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METHOD FOR DETECTING A FIRE ACCORDING TO THE SCATTERED LIGHT PRINCIPLE WITH A STAGGERED ADDITION OF A FURTHER LED UNIT FOR RADIATING IN FURTHER LIGHT PULSES WITH DIFFERENT WAVELENGTHS AND SCATTERED LIGHT ANGLES, AND SUCH SCATTERED LIGHT SMOKE DETECTORS
METHOD FOR DETECTING A FIRE ACCORDING TO THE SCATTERED LIGHT PRINCIPLE WITH A STAGGERED ADDITION OF A FURTHER LED UNIT FOR RADIATING IN FURTHER LIGHT PULSES WITH DIFFERENT WAVELENGTHS AND SCATTERED LIGHT ANGLES, AND SUCH SCATTERED LIGHT SMOKE DETECTORS
Various embodiments may include a method for fire detection comprising: radiating light at a first wavelength into a scattered light volume and measuring a radiation intensity generated by forward scattering; radiating light at a second wavelength and measuring a second scattered radiation intensity generated by forward scattering; determining a first quotient from the scattered radiation intensities and comparing it to a first and second value; and if the first quotient lies between the first and the second value: radiating pulses at the second wavelength into and measuring a third intensity generated by backward scattering; determining a second quotient from the first and third scattered radiation intensity and comparing the second quotient with a third value; and generating a fire alarm if the second quotient exceeds the third comparison value.
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