FEATURE SPECTROSCOPY
Spectrometers such as those from Avantes can be used to analyse the spectral output of horticultural lighting systems g
measure colour and colour temperature of LEDs very accurately, so that they could categorically bin them,’ he said. LEDs are often sorted by colour temperature when produced in large batches, and developments in spectroscopy are enabling this to be done at faster rates. ‘The customer came to us and said that because they had scaled their production, they needed to speed up the quality control process,’ Langston continued. ‘They needed a spectrometer that could measure very accurately and very quickly, so we developed a special high- throughput design with very low stray light to achieve that.’
34 Electro Optics May 2017
“We developed a special high throughput design with very low stray light to achieve it”
LEDs have been produced
increasingly on an industrial scale for 10 to 15 years, according to Langston, and the high volumes and fast speeds of LED production lines therefore need correspondingly fast quality control systems in order to maintain uninterrupted operation. Each LED on the line will receive a short pulse of current as it passes in front of a spectrometer, causing it to light
up, and in this short instance the system has to capture the emitted light and analyse it. Avantes’ Loop has observed
that, within industrial quality control, there has been a general transition away from using expensive, high- end spectroscopy systems towards the more affordable mid-range systems that have become available. ‘The mid- range systems are now the workhorses,’ he remarked. ‘High-end systems are often a little bit slower, while mid-range systems take the spectrum at a glance and require only a few milliseconds to perform a measurement, which makes them less accurate, but also
quicker. These systems are therefore more suitable for production lines where speed is of great value.’ Systems such as Avantes’
Ava-LED and Admesy’s mid-range Hera and Cronus spectrometers are examples of these workhorses for fast-paced quality control. ‘The Hera series is typically used in the visible range from 380-780nm, and is often used in production lines where medium to high luminance levels are measured in quick succession,’ explained Jeffrey Lemmens, Admesy’s sales and support engineer. ‘The Cronus spectrometer is similar to the Hera series, except that it also has a built-
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Avantes
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