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However, this requires load\u2010flexible and demand\u2010oriented electricity production by means of flexible feed management. However, these flexible feeding strategies using greatly oscillating, temporally varying high mass loads may lead to critical process failures of the anaerobic digestion process. Currently there is no online, high resolution gas quality measurement technique to detect and prevent biological process failures available. In this contribution, we present a miniaturized, low\u2010cost biogas quality measurement system providing data with high precision and high temporal resolution to overcome this technology gap. To highlight the capabilities of the system we have installed it using a bypass to the main biogas duct after hydrogen sulfide removal at a full\u2010scale research biogas plant. During a three\u2010month field trial, the effect of flexible feeding on the biogas quality has been monitored. The results demonstrate long\u2010term stability of the sensor solution and reveal the effects of changing feeding frequency and composition on gas quantity and quality, which cannot be detected with commercially available state\u2010of\u2010the\u2010art sensing systems.<\/jats:p>","DOI":"10.1002\/elsc.201900046","type":"journal-article","created":{"date-parts":[[2019,8,9]],"date-time":"2019-08-09T10:45:54Z","timestamp":1565347554000},"page":"700-710","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Investigating flexible feeding effects on the biogas quality in full\u2010scale anaerobic digestion by high resolution, photoacoustic\u2010based NDIR sensing"],"prefix":"10.1002","volume":"19","author":[{"given":"Benedikt","family":"Bierer","sequence":"first","affiliation":[{"name":"Laboratory for Gas Sensors Department of Microsystems Engineering University of Freiburg  Freiburg Germany"},{"name":"Fraunhofer Institute for Physical Measurement Techniques (IPM)  Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Kress","sequence":"additional","affiliation":[{"name":"State Institute of Agricultural Engineering and Bioenergy University of Hohenheim  Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hans\u2010Joachim","family":"N\u00e4gele","sequence":"additional","affiliation":[{"name":"State Institute of Agricultural Engineering and Bioenergy University of Hohenheim  Stuttgart Germany"},{"name":"Institut f\u00fcr Chemie &amp; Biotechnologie (ICBT) Z\u00fcrcher Hochschule f\u00fcr Angewandte Wissenschaften  W\u00e4denswil Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreas","family":"Lemmer","sequence":"additional","affiliation":[{"name":"State Institute of Agricultural Engineering and Bioenergy University of Hohenheim  Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Palzer","sequence":"additional","affiliation":[{"name":"Escuela Polit\u00e9cnica Superior Universidad Aut\u00f3noma de Madrid  Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,8,20]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2015.09.090"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.biortech.2014.08.123"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2016.10.073"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.enconman.2019.02.029"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.fuel.2015.05.063"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.fuel.2017.01.106"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/ceat.201500412"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1080\/09593330.2017.1308439"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00253-009-2246-7"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1088\/0957-0233\/24\/1\/015202"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1039\/C7AN01689A"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.3390\/s17122714"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.3390\/s18030709"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2019.04.083"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/elsc.201500014"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00216-003-1930-1"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1039\/c3cs60179j"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiotec.2005.07.016"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/0956-5663(92)90018-I"},{"key":"e_1_2_8_21_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3390\/fermentation4010018","article-title":"The use of UV\u2010vis spectroscopy in bioprocess and fermentation monitoring","volume":"4","author":"Roberts J.","year":"2018","journal-title":"Fermentation"},{"key":"e_1_2_8_22_1","unstructured":"Lehrer G. 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