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海水温度的测量,是海洋研究中最重要的基本测量之一。所需要的观测精度,通常根据不同的任务和目的而不同。许多情形下能达到±0.1℃已经足够。有时则要求±0.01℃或更高。随着海洋研究和开发的日益发展,迫切需要能有不同精度的可以连续测量、走航直读的数字式测温仪器。目前国内普遍使用的设备尚不能满足这方面的要求。为便于对温度作连续的测量,人们广泛采用性能稳定的铂电阻作感温元件,通过惠斯顿电桥将温度转变成电压信号,由于电桥和铂电阻的非线性,难以给出直读的结果,只好用查鉴定曲线或分段测量等方法。采用热敏电阻作温度补偿的方法也有报导。我们使用了双铂电阻作
Seawater temperature measurement is one of the most important basic measurements in marine research. The required accuracy of observations usually varies according to the mission and purpose. In many cases up to ± 0.1 ° C is sufficient. Sometimes it requires ± 0.01 ℃ or higher. With the continuous development of marine research and development, there is an urgent need for digital thermometers capable of continuous measurement and direct reading with different accuracies. At present, the equipment commonly used in China still can not meet the requirements in this respect. To facilitate continuous measurement of temperature, the widespread use of stable platinum resistance as a temperature sensing element transforms the temperature into a voltage signal via a Wheatstone bridge. Due to the nonlinearity of the bridge and the platinum resistance, it is difficult to give a direct reading The results, had to use check identification curve or sub-measures and other methods. The use of thermistors for temperature compensation has also been reported. We use a double platinum resistor