A CTD instrument is an oceanography sonde (French for probe) used to measure the electrical conductivity, temperature, and pressure of seawater. The pressure is closely related to depth. Conductivity is used to determine salinity. The CTD may be incorporated into an array of Niskin bottles referred to as a carousel or rosette.

A CTD — an acronym for Conductivity, Temperature, and Depth — is the primary tool for determining essential physical properties of sea water. It gives scientists a precise and comprehensive charting of the distribution and variation of water temperature, salinity, and density that helps to understand how the oceans affect life.

A CTD is a series of small probes that can be deployed independently or incorporated into a variety of observing platforms such as remotely operated vehicles, gliders, or fixed observing buoys. On exploration vessels, a CTD is often attached to a larger metal water sampling array known as a rosette that is lowered into the water via a cable.

The model SD204 is also called CTD profiler, STD profiler, Sound Velocity profiler, CTD Instrument and CTD Sonde. The SD204 measures, calculates and records sea water conductivity, salinity, temperature, depth (pressure), sound velocity and water density.

La sonda CTD è un dispositivo che contiene la strumentazione necessaria per la misura della Conduttività elettrica (C), della Temperatura (T) e della Profondità (D) dell'acqua. Allo stato attuale la maggioranza dei CTD è pensata e realizzata per il monitoraggio di vari parametri fisici, chimici e biologici nell'ambito degli studi oceanografici.

2013年7月26日 · The OpenCTD–a conductivity-temperature-depth (or CTD) sonde is considered the ‘work-horse’ of oceanography. Three relatively simple probes constitute the CTD and allow researchers to make basic water quality measurements.

Der Name CTD kommt aus dem Englischen von C onductivity T emperature D epth oder deutsch Leitfähigkeit Temperatur Tiefe. Aus der Leitfähigkeit kann der Salzgehalt des Wassers berechnet werden, die Tiefe wird mit Drucksensoren bestimmt. Die CTD wird zusammen mit einem Satz von Wasserschöpfern an einem Draht vom Schiff aus hinabgefiert.

2025年2月3日 · Conductivity, Temperature, Depth (CTD) sensors are specialized devices used to measure the electrical conductivity, temperature, and depth of seawater. By gauging these three parameters, users of CTD profilers can infer various other properties of seawater (such as salinity and density) which are vital for understanding oceanographic processes.

2021年5月6日 · Un CTD – acronyme de conductivité, température et profondeur – est le principal instrument utilisé pour déterminer les propriétés physiques essentielles de l’eau de mer. Il fournit aux scientifiques une représentation précise et complète de la distribution et de la variation de la température, de la salinité et de la densité ...

A CTD is so named as it measures Conductivity, Temperature and Depth. These parameters can then be used to calculate salinity and density. There are a variety of CTDs within the OOI program with unique capabilities. Some CTDs are configured with inductive communication (CTDMO), a pump to control flow through…