Effects of vibration in the pointer in a spring measuring head on the readout error

1981 ◽  
Vol 24 (12) ◽  
pp. 1033-1035
Author(s):  
S. B. Tarasov
Keyword(s):  
Measuring Head ◽  
Readout Error

Development of a Low-Power Instrumented Mouthpiece for Directly Measuring Head Acceleration in American Football

2021 ◽  
Author(s):  
Lee F. Gabler ◽  
Nathan Z. Dau ◽  
Gwansik Park ◽  
Alex Miles ◽  
Kristy B. Arbogast ◽  
...  
Keyword(s):  
Low Power ◽  
American Football ◽  
Head Acceleration ◽  
Measuring Head

Pilot study of an assessment tool for measuring head and neck lymphoedema

2014 ◽  
Vol 19 (Sup4) ◽  
pp. S6-S11 ◽  
Author(s):  
Jodie Nixon ◽  
Amanda Purcell ◽  
Jennifer Fleming ◽  
Andrew McCann ◽  
Sandro Porceddu
Keyword(s):  
Pilot Study ◽  
Head And Neck ◽  
Assessment Tool ◽  
Measuring Head

scholarly journals Assessment of the technical condition of lift guides using a magnetic field

2021 ◽  
Vol 2130 (1) ◽  
pp. 012003
Author(s):  
P Lonkwic ◽  
T Krakowski ◽  
H Ruta
Keyword(s):  
Early Stage ◽  
Technical Condition ◽  
Operating Conditions ◽  
Measuring Head ◽  
Cross Sectional ◽  
Correct Operation ◽  
Emergency Braking ◽  
Wear And Tear ◽  
Equipment Failures ◽  
Novel Concept

Abstract The systems that monitor individual components of machines and devices are under constant development. The ability to detect damages at an early stage allows failures to be prevented, so any uncontrolled downtime can be predicted in a controlled manner. Continuous monitoring of technical condition is an activity that also helps to reduce the losses due to equipment failures. However, not all areas can be monitored continuously. Such areas include lift guides where wear and tear can occur naturally, i.e. through abrasion of the material layer due to interaction with moving guide shoes or after emergency braking. Emergency braking causes local damages to the guide through plastic deformation of its surface resulting from indentation of the knurled roller of the brake. Such places are cleaned mechanically, which results in local reduction of the cross-sectional area. In such a case, it is difficult to continuously assess the technical condition of guides due to the prevailing operating conditions. Therefore, a concept of a head enabling assessment of the technical condition of guides at every stage of their operation has been developed. This article presents the novel concept of a magnetic head used for assessing the technical condition of lift guide rails that are the running track of lifting equipment. The initial tests were performed on the original test setup. The concept of the developed measuring head was verified for correct operation on specially prepared flat bars with holes. The results obtained in the form of laboratory tests proved that the proposed measuring head concept can be applied to the measurements under real conditions.

scholarly journals Observer Variability in Head Circumference Measurement Using Routine Versus Non-Stretchable Tapes in Children

2018 ◽  
Vol 37 (3) ◽  
pp. 238-243 ◽  
Author(s):  
Pareshkumar Amrutlal Thakkar ◽  
Kinjal Yagnik ◽  
Niyati T Parmar ◽  
Rashmi Ranjan Das ◽  
Ukti P Thakkar
Keyword(s):  
Correlation Coefficient ◽  
Outcome Measures ◽  
Teaching Hospital ◽  
Head Circumference ◽  
Tertiary Care ◽  
Observer Variability ◽  
Age Group ◽  
Measuring Head ◽  
Pediatric Department ◽  
Inter Observer Variability

Introduction: Observer variability is known in taking head circumference. Stretchable tapes do not provide accurate results after being used repeatedly. The aim of this study was to compare the intra-observer and inter-observer variability in measuring head circumference (HC) or occipito-frontal circumference (OFC) by using routine stretchable and non-stretchable tapes.Material and Methods: In this crosss-ectional study, all stable children in the age group of 1 month to 5 years attending the pediatric department of a tertiary care teaching hospital over six months period were included. The main outcome measures were: intra-observer & inter-observer variability in HC measurements by routinely used stretchable and non-stretchable tapes, and accuracy of readings of old stretchable tapes.Results: A total of 301 children were included. There was good correlation in the measurements taken by two observers (inter-observer), and three different readings of the same observer (intra-observer), correlation coefficient being > 0.99. With stretchable tape, 26% subjects had both intra-observer and inter-observer variability of ≥ 0.5 cm, which was 9.9% and 15.9% with the use of non-stretchable tape, respectively. Non-stretchable tape compared to stretchable tape had significantly less intra-observer (p < 0.001) and inter-observer variability (p=0.038).Conclusions: Observer variability was significantly less with the use of non-stretchable tapes compared to routinely used stretchable tapes. Old stretchable tapes used repeatedly over certain periods were not able to provide accurate readings.  

Laboratory Validation of Two Wearable Sensor Systems for Measuring Head Impact Severity in Football Players

2015 ◽  
Vol 44 (4) ◽  
pp. 1257-1274 ◽  
Author(s):  
Gunter P. Siegmund ◽  
Kevin M. Guskiewicz ◽  
Stephen W. Marshall ◽  
Alyssa L. DeMarco ◽  
Stephanie J. Bonin
Keyword(s):  
Head Impact ◽  
Football Players ◽  
Sensor Systems ◽  
Wearable Sensor ◽  
Measuring Head

scholarly journals Industrial X-ray Fluorescence Analyzer for Real-Time Thickness Measurements of Aluminium Coatings on Rolled Steel

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 425
Author(s):  
Sokolov ◽  
Hasikova ◽  
Pecerskis ◽  
Gostilo
Keyword(s):  
Real Time ◽  
Deposition Process ◽  
Automatic Process ◽  
Automatic Process Control System ◽  
Acceptance Test ◽  
Rolled Steel ◽  
Measuring Head ◽  
X Ray ◽  
The Status ◽  
Thickness Measurements

Aluminium coatings that are formed by physical vapour deposition (PVD) on rolled steel products are more resistant to atmospheric and seawater corrosion than zinc coatings. We developed a coating thickness analyzer (CTA) with an X-ray fluorescence (XRF) measuring head, that is integrated into the PVD pilot line. In this study, to conduct measurements of elements with atomic numbers less than 20 while avoiding the problem of registration of light elements, the measuring head was integrated into a process vacuum chamber to maintain a vacuum during the measurements. To validate the proposed tool, cold-rolled steel strips of different grades are used as substrates, and aluminium was deposited on the surface via PVD in thicknesses ranging from 1 to 20 g/m2. The thin-film thickness measurements during a pre-acceptance test were found to have a relative accuracy of less than 5% and a relative precision of less than 1% – 2%. The proposed CTA can be readily integrated in the factory’s automatic process control system and the real-time measurements in operating and calibration modes, and the status of all spectrometric equipment (X-ray tube, detector etc.) can be transmitted to the upper-level computer. Thus, the process engineer can properly control the deposition process.

scholarly journals TRACKING OF HEAD POSITION RELATIVE TO THE SCREEN USING HEAD MOUNTED CAMERA / GALVOS POZICIJOS NUSTATYMAS EKRANO ATŽVILGIU NAUDOJANT ANT GALVOS PRITVIRTINTĄ KAMERĄ

2013 ◽  
Vol 5 (2) ◽  
pp. 65-69
Author(s):  
Evaldas Borcovas ◽  
Gintautas Daunys
Keyword(s):  
Block Diagram ◽  
Head Position ◽  
Optimal Parameters ◽  
Measuring Head ◽  
Positioning Systems ◽  
Head Positioning ◽  
Edge Detection Method ◽  
Orientation Parameters ◽  
Dual Core ◽  
Maximum Measurement

In this paper head position locating systems were analyzed. There were reviewed scientific articles with different proposed methods. The chosen system is with the camera located on the user head. The main parameters of the head positioning systems were analyzed. The procedure laid down in what order parameters are found. The diagram of the system and detail block diagram of the algorithm were provided. Realization of the algorithm used: edge detection method (Sobel), the adjustment algorithm (Subpixel). System is realized in Matlab and C# environment. Determine the optimal parameters for the algorithm execution. Execution of the algorithm in Matlab environment is 1.2 s and C # environment – 126 ms. During the examination of the longest executing algorithm segment, it was found that image filtering is carried out in 107 ms. It is noted that the uncertainty of the algorithm can be divided into static and measurement. The maximum static uncertainty while measuring head position parameters is 1.63 mm and orientation parameters – 0.16°. The maximum measurement uncertainty while measuring head position parameters is 4 mm and orientation parameters – 0.11°. Santrauka Nagrinėjamos galvos padėties pozicionavimo sistemos. Apžvelgti moksliniai straipsniai, kuriuose pateikiami įvairūs siūlomi metodai. Pasirinkta sistema, kai kamera pritvirtinama vartotojui ant galvos. Išskirti pagrindiniai galvos padėties nustatymo parametrai, nustatytas parametrų suradimo eiliškumas, pateikta sistemos schema ir detali algoritmo blokinė schema. Algoritmui įgyvendinti taikyti briaunų radimo (Sobel) ir algoritmo tikslinimo (Subpixel) metodai. Sistema įgyvendinta Matlab ir C# aplinkose. Nustatyti optimalūs algoritmo vykdymo parametrai. Naudojamo kompiuterio procesorius Intel Pentium dual core T4500 – 2,3 GHz. Vidutinis algoritmo veikimo laikas Matlab aplinkoje yra 1,2 s, o C# aplinkoje – 126 ms. Ištyrus algoritmo segmentų vykdymo laiką, pastebėta, kad ilgiausiai vykdomas vaizdo filtravimas – 107 ms. Parodyta, kad algoritmo neapibrėžtis galima suskirstyti į statines ir matavimo neapibrėžtis. Maksimali statinė neapibrėžtis, matuojant galvos pozicijos padėtį, yra 1,63 mm, matuojant orientacijos parametrus – 0,16°. Maksimali matavimo neapibrėžtis yra 4,0 mm, matuojant galvos padėties parametrus, ir 0,11° – orientacijos parametrus.

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