To improve the knowledge of single-scattering properties of atmospheric ice crystals and to provide an unique data set to aid the validation and improvement of scattering models led to the development of the particle habit and polar scattering probe (PHIPS-HALO). The PHIPS-HALO is a combination of a particle imager and a polar nephelometer. Two cameras take stereoscopic images of single cloud particles that can be used to reconstruct the particle morphology (or shape) and orientation with respect to the laser beam - an information important for the modeling aspects. Simultaneously the angular scattering function from 18° to 170° is measured with the angular resolution of 8°.
In this contribution we will show the operation principle of the PHIPS-HALO instrument and discuss the first results from cloud chamber tests and from field campaigns. The PHIPS-HALO was successfully operated onboard the German HALO aircraft during the ACRIDICON-CHUVA campaign in Brazil in 2014. We will present an unique dataset of the combined microphysical and scattering properties of tropical ice crystals. We will also discuss the application of the instrument to discriminate between ice particles and liquid droplets in mixed-phase clouds and give an insight to the plans for further instrument developments to broaden the knowledge of the optical properties of cloud particles.