![\"EtOH](\"http:\/\/jimlund.org\/blog\/wp-content\/uploads\/2025\/05\/EtOH_MeOH_spectra.png\")
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For Wavenumber \/ \u03bcm conversion, see Plyer, 1953<\/a>.<\/p>\n\n\n\n Methods for determining ethanol concentration in water.<\/strong> Raman spectroscopy Simple \/ DIY versions:<\/p>\n\n\n\n NIR gas analysis<\/strong> Intoxilyzer–Lion Labs \/ CMC, specs<\/a><\/p>\n\n\n\n An IR emitter shines in chamber w\/ gas, 3.4 um and 9.34 um bandpass detectors are outside, sense through plastic cover. 9.50 \u03bcm, 400 nm BW, USEQGSEH950180, $13 FTIR liquid analysis<\/strong> This usually is a infrared spectroscopy technique, so a diffraction grating is necessary and moving parts to scan over the frequency range. This reduces source light intensity and increases complexity. The solution is more general.<\/p>\n\n\n\n College lab in FTIR<\/a><\/p>\n\n\n\n IR LED system patent using a tunable IR dichromic \/ interference filter: link<\/a>. This filter is expensive and hard to source.<\/p>\n\n\n\n Use one or more IR diodes to measure IR adsorption by ethanol Mid IR filters, 500 nm range $315<\/a>; narrow bandpass, $265<\/a><\/p>\n\n\n\n Enzymatic \/ fluorescent<\/strong> <\/p>\n\n\n\n Related item, precision CO2 sensor using NDIR, $60<\/a> For Wavenumber \/ \u03bcm conversion, see Plyer, 1953. Methods for determining ethanol concentration in water. Raman spectroscopyGeneral info about specs: https:\/\/kpu.pressbooks.pub\/organicchemistry\/chapter\/6-3-ir-spectrum-and-characteristic-absorption-bands\/ Simple \/ DIY versions: NIR gas analysisPaper on measuring ethanol from head gas, link. Uses a Binos 100 gas analyzer, see the manual, principal of operation on p59-60. Uses two interference filters, one for […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-795","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/pages\/795","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=795"}],"version-history":[{"count":7,"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/pages\/795\/revisions"}],"predecessor-version":[{"id":2868,"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/pages\/795\/revisions\/2868"}],"wp:attachment":[{"href":"http:\/\/jimlund.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/strong>General info about specs: https:\/\/kpu.pressbooks.pub\/organicchemistry\/chapter\/6-3-ir-spectrum-and-characteristic-absorption-bands\/<\/p>\n\n\n\n
Paper on measuring ethanol from head gas, link<\/a>. Uses a Binos 100 gas analyzer, see the manual<\/a>, principal of operation on p59-60. Uses two interference filters, one for ethanol absorbance region (4300nm), other for reference (4000nm) where no absorbance is expected.<\/p>\n\n\n\n
Bandpass detectors:<\/p>\n\n\n\n
3.30 \u03bcm, 130 nm BW, USEQGSEACH4180, $15
3.91 \u03bcm, 90 nm BW, USEQFSEA391180, $14
Kemet range of IR sensors, 1-4 channels, https:\/\/www.kemet.com\/en\/us\/sensors\/environmental-sensors\/gas-detection.html, also .\/pics\/Raman\/KEM_SE0215_QDC-3316800.pdf<\/p>\n\n\n\n
Using ATR<\/a> with a zinc selenide crystal. ZnSe crystals are farily expensive and hard to source.<\/p>\n\n\n\n
IR LED, 4200nm, 0.010 mW Quasi-CW, 0.2 mW Pulsed, $70<\/a>
LED43 10 \u03bcW (200 \u03bcW Pulsed), TO18, $37.5<\/a>. Broad spectrum 3000-5000nm.<\/p>\n\n\n\n
College chem lab<\/a><\/p>\n\n\n\n
MH-Z19 carbon dioxide gas sensor (hereinafter referred to as the sensor) is a generic type, small sensors, using non dispersive infrared (NDIR) principle to detect the air in the presence of CO2, with good selectivity and no oxygen dependence and long service life. Built in temperature compensation, with digital output and waveform output, easy to use. The sensor is a high performance sensor which is combined with the mature infrared absorption gas detection technology and the precise optical path design and the excellent circuit design.
Cell phone Raman spetrophotometer
collimating lens used in the spectrometer was \u223c25 mm in diameter, with a 60 mm focal length
Related item, precision CO2 sensor using NDIR, $60<\/a>
MH-Z19 carbon dioxide gas sensor (hereinafter referred to as the sensor) is a generic type, small sensors, using non dispersive infrared (NDIR) principle to detect the air in the presence of CO2, with good selectivity and no oxygen dependence and long service life. Built in temperature compensation, with digital output and waveform output, easy to use. The sensor is a high performance sensor which is combined with the mature infrared absorption gas detection technology and the precise optical path design and the excellent circuit design.
Cell phone Raman spetrophotometer
collimating lens used in the spectrometer was \u223c25 mm in diameter, with a 60 mm focal length
lens (\u223c10 mm focal length and 4 mm diameter)<\/p>\n","protected":false},"excerpt":{"rendered":"