Liquid Level Detection in Standard Capacity Measures with Machine Vision
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/8/2676 |
| _version_ | 1797538122088579072 |
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| author | Gregor Bobovnik Tim Mušič Jože Kutin |
| author_facet | Gregor Bobovnik Tim Mušič Jože Kutin |
| author_sort | Gregor Bobovnik |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T12:26:00Z |
| format | Article |
| id | doaj.art-52641b0fb5c6492caf451113830da7ff |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T12:26:00Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-52641b0fb5c6492caf451113830da7ff2023-11-21T15:01:03ZengMDPI AGSensors1424-82202021-04-01218267610.3390/s21082676Liquid Level Detection in Standard Capacity Measures with Machine VisionGregor Bobovnik0Tim Mušič1Jože Kutin2Laboratory of Measurements in Process Engineering, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, SloveniaLaboratory of Measurements in Process Engineering, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, SloveniaLaboratory of Measurements in Process Engineering, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, SloveniaCapacity 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.https://www.mdpi.com/1424-8220/21/8/2676liquid levelstandard capacity measurelegal metrologymachine visionparallax |
| spellingShingle | Gregor Bobovnik Tim Mušič Jože Kutin Liquid Level Detection in Standard Capacity Measures with Machine Vision Sensors liquid level standard capacity measure legal metrology machine vision parallax |
| title | Liquid Level Detection in Standard Capacity Measures with Machine Vision |
| title_full | Liquid Level Detection in Standard Capacity Measures with Machine Vision |
| title_fullStr | Liquid Level Detection in Standard Capacity Measures with Machine Vision |
| title_full_unstemmed | Liquid Level Detection in Standard Capacity Measures with Machine Vision |
| title_short | Liquid Level Detection in Standard Capacity Measures with Machine Vision |
| title_sort | liquid level detection in standard capacity measures with machine vision |
| topic | liquid level standard capacity measure legal metrology machine vision parallax |
| url | https://www.mdpi.com/1424-8220/21/8/2676 |
| work_keys_str_mv | AT gregorbobovnik liquidleveldetectioninstandardcapacitymeasureswithmachinevision AT timmusic liquidleveldetectioninstandardcapacitymeasureswithmachinevision AT jozekutin liquidleveldetectioninstandardcapacitymeasureswithmachinevision |