scholarly journals Evaluation and correction of systematic effects in a simultaneous 3-axis vibration calibration system

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 388
Author(s):  
A. Prato ◽  
F. Mazzoleni ◽  
A. Schiavi
Keyword(s):  
Frequency Domain ◽  
Calibration Method ◽  
Vibrational Modes ◽  
Calibration System ◽  
Excitation System ◽  
Vibration Excitation ◽  
Systematic Effects ◽  
Inclined Planes

This paper presents a calibration method, recently realized at INRIM, suitable for the calibration of 3-axis accelerometers in frequency domain. The procedure, allows to simultaneously evaluate the main and transverse sensitivities on three axes by means of a single-axis vibration excitation of inclined planes. Nevertheless, the excitation system is subjected to spurious motions mainly due to the vibrational modes of the inclined planes and to the horizontal motions of the shaker. In order to provide the proper sensitivities to the 3-axis sensors, the evaluation of systematic effects is experimentally carried out and the related correction is proposed.

The Design of HTG Automatic Calibration System Based on Fuzzy Theory

2012 ◽  
Vol 468-471 ◽  
pp. 1490-1494
Author(s):  
Qi Ren ◽  
Tian Fei Ren
Keyword(s):  
Control Theory ◽  
System Design ◽  
Fuzzy Theory ◽  
Calibration Method ◽  
Automatic Calibration ◽  
Matlab Simulation ◽  
Calibration System ◽  
Oil Tank ◽  
Fuel Level

ABSTRACT：It introduces a kind of an Automatic Calibration System, especially for long-term drift of oil tank gauging system. long-term drift serious influence on measuring the accuracy and reliability of the system. With theory of Hydrostatic Tank Gauging[1]（HTG），as soon as the long-term drift occurring, the detection drift of oil pressure valueΔp will drift，and soon other the parameters of tank Gauging will be occurred. Because the value of Δp is difficult to directly determine, This paper puts forward a kind of automatic calibration method to obtain Δp according to the fuel level drift Δh) indirectly,By means of the HTG double level switches and fuzzy control theory. At last, by MATLAB simulation verify the correctness of the system design.

Binocular Stereo Vision Calibration System Implementation of Grid Strain Measurement in Sheet Forming

2013 ◽  
Vol 397-400 ◽  
pp. 1547-1551
Author(s):  
Hui Yu Xiang ◽  
Bao An Han ◽  
Zhe Li ◽  
Jia Jun Huang
Keyword(s):  
Stereo Vision ◽  
Strain Measurement ◽  
Calibration Method ◽  
Sheet Forming ◽  
Calibration System ◽  
Camera Model ◽  
Distortion Factor ◽  
Binocular Stereo Vision ◽  
Binocular Stereo ◽  
Stereo Calibration

For the research of camera calibration in the system of grid strain measurement in sheet forming, the pinhole camera model, the nonlinear model of the camera and the binocular stereo model are analyzed, drawing a binocular stereo calibration method based on HALCON, which detailedly describes the calibration principle and specific calibration process. A binocular stereo vision calibration system based on VC6.0 is established, by which the influence on camera focus, distortion factor and principle points from the number of calibration images is verified by experiments.

Quantitative Spectrographic Analysis for in Situ Continuous Emission Monitoring

1993 ◽  
Vol 47 (4) ◽  
pp. 479-488 ◽  
Author(s):  
Alex Shlifshteyn ◽  
Fred D. Lang
Keyword(s):  
Frequency Domain ◽  
Environmental Control ◽  
Calibration Method ◽  
Frequency Domain Method ◽  
Continuous Emission ◽  
Emission Monitoring ◽  
Software Algorithms ◽  
Accurate Quantitative Analysis ◽  
Continuous Emission Monitoring

To determine the thermal efficiency and the effluent flow rates of fossil-fired boilers, Exergetic Systems has developed an in situ, dispersive interferometer. This Emissions Spectral Radiometer/Fuel Flow instrument (ESR/FF) can measure effluent concentrations with the high accuracies needed to make efficiency determinations and to meet environmental control requirements. This paper discusses the software algorithms developed to process the data from these instruments to provide accurate peak-to-peak normalization of measured absorbance data to HITRAN-generated data. After implementation of both signal-domain and frequency-domain normalization, the frequency-domain method was chosen because it was significantly faster to process. With the use of this analysis method and the pre-installation calibration method described herein, flue gas compounds are quantified with a sensitivity of 10 Δppm. This inexpensive and reliable instrument yields accurate quantitative analysis of flue gases for continuous emission monitoring (CEM) of fossil-fired boilers.

Laser interferometer calibration system for extensometers

1968 ◽  
Vol 58 (5) ◽  
pp. 1379-1383
Author(s):  
G. Hade ◽  
M. Conner ◽  
J. T. Kuo
Keyword(s):  
Laser Interferometer ◽  
Michelson Interferometer ◽  
Low Frequency ◽  
Calibration Method ◽  
Linear Range ◽  
Laser Source ◽  
Calibration System ◽  
Frequency Oscillator ◽  
Transducer Output ◽  
Optical Calibration

Abstract A laser interferometer technique has been developed for calibrating extensometers at the Ogdensberg Station of Lamont Geological Observatory. It provides remotecontrolled calibration of both horizontal and vertical extensometers within the linear range of the transducer output. The present calibration system consists of an electromagnetic driving unit and a Michelson interferometer. The transducer end of the extensometer is displaced longitudinally with an electromagnetic driving unit, which is excited by a variable low-frequency oscillator with a bandwidth of 0.0005 to 60 kHz. The resultant displacement is detected by counting fringe displacements of the interferometer with an Ne-He laser source. With this calibration system, motion as small as 0.03 micron can be determined with excellent repeatability and with errors of less than 5 per cent, in comparison with errors of more than 40 per cent for the optical calibration method previously used.

Illuminance meter calibration with an LED spectrally tunable light source

2020 ◽  
Vol 52 (8) ◽  
pp. 1009-1019 ◽  
Author(s):  
K Godo ◽  
Y Tamura ◽  
O Watari
Keyword(s):  
Light Source ◽  
Calibration Method ◽  
Reference Plane ◽  
Lamp Method ◽  
Calibration System ◽  
Indoor Lighting ◽  
Incandescent Lamps ◽  
Standard Lamp

Calibration of an illuminance meter is indispensable for accurate measurement of the illuminance of indoor lighting and daylight. In recent years, because of the phasing-out of incandescent lamps and their replacement with LED lamps, it has become difficult to obtain an incandescent type standard lamp to calibrate an illuminance meter. To replace the standard lamp method, we constructed an illuminance meter calibration system based on an LED-based spectrally tunable light source. The approximate CIE Illuminant A spectrum realized by the LED-based spectrally tunable light source was controlled at various illuminance values (800–10,000 lx). A test illuminance meter was calibrated by comparison against a reference photometer with the realized approximate Illuminant A spectrum. The illuminance values measured using the reference photometer and using the test illuminance meter in the calibration system agreed within 2.5% without reference plane correction of the test illuminance meter, and within 1% with reference plane correction. Reference plane correction depends strongly on the measurement distance and the illuminance meter structure. This study demonstrated that it can be improved. Therefore, we infer that an illuminance meter calibration method using an LED-based spectrally tunable light source is a promising means of overcoming difficulties posed by the phasing-out of incandescent standard lamps.

Calibration of Displacement Sensors with High-Precision and Large Measurement Range Using Temporal Speckle Pattern Interferometry

2006 ◽  
Vol 326-328 ◽  
pp. 91-94
Author(s):  
Xi De Li ◽  
Yan Yang
Keyword(s):  
Speckle Pattern ◽  
Calibration Method ◽  
Measurement Range ◽  
Electronic Speckle Pattern Interferometry ◽  
Correlation Property ◽  
Calibration System ◽  
Displacement Sensors ◽  
Time Calibration ◽  
Out Of Plane ◽  
Large Measurement

In the present study, a real-time calibration method for micro displacement sensors is introduced, and a calibration system is developed. SPCM, the sequence pulse counting method previously proposed by us, is capable of automatically determining both the larger range displacement and the performance of a sensor, such as the nonlinear error and the displacement sensitivity within a quarter of the light source wavelength. The new calibration system consists of a programmable motor driven platform, an out-of-plane sensitive electronic speckle pattern interferometry (ESPI), and a sequence image acquisition system. The platform is used to provide displacement changes of a moving component and its displacement is measured by the ESPI and calibrated sensor synchronously. The calibration accuracy of the proposed method is in the submicrometer level and the displacement range can be from sub-micrometer to millimeters depending on the storage capacity of the computer and the correlation property of the interferometer. Three capacitance-type displacement sensors have been calibrated successfully, whose displacement ranges are –300μm to 300μm, –30μm to 30μm, and –3μm to 3μm, respectively.

scholarly journals Design and Testing of a Co-Rotating Vibration Excitation System

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 92 ◽  
Author(s):  
Angelos Filippatos ◽  
Tino Wollmann ◽  
Minh Nguyen ◽  
Pawel Kostka ◽  
Martin Dannemann ◽  
...  
Keyword(s):  
Coordinate System ◽  
Dynamic Behaviour ◽  
Transverse Axis ◽  
Excitation System ◽  
Structural Dynamic ◽  
Non Invasive ◽  
Vibration Excitation ◽  
First Results ◽  
Design And Testing ◽  
Rotor Axis

A vibration excitation system (VES) in a form of an active coupling is proposed, designed and manufactured. The system is equipped with a set of piezoelectric stack actuators uniformly distributed around the rotor axis and positioned parallel to each other. The actuator arrangement allows an axial displacement of the coupling halves as well as their rotation about any transverse axis. Through the application of the VES an aimed vibration excitation is realised in a co-rotating coordinate system, which enables a non-invasive and precise modal analysis of rotating components. As an example, the VES is applied for the characterisation of the structural dynamic behaviour of a generic steel rotor at different rotational speeds. The first results are promising for both stationary and rotating conditions.

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