Patent ID: 8047055

Claim:
An instrument for measuring size segregated mass concentration of an aerosol, comprising: a first inlet for intake of an incoming aerosol flow stream containing incoming particles, the inlet including a first adjustable inlet portion that enables passage of selected particles of the incoming particles, the selected particles having a size range; a first chamber operably coupled to the adjustable inlet portion, the chamber for reception of an aerosol flow stream containing the selected particles and for reception of a first beam of electromagnetic radiation for intersection with the selected particles within the first chamber; a first detector in communication with the first chamber, the first detector for detection of electromagnetic radiation scattered as a result of the intersection in the chamber of the selected particles with the first beam of electromagnetic radiation, the first detector for delivery of a first detector output signal; a second detector in communication with the first chamber, the second detector for detection of electromagnetic radiation scattered as a result of the intersection in the chamber of the particles with the first beam of electromagnetic radiation, the second detector for delivery of second detector output signal representative of a second characteristic of the scattered electromagnetic radiation; and a control system in communication with the first detector, the control system for reception of the first detector output signal and for determination of a size-segregated mass concentration of the incoming aerosol flow stream based upon the first detector output signal and the size range of the selected particles.