Photoelectric Detection Technology in Underwater Vehicles

2020 ◽  
pp. 1-8
Author(s):  
Zhen Ren
Keyword(s):  
Underwater Vehicles ◽  
Photoelectric Detection ◽  
Detection Technology

Numerical Study on Multiple-Blade-Rate Unsteady Propeller Forces for Underwater Vehicles

2021 ◽  
pp. 1-20
Author(s):  
Kenshiro Takahashi ◽  
Jun Arai ◽  
Takayuki Mori
Keyword(s):  
Numerical Study ◽  
Underwater Vehicles ◽  
Marine Propellers ◽  
Defense Systems ◽  
Detection Technology ◽  
Acoustic Signature ◽  
Océanographic Survey ◽  
Propeller Blades ◽  
Marine Vessels ◽  
Blade Loads

The unsteady propeller forces of an underwater vehicle were numerically simulated using computational fluid dynamics to investigate the effects of the axial location of the stern planes. A benchmark study was undertaken using a three-bladed propeller; experimental results of the nominal inflow wake profile were analyzed and the unsteady propeller forces were measured. The numerical method was applied to predict the unsteady propeller forces in the SUBOFF model’s wake by varying the axial locations of the stern planes. Several remarks were made on the primary harmonics of the hull’s wakes and blade-rate propeller forces. Introduction The hydroacoustic noise, which matches multiples of the number of propeller blades and its rotational speed, known as “blade-rate (BR) noise,” has been increasingly used to manage hydroacoustics for naval vessels. BR noise can be caused by alternating blade loads owing to fluctuations in the angle of attack of the blades because marine propellers are operated in the nonuniform wake of ships’ hulls. The unsteady blade load produces unsteady propeller forces that are transmitted via the propeller shaft and bearing, thus producing undesirable vibration and noise. Although the resultant BR noise is a common issue for marine vessels, in particular, submarines and other underwater vehicles deployed for undersea defense systems and oceanographic survey systems require strict specifications for the acoustic signature. Therefore, the unsteady propeller forces must be improved for reduced detectability, because the vehicles should be able to operate without being discovered while sonar detection technology continues to improve.

scholarly journals Photoelectric detection technology of laser seeker signals

2019 ◽  
Vol 30 (6) ◽  
pp. 1064-1073 ◽  
Author(s):  
Likun ZHU ◽  
Fangxiu JIA ◽  
Xiaodong JIANG ◽  
Xinglong LI
Keyword(s):  
Photoelectric Detection ◽  
Detection Technology

scholarly journals Application of Vacuum Photoelectric Detection Technology in Super-Resolution System

2020 ◽  
Vol 10 (06) ◽  
pp. 141-148
Author(s):  
Kai Gu ◽  
Xuefeng Liu ◽  
Yang Zhang ◽  
Hanwen Zhao ◽  
Weiping Liu
Keyword(s):  
Super Resolution ◽  
Photoelectric Detection ◽  
Detection Technology ◽  
Resolution System

Design of Illumination Intensity Measure Instrument

2014 ◽  
Vol 513-517 ◽  
pp. 3522-3525
Author(s):  
Wei Song ◽  
Zhi Yong Meng ◽  
Shu Wang Chen
Keyword(s):  
New Technology ◽  
Incident Light ◽  
Electrical Energy ◽  
Illumination Intensity ◽  
Intensity Measure ◽  
Geometric Quantity ◽  
Optical Cable ◽  
Photoelectric Detection ◽  
Detection Technology ◽  
The Moment

Photoelectric detection technology is a kind of new technology of non-contact measurement in terms of the modern photoelectric devices such as laser, infrared ray and optical cable. Through the detecting on the radiation with the information of the detecting objects and extracting the useful information by the input circuits, inputting LED from the A/D interface, and then the parameters such as geometric quantity or physical quantity are displayed. The design of illumination intensity measure instrument is based on photoelectric detection technology. It receives the incident light through the photodiode and converts the light energy into electrical energy. Have been filtered and amplified, the current is converted into digital value by the ICL7106 A/D converter, and the accurate data is displayed on the LED digital tube. So the data is the value of Illumination intensity at the moment.

Research of Quantitative Analyzer for Fluorescence Immune Chromatography Strips

2013 ◽  
Vol 373-375 ◽  
pp. 1000-1006
Author(s):  
Xiao Ting Li ◽  
Kai Jiang ◽  
Ping Wang
Keyword(s):  
Least Square Method ◽  
High Accuracy ◽  
Least Square ◽  
Good Prospect ◽  
Fluorescence Immunoassay ◽  
Response Characteristics ◽  
Photoelectric Detection ◽  
Detection Technology ◽  
Relative Standard ◽  
Low Pass

Fluorescence immunoassay technology is widely recognized as the most sensitive detection technology, now widely used in clinical testing. The research of quantitative analyzer for fluorescence immune chromatography strips is of great significance. In this thesis, a quantitative analyzer for fluorescence immune chromatography strips has realized, based on photoelectric detection principle and immunochromatographic. The system uses LPC1788 and MSP430 as processors. Using some algorithms such as low-pass filtering, least square method and area method to analyze the detected waveform and eliminate noise with high accuracy. In our experiment, the minimum detection concentration is at several mIU/ml levels, the relative standard deviation is less than 2% and it has good linear response characteristics in a concentration range from 0.5125 to 952mIU/ml while the correlation coefficient R2 is 0.981. The instrument has a good prospect.

Precision Temperature Sensor Design

2013 ◽  
Vol 823 ◽  
pp. 161-164
Author(s):  
Yong Juan Meng ◽  
Hong An Guo
Keyword(s):  
Mathematical Model ◽  
Temperature Sensor ◽  
Temperature Compensation ◽  
Photovoltaic Cells ◽  
High Accuracy ◽  
Photoelectric Detection ◽  
Detection Technology ◽  
Precision Temperature ◽  
Temperature Signal ◽  
And Control

In the photoelectric detection technology,Often encountered in the detection and control of temperature.If the use of photovoltaic cells,Photoresistor,When the photodiode as a measurement of original,Because temperature of the light current or sensitive resistor, Therefore, if the requirements of high accuracy,Need to build circuit for temperature compensation on many occasions,For temperature control,Or independent testing to the temperature signal into the microcontroller,Through the system mathematical model associated with the temperature and temperature compensation of software,The last one is common ways.

The study of photoelectric detection technology for underwater projects

2007 ◽  
Author(s):  
Gang Lu ◽  
Xiaohui Zhang ◽  
Donghua Zhu ◽  
Jionghui Rao
Keyword(s):  
Photoelectric Detection ◽  
Detection Technology
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