Revised error calibration model of linear accelerometer on precision centrifuge

2019 ◽  
Vol 90 (8) ◽  
pp. 085002 ◽  
Author(s):  
Chuang Sun ◽  
Shun-qing Ren ◽  
Chang-hong Wang
Keyword(s):  
Calibration Model ◽  
Error Calibration ◽  
Linear Accelerometer

scholarly journals An Onsite Calibration Method for MEMS-IMU in Building Mapping Fields

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4150 ◽  
Author(s):  
Sen Li ◽  
Yunchen Niu ◽  
Chunyong Feng ◽  
Haiqiang Liu ◽  
Dan Zhang ◽  
...  
Keyword(s):  
Least Squares Method ◽  
Calibration Method ◽  
Measurement Unit ◽  
Calibration Model ◽  
Building Information Modelling ◽  
Information Modelling ◽  
Building Information ◽  
Error Calibration ◽  
Gravity Acceleration ◽  
Mems Imu

Light detection and ranging (LiDAR) is one of the popular technologies to acquire critical information for building information modelling. To allow an automatic acquirement of building information, the first and most important step of LiDAR technology is to accurately determine the important gesture information that micro electromechanical (MEMS) based inertial measurement unit (IMU) sensors can provide from the moving robot. However, during the practical building mapping, serious errors may happen due to the inappropriate installation of a MEMS-IMU. Through this study, we analyzed the different systematic errors, such as biases, scale errors, and axial installation deviation, that happened during the building mapping, based on a robot equipped with MEMS-IMU. Based on this, an error calibration model was developed. The problems of the deviation between the calibrated and horizontal planes were solved by a new sampling method. For this method, the calibrated plane was rotated twice; the gravity acceleration of the six sides of the MEMS-IMU was also calibrated by the practical values, and the whole calibration process was completed after solving developed model based on the least-squares method. Finally, the building mapping was then calibrated based on the error calibration model, and also the Gmapping algorithm. It was indicated from the experiments that the proposed model is useful for the error calibration, which can increase the prediction accuracy of yaw by 1–2° based on MEMS-IMU; the mapping results are more accurate when compared to the previous methods. The research outcomes can provide a practical basis for the construction of the building information modelling model.

Analysis of Tropospheric Correction Models in Navigation Satellite System

2014 ◽  
Vol 602-605 ◽  
pp. 2553-2560 ◽  
Author(s):  
Rui Qiong Chen ◽  
Ya Liu ◽  
Xiao Hui Li
Keyword(s):  
Satellite System ◽  
Calibration Model ◽  
Navigation Satellite ◽  
Gps Receiver ◽  
Model Function ◽  
Internal Calibration ◽  
Error Calibration ◽  
The Impact ◽  
System Time ◽  
Better Than

In order to obtain high-precision navigation satellite system time, the errors of navigation satellite system signal need to be calibrated during its transmission, among which, troposphere delay is one of the major errors of navigation satellite system precision positioning. The calibration of troposphere delay has been compared and studied on the basis of model function theory. The troposphere models described include Marini model, Hopfield model, Saastamoinen model, Black model, and the impact extent of meteorological parameters like temperature, pressure, humidity and geographic information of observation station have been analysed quantitatively, which have been systematically analysed the characteristic of troposphere delay and the accuracy of error calibration model. Moreover, by using the data collected by IGS tracking stations to validate the analysis results of models, which has shown that Black model is better than other models when it comes to the extent of meteorological influence and also superior to the troposphere delay generated by the internal calibration model in GPS receiver.

scholarly journals HPR AND OPK ANGLE ELEMENT CONVERSION METHOD BASED ON AIRBORNE LIDAR ALIGNMENT AXIS ERROR CALIBRATION

2020 ◽  
Vol XLII-3/W10 ◽  
pp. 71-75
Author(s):  
Y. X. Mu ◽  
G. Q. Zhou ◽  
X. Zhou ◽  
J. Gao ◽  
X. Y. Peng
Keyword(s):  
Calibration Method ◽  
Airborne Lidar ◽  
Calibration Model ◽  
Control Points ◽  
Angle Error ◽  
Error Angle ◽  
Coincidence Effect ◽  
Error Calibration ◽  
Foot Position ◽  
Efficiency And Reliability

Abstract. This paper mainly uses manual calibration technology to check the elements Yaw, Pitch and Roll (YPR) in the LiDAR DGPS/IMU system and obtained the error value. Combined with the error angle, the external azimuth angle elements Kappa, Omega and Phi required by photogrammetry are obtained. The paper points out that the placement angle error will have a serious impact on the LiDAR foot position. Therefore, this paper puts forward a method to check the placement angle of the steeple roof and flat straight highway, and gives the design scheme of the optimized route to reduce the number of flights. This paper focuses on the specific process of YPR calibration, and gives a mathematical calibration model based on the influence of attitude angles Yaw, Pitch and Roll on the LiDAR foot during the flight. The placement angle error is obtained after the calibration, and the error angle matrix is used to convert the elements YPR and OPK. After checking and error correction, the point cloud obtained from adjacent airlines have achieved better coincidence effect. The experimental results show that the theory and method of YPR element calibration are correct and feasible, which simplifies the conversion process of YPR and OPK. Compared with the traditional calibration method that requires control points, this method can greatly improve the efficiency and reliability of the inspection.

Determination of the International Sensitivity Index of a New Near-Patient Testing Device to Monitor Oral Anticoagulant Therapy

1997 ◽  
Vol 78 (02) ◽  
pp. 855-858 ◽  
Author(s):  
Armando Tripodi ◽  
Veena Chantarangkul ◽  
Marigrazia Clerici ◽  
Barbara Negri ◽  
Pier Mannuccio Mannucci
Keyword(s):  
Linear Relationship ◽  
Whole Blood ◽  
Oral Anticoagulant ◽  
Oral Anticoagulant Therapy ◽  
Oral Anticoagulants ◽  
Calibration Model ◽  
Testing Device ◽  
Data Points ◽  
Near Patient Testing

SummaryA key issue for the reliable use of new devices for the laboratory control of oral anticoagulant therapy with the INR is their conformity to the calibration model. In the past, their adequacy has mostly been assessed empirically without reference to the calibration model and the use of International Reference Preparations (IRP) for thromboplastin. In this study we reviewed the requirements to be fulfilled and applied them to the calibration of a new near-patient testing device (TAS, Cardiovascular Diagnostics) which uses thromboplastin-containing test cards for determination of the INR. On each of 10 working days citrat- ed whole blood and plasma samples were obtained from 2 healthy subjects and 6 patients on oral anticoagulants. PT testing on whole blood and plasma was done with the TAS and parallel testing for plasma by the manual technique with the IRP CRM 149S. Conformity to the calibration model was judged satisfactory if the following requirements were met: (i) there was a linear relationship between paired log-PTs (TAS vs CRM 149S); (ii) the regression line drawn through patients data points, passed through those of normals; (iii) the precision of the calibration expressed as the CV of the slope was <3%. A good linear relationship was observed for calibration plots for plasma and whole blood (r = 0.98). Regression lines drawn through patients data points, passed through those of normals. The CVs of the slope were in both cases 2.2% and the ISIs were 0.965 and 1.000 for whole blood and plasma. In conclusion, our study shows that near-patient testing devices can be considered reliable tools to measure INR in patients on oral anticoagulants and provides guidelines for their evaluation.

Development and Validation of HPLC/UV-Spectrophotometric Procedures for Metronidazole Quantitative Determination

2018 ◽  
Vol 9 (3) ◽  
Author(s):  
Klimenko Lina Yu ◽  
Shkarlat Galyna L ◽  
Shovkova Zoia V ◽  
Yaremenko Vitaliy D ◽  
Shpychak Oleg S
Keyword(s):  
Quantitative Determination ◽  
Sodium Hydroxide Solution ◽  
Gradient Elution ◽  
Calibration Model ◽  
Column Temperature ◽  
Medical Laboratories ◽  
Accuracy And Precision ◽  
Development And Validation ◽  
Gradient Elution Mode ◽  
Potential Object

Metronidazole is the most popular representative of antiprotozoal medicines from the group of 5-nitroimidazoles. Metronidazole blocks the enzymes of alcohol dehydrogenase and acetaldehyde dehydrogenase, therefore when its joint taking with alcohol it is observed the strong intoxication syndrome and fatal poisonings too. Therefore metronidazole can be a potential object of chemical toxicological investigations. The purpose of our paper is to develop HPLC/UV-procedure of metronidazole quantification with application of the system of HPLC-analyzer MiLiChrome® A-0230 implemented in practice of forensic medical laboratories in Russia and Ukraine and carry out step-by-step validation of the developed procedure. Chromatographic conditions: Eluent A (0.2 M LiClO4 – 0.005 M HClO4) and Eluent B (acetonitrile) wereused as the mobile phase components; HPLC microcolumn Ø2×75 mm and ProntoSIL 120-5-C18 AQ, 5 μm were used as an analytical column; temperature was 40°С; flow rate was 100 μl/min; gradient elution mode was from 5% to 100% Eluent B for 40 min, then 100% Eluent B for 3 min; detection was performed at 277 nm. Retention time for metronidazole is 5.95 min. Since metronidazole is easy soluble and stable enough in the solutions of diluted alkalis 0.001 M sodium hydroxide solution has been proposed for preparation of the solutions in developing HPLC/UV-procedure of metronidazole quantification. Validation of the procedure has been carried out in the variants of the method of calibration curve and method of standard by such parameters as in process stability, linearity/calibration model, accuracy and precision within 3 different analytical runs using different batches of reagents and different glassware; experiments have been performed by three different analysts. New procedure of metronidazole quantitative determination by the method of HPLC/UV has been developed. Its validation has been carried out and acceptability for application has been shown.

EXPRESS: Laser-Induced Breakdown Spectroscopy (LIBS) Combined with Temporal Plasma Analysis of C2 Molecular Emission for Carbon Analysis in Coal

2021 ◽  
pp. 000370282110123
Author(s):  
Hemalaxmi Rajavelu ◽  
Nilesh J Vasa ◽  
Satyanarayanan Seshadri
Keyword(s):  
Elemental Carbon ◽  
Partial Least Square ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Calibration Model ◽  
Breakdown Spectroscopy ◽  
Persistence Time ◽  
Relative Standard ◽  
Laser Induced Breakdown ◽  
Spectral Intensities

A benchtop Laser-Induced Breakdown Spectroscopy (LIBS) is demonstrated to determine the elemental carbon content present in raw coal used for combustion in power plants. The spectral intensities of molecular CN and C2 emission are measured together with the atomic carbon (C) and other inorganic elements (Si, Fe, Mg, Al, Ca, Na, and K) in the LIBS spectrum of coal. The emission persistence time of C2 molecule emission is measured from the coal plasma generated by a nanosecond laser ablation with a wavelength of 266 nm in the Ar atmosphere. The emission persistence time of molecular C2 emission along with the spectral intensities of major ash elements (Fe, Si, Al, and Ca) and carbon emissions (atomic C, molecular CN, and C2) shows a better relationship with the carbon wt% of different coal samples. The calibration model to measure elemental carbon (wt%) is developed by combining the spectral characteristics (Spectral intensity) and the temporal characteristics (Emission persistence time of C2 molecule emission). The temporal characteristic studies combined with the spectroscopic data in the PLSR (Partial Least Square Regression) model has resulted in an improvement in the root mean square error of validation (RMSEV), and the relative standard deviation (RSD) is reduced from 10.86% to 4.12% and from 11.32% to 6.04%, respectively.

3D LiDAR-GPS/IMU Calibration Based on Hand-Eye Calibration Model for Unmanned Vehicle

2020 ◽  
Author(s):  
Chen Chen ◽  
Guangming Xiong ◽  
Zhehua Zhang ◽  
Jianwei Gong ◽  
Jianyong Qi ◽  
...  
Keyword(s):  
Calibration Model ◽  
Unmanned Vehicle ◽  
3D Lidar

The Error Analysis and the Error Calibration of the Bionic Polarized Light Compass

2020 ◽  
Author(s):  
Xu-dong Huang ◽  
Chen-hua Wang ◽  
Jing-run Pan ◽  
Jia-bin Chen ◽  
Chun-lei Song ◽  
...  
Keyword(s):  
Error Analysis ◽  
Polarized Light ◽  
Error Calibration
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