| Autor: |
Zheng H, Lou M, Dong L, Wu H, Ye W, Yin X, Kim CS, Kim M, Bewley WW, Merritt CD, Canedy CL, Warren MV, Vurgaftman I, Meyer JR, Tittel FK |
| Jazyk: |
angličtina |
| Zdroj: |
Optics express [Opt Express] 2017 Jul 10; Vol. 25 (14), pp. 16761-16770. |
| DOI: |
10.1364/OE.25.016761 |
| Abstrakt: |
A photoacoustic module (PAM) for methane detection was developed by combining a novel 3.2 μm interband cascade light emitting device (ICLED) with a compact differential photoacoustic cell. The ICLED with a 22-stage interband cascade active core emitted a collimated power of ~700 μW. A concave Al-coat reflector was positioned adjacent to the photoacoustic cell to enhance the gas absorption length. Assembly of the ICLED and reflector with the photoacoustic cell resulted in a robust and portable PAM without any moving parts. The PAM performance was evaluated in terms of operating pressure, sensitivity and linearity. A 1σ detection limit of 3.6 ppmv was achieved with a 1-s integration time. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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