scholarly journals Application of Spectrum-Subtracted Sub-band Singular Spectrum Entropy in Sediment Thickness Measurement

2014 ◽  
Vol 8 (1) ◽  
pp. 278-285
Author(s):  
Di Fan ◽  
Di Fan ◽  
Di Fan
Keyword(s):  
Noise Immunity ◽  
Thickness Measurement ◽  
High Accuracy ◽  
Time Difference ◽  
Hard Problem ◽  
Sediment Thickness ◽  
Singular Spectrum ◽  
Head Positions

Obtaining the wave head location and acoustic time difference with high accuracy in measuring sediment thickness in borehole by ultrasonic is a key and hard problem. The methods available now can’t meet the precision and noise immunity requirement. This paper utilizes the good performance of Spectrum-Subtracted sub-Band Singular Spectrum Entropy (SSB-SSE) to process the echoes reflected from the sediment and get their wave head positions. Based on these obtained data, acoustic time difference can be calculated, then the sediment thickness can be achieved. The results of three typical experiments show that SSB-SSE is very suitable in locating the wave heads of thicker sediment layer’s echoes, and it also performs well even when the echo is covered by noise.

Design and Implementation of a High Accuracy Interpolation Encoder IC for Magnetic Sensor

2019 ◽  
Author(s):  
Wen-Yu Chen ◽  
Yi-Feng Zhang ◽  
Paul C.-P. Chao ◽  
Eka Fitrah Pribadi
Keyword(s):  
Measurement System ◽  
Noise Immunity ◽  
Supply Voltage ◽  
High Accuracy ◽  
Cmos Process ◽  
Specific Method ◽  
Clock Frequency ◽  
Design And Implementation ◽  
Equal Distance ◽  
Interpolation Technique

Abstract The magnetic encoder (ME) always employs sensor passing through periodic and equal distance grating and then generates periodic quadrature scaling signals for displacement measurement. The phase is relative to the movement. To improve encoder accuracy or resolution, electronic interpolation technique had been developed to subdivide the phase of quadrature scaling signals. According to the trends, this paper proposed a specific method with excellent noise immunity characteristic and a complete calibration process to improve the accuracy of the system. The designed circuit is taped-out using TSMC 0.18-μm CMOS process, where the active area is 1643 μm × 1676 μm. The chip has the specification of 3.3 V supply voltage, 20 MHz clock frequency, and 0.0859 mW power consumption. The accuracy of the measurement system is 1.065um.

Aerosol Optical Thickness Measurement with Elevation-Scanning Lidar

2015 ◽  
Vol 32 (7) ◽  
pp. 1364-1371
Author(s):  
Pavel I. Ionov ◽  
Andrew K. Mollner
Keyword(s):  
Optical Thickness ◽  
Thickness Measurement ◽  
High Accuracy ◽  
Sufficient Accuracy ◽  
Aerosol Optical Thickness ◽  
Calibration Standards ◽  
Accuracy Measurement ◽  
Scanning Lidar ◽  
Sun Photometer ◽  
High Accuracy Measurement

AbstractHigh-accuracy measurement of aerosol optical thickness (AOT) τa with an elevation-scanning lidar is demonstrated and the results are compared with a collocated Cimel 318 sun photometer. Linear regression of the time-coincident data from a 2-week measurement campaign with the two instruments is found to be τalidar = (1.00 ± 0.17)τaphot + (0.025 ± 0.019) (1σ). The method proved to have sufficient accuracy to measure AOTs of 0.1–0.2 commonly seen in relatively clear atmosphere. The measurement is absolute and thus does not depend on any external calibration standards.

scholarly journals Comprehensive Temperature Control of a Hot Metal Rolling Thickness Measurement System

2020 ◽  
Vol 15 ◽  
Keyword(s):  
High Precision ◽  
Temperature Control ◽  
Measurement System ◽  
Thermal Stabilization ◽  
Thickness Measurement ◽  
High Accuracy ◽  
Hot Metal ◽  
Metallurgical Production ◽  
Precision System ◽  
Thickness Measurement System

The work is devoted to the development of integrated thermostating subsystem of a high-precision system for measuring the thickness of hot metal rolling. The developed thermostatting subsystem includes active and passive modules, which ensured thermostability of the measuring modules at the level of 0.5 degrees in a hot metallurgical workshop. Thermal stabilization made it possible to ensure high accuracy in measuring the thickness of hot metal rolling in a hot metallurgical production workshop.

scholarly journals Optimization of Direct Direction Finding Method with Two-Dimensional Correlative Processing of Spatial Signal

2018 ◽  
Vol 8 ◽  
pp. 46-53
Author(s):  
Vitaliy V. Tsyporenko ◽  
Valentyn G. Tsyporenko
Keyword(s):  
Main Parameter ◽  
Noise Immunity ◽  
Signal To Noise Ratio ◽  
Direction Finding ◽  
High Accuracy ◽  
Signal To Noise ◽  
High Noise ◽  
Spatial Shift ◽  
Simulation Results ◽  
Finding Method

In this article, the main parameter of the correlative-interferometric direction finding method with twodimensional correlative processing of spatial signal in the aperture of a linear antenna array (AA) is determined as the value of spatial shift within the AA aperture. The corresponding objective function is also formed. Analytical optimization of this parameter is presented and a comparative analysis of analytical calculations based on simulation results is conducted. In the simulation, a range of dependencies of the middle square deviation of estimation of direction on the value of the spatial shift for a signal-to-noise ratio of 0 dB, for minimum 3-sample and 4-sample Blackman-Harris windows of the spectral analysis, is received. The value of the middle square deviation of estimation of direction will be minimal and will equal 0.02 degrees using a minimum 3-sample Blackman-Harris window with the −67 dB level of side lobes. It offers high noise immunity and high accuracy of direction finding.

High-accuracy spectral interferometer with multi-Fabry–Perot Etalon for thickness measurement of the silicon wafer

2021 ◽  
pp. 127346
Author(s):  
Meiyun Chen ◽  
Shuiling Pang ◽  
Jinglun Zhou ◽  
Heng Wu ◽  
Matsumoto Hirokazu ◽  
...  
Keyword(s):  
Silicon Wafer ◽  
Thickness Measurement ◽  
High Accuracy ◽  
Fabry Perot

Design of Ultrasonic Processing Circuits in Borehole Sediment Thickness Measurement

2013 ◽  
Vol 416-417 ◽  
pp. 549-553
Author(s):  
Di Fan ◽  
Yan Gao ◽  
Qin Guang Cai
Keyword(s):  
Automatic Gain Control ◽  
Gain Control ◽  
Thickness Measurement ◽  
Control Circuit ◽  
Ultrasonic Processing ◽  
Sediment Thickness ◽  
Flip Flop ◽  
Filter Bandwidth ◽  
The Given ◽  
Driving Circuit

The ultrasonic technique is a new method for detecting the borehole sediment thickness and has been gradually developed in recent years. However, there are still several key technologies needing to be further studied and developed. This paper focuses on studying and designing the ultrasonic processing circuits including the mono-stable flip-flop circuit, the driving circuit, the amplification filtering circuit and the automatic gain control circuit. Under the environment of Multisim10.0, the designed circuits are simulated. The results show that the deigned ultrasonic driving circuit has a strong driving capacity and is capable of completely meeting the bandwidth requirements in measuring the sediment thickness by ultrasonic. The automatic gain control circuit is capable of strengthening the ultrasonic signal in a time varying mode so that the output signal can be kept stable within the given range. So it has a significant effect on the ultrasonic measurement of sediment; the designed amplification, filter bandwidth and the quality value can all meet the system requirements. Meanwhile, the integrated filter is adopted and few peripheral components are used, therefore, the system design is greatly simplified.

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