Traceability and uncertainty analysis in volume measurements

Lorefice, Salvatore

doi:10.1016/j.measurement.2009.07.016

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…Step 5: Parallax Correction Since the camera was positioned perpendicular to the measuring scale (γ = 0°), the parallax correction was based on Equation (4). The values of all parameters appearing in Finally, the liquid level L 1 (as defined in Figure 1 or Figure 5) is calculated from the detected pixel value of the liquid level r liquid as follows:…”

Section: Step 3: Liquid Level Detectionmentioning

confidence: 99%

“…Step 5: Parallax Correction Since the camera was positioned perpendicular to the measuring scale (γ = 0 • ), the parallax correction was based on Equation (4). The values of all parameters appearing in this equation are given in Table 1.…”

Section: Step 3: Liquid Level Detectionmentioning

confidence: 99%

“…For type approval tests, the requirement for the expanded uncertainty of the determination of errors on the indication of the measured quantity is one-fifth of the maximum permissible error, i.e., 0.1% for measuring systems with an accuracy class of 0.5 [2]. For all capacity measures, the diameter of the neck or of the glass gauge should be large enough to minimize the capillary and meniscus effects; however, the reading of the meniscus (its curvature and fluctuations) represents an important contribution to the uncertainty and repeatability of the volume determined by standard capacity measures [3,4]. The operator needs to be certain that the reading uncertainty is small enough in view of the requirement for the combined expanded uncertainty.…”

Section: Introductionmentioning

confidence: 99%

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Liquid Level Detection in Standard Capacity Measures with Machine Vision

Bobovnik

Mušič

Kutin

2021

Sensors

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Capacity measures are commonly used volume standards for testing measuring systems for liquids other than water. Manual readings from the measuring scale can often be difficult due to the location of the capacity measure or to the nature of the measured liquid. This article focuses on the automation of this procedure by using a single camera machine vision system. A camera positioned perpendicular to the transparent neck captures the image of the liquid meniscus and the measuring scale. The volume reading is determined with the user-defined software in the LabVIEW programming environment, which carries out the image preprocessing, detection of the scale marks and the liquid level, correction of lens distortion and parallax effects and final unit conversions. The realized measuring system for liquid level detection in standard capacity measures is tested and validated by comparing the automated measurement results with those taken by the operators. The results confirm the appropriateness of the presented measuring system for the field of legal metrology.

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Section: Step 3: Liquid Level Detectionmentioning

confidence: 99%

Section: Step 3: Liquid Level Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Liquid Level Detection in Standard Capacity Measures with Machine Vision

Bobovnik

Mušič

Kutin

2021

Sensors

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“…El material volumétrico, así como las micropipetas (High Tech Lab) fueron calibrados mediante el método gravimétrico (Batista et al 2009, Lorefice 2009, Liang et al 2013, con una balanza analíti-ca marca Vibra modelo AF-R220E 220/0.0001g (Max/d). Esta balanza previamente fue calibrada con un juego de masas patrón de laboratorio (0.2, 0.5, 1 y 100 g) marca Rice Like, certificadas por la Entidad Mexicana de Acreditación (EMA).…”

Section: Calibración De Balanza Analítica Materials Volumétrico Y Micunclassified

Validación De Un Método Analítico Para Cuantificar Aluminio en Tejidos De Ratas Sprague Dawley Mediante Eaa-Flama Y Eaa-Horno De Grafito

García-Alegría

Astiazarán-García

Anduro-Corona

et al. 2018

Rev. Int. Contam. Ambie.

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Palabras clave: espectroscopia de absorción atómica, metales, roedores RESUMEN Se validó el método para cuantificar aluminio (Al) en tejidos de ratas Sprague Dawley mediante espectroscopia de absorción atómica por flama (EAA-F) y por horno de grafito (EAA-HG). La linealidad se evaluó mediante el coeficiente de correlación (r), cuyos resultados fueron de 1.000 y 0.9993 para EAA-F y EAA-HG, respectivamente. La exactitud fue de 100.62 y 97.75 % de recuperación, en tanto que la precisión fue de 0.61 y 1.30 % del coeficiente de variación para EAA-F y EAA-HG, respectivamente. La precisión también se evaluó en condiciones de repetibilidad; el resultado obtenido indica que el método es repetible para las concentraciones de aluminio (Al) utilizadas y determinadas por EAA-F y EAA-HG. Los resultados de límite de detección y límite de cuantificación para Al determinados por EAA-F fueron de 0.06 y 0.19 mg/L, y de 0.05 y 0.18 µg/L por EAA-HG. Por otro lado, se evaluó la exactitud del método analítico con un material de referencia certificado de tejido de ostión (NIST-1566b) digerido en horno de microondas, el cual contiene una concentración 197.2 ± 6.0 mg de Al/Kg de tejido. Los resultados obtenidos para la exactitud a través del porcentaje de recuperación fueron de 100.60 % para EAA-F y de 100.51 % para EAA-HG. La aplicabilidad del método se evaluó mediante la fortificación de tejidos de ratas (mama, cerebro, hígado y hueso), así como controles digeridos en horno de microondas. Los resultados obtenidos para la exactitud mediante el porcentaje de recuperación fluctuaron entre 99.32 y 109.00.

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“…have been established over 20 years to calibrate volumetric apparatus and liquid-handling devices with the capacity from 100 μl to 2 l. Standard operation procedures (SOP), traceability and uncertainty of the gravimetric approach in calibration of liquid-handling devices have been researched and discussed many times [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Novel gravimetric measurement technique for quantitative volume calibration in the sub-microliter range

Dong¹,

Steinert

Bammesberger

et al. 2012

Meas. Sci. Technol.

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We present a novel measurement method based on the gravimetric principles adapted from the ASTM E542 and ISO 4787 standards for quantitative volume determination in the sub-microliter range. Such a method is particularly important for the calibration of non-contact micro dispensers as well as other microfluidic devices. The novel method is based on the linear regression analysis of continuously monitored gravimetric results and therefore is referred to as ‘gravimetric regression method (GRM)’. In this context, the regression analysis is necessary to compensate the mass loss due to evaporation that is significant for very small dispensing volumes. A full assessment of the measurement uncertainty of GRM is presented and results in a standard measurement uncertainty around 6 nl for dosage volumes in the range from 40 nl to 1 µl. The GRM has been experimentally benchmarked with a dual-dye ratiometric photometric method (Artel Inc., Westbrook, ME, USA), which can provide traceability of measurement to the International System of Units (SI) through reference standards maintained by NIST. Good precision (max. CV = 2.8%) and consistency (bias around 7 nl in the volume range from 40 to 400 nl) have been observed comparing the two methods. Based on the ASTM and ISO standards on the one hand and the benchmark with the photometric method on the other hand, two different approaches for establishing traceability for the GRM are discussed.

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Traceability and uncertainty analysis in volume measurements

Cited by 17 publications

References 5 publications

Liquid Level Detection in Standard Capacity Measures with Machine Vision

Liquid Level Detection in Standard Capacity Measures with Machine Vision

Validación De Un Método Analítico Para Cuantificar Aluminio en Tejidos De Ratas Sprague Dawley Mediante Eaa-Flama Y Eaa-Horno De Grafito

Novel gravimetric measurement technique for quantitative volume calibration in the sub-microliter range

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