Particle analysis by laser mass spectrometry WB-57F instrument overview

Recently, a second version of the Particle Analysis by Laser Mass Spectrosc opy (PALMS) instrument was constructed to fly in the nose of a WB-57F resea rch aircraft, allowing it to make in-situ measurements of stratospheric aer osols. We present here the technical aspects of the design and construction of the PALMS aircraft instrument. These include the development of a robus t and complex data acquisition and control software program, a stable optic al system with in-flight correction, the mechanical packaging required for in-flight operation, a shrouded inlet designed for optimal particle samplin g, and custom and commercial electronics. We also present a brief review of the performance of the PALMS instrument during its first deployment in the WB-57F.