Broadband infrared LED helps farmers plan harvest time

December 12, 2018 // By Julien Happich
Broadband infrared LED helps farmers plan harvest time
Osram's new Oslon Black SFH 4736 near-infrared LED (NIRED) offers more than double the radiant intensity of its predecessor so as to enable better irradiation and spectroscopy readings.

Determining fruit ripeness in this way is made possible by near-infrared spectroscopy. This involves irradiating a specimen with a defined spectrum of light and a using a spectrometer to measure the wavelength distribution of the reflected light. Simply scanning fruit or cereal crops with the NIRED installed in a smartphone or tablet produces reliable information about the sugar, water and fat content, enabling farmers in the field or vineyard owners to easily monitor the progress of their crops in real time so they can plan the ideal time for the harvest.

The SFH 4736 offers a narrow beam angle. The lens ensures strong directional light, improving overall system efficiency. The primary optics bundle 90 percent of the generated light within a beam angle of +/-40°, providing considerably more optical power per unit area on the target object. As a result, more light is reflected to the spectrometer, leading to a stronger measured signal. Up to now, separate optics were needed to focus the light. With this new emitter this is no longer necessary, which reduces the costs for assembly, adjustment and design in the overall system.

Like its SFH 4735 predecessor, the SFH 4736 is based on a highly efficient, blue-emitting chip in UX:3 technology. A phosphor converter specially developed for this application converts the blue into infrared light with a wavelength range of 650nm to 1050nm. SFH 4736 is 2.3 mm high and has a footprint of 3.75x3.75mm, comparable to that of the SFH 4735.

Osram Opto Semiconductors - www.osram-os.com


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