基于DPHP技术测量沉积物热导率的数据处理
李官保,刘保华,丁忠军
国家海洋局 第一海洋研究所,山东 青岛 266061
DATA PROCESSING TECHNIQUE FOR DUAL-PROBE HEAT-PULSE METHOD TO DETERMINE THERMAL CONDUCTIVITY OF MARINE SEDIMENTS
LI Guan-Bao, LIU Bao-Hua, DING Zhong-Jun
First Institute of Oceanography, SOA, Qingdao 266061,China
摘要 双针热脉冲(DPHP)技术被用于原位测定海洋沉积物的热导率。数据处理过程直接决定从实测数据中提取热导率的精度与效率。根据实测数据,结合海上测量可能出现的问题,探讨了DPHP技术实测数据的处理方法,提出了一套数据预处理流程,并对2种热导率计算模型和计算方法进行了对比分析。研究表明,原始数据经过数据滤波、数据截取和背景场拟合剔除等预处理过程,得到的热脉冲温度响应曲线可用于热导率计算。计算热导率可采用KB模型或者简化模型,后者具有降低运算量,减小误差积累的优点。热导率计算方法有极值法和拟合法,如果采样率足够高,极值法是首选方法。
Abstract :Dual-Probe Heat-Pulse method was modified for application of determining in-situ thermal conductivity of marine
sediments. It was crucial to process DPHP data and extract thermal conductivity from these data. A processing flow was
established based on measured data with consideration of the specific measurement situations at sea. The pre-processing
procedure, including filtering, trimming, and ambient temperature fitting and eliminating, was suggested in order to obtain a
temperature response curve of heat pulse, which was then utilized to calculate thermal conductivity. Besides the K-B model, a
simplified model to calculate thermal conductivity was advanced which has advantage in reducing operation and cumulative error.
By comparing the two thermal conductivity calculation methods, extremum method and fitting method, it was proposed that the
extremum method will be the first choice so long as the sampling rate was high enough.
收稿日期: 2008-12-05
出版日期: 2009-12-10
基金资助: 863计划项目(2004AA616060,2006AA09A203)资助
通讯作者:
李官保(1976-),男,副研究员,研究方向:海洋地球物理与海底构造。
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