urn:nasa:pds:context:instrument:pvmp.sp-north.sn 1.0 1.20.0.0 Product_Context 2023-12-11 1.0 Initial creation of the Multiprobe context products urn:nasa:pds:context:instrument_host:spacecraft.pvmp.sp-north instrument_to_instrument_host 10.1109/TGRS.1980.350292 Ragent, B., et al., Pioneer Venus sounder and small probes nephelometer instrument, IEEE Trans. Geosci. Rem. Sens., GE-18, No. 1, 111-116, doi:10.1109/TGRS.1980.350292, Jan. 1980. reference.RAGENTETAL_1980 PIONEER VENUS SMALL PROBE (NORTH) NEPHELOMETER Nephelometer not applicable not applicable INSTRUMENT OVERVIEW =================== This experiment consisted of a nephelometer to measure the energy backscattered from cloud particles. It used a pulsed gallium arsenide laser diode to illuminate the clouds. The altitude history of the backscattered signal indicated the presence and vertical extent of clouds along the trajectory. Comparisons with the measurements from the other Probes indicated the spatial variability of the cloud structure. The laser operated at about 9000 A. The experiment weighed about 0.6 kg and used about 1.3 W of power.