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Instrument: MASPR : Multiple-Angle Aerosol Spectrometer Probe
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The Multiple-Angle Aerosol Spectrometer Probe (MASP) determines the size and
concentration of particles from about 0.2 to 20 microns in diameter and the
index of refraction for selected sizes. Size is determined by measuring the
light intensity scattered by individual particles as they transit a laser beam.
Light scattered from particles into a cone from nominally 30 to 50 degrees
forward and 130 to 150 degrees backwards is reflected by a mangin mirror
through a condensing lens to the detectors. A comparison of the signals from
the open aperture detector and the masked aperture detector is used to accept
only those particles passing through the center of the laser beam. The index of
refraction of individual particles can be estimated from the ratio of the
forward to back scatter signals. A calibration diode laser is pulsed
periodically during flight to ensure proper operation of the electronics. The
shrouded inlet minimizes angle of attack effects and maintains isokinetic flow
through the sensing volume so that volatilization of particles is eliminated.

Additional information available at baumgardner.html

[Summary provided by NASA]