{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:19:50Z","timestamp":1760239190111,"version":"build-2065373602"},"reference-count":34,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2020,10,21]],"date-time":"2020-10-21T00:00:00Z","timestamp":1603238400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Australia Research Council Linkage","award":["ARC LP170100108"],"award-info":[{"award-number":["ARC LP170100108"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Melbourne Water Corporation has two large anaerobic lagoons at the Western Treatment Plant (WTP), Werribee, Victoria, Australia. The lagoons are covered using numerous sheets of high-density polyethylene (HDPE) geomembranes to prevent the emission of odorous gases and to harness biogas as a source of renewable energy. Some of the content of raw sewage can accumulate and form into a solid mass (called \u201cscum\u201d). The development of a large body of solid scum that rises to the surface of the lagoon (called \u201cscumbergs\u201d) deforms the covers and may affect its structural integrity. Currently, there is no method able to effectively \u201csee-through\u201d the opaque covers to define the spread of the scum underneath the cover. Hence, this paper investigates a new quasi-active thermal imaging method that uses ambient solar radiation to determine the extent of the solid matter under the geomembrane. This method was devised by using infrared thermography and a pyranometer to constantly monitor the transient temperature response of the HDPE geomembrane using the time varying ambient solar radiation. Newton\u2019s cooling law is implemented to define the resultant cooling constants. The results of laboratory-scale tests demonstrate the capability of the quasi-active thermography to identify the presence and the extent of solid matter under the cover. This paper demonstrates, experimentally, the importance of measuring the surface temperature of the cover and solar intensity profiles to obtain the cooling process when during variations in solar intensity during normal sunrise, sunset, daily transitioning from morning\u2013afternoon\u2013evening and cloud cover events. The timescale associated with these events are different and the results show that these daily transient temperature cycles of the geomembranes can be used to detect the extent of the accumulation of solid matter underneath the geomembrane. The conclusions from this work will be further developed for field trials to practically monitor the growth in the extent of the scum under the floating covers in WTP with the ambient solar energy.<\/jats:p>","DOI":"10.3390\/rs12203455","type":"journal-article","created":{"date-parts":[[2020,10,22]],"date-time":"2020-10-22T20:51:00Z","timestamp":1603399860000},"page":"3455","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Quasi-Active Thermal Imaging of Large Floating Covers Using Ambient Solar Energy"],"prefix":"10.3390","volume":"12","author":[{"given":"Yue","family":"Ma","sequence":"first","affiliation":[{"name":"Department of Mechanical &amp; Aerospace Engineering, Monash University, Clayton VIC 3800, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3227-7648","authenticated-orcid":false,"given":"Leslie","family":"Wong","sequence":"additional","affiliation":[{"name":"Department of Mechanical &amp; Aerospace Engineering, Monash University, Clayton VIC 3800, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0991-4293","authenticated-orcid":false,"given":"Benjamin Steven","family":"Vien","sequence":"additional","affiliation":[{"name":"Department of Mechanical &amp; Aerospace Engineering, Monash University, Clayton VIC 3800, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas","family":"Kuen","sequence":"additional","affiliation":[{"name":"Department of Integrated Planning, Melbourne Water Corporation, 990 La Trobe Street, Docklands, Melbourne VIC 3008, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jayantha","family":"Kodikara","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Monash University, Clayton VIC 3168, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wing Kong","family":"Chiu","sequence":"additional","affiliation":[{"name":"Department of Mechanical &amp; Aerospace Engineering, Monash University, Clayton VIC 3800, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,10,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Scheirs, J. (2009). A Guide to Polymeric Geomembranes: A Practical Approach, John Wiley & Sons.","DOI":"10.1002\/9780470748213"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Ong, W.H., Chiu, W.K., Kuen, T., and Kodikara, J. (2017). Determination of the State of Strain of Large Floating Covers Using Unmanned Aerial Vehicle (UAV) Aided Photogrammetry. Sensors, 17.","DOI":"10.3390\/s17081731"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"167","DOI":"10.1016\/j.infrared.2013.07.009","article-title":"Review of thermal imaging systems in composite defect detection","volume":"61","author":"Aldave","year":"2013","journal-title":"Infrared Phys. Technol."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Wong, L., Vien, B.S., Ma, Y., Kuen, T., Courtney, F., Kodikara, J., and Chiu, W.K. (2020). Remote Monitoring of Floating Covers Using UAV Photogrammetry. Remote Sens., 12.","DOI":"10.3390\/rs12071118"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Swiderski, W., and Vavilov, V.P. (2007, January 2\u20139). IR thermographic detection of defects in multi-layered composite materials used in military applications. Proceedings of the 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz Electronics, Cardiff, UK.","DOI":"10.1109\/ICIMW.2007.4516626"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"433","DOI":"10.1016\/S0963-8695(03)00052-5","article-title":"Transient thermography in the assessment of defects of aircraft composites","volume":"36","author":"Avdelidis","year":"2003","journal-title":"Ndt E Int."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.ndteint.2005.04.008","article-title":"Infrared thermography for inspecting the adhesion integrity of plastic welded joints","volume":"39","author":"Omar","year":"2006","journal-title":"Ndt E Int."},{"key":"ref_8","unstructured":"Flores-Bolarin, J., and Royo-Pastor, R. (2008, January 18\u201322). Infrared thermography: A good tool for nondestructive testing of plastic materials. Proceedings of the 5th European Thermal-Sciences Conference, Eindhoven, The Netherlands."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1016\/j.energy.2016.01.043","article-title":"Thermography-enhanced LCA (Life Cycle Assessment) for manufacturing sustainability assessment. The case study of an HDPE (High Density Polyethylene) net company in Italy","volume":"108","author":"Dassisti","year":"2016","journal-title":"Energy"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1340","DOI":"10.1016\/j.ijfatigue.2006.02.036","article-title":"Infrared thermographic techniques for non-destructive damage characterization of carbon fibre reinforced polymers during tensile fatigue testing","volume":"28","author":"Steinberger","year":"2006","journal-title":"Int. J. Fatigue"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1016\/j.infrared.2010.12.010","article-title":"Automatic detection of defects on polyethylene pipe welding using thermal infrared imaging","volume":"54","author":"Kafieh","year":"2011","journal-title":"Infrared Phys. Technol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1016\/j.infrared.2015.12.026","article-title":"Optically and non-optically excited thermography for composites: A review","volume":"75","author":"Yang","year":"2016","journal-title":"Infrared Phys. Technol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1016\/j.infrared.2013.03.006","article-title":"Infrared thermography for condition monitoring\u2013A review","volume":"60","author":"Bagavathiappan","year":"2013","journal-title":"Infrared Phys. Technol."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"531","DOI":"10.1016\/j.apenergy.2014.08.005","article-title":"Infrared thermography (IRT) applications for building diagnostics: A review","volume":"134","author":"Kylili","year":"2014","journal-title":"Appl. Energy"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1016\/j.compstruct.2008.02.010","article-title":"Pulsed thermography for non-destructive evaluation and damage growth monitoring of bonded repairs","volume":"88","author":"Genest","year":"2009","journal-title":"Compos. Struct."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1511","DOI":"10.1016\/S1359-835X(02)00139-2","article-title":"Non-destructive testing of structural composites and adhesively bonded composite joints: Pulsed thermography","volume":"33","author":"Schroeder","year":"2002","journal-title":"Compos. Part A Appl. Sci. Manuf."},{"key":"ref_17","unstructured":"Rajic, N., Rowlands, D., and Tsoi, K. (2010, January 22\u201324). An Australian perspective on the application of infrared thermography to the inspection of military aircraft. Proceedings of the 2nd International Symposium on NDT in Aerospace, Hamburg, Germany."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/j.ndteint.2012.02.008","article-title":"Depth prediction of non-air interface defect using pulsed thermography","volume":"48","author":"Zeng","year":"2012","journal-title":"Ndt E Int."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"515","DOI":"10.1002\/pip.520","article-title":"Quantitative evaluation of shunts in solar cells by lock-in thermography","volume":"11","author":"Breitenstein","year":"2003","journal-title":"Prog. Photovolt. Res. Appl."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1159","DOI":"10.17159\/2411-9717\/2015\/V115n12a3","article-title":"The impact of coal quality on the efficiency of a spreader stoker boiler","volume":"115","author":"Taole","year":"2015","journal-title":"J. South. Afr. Inst. Min. Metall."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Kroll, A., Baetz, W., and Peretzki, D. (2009, January 12\u201317). On autonomous detection of pressured air and gas leaks using passive IR-thermography for mobile robot application. Proceedings of the 2009 IEEE International Conference on Robotics and Automation, Kobe, Japan.","DOI":"10.1109\/ROBOT.2009.5152337"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Brooke, C. (2018). Thermal imaging for the archaeological investigation of historic buildings. Remote Sens., 10.","DOI":"10.3390\/rs10091401"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Xiao, C., Fu, B., Shui, H., Guo, Z., and Zhu, J. (2020). Detecting the Sources of Methane Emission from Oil Shale Mining and Processing Using Airborne Hyperspectral Data. Remote Sens., 12.","DOI":"10.3390\/rs12030537"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1384","DOI":"10.1080\/10962247.2014.955926","article-title":"Thermal conductivity characteristics of dewatered sewage sludge by thermal hydrolysis reaction","volume":"64","author":"Song","year":"2014","journal-title":"J. Air Waste Manag. Assoc."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"803","DOI":"10.1016\/j.cemconres.2004.04.027","article-title":"The thermal conductivity mechanism of sewage sludge ash lightweight materials","volume":"35","author":"Wang","year":"2005","journal-title":"Cem. Concr. Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1016\/j.biortech.2013.01.090","article-title":"Self-heating co-pyrolysis of excessive activated sludge with waste biomass: Energy balance and sludge reduction","volume":"133","author":"Ding","year":"2013","journal-title":"Bioresour. Technol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1062","DOI":"10.2136\/sssaj2018.11.0434","article-title":"Specific heat capacity of soil solids: Influences of clay content, organic matter, and tightly bound water","volume":"83","author":"Wang","year":"2019","journal-title":"Soil Sci. Soc. Am. J."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Zeri, M., \u00c1lvala, R.C.S., Carneiro, R., Cunha-Zeri, G., Costa, J.M., Spatafora, L.R., Urbano, D., Vall\u00b7llossera, M., and Marengo, J.A. (2018). Tools for communicating agricultural drought over the Brazilian Semiarid using the soil moisture index. Water, 10.","DOI":"10.3390\/w10101421"},{"key":"ref_29","first-page":"959","article-title":"Conversion of bio-solids (scum) from tannery effluent treatment plant into biodiesel","volume":"40","author":"Balasubramanian","year":"2018","journal-title":"Energy Sources Part A Recovery Util. Environ. Eff."},{"key":"ref_30","unstructured":"Bergman, T.L., and Lavine, A.S. (2017). Fundamentals of Heat and Mass Transfer, John Wiley & Sons, Inc."},{"key":"ref_31","unstructured":"FLIR (2016). User\u2019s Manual FLIR A6xx Series, FLIR systems."},{"key":"ref_32","unstructured":"Apogee (2020). Apogee Instruments Owner\u2019s Manual Pyranometer Models SP-110 and SP-230, Apogee."},{"key":"ref_33","first-page":"1134","article-title":"Study on pulsed thermography for water ingress detection in composite honeycomb panels","volume":"33","author":"Guo","year":"2012","journal-title":"Hangkong Xuebao Acta Aeronaut. Astronaut. Sin."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1016\/S1537-5110(03)00112-0","article-title":"Thermal Properties of Soils as affected by Density and Water Content","volume":"86","year":"2003","journal-title":"Biosyst. Eng."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/20\/3455\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T10:25:21Z","timestamp":1760178321000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/20\/3455"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,10,21]]},"references-count":34,"journal-issue":{"issue":"20","published-online":{"date-parts":[[2020,10]]}},"alternative-id":["rs12203455"],"URL":"https:\/\/doi.org\/10.3390\/rs12203455","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2020,10,21]]}}}