fa Mach-Zehnder interferometric fiber optic sensor for measuring methyl orange dye concentration in water تخصصی Special پژوهشي Research An intensity-based Mach-Zehnder interferometric fiber optic sensor using multimode&ndash;single-mode&ndash;multimode configuration is developed to measure methyl orange concentration in water. The transmission spectrum of the sensor is monitored at 460 nm while subjected to different concentrations of methyl orange (MO) solutions. The transmitted light intensity percent is proportional to the methyl orange concentration. This sensor shows&nbsp; a sensitivity of -37.2 and -37.9 dBm/ppm&nbsp; for the measurement of MO concentration in DI and Tehran tap water, respectively. This sensor offers easy fabrication, fast response, online monitoring, and proper linear response at low concentrations beside other advantages of fiber optic sensors.<span dir="RTL"><span style="font-family:B Nazanin;"></span></span> <strong>An intensity-based Mach-Zehnder interferometric fiber optic sensor using multimode&ndash;single-mode&ndash;multimode configuration is developed to measure methyl orange concentration in water. The transmission spectrum of the sensor is monitored at 460 nm while subjected to different concentrations of methyl orange (MO) solutions. The transmitted light intensity percent is proportional to the methyl orange concentration. This sensor shows&nbsp; a sensitivity of -37.2 and -37.9 dBm/ppm&nbsp; for the measurement of MO concentration in DI and Tehran tap water, respectively. This sensor offers easy fabrication, fast response, online monitoring, and proper linear response at low concentrations beside other advantages of fiber optic sensors.<span dir="RTL"></span></strong> Fiber optic sensor, Mach-Zehnder interferometric, Methyl orange dye, Water pollution Fiber optic sensor, Mach-Zehnder interferometric, Methyl orange dye, Water pollution 40 42 http://opsi.ir/browse.php?a_code=A-10-1972-15&slc_lang=fa&sid=1 Hamid Reza Solaimany Nazar Hamid Reza Solaimany Nazar 10031947532846009998 10031947532846009998 No Dept. of Electronics, Faculty of ECE, Tarbiat Modares University, Tehran, Iran Dept. of Electronics, Faculty of ECE, Tarbiat Modares University, Tehran, Iran Vahid Ahmadi Vahid Ahmadi 10031947532846009999 10031947532846009999 Yes Dept. of Electronics, Faculty of ECE, Tarbiat Modares University, Tehran, Iran Dept. of Electronics, Faculty of ECE, Tarbiat Modares University, Tehran, Iran Ali Reza Solaimany Nazar Ali Reza Solaimany Nazar 100319475328460010000 100319475328460010000 No Chemical Engineering Dept., Faculty of Engineering, University of Isfahan, Isfahan, Iran Chemical Engineering Dept., Faculty of Engineering, University of Isfahan, Isfahan, Iran