OPTICAL SMOKE DETECTION ACCORDING TO THE TWO-COLOR PRINCIPLE BY MEANS OF A LIGHT EMITTING DIODE WITH AN LED CHIP FOR LIGHT EMISSION AND WITH A LIGHT CONVERTER FOR CONVERTING PART OF THE EMITTED LIGHT INTO LIGHT OF LONGER WAVELENGTH

摘要

An optical smoke detector using a two-color principle is provided. The smoke detector may include a light emitting diode (LED), and a photosensor spectrally coordinated with the LED. The LED includes an LED chip configured to emit light in a first wavelength range, and a light converter configured to convert part of the emitted light from the LED chip into light in a second wavelength range, wherein the second wavelength range has a spectral half-width having a maximum of 150 nm.