Calibration technology of length measurement accuracy of total station in automatic air refractive index compensation system

2019 ◽  
Author(s):  
ping Li ◽  
Mingzhao HE ◽  
Jianshuang LI ◽  
Fumin ZHANG
Keyword(s):  
Refractive Index ◽  
Measurement Accuracy ◽  
Compensation System ◽  
Length Measurement ◽  
Total Station

Optic Method to Measure the Density of Gas and the Analysis on Uncertainty of Measurement

2011 ◽  
Vol 361-363 ◽  
pp. 226-231
Author(s):  
Chang Li Guo ◽  
Yan Qing Zhang
Keyword(s):  
Refractive Index ◽  
Measurement Accuracy ◽  
Uncertainty Of Measurement ◽  
Interference Theory ◽  
Interference Fringes ◽  
Air Chamber ◽  
High Measurement ◽  
Wedge Structure ◽  
High Measurement Accuracy ◽  
Optical Wedge

A optic method to measure the density of gas is put forward. That is, by using the optical Wedge structure to build air chamber and chamber for gas under test, and by measuring the differences of the optical Wedge interference fringes of the two rooms, the density of gas has been measured. The interference theory of Wedge has been theoretical analyzed, and a formula which can be used to measure the refractive index of gas is put forward, and the uncertainty of the measurement has been analyzed. The parameters of gas density, refractive index and gas thickness have been used in the formula. The results show that the method of optical Wedge interference is practical, and high measurement accuracy is achievement when the density of gas is high.

Influence of refractive index measurement accuracy on single-mode optical fiber modeling

1992 ◽  
Vol 4 (11) ◽  
pp. 1282-1284 ◽  
Author(s):  
E. Jaunart ◽  
P. Megret ◽  
J.C. Froidure ◽  
P. Crahay ◽  
M. Blondel ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Measurement Accuracy ◽  
Single Mode ◽  
Refractive Index Measurement ◽  
Single Mode Optical Fiber ◽  
Index Measurement

scholarly journals A Sensing Peak Identification Method for Fiber Extrinsic Fabry–Perot Interferometric Refractive Index Sensing

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 96 ◽  
Author(s):  
Bowen Yang ◽  
Biyao Yang ◽  
Ji Zhang ◽  
Yiheng Yin ◽  
Yanxiong Niu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Measurement Accuracy ◽  
Measurement Range ◽  
Superior Performance ◽  
Refractive Index Sensing ◽  
Identification Method ◽  
Peak Identification ◽  
Fabry Perot ◽  
High Measurement ◽  
Lateral Offset

A novel sensing peak identification method for high accuracy refractive index (RI) sensing is proposed. The implementation takes the intensity of interference maximum as the characteristic to distinguish interference peaks, tracking the sensing peak continually during a RI changes, with high measurement accuracy and simple computation. To verify the effect of the method, the extrinsic Fabry–Perot interferometer (EFPI) sensor has been fabricated using the large lateral offset splicing technique. In the RI range from 1.346 to 1.388, the measurement range of the EFPI with the proposed method reaches at least 6 times larger than that of EFPI with the wavelength tracking method and the largest measurement error is −4.47 × 10−4. The EFPI refractive index (RI) sensor identified the sensing peak is believed to play an important role in RI, concentration and density sensing, etc., for superior performance.

The Effect of Variations in the Refractive Index of Industrial Air upon the Uncertainty of Precision Length Measurement

Metrologia ◽  
1993 ◽  
Vol 30 (1) ◽  
pp. 7-14 ◽  
Author(s):  
K P Birch ◽  
F Reinboth ◽  
R E Ward ◽  
G Wilkening
Keyword(s):  
Refractive Index ◽  
Length Measurement

scholarly journals A Real-Time Measurement Method of Air Refractive Index Based on Special Material Etalon

2018 ◽  
Vol 8 (11) ◽  
pp. 2325 ◽  
Author(s):  
Guo-Ying Ren ◽  
Xing-Hua Qu ◽  
Shuang Ding
Keyword(s):  
Refractive Index ◽  
Real Time ◽  
Direct Measurement ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Laser Interferometry ◽  
Measurement Technology ◽  
Measurement Principle ◽  
Environmental Responses ◽  
Realization Process

In the precise displacement measurement based on laser interferometry, the measurement technology for the refractive index of air is widely used to improve the measurement accuracy. However, the existing measurement method of the refractive index of air based on direct measurement is not easy to realize in practical work because of its complex measurement principle and the huge volume of the measurement device; while the measurement accuracy and speed based on the indirect method cannot adapt to the real-time, fast and accurate measurement requirements of industrially changing environments, resulting in distortion of the results. In this study, a measurement method of the refractive index of air based on a special material etalon is proposed. The method enables rapid and direct measurement of the air refractive index when the environment changes and it is given the realization process. Finally, the experimental results show that the deviation between this method and the modified Edlen formula is about 2.5 × 10−7, and that this method can quickly reflect the changes of the environment, which prove the correctness of this method and its ability manage rapid environmental responses. This method is worth popularizing in industrial measurement.

Design of Refractive Index Test Equipment of High Refractive Index Glass Beads by Secondary Rainbow Method

2011 ◽  
Vol 66-68 ◽  
pp. 1320-1324 ◽  
Author(s):  
Dong Hua Guo ◽  
Jun Ma ◽  
Xue Feng Ma ◽  
Lei Peng
Keyword(s):  
Refractive Index ◽  
Measurement Accuracy ◽  
Optical Design ◽  
High Refractive Index ◽  
Glass Beads ◽  
Test Method ◽  
Test Equipment ◽  
Index Test ◽  
Statistical Measurement ◽  
Cause Of Error

This paper explains the theory of the secondary rainbow and provides a test method of refractive index of the high refractive index glass beads. We carry out the optical design relate to the method, and design a refractive index test equipment. Additionally, we analyze the calibration requirements of the equipment and discuss the cause of error and measurement accuracy. The designed equipment can achieve a continuous, accurate, statistical measurement.

Vertical refraction determination using a Trimble S9 total station

2020 ◽  
Vol 954 (12) ◽  
pp. 2-9
Author(s):  
D.V. Dementiev ◽  
I.M. Zhukov ◽  
M.Y. Karavanov ◽  
I.I. Ranov ◽  
N.Yu. Litvinov
Keyword(s):  
Atmospheric Turbulence ◽  
Turbulent Atmosphere ◽  
Measurement Accuracy ◽  
Dynamic Method ◽  
Experimental Studies ◽  
High Accuracy ◽  
Measuring Instruments ◽  
Total Station ◽  
The Real

Classical methods for determining refraction are based on Newton’s formulae for a statically stable atmosphere. However, they do not provide the required measurement accuracy due to random changes in refraction, caused by the influence of atmospheric turbulence. The aim of this work is to study the dynamic method for determining refraction in a turbulent atmosphere. The measurements were performed with a Trimble S9 total station. It was found out, that within a few seconds the angle of vertical refraction can change by dozens of arc seconds. To improve the accuracy of the results, it is necessary to determine the refraction instantly for a specific moment of observation and for a particular path, otherwise the obtained corrections will not correspond to the real angle of refraction. The introduction of a dynamic method for determining refraction requires more extensive experimental studies under various observation conditions. In the case of confirmation of the high accuracy of the dynamic method for determining the fraction, significant prospects open up for taking refraction into account and developing new more effective measuring instruments in a turbulent atmosphere.

Research on the Compensation Method of Installation Errors in Guideway Straightness Measurement with PSD

2012 ◽  
Vol 630 ◽  
pp. 389-395
Author(s):  
Rui Fan ◽  
Di Zhang
Keyword(s):  
Significant Influence ◽  
Error Compensation ◽  
Measurement Accuracy ◽  
Compensation System ◽  
Compensation Method ◽  
Error Angle ◽  
Compensation Theory ◽  
Straightness Error ◽  
After Error

Influence and Compensation Theory of Installation Errors in Guideway Straightness Measurement with PSD Is Analyzed. it Shows that Pincushion Distortion Affects PSD’s Accuracy, while Angle θ between Laser and Guideway, Error Angle Caused by Straightness Error and Angle β Generated when PSD Rotates about the Guideway Have Significant Influence on System Measurement Accuracy. PSD’s Pincushion Distortion Could Be Corrected and Installation State Can Be Determined by Measuring on Site and Calibrating with Laser Tracer. after Error Compensation, System Measurement Accuracy Is Greatly Improved.

scholarly journals Two-Wavelength Laser Interferometer System Which Reduces the Uncertainty Caused by the Fluctuation of the Refractive Index of Air

2011 ◽  
Vol 5 (2) ◽  
pp. 126-131 ◽  
Author(s):  
Kaoru Miyata ◽  
◽  
Hidekazu Oozeki ◽  
Hideyuki Nakagawa ◽  
Hiroki Masuda ◽  
...  
Keyword(s):  
Refractive Index ◽  
Uncertainty Analysis ◽  
Measurement Accuracy ◽  
Laser Interferometer ◽  
Optical Path ◽  
Highly Sensitive ◽  
Industrial Use ◽  
Laser Interferometers ◽  
532 Nm

Laser interferometers are widely used to measure highly sensitive length and displacement, e.g., in which refractive index fluctuations of air adversely affect measurement accuracy. To compensate for these effects, the two-wavelength interferometer studied has not yet proved practical in industrial use. We studied the interferometer’s performance and practicality, using uncertainty analysis to extract its features. Based on our results, we developed a two-wavelengthMichelson interferometer with wavelengths of 1064 nm and 532 nm. It was calibrated and evaluated using a highprecision laser interferometer whose optical path was in a vacuum. Results confirmed measurement accuracy of 100 nm/50 mm (k=2) under unstable air conditions - superior to a traditional laser interferometer.

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