Seabed bottom type measurement apparatus bottoming process combined determination method and device

Abstract

The invention provides a seabed bottom type measurement apparatus bottoming process combined determination method and device. The method includes that an underwater magnetic trigger switch and an acoustic velocity measuring device are arranged on a bottom type measurement apparatus, whether the device is at the bottom is determined by the relative position change of the magnetic part and the switch element of the magnetic trigger switch; based on the big difference of acoustic velocity in the air and water, whether the device is in the air or water is determined by the acoustic velocity measuring device; and by means of the two outputs (bottoming and non-bottoming signals) of the magnetic trigger switch and the two outputs of the sound velocity measuring device (air velocity and water velocity), the four states, namely, the deck parking state, the deck hoisting state, the underwater hoisting state, and the seabed bottoming state, of the device from the research vessel deck to the seabed are distinguished. The method is simple in principle, high in operationality, and easy to realize, fully utilizes the technologies in the prior art, e.g. the magnetic trigger switch, a minisize CTD or a minisize SVP (for acoustic velocity measurement) etc., and greatly improves the reliability and prevents misoperation.

Description

technical field

[0001] The invention belongs to the general technical field of marine surveying, and in particular relates to a combined discrimination method for the bottoming process of a bottom-sealing measuring device. Background technique

[0002] In-situ measurement of seabed is an important trend in the development of oceanographic measurement technology. Many in-situ measurement devices use the bottoming method for automatic underwater measurement, and it is necessary to control the start of the underwater measurement operation by judging the bottoming process of the equipment. At present, various types of underwater trigger switches developed in China can be used for bottoming judgment, such as patent 201420466785.7 (a deep-water non-contact trigger switch), 201420182678.1 (a hydraulic outrigger bottoming sensor), underwater magnetic proximity switch), 200510061926.2 (a deep-sea magnetic trigger switch), etc. When the in-situ measuring instrument sits on the botto...

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