Comparison of the fall rate and structure of recent T-7 XBT manufactured by Sippican and TSK
Comparison of the fall rate and structure of recent T-7 XBT manufactured by Sippican and TSK
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DOI：
10.5194/os-7-231-2011
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发表时间：
2010-10
期刊：
影响因子：
3.2
通讯作者：
S. Kizu;C. Sukigara;K. Hanawa
中科院分区：
文献类型：
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作者：
S. Kizu;C. Sukigara;K. Hanawa
摘要。在日本东部海域，利用校准后的电导率温度深度剖面仪（CTD）进行了一系列同步测量，评估了最新的T-7消耗性深海温度记录仪（XBT; 760 m）的下降速率。重点放在比较目前两家制造商洛克希德·马丁公司和tsuumi Seiki公司生产的T-7的坠落率上，这两家制造商被认为是相同的，但从未直接比较过。研究发现，两家制造商的T-7下降速度相差约3.5%。Sippican T-7的下降速度比Hanawa等人（1995）的下降速率方程（FRE）给出的下降速度慢约2.1%，而TSK T-7的下降速度快约1.4%。通过应用传统的二次形式方程d(t)=at - bt2，其中d为深度，单位为米，t为经过的时间，单位为秒，根据海上试验估计的下降率系数为LMS t -7的a=6.553 （m s−1）和b=0.00221 (m s−2)，TSK t -7的a=6.803 （m s−1）和b=0.00242 （m s−2）。通过对探针的详细检查，我们发现两家公司的T-7具有不同的总重量和许多结构差异。由于坠落率的差异大约是重量差异的两倍（约2%），因此可以推断，结构上的差异对坠落率的差异有相当大的影响。我们的结果清楚地表明，两家公司最近的T-7需要进行区分。
Abstract. The fall rate of recent T-7 expendable bathythermograph (XBT; 760 m) is evaluated based on a series of concurrent measurement with a calibrated Conductivity Temperature Depth profiler (CTD) in the sea east of Japan. An emphasis is placed on comparing the fall rates of T-7 produced by the two present manufacturers, the Lockheed Martin Sippican Inc., and the Tsurumi Seiki Co. Ltd., which have been believed to be identical but had never been compared directly. It is found that the two manufacturers' T-7 fall at rates different by about 3.5%. The Sippican T-7 falls slower than given by the fall-rate equation (FRE) of Hanawa et al. (1995) by about 2.1%, and the TSK T-7 falls faster by about 1.4%. The fall-rate coefficients estimated based on the sea test by applying the equation of traditional quadratic form, d(t)=at−bt2 where d is depth in meters and t is the time elapsed, in seconds, are a=6.553 (m s−1) and b=0.00221 (m s−2) for the LMS T-7, and a=6.803 (m s−1) and b=0.00242 (m s−2) for the TSK T-7. By detail examination of the probes, we found that the two companies' T-7 have different total weight and many structural differences. Because the difference in the fall rate is about twice larger than the difference in weight (about 2%), it is inferred that the structural differences give sizable impact to the difference in their fall rates. Our results clearly show that the recent T-7 of the two companies needs to be discriminated.