@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix dcterms: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix sdo: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . @prefix xsd: . rdf:type sdo:DefinedTerm ; sdo:description "A sub-bottom profiling sonar operating at 7.5 kHz, designed to detect soft sediment thickness and layering beneath the sea bed. The instrument was manufactured by the Institute of Oceanographic Sciences, Deacon Laboratory (now National Oceanography Centre, Southampton). It has a pulse length of 0.26 ms, and a penetration range of up to 70 m over soft sediment at a resolution of less than 1 m. The instrument has a transducer which operates with a conical beam pattern of 25 degrees. This instrument was fitted on TOBI, a deep-towed multi-sensor sonar system deployed in 1999 during cruise JR39b."@en ; sdo:inDefinedTermSet ; sdo:name "Institute of Oceanographic Sciences 7.5 kHz profiling sonar"@en ; sdo:termCode "SDN:L22::TOOL1265" .