Matches in climatepub4-kg for { <http://example.org/resource/ca8de50f-b795-42b7-9301-8baffe2de0f3> ?p ?o ?g. }
Showing items 1 to 13 of
13
with 100 items per page.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 definition "The Acoustic Doppler Current Profiler (ADCP) measures currents beneath a ship while underway. Sound signals sent from the moving ship bounce back to receivers aboard the ship. This provides a profile of water movement relative to the ship-precise modern navigation, allowing the ship's motion to be subtracted from the data. These devices are also used on moorings and profilers and, along with acoustic backscattering, measure animal biomass. Particles in the path of the sound waves, mostly plankton, reflect a small part of the sound energy back toward receivers, allowing researchers to make remote estimates of the sizes and numbers of animals present in the water column. Before the 1970's, the most technologically advanced instrument used to measure water velocity was known as a Doppler speed log. This evolved into the first commercial ADCP, produced in the mid-1970's, which used averaging. Later in the 1970's, the first vessel-mounted ADCP was developed to measure water velocity more accurately and to allow measurement in range cells over a depth profile. As instruments evolved, so did new techniques in Doppler signal processing. Initially, Doppler speed logs used simple analog signal processing methods, which are still used in some commercial speed logs today. However, the first ADCPs incorporated analog-to-digital signal conversion over a narrow communication bandwidth. Around 1990, this technique was developed into broadband signal processing. Since then, broadband ADCPs have been able to generate very accurate, real-time velocity measurements. Additional information available at 'http://www.whoi.edu/instruments/viewInstrument.do?id=819'" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 id "1655520" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_id b56d53ea-511f-486f-b917-26000794ab51 @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_id ff564c87-78f2-47eb-a857-a4bdc0a71ae5 @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_id ffa3a835-903a-462a-adfb-fc0d25ba07d0 @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_label "Acoustic Sounders" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_label "In Situ/Laboratory Instruments" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_label "Instruments" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 path_label "Profilers/Sounders" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 prefLabel "ADCP" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 reference "" @default.
- ca8de50f-b795-42b7-9301-8baffe2de0f3 tag "Instruments" @default.