An instrument for simultaneously measuring the vertical distribution of salinity and temperature. STDs come in two types: those with built-in recorders and those that are placed on board and linked to a computer. A platinum resistance thermometer is used as the temperature sensor, with an accuracy of 0.01°C. The development of the STD, which can simultaneously and continuously measure salinity, water temperature, and depth, is one of the breakthroughs in the history of marine observation. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
塩分と温度の鉛直分布を同時に測定するための測器。 STDには記録部を内蔵するものと,船上に置きコンピュータと連動させるものとがある。感温装置としては白金抵抗温度計が用いられており,0.01℃の精度がある。塩分,水温,深度の3つを同時に,しかも連続的にはかれる STDの開発は,海洋観測史上画期的な出来事の一つである。
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