Relative Humidity Sensing Using a PMMA Doped Agarose Gel Microfiber

Irawati, Ninik; Rahman, Husna Abdul; Yasin, Moh.; Al-Askari, Shadi; Hamida, Belal Ahmed; Ahmad, Harith; Harun, Sulaiman Wadi

doi:10.1109/jlt.2017.2698044

Cited by 53 publications

(18 citation statements)

References 20 publications

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“…Its sensitivity, linearity, and resolution are 0.5221 dBm/%RH, more than 99% and 0.4094%RH, respectively. In the same year, Irawati et al reported a high sensitivity RH sensor based on the PMMA microfiber doped agarose without any sensitive coating whose sensitivity, linearity and resolution are 0.421 dBm/%RH, more than 98% and 0.431%RH with RH in the range of 50% to 80%RH.…”

Section: Measurement Methodsmentioning

confidence: 99%

“…Interferometer–based humidity sensors have a high sensitivity and more flexible structure to make it more suitable for practical application. To enhance the sensitivity of humidity sensors, a lot of methods of functionalization have been proposed, such as doped humidity sensitive materials, deposition of functionalized coatings, special structures, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Research Advances in Microfiber Humidity Sensors

Peng

Zhao

Chen

et al. 2018

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An overview of the numerous latest research in microfiber humidity sensors is carried out with a specific focus on measurement methods, humidity sensitive materials, probe structures, and sensing properties of different sensors. First, five mainstream measurement structures, including taper, fiber grating, coupler, resonator, and interferometer are reviewed. It is concluded that these measurement structures sense the physicochemical property variations of microfibers or sensitive films and exhibit the change of optical signal when exposed to environment. Second, the basic preparation methods, humidity‐sensing properties, and their advantages and disadvantages as humidity sensitive material are addressed. Then, the advantages and disadvantages of all the above sensing structures are also discussed and compared. Finally, the main existing problems and potential solutions of microfiber humidity sensors are pointed out.

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Section: Measurement Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research Advances in Microfiber Humidity Sensors

Peng

Zhao

Chen

et al. 2018

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“…Irawati et al [ 55 ] proposed an optical humidity sensor based on the polymethyl methacrylate (PMMA) microfiber-doped agarose. The doping of agarose gel is enabled by the use of PMMA.…”

Section: Humidity Sensorsmentioning

confidence: 99%

Survey of Saliva Components and Virus Sensors for Prevention of COVID-19 and Infectious Diseases

et al. 2020

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The United States Centers for Disease Control and Prevention considers saliva contact the lead transmission mean of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which causes the coronavirus disease 2019 (COVID-19). Saliva droplets or aerosols expelled by sneezing, coughing, breathing, and talking may carry this virus. People in close distance may be exposed directly to these droplets or indirectly when touching the droplets that fall on surrounding surfaces and ending up contracting COVID-19 after touching the mucosa tissue of their faces. It is of great interest to quickly and effectively detect the presence of SARS-CoV-2 in an environment, but the existing methods only work in laboratory settings, to the best of our knowledge. However, it may be possible to detect the presence of saliva in the environment and proceed with prevention measures. However, detecting saliva itself has not been documented in the literature. On the other hand, many sensors that detect different organic components in saliva to monitor a person’s health and diagnose different diseases, ranging from diabetes to dental health, have been proposed and they may be used to detect the presence of saliva. This paper surveys sensors that detect organic and inorganic components of human saliva. Humidity sensors are also considered in the detection of saliva because a large portion of saliva is water. Moreover, sensors that detect infectious viruses are also included as they may also be embedded into saliva sensors for a confirmation of the presence of the virus. A classification of sensors by their working principles and the substances they detect is presented, including the sensors’ specifications, sample size, and sensitivity. Indications of which sensors are portable and suitable for field application are presented. This paper also discusses future research and challenges that must be resolved to realize practical saliva sensors. Such sensors may help minimize the spread of not only COVID-19 but also other infectious diseases.

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“…To estimate the detection resolution, we use a commonly accepted criterion that shifts of 1/100 of the linewidth can be detected with an adequate signal-to-noise ratio [31,[33][34][35], and obtain the resolution of our sensor to be 0.16% RH, which is better than typical microfiber [9,31,[36][37][38][39] or metallic nanoparticle [40,41] based humidity sensors.…”

Section: Single-cavity-based Optical Rh Sensormentioning

confidence: 99%