FEATURE SPECTROSCOPY
Admesy offers spectrometers for both high speed industrial analysis and highly accurate research and development applications
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said. ‘This can save energy, as the LEDs can be turned off when they’re not adding anything to growth.’ Plants have a saturation point where
they can’t absorb any more energy, and spectrometers play a role in managing the light input. ‘The sunlight can be measured using a spectrometer, along with the artificial light coming from the LEDs,’ explained Langston. The plant can also be analysed for chlorophyll absorbance. ‘You can then see how much light is being turned into energy by measuring the difference between what’s coming in and what’s being absorbed by the plant,’ he added. By monitoring light input with
spectroscopy, horticulturists are able to predict and regulate growing cycles. ‘Rather than having to rely on natural sunlight and not know whether produce will ripen over five days or 10, customers
can be told exactly when they’ll receive their order. It really improves the efficiency of the whole fresh produce supply chain,’ Langston said.
Ocean Optics supplies a range of spectrometers for horticultural applications. The company is developing a new handheld spectroscopy system that uses its STS micro spectrometer and works alongside an android app. The system measures 42 x 42mm and can fit in a pocket. The device, currently still in beta testing, measures the full spectrum along with parameters such as lux, colour temperature and colour changes. ‘We are also developing it to also measure attributes and indexes that are specific to the horticulture industry, such as PAR,’ said Langston. The photosynthetically active radiation
(PAR) region refers to the spectral range between 400nm and 700nm that plants
respond to when photosynthesising. ‘The PAR index was originally developed as a very simple ratio of two wavebands that only required two photodiodes to measure,’ explained Langston. ‘Now people understand the rich information that can be obtained from spectra, which tells us
“As LEDs have swept the world … the old [analysis] tools don’t measure accurately anymore”
a lot more about what’s going on, rather than providing a crude approximation.’ While PAR is still used as a measurement within horticulture, a greater depth of spectral information can now be obtained via spectrometry. LED systems can be measured through their total amount of optical power (lux), irradiance at
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