An Ice Thickness Measurement Method based on Up-looking Sonar

Author(s):  
Tongxin Liang ◽  
Danzhu Yu ◽  
Jianhua Lu
2021 ◽  
pp. 1-17
Author(s):  
Satya Prakash ◽  
Milap Chand Sharma ◽  
S. Sreekesh ◽  
Pritam Chand ◽  
Vijendra Kumar Pandey ◽  
...  

Author(s):  
Fenghui Lian ◽  
Qingchang Tan ◽  
Siyuan Liu

A method for measuring block thicknesses is proposed by the machine vision measurement. Equations of the measuring base plane and the light plane are formed by calibration. Then, the equation of the light strip image, that is, the image of the intersection between the base plane and light one, is established by the projection relation. Equation of the image of the light strip on the measured plane can be determined by the fitting. Since the light strip on the measuring base plane is parallel to one on the measured plane, the thickness of the measuring block is measured by using the two equations. The experiment evaluates the measurement accuracy of the measurement method and analyzes the influence of some factors on the measurement results.


Polar Record ◽  
2003 ◽  
Vol 39 (1) ◽  
pp. 61-78
Author(s):  
David J. Drewry

This is the third in a series of biographies entitled ‘Children of the Golden Age,’ the purpose of which is to describe the background and contributions of significant living figures in polar research who began their scientific careers following World War II. Born on 17 January 1921 in Melbourne, Gordon de Quetteville Robin was educated at Wesley College and the University of Melbourne, graduating in physics with an MSc in 1942. Following submarine training in Scotland, he served in HMS Stygian in the Pacific. Soon after commencing as a research student in nuclear physics at Birmingham University, he joined the Falkland Islands Dependencies Survey and was the first base commander at Signy Station in the South Orkney Islands (1947–48). In 1949–52 he was third-in-command on the Norwegian–British–Swedish Antarctic Expedition responsible for the successful oversnow seismic ice thickness campaign. In 1958, following a brief sojourn in Canberra, he was appointed the first full-time director of the Scott Polar Research Institute in Cambridge. During the next 24 years he developed SPRI into a world-class research institute. In the austral summer 1959–60 he undertook research operating from RRS John Biscoe in the Weddell Sea into the penetration of ocean waves into pack ice. During the early 1960s he stimulated development of radio echo sounding (RES) with Dr Stan Evans, which remains the standard technique for ice-thickness measurement. He undertook experimental fieldwork in Northwest Greenland in 1964 and airborne sounding in Canada in 1966. He was responsible for organising international collaborative programmes of airborne RES in Antarctica with American air support, leading fieldwork in 1967–68, 1969–70, and 1974–75. He was elected secretary of the Scientific Committee on Antarctic Research in 1958, serving for 12 years, and was president between 1970 and 1974. In 1975 he developed with Dr Terence Armstrong a postgraduate course in Polar Studies at SPRI. He retired as director in 1982 and continues his interests in glaciology as a senior research associate at SPRI.


2016 ◽  
Vol 28 (1) ◽  
pp. 91-94 ◽  
Author(s):  
Yuya Nishida ◽  
◽  
Kenji Nagahashi ◽  
Takumi Sato ◽  
Adrian Bodenmann ◽  
...  

[abstFig src='/00280001/10.jpg' width=""300"" text='Autonomous underwater vehicle BOSS-A' ]In order to effectively investigate the distribution and amount of cobalt-rich manganese crust (CRC), an autonomous underwater vehicle BOSS-A equipped with visual and acoustic instruments were developed. BOSS-A observes the seafloor along preset waypoints at a constant speed and altitude. Detailed 3D seafloor images can be obtained from the visual instrument, which employs a sheet laser and a camera. In addition, an acoustic instrument measures the CRC thickness beneath BOSS-A. The CRC at Katayama seamount was surveyed in February. The results visually presented the state and distribution of the CRC in this site and clarified the amount of the CRC. In the future, the authors will develop a more reliable thickness measurement method.


Author(s):  
Kai Zhang ◽  
Pan Dou ◽  
Tonghai Wu ◽  
Kai Feng ◽  
Youquan Zhu

Ultrasonic method is quite promising for oil film thickness measurement in industry, while there is normally a dead zone for one ultrasonic sensor with a special center frequency when measuring the oil film thickness by the traditional reflection coefficient amplitude. In this paper, an ultrasonic measurement method for full range of oil film thickness was investigated. The theoretical relationship between the oil film thickness and the reflection coefficient phase was firstly built up and the reflection coefficient phase was found to be able to measure the oil film thickness in the dead zone. Then the reflection coefficient amplitude and phase were combined to measure the oil film thickness in the full range. A high-precision calibrated rig, which could form a series of known film thicknesses oil layers, was set up and the performance of this method was shown to work well. This method is significant for online oil film thickness monitoring in industry.


Sign in / Sign up

Export Citation Format

Share Document