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The device was used to measure the thermal effusivity of eight different liquid samples (distilled water, glycerol, acetone, ethanol, 2-propanol, chloroform, hexane, and methanol), as well as the effusivity of acetone in aqueous solution at distinct concentrations, giving good results. The instrument has a bandwidth of 10 Hz\u201310 kHz and a sensitivity of 1 \u03bcV.<\/jats:p>","DOI":"10.1063\/1.4997455","type":"journal-article","created":{"date-parts":[[2018,3,23]],"date-time":"2018-03-23T18:07:03Z","timestamp":1521828423000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Simple and portable low frequency lock-in amplifier designed for photoacoustic measurements and its application to thermal effusivity determination in liquids"],"prefix":"10.1063","volume":"89","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1667-2253","authenticated-orcid":false,"given":"Emmanuel","family":"Ortega-Robles","sequence":"first","affiliation":[{"name":"Secci\u00f3n de Bioelectr\u00f3nica, Departamento de Ingenier\u00eda El\u00e9ctrica, CINVESTAV-IPN 1 , A.P. 14-740, 07000 Ciudad de M\u00e9xico, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alfredo","family":"Cruz-Orea","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica, CINVESTAV-IPN 2 , A.P. 14-740, 07000 Ciudad de M\u00e9xico, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"El\u00edas-Vi\u00f1as","sequence":"additional","affiliation":[{"name":"Secci\u00f3n de Bioelectr\u00f3nica, Departamento de Ingenier\u00eda El\u00e9ctrica, CINVESTAV-IPN 1 , A.P. 14-740, 07000 Ciudad de M\u00e9xico, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2018,3,23]]},"reference":[{"key":"2023070420595724300_c1","doi-asserted-by":"publisher","first-page":"31","DOI":"10.1016\/j.measurement.2015.02.037","volume":"69","year":"2015","journal-title":"Measurement"},{"key":"2023070420595724300_c2","first-page":"1","volume":"48","year":"2014","journal-title":"Analog Dialogue"},{"key":"2023070420595724300_c3","doi-asserted-by":"publisher","first-page":"64","DOI":"10.1063\/1.322296","volume":"47","year":"1976","journal-title":"J. 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