Optical Emission Spectrometry for Metals

OES Basics

An industry-standard analytical solution for metallurgical applications, optical emission spectrometry (OES) is well-established for the analysis of a large range of metals and alloys (from Ag to Zn). It is the ideal technology for process and quality control in metal production and is routinely applied directly in-the-field for foundry production. OES offers the possibility to analyze elemental composition of alloys down to the the trace level with minimal impact on operating throughput, ensuring precise and reliable readings for up to 40 individual alloying elements in a single minute. It is also possible to investigate non-metallic inclusions using advanced OES methods.

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What is OES?

Optical emission spectrometry (OES) is a tried-and-tested analytical technique that is widely used to measure the elemental composition of metals and alloys. It is often referred to as spark OES as electrical sparks are used to ablate surface material from metal samples so that it can produce characteristic optical emissions. This introduces the first of two primary components in a typical OES analyzer: the electrical source.

An electrode is typically used in OES systems to generate a high voltage electrical discharge that causes surface material to heat to the point of ablation. Vaporized molecules then become excited by the argon plasma generated by the electrical arc, or sparks. This causes them to emit element-specific light in the ultraviolet (UV) and visible range – although multiple emission lines will be present, comprising a full spectrum of wavelengths determined by the elements present in the sample and their concentration. Making sense of this spectrum requires the second primary component: the optical system.

Light generated by the spark process is directed towards the optical system and is dispersed through a vacuum region within the spectrometer housing using a diffraction grating. These signals are acquired and converted into electrical signals using either CCD (charge-couple device) detectors or PMTs (photomultiplier tubes). CCD detectors typically obtain signals from wavelengths of interest directly from collected spectra, while PMTs transform photons into electrical signals and transform those into concentrations using calibration curves.

Spark OES analysis provides the fastest possible determination of all the elements in metals of interest with outstanding accuracy and precision. Among the many metals and alloys that spark OES is ideal for analysing are: iron (Fe) and steel, aluminum (Al), copper (Cu), cobalt (Co), iron (Fe), magnesium (Mg), nickel (Ni), tin (Sn), titanium (Ti), and various precious metals. Alongside this exceptional precision, spark OES is also the most commonly used analytical technique in metallurgical facilities due to their ease-of-usability and maintenance. Sample preparation is quick and easy, typically performed using a standard grinding or milling machine, which can facilitate extremely high throughput (up to 400 samples a day).

Each of these integrated components is critical to making spark OES one of the highest reliability techniques in the analysis of metallic samples. It is routinely used to test finished and semi-finished goods from metals production (plates, sheets, tubes, etc.) and can be used in the field for interrogating melt samples from both primary and secondary metal production processes.

Customer Testimonial: ARL iSpark OES – ArcelorMittal in France

Optical Emission Analysis using the ARL iSpark Spectrometer

ARL SMS-2300 Automated Metals Analyzer for OES

ARL iSpark Metals Analyzer. The Trusted Standard

OXSAS Optical Emission Analytical Software for High Quality Metal Analyses

Robotic-based Automation for OES to Optimise Steel Production Automation

ARL QuantoShelter Automated Metals Analyzer

ARL easySpark Bench-top Metals Analyzer product overview

OES Product Guide

Spark-OES is a central technology to the metals and alloy manufacturing chain, providing crucial insights into the chemical content of solid metallic samples throughout the production cycle. With a choice of robust, high-precision OES spectrometers under the innovative ARL product line, our products can satisfy the unique demands of analytical roles from the foundry to the rolling mill.

Among our proprietary OES product offerings are the ARL easySpark and ARL iSpark Series. Each is adapted to the harsh working environments of iron and steel foundries and casting mills, providing the speed and accuracy required to meet your quality requirements and productivity objectives.

Check the brochure covering our OES portfolio of products.

ARL iSpark Plus Series OES Metal Analyzer

ARL iSpark Plus Series OES Metal Analyzer

Metal processors need a versatile elemental analysis solution for the wide range of metallurgical samples they deal with. From routine elemental analysis to metals R&D, the Thermo Scientific ARL iSpark Plus Series OES Metal Analyzer provides the solution sought by primary metals producers, foundries, fabricators in the automotive, aviation and appliance industries, contract laboratories, and recyclers. Adapted to the harshest environments, ARL iSpark Plus offer a high degree of functionality and features to achieve productivity and quality objectives. ARL iSpark Plus adds to the stability, availability, and speed of analyses, enabling production of more heats and a faster return on investment.

ARL easySpark OES

ARL easySpark

The ARL easySpark metal analyzer is designed to meet the challenges and demands of small-to medium-sized plants and laboratories in the metal industry that require high-quality, yet cost-effective OES analysis to produce parts for automotive, aviation, aerospace and consumer products, among other industries.

ARL SMS-3500 Automation for Twin OES or XRF

ARL SMS-3500

Drive process control laboratory efficiencies in the metals and mining industries with the Thermo Scientific ARL SMS-3500 Automation for Twin OES or XRF, a complete laboratory workflow automation solution. Primary metals producers' laboratories typically run two fully duplicate and separate spectrometry lines to assure fast response times when several urgent samples must be processed at the same time. The ARL SMS-3500 system is an affordable alternative. The automation of multiple spectrometers and preparation machines with the ARL SMS-3500 system offers reduced sample analysis cost, increased sample throughput, better reproducibility and higher quality results for users requiring more comprehensive and integrated automation solutions in the metals and mining industries.

ARL iSpark OES

ARL easySpark OES

OES poster downloads - Quick Guide and Periodic Table
OES Periodic table and quick guide posters

We offer you our Optical Emission Spectrometry Quick Guide poster summarizing the OES basic theory, technology and applications, as well as OES Periodic Table poster. Download them now for free!

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10 Reasons Steel Industry Uses the ARL iSpark with Spark-DAT Inclusion Analysis

Always present in steel, inclusions are often undesirable, because of deleterious effects on the properties of the steel and the running of the manufacturing process, and considerable costs that this entails for the steelworks. The effects can, for example, lead to failure of the end product, which is especially critical when steel is used in buildings, infrastructure, cars, airplanes and many other objects where safety is paramount.

For more than 20 years, Thermo Fisher Scientific has been leader in ultra-fast analysis of nonmetallic micro-inclusions by spark OES. Take a look at the 10 reasons why it is so.

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10 Reasons Steel Industry Uses the ARL iSpark with Spark-DAT Inclusion Analysis