ǂA ǂsingle-beam photothermal interferometer for in situ measurements of aerosol light absorption
Povzetek
We have developed a novel single-beam photothermal interferometer and present here its application for the measurement of aerosol light absorption. The use of only a single laser beam allows for a compact optical set-up and significantly easier alignment compared to standard dual-beam photothermal interferometers, making it ideal for field measurements. Due to a unique configuration of the reference interferometer arm, light absorption by aerosols can be determined directly – even in the presence of light-absorbing gases. The instrument can be calibrated directly with light-absorbing gases, such as NO2, and can be used to calibrate other light absorption instruments. The detection limits (1σ) for absorption for 10 and 60 s averaging times were determined to be 14.6 and 7.4 Mm−1, respectively, which for a mass absorption cross section of 10 m2 g−1 leads to equivalent black carbon concentration detection limits of 1460 and 740 ng m−3, respectively. The detection limit could be reduced further by improvements to the isolation of the instrument and the signal detection and processing schemes employed.
Ključne besede
aerosol;aerosol absorption;black carbon;photo-thermal interferometer;climate change;
Podatki
| Jezik: | Angleški jezik |
|---|---|
| Leto izida: | 2020 |
| Tipologija: | 1.01 - Izvirni znanstveni članek |
| Organizacija: | UNG - Univerza v Novi Gorici |
| UDK: | 53 |
| COBISS: |
44630531
|
| ISSN: | 1867-1381 |
| Št. ogledov: | 1913 |
| Št. prenosov: | 61 |
| Ocena: | 0 (0 glasov) |
| Metapodatki: |
|
Ostali podatki
| URN: | URN:SI:UNG |
|---|---|
| Vrsta dela (COBISS): | Delo ni kategorizirano |
| Strani: | str. 7097-7111 |
| Letnik: | ǂVol. ǂ13 |
| Zvezek: | ǂiss. ǂ12 |
| Čas izdaje: | 2020 |
| DOI: | 10.5194/amt-13-7097-2020 |
| ID: | 12323458 |
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