Zastosowanie laserów kaskadowych (QCL) do detekcji śladowych ilości gazów

• Autorzy: Miczuga M. , Głogowski P. , Kubacki J. , Kwaśny M. , Kopczyński K.

Warianty tytułu

EN

Application of Quantum Cascade Lasers (QCL) for trace gas detection

• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono przykład zastosowania laserów kaskadowych do detekcji śladowych ilości gazów. Dzięki zastosowaniu laserów kaskadowych możliwe jest dopasowanie długości fali emitowanego promieniowania laserowego do widma absorpcji badanych gazów. System detekcji gazów zbudowano w oparciu o lasery kaskadowe generujące wiązkę promieniowania IR o długości fali 5,25 oraz 7,85 µm, komorę wielokrotnych przejść typu White'a i układ detekcji promieniowania laserowego zbudowany w oparciu o szybką, fotodiodę firmy Vigo System. W systemie detekcji gazów wykorzystywano metodę bezpośredniej spektroskopii absorpcyjnej i przestrajaniem wewnątrzimpulsowym, w której długość fali promieniowania IR emitowanego przez laser kaskadowy ulega zmianie w czasie trwania impulsu lasera. W metodzie tej laser generuje długie impulsy promieniowania (rzędu 500 ns - kilku µs), a widmo absorpcyjne uzyskiwane jest w czasie jednego impulsu lasera. Działanie systemu pokazano na przykładzie wyników badań roztworu tlenku azotu (II) oraz metanu.

EN

The article presents application of on quantum cascade lasers QCL for trace gas detection. Quantum cascade lasers enables adjust radiation wavelength to absorption spectrum of measured gas. Designed gas detection system is based on quantum cascade laser QCL (wavelength 5,25 µm and 7,85 µm), multipass cell (White cell configuration) and detection system based on fast photovoltaic (Vigo Systems). Intrapulse absorption spectroscopy for gas detection was used in the measurements. When a long excitation pulse is applied to a QC laser, the laser frequency tunes almost linearly to lower wave number (lower frequency) as a function of time so all absorption spectral elements are recorded during a single laser pulse. In the present paper, the method was introduced, and identification of NO and methane spectral fingerprint using this spectroscopy was demonstrated experimentally.

Słowa kluczowe

PL

laserowa spektroskopia absorpcyjna; lasery kaskadowe; detekcja gazów; spektroskopia w podczerwieni; optoelektronika

EN

laser absorption spectroscopy; quantum cascade laser; trace gas detection; IR spectroscopy; optoelectronics

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Elektronika : konstrukcje, technologie, zastosowania
• Rocznik: 2010
• Tom: Vol. 51, nr 10
• Strony: 46--50
• Opis fizyczny: Bibliogr. 44 poz., wykr.

Twórcy

autor

Miczuga M.

autor

Głogowski P.

autor

Kubacki J.

autor

Kwaśny M.

autor

Kopczyński K.

• Wojskowa Akademia Techniczna, Instytut Optoelektroniki, Warszawa

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