Abstract

The Colorado State University Aerosol Workshop provided an excellent opportunity to obtain various particulate samples collected on filters. Our results indicate that the photoacoustic technique is preferable to the transmission technique (integrating plate method) for ambient samples with low-filter loadings since the presence of a nonabsorbing scattering aerosol (ammonium sulfate) only slightly perturbs the photoacoustic signal and significantly affects the transmitted signal. Measurements indicate that the photoacoustic signal depends not only on the energy absorbed from the incident beam but also on the existence of thermal wave interference effects and, especially for heavily loaded filters, on the presence of a nonabsorbing scattering aerosol.

© 1982 Optical Society of America

Diffuse reflectance and diffuse transmission measurements of aerosol absorption at the First International Workshop on light absorption by aerosol particles

E. M. Patterson and B. T. Marshall
Appl. Opt. 21(3) 387-393 (1982)

Photoacoustic determination of optical properties of aerosol particles collected on filters: development of a method taking into account substrate reflectivity

R. Röhl, W. A. McClenny, and R. A. Palmer
Appl. Opt. 21(3) 375-381 (1982)

Measurement of particle optical absorption, imaginary refractive index, mass concentration, and size at First International LAAP Workshop

Antony D. Clarke and Alan P. Waggoner
Appl. Opt. 21(3) 398-402 (1982)

Effects of filter internal reflection coefficient on light absorption measurements made using the integrating plate method

Antony D. Clarke
Appl. Opt. 21(16) 3021-3031 (1982)

Gas-phase photoacoustic determination of the total carbon content of aerosol deposits

Joachim D. Pleil, George M. Russwurm, and William A. McClenny
Appl. Opt. 21(1) 133-135 (1982)