High-accuracy thickness measurement of a transparent plate with the heterodyne central fringe identification technique

2011 ◽  
Vol 50 (21) ◽  
pp. 4011 ◽  
Author(s):  
Wang-Tsung Wu ◽  
Hung-Chih Hsieh ◽  
Wei-Yao Chang ◽  
Yen-Liang Chen ◽  
Der-Chin Su
Keyword(s):  
Thickness Measurement ◽  
High Accuracy ◽  
Transparent Plate ◽  
Identification Technique

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.

Non-contact method of thickness measurement for a transparent plate using a laser auto-focus scanning probe

2019 ◽  
Vol 58 (35) ◽  
pp. 9524
Author(s):  
Quangsang Vo ◽  
Yiting Duan ◽  
Xiaodong Zhang ◽  
Fengzhou Fang
Keyword(s):  
Thickness Measurement ◽  
Scanning Probe ◽  
Contact Method ◽  
Transparent Plate ◽  
Auto Focus

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

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.

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