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Oxford Instruments Analytical GmbH Wellesweg 31 D- 47589 Uedem (Germany). Jochen Meurs Senior Product Manager OES. OPTICAL EMISSION SPECTROMETRY. It is all about light, wavelength and peaks.

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slide1

Oxford Instruments Analytical GmbH

Wellesweg 31

D- 47589 Uedem (Germany)

Jochen Meurs

Senior Product Manager OES

it is all about light wavelength and peaks
It is all about light, wavelength and peaks

In 1666 Isaac Newton collected sunlight with a magnifying glass, sent these beams of light through a prism and observed the passing light on a screen. He noticed a separation into colours. This colour ribbon is called a spectrum.

what is light and what is a spectrum
What is Light and what is a Spectrum

Light :

General definition: light is what we can see

But light is a wave (energy) where different colours have different wavelengths (energy)

Spectrum :

Is a continuous range or sequence defined in a particular order.

The colours available in a rainbow and visible by the human eye define a spectrum in which the individual colours has a defined appearance order and going from lower to higher wavelength (blue to red)

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The human eye is only able to see the spectral colours in the rainbow.

Beside the visible part of the spectrum, the light spectrum has areas of „waves“ the human eye can not determine.

Only spectrometers are able to observe the entire range.

The Light Spectrum

100 nm

Ultraviolet

Violet 380 nm

400 nm

Blue 460 nm

Green 510 nm

Yellow 560 nm

Orange 610 nm

Red 660 nm

800 nm

Infrared

1000 nm

physical basics light1
Physical basics - Light

n = c / l

Conversion Frequency / Wavelength (c = speed of light)

principal of a spectrometer
Principal of a Spectrometer

Source and Ignition

Computer

Readout of the CCD, calculation of the results, steering of the source and printout/storage of the data

316

Sample

Polychrome light

Light Emission

Power

The light is reflected and

separated by the diffraction

grating. The spectra appears on

the Rowland Circle.

Readout of the Intensity, calculation of the results

Steering of the source

Diffraction Grating, works similar like a prism

CCD for the readout of the light-intensity

Printout or storage of data

schematic view of optical system
Schematic view of optical system

Entrance Slit

Polychrome light, emitted during spark process, passes through the entrance slit and falls on the grating. The light is reflected and dispersed into individual spectral lines. The separated light is corresponding to particular wavelength of elements. The light than falls simultaneously on the CCD sensors.

Diffraction Grating:

Is like a concave mirror, but with rules on it. Modern Gratings have up to 4000 rules/mm. The incoming light is reflected and diffracted. The spectra appears.

CCD Chips

130 – 800 nm

Grating

elements and wavelength
Elements and Wavelength

Why do all elements have many different spectral lines?

....simply - each transition of an electron corresponds to a spectral line of a different wavelength

The intensity relates to the probability of a transition

Example: Aluminium about 400 lines

Ferrum about 4500 lines

Uranium about 5000 lines

Chromium about 2000 lines

spectrum of different samples
Spectrum of different samples

RE12: approx. 120 ppm C

BAS 406: 0.173 % C

BAS 407: 0.49 % C

BAS 408: 0.289 % C

BAS 409: 0.086 % C

C – 193.1 nm

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concentration

intensitiy

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Fields of use for spark-OES

1. Steel plant laboratories

  • High performance SPARK OES spectrometer (ARL 4460)
  • Vacuum optical system
  • LOD‘s < 10 ppm, 1 ppm typical
  • determination of gases like N2 and O2 possible
  • T(ime) R(esolved) S(pectrometry)
  • PMT detectors
  • laboratory automation
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Fields of use for spark-OES

2. Foundry laboratories

  • High performance SPARK OES spectrometer (OI FOUNDRY-MASTER Pro)
  • Vacuum optical system
  • LOD‘s < 50 ppm, 10 ppm typical
  • determination of N2 possible
  • CCD detectors
  • good price / performance ratio
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Fields of use for spark-OES

3. semi-finished products (e.g. tube manufacturers)

  • Rugged mobile SPARK OES spectrometer (OI TEST-MASTER Pro)
  • dust proof system
  • LOD‘s < 100 ppm, 50 ppm typical
  • determination of C, P, S possible
  • CCD detectors
  • 4 – 10 m probe umbilical
  • in-line automation
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Fields of use for spark-OES

4. Fabricators (incoming inspection)

  • Versatile mobile / stationary SPARK OES spectrometer
  • multi-matrix (all technical metals)
  • LOD‘s < 100 ppm, 50 ppm typical
  • determination of C, P, S possible
  • CCD detectors
  • grade identification
  • easy adaption to irregular shapes
slide27

P ositive

M aterial

I dentification

Fields of use for spark-OES

5. PMI-testing (refineries, power plants, ship yards)

  • Versatile mobile SPARK OES spectrometer
  • multi-matrix (all technical metals)
  • LOD‘s < 100 ppm, 50 ppm typical
  • determination of C, P, S possible
  • CCD detectors
  • grade identification
  • easy adaption to irregular shapes
  • battery operation
slide28

Fields of use for spark-OES

6. Scrap sorting

  • Handheld OES spectrometer
  • multi-matrix (all technical metals)
  • LOD‘s < 1000 ppm, 500 ppm typical
  • CCD detectors
  • grade identification
  • easy adaption to irregular shapes
  • battery operation
  • Carbon determination not possible
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