A deep-sea, high-speed, stereoscopic imaging system for in situ measurement of natural seep bubble and droplet characteristics

2015 ◽  
Vol 104 ◽  
pp. 134-148 ◽  
Author(s):  
Binbin Wang ◽  
Scott A. Socolofsky
Keyword(s):  
Deep Sea ◽  
High Speed ◽  
Imaging System ◽  
In Situ Measurement ◽  
Stereoscopic Imaging

In Situ Measurement of Sloshing Impact on LNG Insulation Panel by using High Speed Fiber Optics

2010 ◽  
Vol 21 (8) ◽  
pp. 787-796 ◽  
Author(s):  
Min-Cheol Oh ◽  
Jun-Kyu Seo ◽  
Kyung-Jo Kim ◽  
Sang-Min Lee ◽  
Myung-Hyun Kim
Keyword(s):  
Fiber Optics ◽  
High Speed ◽  
In Situ Measurement

scholarly journals In Situ Measurement of Seeking Speed and Seeking Induced Head-Disk Interface Instability in Hard Disk Drives

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Yu Wang ◽  
Xiongfei Wei ◽  
Yanyang Zi ◽  
Kwok-Leung Tsui
Keyword(s):  
High Speed ◽  
Hard Disk Drives ◽  
Laser Doppler Vibrometer ◽  
Voice Coil Motor ◽  
In Situ Measurement ◽  
Head Disk Interface ◽  
Magnetic Head ◽  
Interface Instability ◽  
Disk Interface

This paper investigated the instability of head-disk interface caused by the voice coil motor (VCM) end crashing the crash stop during the seeking of magnetic head. To make the whole process of that clear, an in situ measurement method based on maximum likelihood estimation and extended Kalman filter for seeking speed at component level was developed first and was then calibrated by a high speed camera. Given a crash between VCM end and crash stop that may be a consequence of the continuous increasing seeking speed, the seeking speed was carefully controlled by using our developed method to find a critical value that may induce vigorous head-disk interface instability. Acoustic emission sensor and laser Doppler vibrometer were used to capture the transient dynamic behaviors of magnetic head when the crash is happening. Damage analysis and mode identification were carried out to reveal the relationship between the damage patterns on disk surface and head dynamics. The results of this study are helpful to optimize the track seeking profile during the HDD operation, as well as the design of components such as head and head arm.

scholarly journals Development and application of a temperature gradient detector for manned underwater robot

2020 ◽  
Vol 17 (4) ◽  
pp. 172988142091696
Author(s):  
Dewei Li ◽  
Ye Li ◽  
Zhongjun Ding ◽  
Xiangxin Wang ◽  
Baohua Liu
Keyword(s):  
Temperature Gradient ◽  
Deep Sea ◽  
Stability Limit ◽  
In Situ Measurement ◽  
Transient Temperature ◽  
Underwater Robot ◽  
Scientific Application ◽  
Deep Sea Sediment ◽  
Operation Conditions

Manned underwater robot is an important platform to carry various sensors and working tools to finish the in situ measurement and sampling in the deep sea. Due to its limited loading capacity, the device it will be carried, usually, requires to be able to dive to its working depth with a small volume and weight. According to the application requirements of deep-sea sediment temperature gradient in situ measurement observed, a detector system that can obtain data in situ is designed, which mainly includes a titanium alloy electronic cabin and a temperature probe. A comprehensive design analysis method is used to compare and analyze the ultimate static pressure, stability limit load, bending moment load, and transient temperature field on the underwater operation conditions. Optimal dimensions and filled media in the probe are decided. Finally, the pressure resistance test is finished in the lab, and scientific application is conducted on Jiaolong’s 127th dive in the Northwest Indian Ocean, which successfully sampling the temperature gradient data of deep-sea sediments in the Daxi hydrothermal area. The method introduced in this article can effectively improve the safety and reliability of deep-sea structure and greatly reduce costs throughout the design cycle.

An In Situ Measurement Method for Detecting Dissolved Deep-Sea Sulfur Ion Concentration

2018 ◽  
Vol 45 (9) ◽  
pp. 0911011
Author(s):  
刘宁武 Liu Ningwu ◽  
王洪亮 Wang Hongliang ◽  
何天博 He Tianbo ◽  
赵月霞 Zhao Yuexia ◽  
丁忠军 Ding Zhongjun ◽  
...  
Keyword(s):  
Deep Sea ◽  
Measurement Method ◽  
In Situ Measurement ◽  
Ion Concentration

Development of a deep-sea multi-mode acoustic sediments in situ measurement system

2016 ◽  
Author(s):  
Jiuyi Yuan ◽  
Haibin Yu ◽  
Haiyu Yan ◽  
Li Xu ◽  
Guanbao Li
Keyword(s):  
Measurement System ◽  
Deep Sea ◽  
In Situ Measurement ◽  
Multi Mode

Development of Tool Based Micromilling/Microdrilling Machine with Piezoactuated Workpiece Feeding System

2014 ◽  
Vol 592-594 ◽  
pp. 164-169 ◽  
Author(s):  
R. K. Veeresha ◽  
Muralidhara ◽  
Rathnamala Rao
Keyword(s):  
Measurement System ◽  
High Speed ◽  
Cooling System ◽  
Detection System ◽  
Device Fabrication ◽  
In Situ Measurement ◽  
Feeding System ◽  
Drilling Tool ◽  
Mechanical Micromachining

Tool based mechanical micromachining technology is gaining importance in MEMS device fabrication because of its ability to machine 3D micro features on different engineering materials. This paper presents the development of tool based mechanical micromachining center with piezoactuated workpiece feeding system. A high speed spindle is used to rotate the micromilling/drilling tool at a speed of 12,000 to 60,000 rpm. A thermoelectric based liquid cooling system is developed to control the temperature of the high speed spindle at a set value. Along with the X-Y positioning system, the workpiece is also mounted on a piezoactuator to provide Z-axis motion during machining operation. An electrical continuity based tool-workpiece contact detection system is developed to overcome premature tool failure during initial tool registration with the workpiece. Based on the developed tool-workpiece contact sensor, an in-situ measurement system is developed to measure the micromachining depth. Experiments were conducted to measure the performance of spindle cooling system and in-situ measurement system.

scholarly journals Observations of in situ deep-sea marine bioluminescence with a high-speed, high-resolution sCMOS camera

2016 ◽  
Vol 111 ◽  
pp. 102-109 ◽  
Author(s):  
Brennan T. Phillips ◽  
David F. Gruber ◽  
Ganesh Vasan ◽  
Christopher N. Roman ◽  
Vincent A. Pieribone ◽  
...  
Keyword(s):  
High Resolution ◽  
Deep Sea ◽  
High Speed
Sign in / Sign up

Export Citation Format

Share Document