scholarly journals Distance Measurement Systems Using Lasers and Their Applications

2017 ◽  
Vol 9 (4) ◽  
pp. 33
Author(s):  
Joao Antonio Santos Dias Fonseca ◽  
Antonio Baptista ◽  
Ma Joao Martins ◽  
Joao Paulo N. Torres
Keyword(s):  
Future Development ◽  
Technological Progress ◽  
Distance Measurement ◽  
Measurement Methods ◽  
Measuring Systems ◽  
Measurement Systems ◽  
Advantages And Disadvantages ◽  
Set Up ◽  
Complex Methods ◽  
Methods Of Measurement

Optical measuring systems came to offer new ways to determine distances, deformations or vibrations through more accurate and greater range methods. Technological progress has allowed a significant improvement of several components, including the optical ones. Thus, the development of essential measurement methods is crucial to keep up with technological advances.In this paper, the three basic methods of measurement are studied – triangulation, telemetry and interferometry, covering their main applications, advantages and disadvantages, and theoretically substantiating each of the methods. The results of simulation routines for each method are shown along this work. For the triangulation method we made two experiments which demonstrate the functioning of the method in measuring distances and surfaces.For the telemetry method, experimental setups were studied to apply the method of pulse telemetry and phase comparison telemetry to measure distances,Thus, it is intended to set up the basis for the future development of more complex methods.

scholarly journals Overview of new types of torque force sensors

2020 ◽  
Vol 6 (1) ◽  
pp. 5-14
Author(s):  
Timur A. Raianov
Keyword(s):  
Automatic Measurement ◽  
Operating Conditions ◽  
Transport Systems ◽  
Torque Measurement ◽  
Measuring Systems ◽  
Control Center ◽  
Measurement Systems ◽  
Advantages And Disadvantages ◽  
Software Models ◽  
Pulp Paper

In recent years, modern torque measurement systems have become very popular. they are used in road, rail, aviation and ship transport, as well as in the pulp, paper, and metallurgical industries. These metrological systems provide accurate torque measurement in difficult operating conditions as well as in aggressive environments. Thanks to the introduction of microprocessors in these devices, it became possible to increase the speed, it became possible to connect automatic torque tracking systems via a network interface to a single automatic control center and to perform remote control of torque sensors. With the use of modern software increases communication automatic torque measurement systems. Various software models are being developed for automatic torque measurement systems that have the ability to either partially simulate this system or work as an assistant device adapting automatic measurement systems to various uncertainties such as ambient temperature and properties of ferromagnetic materials. Safety of operation of transport systems, load-lifting devices and production facilities is increased. The purpose of this article is to review and analyze new types of torque sensors well-known manufacturers. The design and composition of modern measuring systems are considered and their advantages and disadvantages are analyzed. The technical description for each of the torque converters is given.

scholarly journals Modern Displacement Measuring Systems Used in Geotechnical Laboratories: Advantages and Disadvantages

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4139
Author(s):  
Małgorzata Jastrzębska
Keyword(s):  
Fiber Bragg Grating ◽  
Organic Soil ◽  
Mechanical Parameters ◽  
Measuring Systems ◽  
X Ray ◽  
Measurement Systems ◽  
Advantages And Disadvantages ◽  
Small Strains ◽  
Swelling Soil

The paper presents the contemporary displacement measurement systems used in geotechnical laboratories during the determination of soil precise mechanical parameters, e.g., the shear modules G: initial and in the range of small and very small strains. In the laboratory, researchers use standard sensors for measuring deformation, pressure, and force as well as modern measuring systems such as linear variable differential transformers (LVDT), proximity transducers (PT), magnetic encoder sensors with fiber Bragg grating (FBG), or methods based on laser or X-ray measurement. None of the measurements are universal and their use depends on the type of soil (cohesive, non-cohesive), its condition (loose or dense, stiff or very soft), and its characteristic properties (e.g., organic soil, swelling soil). This study points out the interesting equipment solutions and presents the guidelines for selecting appropriate methods of deformation measurement.

scholarly journals Biomechanics of insect cuticle: an interdisciplinary experimental challenge

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Karen Stamm ◽  
Brian Daniel Saltin ◽  
Jan-Henning Dirks
Keyword(s):  
Meta Analysis ◽  
Biomechanical Properties ◽  
Measurement Methods ◽  
Insect Cuticle ◽  
Body Parts ◽  
Scientific Methods ◽  
Advantages And Disadvantages ◽  
Examination Techniques ◽  
Evolutionary Success ◽  
Experimental Challenge

AbstractThe cuticle exoskeleton plays a key role in facilitating the evolutionary success of insects. Since the mid of the last century, many different biomechanical properties of exoskeletons have been investigated, always utilizing the most sophisticated scientific methods available at the time. So far, information on the biomechanical properties of cuticle seems to be as diverse as the methods used to measure them. As a consequence, insect cuticle is often considered to exhibit the most complex and diverse biomechanical properties of any biological material. However, it remains unclear which role the respective measurement methods and sample treatments used in previous studies play in supporting this claim. This review provides a broad overview of examination techniques used to study biomechanical properties of insect exoskeletons and discusses their respective advantages and disadvantages in describing the properties of a complex material such as cuticle. Our meta-analysis of the present data confirms significant effects of the respective measurement methods, sample treatments and body parts on the obtained mechanical properties. Based on our findings, we highlight research gaps and point out important factors which should be taken into account in future studies on insect cuticle.

Calibration set-up for energy measuring systems installed in AC railway systems

2020 ◽  
Author(s):  
F. Garnacho ◽  
J. Rovira ◽  
A. Khamlichi ◽  
P. Simon ◽  
T. Garcia ◽  
...  
Keyword(s):  
Measuring Systems ◽  
Railway Systems ◽  
Set Up

Dilatation of Vascular Prostheses in Ascending Aortic Position: A Long-Term Follow-Up Computed Tomography Study with Comparison of Different Measurement Methods

2016 ◽  
Vol 66 (03) ◽  
pp. 206-214
Author(s):  
Matthias Endlich ◽  
Christian Krämer ◽  
Chris Probst ◽  
Armin Welz ◽  
Kai Wilhelm ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Measurement Methods ◽  
Point Of View ◽  
Cross Sectional ◽  
Vascular Prostheses ◽  
Aortic Replacement ◽  
Ascending Aortic Replacement ◽  
Long Term Follow Up ◽  
Methods Of Measurement

Background The aim of this study was to evaluate long-term dilatation of Hemashield Gold and Hemashield Platinum vascular prostheses in ascending aortic position using different measurement methods to obtain precise results. Methods Between 1999 and 2007, 73 patients with Stanford type A dissection received ascending aortic replacement with Hemashield Gold and Hemashield Platinum prostheses. Measurements were performed using multiplanar reconstruction mode of electrocardiogram (ECG)-gated, multislice spiral computed tomography (MSCT) in strictly orthogonal cross-sectional planes. Different methods of measurement were compared and maximum dilatation was estimated for different time spans. Results Diameters calculated from the measured circumference showed a significant (p = 0.037) but clinically not relevant difference (0.1 mm) to the mean between the largest and the shortest cross-sectional diameter of the prosthesis. Dilatation after 24.2 ± 10.2 months was 8.5 ± 4.5%. Long-term dilatation after 91.8 ± 34 months amounted to 11.8 ± 4.2%. Conclusion Based on ECG-gated MSCT images, the presented methods of measurement provided reliable results. Long-term analysis shows low dilatation rates for Hemashield prostheses, which therefore can be considered as safe from this point of view. Nevertheless, a maximal dilatation of 20% could be relevant in valve sparing root replacement. It remains unclear if a dilatation like this contributes to the formation of suture aneurysms.

Perceived Advantages and Disadvantages of Nonsmoking Sections in Restaurants: Topics to Communicate to Restaurateurs

1989 ◽  
Vol 9 (4) ◽  
pp. 299-304 ◽  
Author(s):  
Gerardo Marin ◽  
Raymond J. Gamba
Keyword(s):  
San Francisco ◽  
Advantages And Disadvantages ◽  
Set Up

Results from interviews with 315 restaurateurs in San Francisco are reported on their perceptions of the advantages and disadvantages of having a nonsmoking section in their restaurants. The major advantage of having a nonsmoking section independent of whether one is present is to please customers. The most commonly mentioned disadvantage for those restaurants with nonsmoking sections is the fact that it is inconvenient to clients' seating preferences primarily because it breaks up dining parties. Efforts at convincing restaurateurs to set up nonsmoking sections may be directed at pointing out savings in cleaning, labor, insurance, and the improvement of the health of their employees together with meeting clients' desires.

Cross Calibration by FFT Equalization

1997 ◽  
Vol 119 (2) ◽  
pp. 236-242 ◽  
Author(s):  
K. Peleg
Keyword(s):  
Measurement Method ◽  
Functional Relationship ◽  
Measurement Methods ◽  
New Method ◽  
Measurement Systems ◽  
True Value ◽  
Calibration Problem ◽  
Regression Techniques ◽  
The Cross ◽  
Cross Calibration

The classical calibration problem is primarily concerned with comparing an approximate measurement method with a very precise one. Frequently, both measurement methods are very noisy, so we cannot regard either method as giving the true value of the quantity being measured. Sometimes, it is desired to replace a destructive or slow measurement method, by a noninvasive, faster or less expensive one. The simplest solution is to cross calibrate one measurement method in terms of the other. The common practice is to use regression models, as cross calibration formulas. However, such models do not attempt to discriminate between the clutter and the true functional relationship between the cross calibrated measurement methods. A new approach is proposed, based on minimizing the sum of squares of the differences between the absolute values of the Fast Fourier Transform (FFT) series, derived from the readings of the cross calibrated measurement methods. The line taken is illustrated by cross calibration examples of simulated linear and nonlinear measurement systems, with various levels of additive noise, wherein the new method is compared to the classical regression techniques. It is shown, that the new method can discover better the true functional relationship between two measurement systems, which is occluded by the noise.

Measuring complex for monitoring carbon dioxide in air

2021 ◽  
pp. 68-71
Author(s):  
Igor M. Ageev ◽  
Yuri M. Rybin
Keyword(s):  
Carbon Dioxide ◽  
High Selectivity ◽  
Distilled Water ◽  
Measuring Systems ◽  
Advantages And Disadvantages ◽  
Measuring Complex ◽  
Co2 Level ◽  
Carbon Dioxide Co2 ◽  
Term Monitoring

The advantages and disadvantages of infrared and electrochemical gas analyzers for carbon dioxide CO2 are described. The possibility of using conductometric sensors with distilled water for monitoring the CO2 content in the air has been investigated. Two identical measuring systems were manufactured, each containing two open-type conductometric cells, a matching device and a personal computer. With the help of these complexes, experiments were carried out on the simultaneous measurement of the CO2 content in the air in two places (a laboratory room and a building in a forest, located at a distance of 15 km from each other) with deliberately different daily dynamics of the CO2 level change. A special experiment was carried out, which made it possible to obtain an estimate of the inertia of conductometric cells and a conversion factor for the values of CO2 content into standard units of measurement. It is shown that the daily dynamics of changes in the electrical conductivity of distilled water in open cells corresponds to the expected dynamics of changes in the CO2 content in the rooms where the measurements were carried out. The operability of the measuring complex and the possibility of creating on its basis a device for long-term monitoring of the CO2 content in the air mixture of gases has been confirmed. The principal high selectivity of the measuring complex to CO2 in relation to other gases of the atmosphere has been established.

Methods of temperature measurement in microwave heating technologies

2021 ◽  
pp. 20-28
Author(s):  
Boris A. Lapshinov
Keyword(s):  
Temperature Measurement ◽  
Microwave Heating ◽  
Microwave Radiation ◽  
Electromagnetic Fields ◽  
Optical Measurement ◽  
Measurement Methods ◽  
Heating Systems ◽  
Measurement Systems ◽  
Processed Material ◽  
Spectral Pyrometry

In industrial technological processes associated with the heating of the processed material by microwave radiation, it is necessary to measure the temperatures of objects. Methods for measuring temperatures in the fields of technology using microwave heating systems are considered. The main possibilities, disadvantages and limitations of the used contact and non-contact (optical) measurement methods are determined. The requirements for temperature measurement systems under conditions of exposure to strong electromagnetic fields are listed. The possibilities of the spectral pyrometry method are especially noted.

Multi-phase information aggregation and dynamic synthetic evaluation based on grey inspiriting control lines

2014 ◽  
Vol 4 (2) ◽  
pp. 154-163 ◽  
Author(s):  
San-dang Guo ◽  
Sifeng Liu ◽  
Zhigeng Fang ◽  
Lingling Wang
Keyword(s):  
Future Development ◽  
Information Aggregation ◽  
Development Trend ◽  
Future Application ◽  
Phase Information ◽  
Content Type ◽  
Multi Stage ◽  
Comprehensive Evaluations ◽  
Set Up ◽  
Multi Phase

Purpose – The purpose of this paper is to put forward a multi-stage information aggregation method based on grey inspiriting control lines to evaluate the objects dynamically and comprehensively. Design/methodology/approach – According to the evaluation value of the objects, the positive and negative incentive lines were set up and the predicted values were solved based on the grey GM(1, 1) model, so the value with expected information could be evaluated. In the evaluation, the part above the positive incentive line should be “rewarded” and that below the negative incentive line should be “punished” appropriately. Thereby the double incentive effects of “the current development situation and future development trend” to objects could be implemented on the basis of control. Findings – This method can primarily describe the decision maker's expectancy of the development of evaluation objects and make the evaluation results have better practical application value. Research limitations/implications – Many comprehensive evaluations were always based on the past information. However, the future development trend of the evaluated object is also very important. This study can be used in the evaluation for future application and development. Originality/value – The paper succeeds in providing not only a method of multi-phase information aggregation with expectancy information, but also a simple and convenient method solving nonlinear inspiring lines objectively.

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