications

200 to 30,000 nm 200 to 30,000 nm coveragecoverage

monochromatic light monochromatic light prevents sample prevents sample heatingheating

Suits a very wide Suits a very wide range of standard OL range of standard OL accessoriesaccessories

Suits many existing Suits many existing and future and future applicationsapplications


Reflectance Reflectance MeasurementsMeasurements

Reflectance Reflectance MeasurementsMeasurements

Reflectance can be specular (like a Reflectance can be specular (like a mirror) or diffuse (like paper).mirror) or diffuse (like paper).

Optronic Laboratories, Inc. Optronic Laboratories, Inc. manufactures a wide range of manufactures a wide range of accessories for regular and diffuse accessories for regular and diffuse transmittance.transmittance.

Reflectance can be specular (like a Reflectance can be specular (like a mirror) or diffuse (like paper).mirror) or diffuse (like paper).

Optronic Laboratories, Inc. Optronic Laboratories, Inc. manufactures a wide range of manufactures a wide range of accessories for regular and diffuse accessories for regular and diffuse transmittance.transmittance.


Diffuse ReflectanceDiffuse ReflectanceDiffuse ReflectanceDiffuse Reflectance

Optronic Laboratories, Inc. Optronic Laboratories, Inc. manufactures a range of fixed-angle manufactures a range of fixed-angle and Edward spheres for diffuse and Edward spheres for diffuse reflectance measurements.reflectance measurements.

To illustrate a diffuse reflectance To illustrate a diffuse reflectance measurement system, we will use the measurement system, we will use the OL 750-70 Diffuse Reflectance OL 750-70 Diffuse Reflectance Attachment.Attachment.

Optronic Laboratories, Inc. Optronic Laboratories, Inc. manufactures a range of fixed-angle manufactures a range of fixed-angle and Edward spheres for diffuse and Edward spheres for diffuse reflectance measurements.reflectance measurements.

To illustrate a diffuse reflectance To illustrate a diffuse reflectance measurement system, we will use the measurement system, we will use the OL 750-70 Diffuse Reflectance OL 750-70 Diffuse Reflectance Attachment.Attachment.



Diffuse reflectance Diffuse reflectance is measured is measured against a standard.against a standard.

A scan is run with A scan is run with the standard, then the standard, then another with the another with the sample.sample.

Diffuse reflectance Diffuse reflectance is measured is measured against a standard.against a standard.

A scan is run with A scan is run with the standard, then the standard, then another with the another with the sample.sample.

StandardStandardSampleSample

Optronic Laboratories, Inc.Optronic Laboratories, Inc.SampleSample


From a simple From a simple viewpoint, the ratio viewpoint, the ratio of these scans of these scans would indicate the would indicate the sample reflectance.sample reflectance.

However, the However, the throughput of the throughput of the sphere changes sphere changes due to the sample.due to the sample.

From a simple From a simple viewpoint, the ratio viewpoint, the ratio of these scans of these scans would indicate the would indicate the sample reflectance.sample reflectance.

However, the However, the throughput of the throughput of the sphere changes sphere changes due to the sample.due to the sample.

CAUTION:Change in throughput

DO NOT USE

CAUTION:Change in throughput

DO NOT USE



Instead, the double Instead, the double beam method beam method should be used.should be used.

This involves 4 This involves 4 scans, three to scans, three to calibrate and one calibrate and one to measure.to measure.

Instead, the double Instead, the double beam method beam method should be used.should be used.

This involves 4 This involves 4 scans, three to scans, three to calibrate and one calibrate and one to measure.to measure.


Scan 1Scan 1

Scan 2Scan 2

Scan 3Scan 3

Scan 4Scan 4



The scans with the The scans with the beam directed at beam directed at the wall of the the wall of the sphere correct for sphere correct for the throughput the throughput changes.changes.

The true The true reflectance can reflectance can then be calculated.then be calculated.

The scans with the The scans with the beam directed at beam directed at the wall of the the wall of the sphere correct for sphere correct for the throughput the throughput changes.changes.

The true The true reflectance can reflectance can then be calculated.then be calculated.


Scan 2Scan 2Scan 4Scan 4


The OL Series 740-70The OL Series 740-70The OL Series 740-70The OL Series 740-70

Uses the double Uses the double beam method for beam method for accurate values of accurate values of reflectancereflectance

Software guides Software guides the user through the user through the calibration and the calibration and measurementmeasurement

Uses the double Uses the double beam method for beam method for accurate values of accurate values of reflectancereflectance

Software guides Software guides the user through the user through the calibration and the calibration and measurementmeasurement

Standard or sample

Standard or sample

Beam switch mirror

Beam switch mirror


The OL Series 740-70The OL Series 740-70The OL Series 740-70The OL Series 740-70

2 versions of the 2 versions of the OL 740-70 are OL 740-70 are availableavailable PTFE sphere PTFE sphere

coating for 250nm coating for 250nm to 2,500nmto 2,500nm

Gold sphere Gold sphere coating for 1,000nm coating for 1,000nm to 30,000nmto 30,000nm

2 versions of the 2 versions of the OL 740-70 are OL 740-70 are availableavailable PTFE sphere PTFE sphere

coating for 250nm coating for 250nm to 2,500nmto 2,500nm

Gold sphere Gold sphere coating for 1,000nm coating for 1,000nm to 30,000nmto 30,000nmStandard or

sampleStandard or

sample


The OL 750 + OL 740-The OL 750 + OL 740-20 + OL 740-7020 + OL 740-70


If we put these together…If we put these together…If we put these together…If we put these together…

And add a detector

And add a detector

Positive location&

Easy assembly

Positive location&

Easy assembly




...we have a complete system for diffuse reflectance....we have a complete system for diffuse reflectance....we have a complete system for diffuse reflectance....we have a complete system for diffuse reflectance.

The light-trap supplied also allows measurements

which exclude specular reflections.

The light-trap supplied also allows measurements

which exclude specular reflections.


More InformationMore InformationMore InformationMore Information

The systems illustrated represent The systems illustrated represent just a few of the accessories from just a few of the accessories from Optronic Laboratories, Inc.Optronic Laboratories, Inc.

For more information:For more information: Contact your local Optronic Contact your local Optronic

Laboratories’ representativeLaboratories’ representative

Visit our website at Visit our website at www.olinet.comwww.olinet.com

The systems illustrated represent The systems illustrated represent just a few of the accessories from just a few of the accessories from Optronic Laboratories, Inc.Optronic Laboratories, Inc.

For more information:For more information: Contact your local Optronic Contact your local Optronic

Laboratories’ representativeLaboratories’ representative

Visit our website at Visit our website at www.olinet.comwww.olinet.com

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OL 750 Diffuse Spectral Reflectance Measurement System OL 750 Diffuse Spectral Reflectance Measurement System Optronic Laboratories, Inc