海洋沉积物热电声物性探测系统研究

Study on Thermoelectric Acoustic Property Detection System of Marine Sediments

海洋沉积物取样测量会改变沉积物的温度、压力等参数,取样测量所得到的数据会与沉积物的真实参数有所差距。针对上述问题本文开展了海洋沉积物热、电、声探测技术研究,并设计了一款适用于深潜器的海洋沉积物原位热、电、声多参数探针。探针使用时差法测量沉积物中的声速、声衰减系数,使用温纳法测量沉积物的电导率参数,使用NTC热敏电阻作为温度传感器测量沉积物温度。在探针校准并对沙质沉积物进行测量。实验结果表明:探针测量电导率标准误差小于2.8%。温度测量误差小于0.28℃,温度测量时间不小于120 s,此次获取泥沙样品的声速为1737.5 m/s,声衰减系数2.5 dB/m。实验结果显示该探针能够准确、快速地测量海洋沉积物的热、电、声参数。

Marine sediment sampling and measurement will change the temperature,pressure and other parameters of the sediment,and the data obtained by sampling and measurement will be different from the real parameters of the sediment.Marine sediment sampling and measurement will change the temperature,pressure and other parameters of the sediment,and the data obtained by sampling and measurement will be different from the real parameters of the sediment.In view of the above problems,this paper carried out research on the thermal,electrical and acoustic detection technology of marine sediments,and designed an in-situ thermal,electrical and acoustic multi-parameter probe of marine sediments suitable for deep-sea submersible.The probe used the time difference method to measure the sound velocity and sound attenuation coefficient in the sediment,the Wenner method to measure the conductivity parameters of the sediment,and the NTC thermistor as a temperature sensor to measure the temperature of the sediment.Sandy sediments were measured after probe calibration.The experimental results show that the acoustic velocity of the sediment samples is 1588.1 m/s and the acoustic attenuation coefficient is 2.5 dB/m.The standard error of the probe is less than 2.8%.The temperature measurement error is less than 0.28℃,and the temperature measurement time is not less than 120 seconds.The experimental results show that the probe can accurately and quickly measure the thermal,electrical and acoustic parameters of marine sediments.In view of the above problems,this paper carried out research on the thermal,electrical and acoustic detection technology of marine sediments,and designed an in-situ thermal,electrical and acoustic multi-parameter probe of marine sediments suitable for deep-sea submersible.The probe used the time difference method to measure the sound velocity and sound attenuation coefficient in the sediment,the Wenner method to measure the conductivity parameters of the sediment,and the NTC thermistor as a temperature sensor to measure the temperature of the sediment.Sandy sediments were measured after probe calibration.The experimental results show that the acoustic velocity of the sediment samples is 1737.5 m/s and the acoustic attenuation coefficient is 2.5 dB/m.The standard error of the probe is less than 2.8%.The temperature measurement error is less than 0.28℃,and the temperature measurement time is not less than 120 s.The experimental results show that the probe can accurately and quickly measure the thermal,electrical and acoustic parameters of marine sediments.