Simultaneous transmission and absorption photometry of carbon-black absorption from drop-cast particle-laden filters.

ABSTRACT: Simultaneous transmissivity and absorptivity measurements were carried out in the visible at a laser wavelength of 532 nm on drop-cast, carbon-black-laden filters under ambient (laboratory) conditions. The focus of this investigation was to establish the feasibility of this approach to estimate the mass absorption coefficient of the isolated particles and compare results to earlier work with the same carbon-black source. Transmissivity measurements were carried out with a laser probe beam positioned normal to the particle-laden filter surface. Absorptivity measurements were carried out using a laser-heating approach to record in time the sample temperature rise to steady-state and decay back to the ambient temperature. The sample temperature was recorded using a fine-wire thermocouple that

SUBMITTER: Presser C 

PROVIDER: S-EPMC6774385 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature