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Photo-Thermal Interferometry (PTI) Particulate Absorption Monitor

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-SC0018463
Agency Tracking Number: 0000234716
Amount: $225,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: 23c
Solicitation Number: DE-FOA-0001770
Solicitation Year: 2018
Award Year: 2018
Award Start Date (Proposal Award Date): 2018-04-09
Award End Date (Contract End Date): 2019-01-08
Small Business Information
45 Manning Road
Billerica, MA 01821-3976
United States
DUNS: 030817290
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Andrew Freedman
 (978) 663-9500
Business Contact
 James Akimchuck
Phone: (978) 932-0265
Research Institution

Understanding the role that aerosols play in atmospheric radiative forcing is currently the major focus of the Department of Energy (DOE) Atmospheric Sciences Program- Aerosol particles affect the radiative balance of the earth directly, by scattering and absorbing solar and terrestrial radiation, and indirectly, by acting as cloud condensation nuclei- It is now recognized that the atmospheric loading of aerosols generated through human activities, especially combustion, can exert an influence on the earth’s radiation budget comparable in magnitude with greenhouse gases- This proposal addresses the specific issue of accurate measurement of aerosol absorption- We propose to design, build and test an optical absorption monitor based on the use of photothermal interferometry monitor- In this technique, absorbing particles are heated by a modulated excitation laser producing a small temperature change in the surrounding air- This temporary change in temperature is recorded as a change in the refractive index as measured by an interferometer- A major advantage of this technique is that the modulation frequency of the excitation laser can be varied so as to avoid acoustic noise, an issue for instruments deployed on aircraft and ground-based vehicles-

* Information listed above is at the time of submission. *

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