A classic fruit gum from Hario GmbH & Co. KG, 53105 Bonn, “Goldbär,” fits into a cuvette holder with its dimensions.

Setup for Gold Bears absorption measurement:

Fig. 1. Setup for measuring a red gold bear with the spegg40.

The Raspberry spegg40 LIVIS4003 is screwed onto the SMA port of the light source using a LK12 macro cuvette holder.

Two types of cuvette holders are available as accessories.

Fig. 2 Cuvette holder for spegg40. (left: LK12 for macro cuvettes, right: LK11 for micro cuvettes). The micro cuvette holder has a diaphragm that only allows light to pass through the narrow sample window.

The spectrometer ferrules are connected using a LY04 Y-fiber coupler (2xferrule socket to F-SMA) connector.

Fig. 3 Y-fiber coupler LY04. Ferrule with tubing for NIR radiation.

A reference measurement without a Gold Bears in the cuvette holder is performed using the software included with the Raspberry Pi.

Fig. 3. Reference spectrum black, composed of the radiation component of the broadband UV LED blue, the VIS component of the long-life bulb orange, and the NIR component of the long-life bulb green.

Below 250 nm, the radiation intensity is low.

Fig. 4. Detail from the reference measurement (Fig. 3).

For the absorption measurement, the Gold Bears is placed in the cuvette holder instead of a cuvette (see Fig. 1).

Fig. 5. Absorption spectrum of the Gold Bear.

Since the spegg40 also evaluates low radiation intensities, absorptions above 3 and also in the UV range below 250 nm can be measured.

Fig. 6. Absorptions below 250 nm can be measured with the spegg40 and the broadband UV LED.