Increase of noise immunity of laser smoke fire detectors

• Autorzy: Kitsak A. , Esipovich D. , Poliakov V.
• Języki publikacji: EN

Abstrakty

EN

The article describes of the optical system of the proposed smoke detector construction, in which lightening of a smoke chamber is made by a focused laser beam having, according to the periodic law, a modulated spatial distribution of radiation intensity in the focal spot. This structure of the light field in the smoke flow allows to generate the algorithm of signals selection produced by the smoke particles with characteristic sizes and velocities. The result is increased stability of the smoke detector under the influence of external noise such as dust, vapor with different sizes of smoke particles and/or velocities. There are carried out model experiments on registration of time signals that are generated by particles of different sizes, crossing the plane of the beam focusing. The spectral characteristics of the recorded signals are researched. There are identificated possible algorithms for selection of signals generated by micro formations with specified medium size and speed of movement.

Słowa kluczowe

EN

noise immunity; laser radiation; external interference; differential scheme of smoke particles registration

• Wydawca: Szkoła Główna Służby Pożarniczej
• Czasopismo: Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
• Rocznik: 2011
• Tom: Nr 42
• Strony: 123--126
• Opis fizyczny: Bibliogr. 2 poz., rys.

Twórcy

autor

Kitsak A.

• Research Institute of Fire Safety and Emergencies of the Ministry for Emergency Situations of the Republic of Belarus

autor

Esipovich D.

• Research Institute of Fire Safety and Emergencies of the Ministry for Emergency Situations of the Republic of Belarus

autor

Poliakov V.

• Research Institute of Fire Safety and Emergencies of the Ministry for Emergency Situations of the Republic of Belarus

Bibliografia

• [1] Pinnacle Laser Technology Smoke Detector, www.systemsensor.com/pdf/A05-1028.pdf
• [2] Rinkevichus B.S.: The Doppler method of local velocities measuring using lasers / / UFN .- 1973 .- .- T.111, Issue 2 .- p. 305–307.