Sastrugi breaking equipment—ripples and waves are often undercut and the surface is hard and unforgiving, with constant minor topographic changes between ridge and trough. The words "sastrugi" and "zastrugi" are Russian-language plurals; the singular is "sastruga" or "zastruga". The form "sastruga" started as the German-language transliteration of the Russian word заструга (plural: заструги). A Latin-type analogica singular "sastrugus" is used in various writings on exploration of the South Pole, including Robert Falcon Scott's expedition's diaries and Ernest Shackleton's "The Heart of the Antarctic". Under the action of steady wind, free snow particles accumulate and drift like the sand grains in barchan
Spherical surface acoustic wave (SAW) sensor above mentioned parameters is very small due to limited path offered to Surface acoustic wave by planar sensor. In case of Spherical sensors surface acoustic wave make several round trips along the equator of a ball as shown in fig, which offer longer paths to Surface acoustic wave hence even smaller change in parameters is amplified with multiple turns, which increases the sensitivity of the sensor considerably. Spherical surface acoustic wave (SAW) sensor Spherical surface acoustic wave sensors use a type of surface acoustic wave (SAW) that travels along the surface of a medium exhibiting elasticity with exponentially decaying amplitude