WORKING HEAD OF AN LED MINI-SPECTROMETER

Proposed is a working head of a light emitting diode mini-spectrometer for determining the chemical composition of a substance under analysis in the form of a solid monolithic or fluent substance or a combination thereof, said working head comprising a housing of the LED mini-spectrometer head, which contains an LED emitter and a broadband photodiode that are mounted on a common circuit board. The LED emitter is designed to be capable of generating radiation in a range of 900-2500 nm and directing said radiation at the substance under analysis. The broadband photodiode is designed to be capable of receiving radiation from the LED emitter after said radiation has interacted with the substance under analysis. The LED emitter contains at least six LED chips mounted on the circuit board such that the LED chips are arranged in a circle around the broadband photodiode. The housing of the LED mini-spectrometer head is configured in the form of a half-sphere such that the housing has a spherical side, the inside surface of which is mirrored, and a flat side, and the broadband photodiode is situated in the focus of the spherical side of the housing of the LED mini-spectrometer head. The circuit board on which the LED chips and the photodiode are mounted is an annular circuit board arranged parallel to the flat side of the housing of the LED mini-spectrometer head. The LED chips are situated on the side of the annular circuit board that faces toward the flat side of the housing of the head, and the broadband photodiode is situated on the opposite side of the annular circuit board. At least four LED chips have emission spectrum maxima at different wavelengths. L'invention concerne une tête de travail de minispectromètre à LED servant à déterminer la composition chimique d'une substance à analyser consistant en une substance solide monolithique ou pulvérulente ou leur combinaison, laquelle comprend un corps de tête de minispectromètre à LED dans lequel sont disposés un émetteur LED et une photodiode à bande large agencés sur une plaque commune. L'émetteur LED peut générer un rayonnement dans une plage de 900-2500 nm et diriger son rayonnement vers la sustance à analyser. La photodiode à bande large peut recevoir un rayonnement de l'émetteur LED après interaction de ce rayonnement avec la sustance à analyser. L'émetteur LED comprend au moins six puces à LED montées sur ladite plaque de sorte que les puces à LED soient disposées sur la périphérie autour de la photodiode