Other Example Applications

There are a wide range of potential applications for the Sagitto system. We've created the following demonstration models to give a small taste of how our miniature near-infrared spectroscopy system can be used to either quantify or classify materials. in just a few seconds.






Battery powered and controlled by Bluetooth, the Sagitto miniature NIR spectrometer fits in the palm of your hand.

A sophisticated NIR spectrometer : very small, portable, yet every bit as powerful as bench-top alternatives.

New Zealand has an extensive hop breeding history that has created hops with unique flavour characteristics

New Zealand hops, ripening in sunny Nelson

Alpha Acids in Hops

The female flowers - or 'cones' - on hop vines are rich in terpenoid essential oils and terpenophenolic resins. These 'alpha acids' give hops their characteristic bitter flavour. Hops with a higher percentage alpha acid content will contribute more bitterness than a lower alpha acid hop when using the same amount of hops.

The total alpha acid percentage varies between varieties and within specific varieties (depending on factors such as seasonal growing conditions, drying methods, and the point at which the hops are harvested.)

This demonstration model measures the percentage of alpha acids in hop trichomes, using near-infrared (NIR) spectroscopy (900nm-1700nm).

Dried Herbs

We refer to this model as our 'Scarborough Fair' model - it classifies dried herb samples into parsley, sage, rosemary, and thyme (and a few others ;-)


Each dried herb sample has a unique NIR fingerprint.


Not all dried herbs are what they claim to be. Some are adulterated with cheaper substitutes.

NIR spectroscopy can be used to select the optimum roasting degree, and ensure consistent roasting between batches.

Coffee Roasting Degree

This model classifies ground coffee beans according to the coffee roaster, and the batch. Its not a very useful model in itself, but it does illustrate how near infrared spectroscopy can be used by more technically sophisticated coffee roasters to ensure that they produce an objectively consistent product.

Many specialised coffee roasters change their blends according to availability of particular beans. For example, the graph at left shows how the 'Rocket Espresso' house blend at Rocket Coffee changed when they altered the mix of beans in the 31 October roast, and then again when the blend was changed for the 4 November roast.

Plastic Polymer Recycling Codes

This demonstrates a classification model for plastic polymers, using near-infrared (NIR) spectroscopy data. As you can see from the graph at right, different types of plastic polymers have quite different absorption spectra in the 900nm - 1700nm wavelength range. Sagitto is able to use these differences to build very accurate classification models, using sophisticated machine learning techniques.

Recycling Number Abbreviation Polymer Name
1 PET Polyethylene terephthalate
2 HDPE High-density polythylene
3 PVC Polyvinyl chloride
4 LDPE Low-density polythylene
5 PP Polypropylene
6 PS Polystyrene



NIR is an excellent technique for identifying plastic polymers for recycling purposes.