Particle Measurement

Particulate matter in the atmosphere has strong influences on climate change, human health and visibility. Measurements of particulate mass loadings, optical properties, size distributions and chemical composition are needed to understand and control these impacts. Aerodyne produces multiple instruments for particle measurements, ranging from research grade time-of-flight  aerosol mass spectrometers to routine monitoring packages.

The Aerodyne Aerosol Mass Spectrometer (AMS) is the only currently available instrument capable of providing size and chemical mass loading information in real-time for non-refractory sub-micron aerosol particles. The AMS couples size-resolved particle sampling and mass spectrometric techniques into a single real-time measurement system. The Aerodyne AMS has been deployed world-wide at fixed sites, and on mobile laboratory, ship and aircraft platforms. More than 100 instruments are in use in industrial, academic and government laboratories.

The Aerodyne Aerosol Chemical Speciation monitor (ACSM) measures particle mass loading and chemical composition in real-time for non-refractory sub-micron aerosol particles. Smaller, lower cost and more robust than our AMS instruments, the ACSM is designed for long-term unattended deployment and routine monitoring applications.

The Aerodyne CAPS PMex Monitor provides an accurate and precise measurement of the optical extinction (the sum of absorption and scattering) of ambient particles.  Based on the cavity attenuated phase shift technique, the monitor provides a level of detection (3-sigma) of better than 2 Mm-1 with a 1 second time response.   The monitor can be operated in a completely autonomous mode without the need for any user intervention or consumables except for electrical power (<50 W).  A choice of wavelengths (450, 530 or 630 nm) is currently available; operation at 365 nm (at reduced sensitivity) will be available shortly.

The Soot Particle Aerosol Mass Spectrometer (SP-AMS) uses laser-induced vaporization to make real-time, in situ measurements of black carbon containing particles.  Both the carbon cores and any organic or inorganic coatings are detected quantitatively

The Micro-Orifice Volatilization Impactor Chemical Ionization Time of Flight Mass Spectrometer (MOVI-CI-TOFMS) uses chemical ionization mass spectrometry for highly sensitive and selective detection of organic species.  The unique MOVI inlet allows measurement of both particle-phase and gas-phase compounds. The MOVI-CI-TOFMS is being developed in collaboration with Professor Joel Thornton at the University of Washington, Seattle.

The Laser Ablation Aerosol Particle Time-of-Flight (LAAPTOF) instrument is a new single particle laser ablation aerosol mass spectrometer developed in connection with Aeromegt  and Tofwerk  and provides sizing and true bi-polar single particle mass spectra for micron and submicron sized aerosol particles.

The Thermal Desorption Aerosol Gas Chromatograph AMS (TAG-AMS) is a combined technology approach adding gas-chromatographic organic aerosol measurement capability to the standard AMS.  The TAG-AMS project is a collaborative development between ARI, Professor Allen Goldstein at UC Berkeley and Dr. Susanne Hering at Aerosol Dynamics, Inc.

Under Development

In adition to the standard aerosol mass spectrometer systems listed above, ARI is actively engaged in designing and promoting other advanced technology aerosol instrumentation and and in developing new detection modules for the AMS.  Many of our development projects are collaborations and partnerships with other leading scientists from both acedemia and  industry.

The compact-Time-of-Flight Aerosol Chemical Speciation Monitor (ccTOF-ACSM) is a time-of-flight mass spectrometer version of the ACSM.  This instrument has an application where small instrument size is important (as with the ACSM) but faster time resolution and higher sensitivity are required, such as when operating from an aircraft platform.  The ccTOF is a cost-effective compact ToF mass spectrometer designed by Tofwerk.