Acoustic profile measuring device and method for seafloor sediment

Abstract

The invention provides an acoustic profile measuring device and method for seafloor sediment. The acoustic profile measuring device comprises a core tube, a transducer clamping mechanism, a lifting mechanism, the fixed connection and attitude adjustment between the core tube and a lifting guide rail are carried out by a core tube locating device, the fixed connection and attitude adjustment between the transducer clamping mechanism and the lifting guide rail are carried out by a transducer locating mechanism, the transducer locating device is connected with the lifting guide rail through a lifting guide sleeve, the transducer locating device can go up and down along the guide rail, a lifting handwheel is arranged on the upper end of a lifting screw to realize the lifting of the transducerclamping mechanism by shaking the lifting handwheel. The transducer group is mounted on the lifting guide rail by a clamping mechanism, the transducer group can be driven up and down by rotating lifting handwheel which can be used to measure the arbitrary cross-section of the core tube, and the core pipe is placed vertically, and the sediment fills the sample tube, which avoids the flowing of flowing plastic, soft plastic or water-saturated seabed surface sediment, and greatly improves the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of medium acoustic characteristic measurement, in particular to a device for measuring acoustic profiles of seabed sediments. Background technique [0002] Acoustic parameters of seafloor sediments, such as the velocity and attenuation of sound waves propagating in sediments, are fundamental input parameters for the theory of acoustic wave propagation in sediments and are also required for theory-based acoustic models. Obtaining the sound velocity and sound attenuation profiles of seabed sediments is of great significance to the model calculation of the acoustic field of the marine environment and the forward and inversion of geophysics. [0003] There are three main types of measurement techniques for acoustic parameters of seabed sediments, namely, reflection / refraction profile telemetry, in-situ measurement, and sampling laboratory measurement. Reflection / refraction profiling telemetry technology provide...

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Problems solved by technology

[0005] In the actual experiment, this method has certain defects, mainly in that a section of the sample needs to be cut off during the measurement process, which will inevitably cause disturbance to the sediment, especially for fluid plastic and soft plastic sediments, the performance is more obvious

In addition, the sound attenuation obtained by it is only the average value in the length direction of the truncated sample, and it is impossible to obtain a continuous sound velocity and sound attenuation profile of seabed sediments

[0006] Although the core comprehensive test system (MSCL) produced by British GEOTEK company can obtain the acoustic profile of the columnar seabed sediment sample, the columnar sample needs to be measured horizontally during the test. For fluid plastic, soft plastic or water-saturated seabed surface sediment In other words, the sediment will flow, and from the cross-section of the sample tube, the sediment cannot fill the sample tube, which affects the test accuracy; in addition, the acoustic transducer of the core comprehensive testing system is not well coupled with the sample tube

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