Humidity control of an incubator using the microcontroller-based active humidifier system employing an ultrasonic nebulizer

Department of Electronics and Computer Education, Faculty of Technical Education, Gazi University, Ankara, Turkey.
Journal of Medical Engineering & Technology 01/2002; 26(2):82-8. DOI: 10.1080/03091900110115478
Source: PubMed


Relative humidity levels of an incubator were measured and controlled. An ultrasonic nebulizer system as an active humidifier was used to humidify the incubator environment. An integrated circuit-type humidity sensor was used to measure the humidity level of the incubator environment. Measurement and control processes were achieved by a PIC microcontroller. The high-performance and high-speed PIC provided the flexibility of the system. The developed system can be used effectively for the intensive care of newborns and/or premature babies. Since the humidifier generates an aerosol in ambient conditions, it is possible to provide the high relative humidity level for therapeutic and diagnostic purposes in medicine.

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Available from: Inan Guler, Aug 28, 2014
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    • "In 1891 reports came of a new incubator design in France, designed by Alexander Lion of Nice. In early 21st century the incubator has become highly technological and improved.[3] Today developments are still constantly underway to try and create an ever more womb-like environment; controlling oxygen levels and other vital systems, with an array of sensors, monitors and alarms [4]. "
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    ABSTRACT: According to the World Health Organization (WHO), an estimated 15 million infants worldwide are born preterm every year; 4 million infants die within a month of birth. 25% of these deaths are caused due to complications of prematurity, most often due to improper heat regulation, water loss and neonatal jaundice and due to other complications that could be avoided by use of simple interventions, such as keeping the infant warm for the first several weeks of life. An infant incubator provides stable levels of temperature, relative humidity and oxygen concentration. Temperature control system is the most important part of a baby incubator which has to be maintained around 37 o C. This paper focuses on the comparison of temperature control between advanced temperature control system and microcontroller based control system. The advanced temperature control system has been designed and developed incorporating a combination of Pulse Width Modulation (PWM) and simple ON-OFF control system, where thermistors have been used as temperature sensors. The range of variation of temperature against the set temperature (37 o C) has been found to be 2 o C. The system components of the microcontroller based control system includes DHT11 temperature sensor, relay, LCD display, fans, bulbs, heater and Arduino Uno microcontroller. For implementation, a software program has been developed in language C. It can control the temperature at the set level 37 o C very precisely with negligible temperature swing. At the same time it is cost effective, free of health hazard. It can be used commercially in the hospitals, at home and can be further modified in the laboratory.
    3rd International Conference on Mechanical Industrial & Energy Engineering(ICMIEE), Khulna, Bangladesh; 12/2014
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    • "But temperature control alone is not sufficient to provide comfortable environment. Therefore, the relative humidity control is also very important to reduce the newborn heat loss [1] [2] [3]. Many authors [4] [5] [6] [7] observed a 40% reduction in evaporative losses when the relative humidity increases from 20 to 60%. "
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    ABSTRACT: This paper introduces theoretical modelling working on the thermal behavior of the premature infant. This study aims at developing a model useful for the prediction and design of the appropriate controller in objective to reduce evaporative heat loss. A calculation code has been developed to simulate the thermal response of a premature baby to climatic solicitation inside the incubator system. The model allows us to take into consideration radiative, conductive, convective, and evaporative heat transfers inside the incubator system. The air temperature and the humidity rate, which play a salient part in the convective and evaporative exchanges, are calculated by a coupled transfer function. At present, the environmental conditions (temperature and humidity) inside incubator are controlled with a classical Proportional Integral Differential (PID). In this work, we proposed a decoupling Generalized Predictive Controller (DGPC) based on the model described below to achieve an optimal thermal conditions (36.5–37.5) for immature newborn infants (birthweight <1000 grams). Real and simulations results prove the feasibility and effectiveness of the proposed model and controller.
    IRBM 09/2014; 35(4). DOI:10.1016/j.irbm.2014.07.001 · 0.52 Impact Factor
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    • "But this method cannot provide a high humidity level at low temperature such as in the range of 23-38 degree. As a result, the passive method is not suitable to humidify the limited volume of an environment such as an incubator [4]. In this work, we recovered an incubator from Maternal and Neonatal Unit of Rabta-Tunisia. "
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    ABSTRACT: In this work we have developed a new humidifier system based on ultrasonic nebulizer, that's used to control the relative humidity inside the incubator. Real time humidity data was collected using high sensitive sensor SY-230. The humidity dynamic properties of neonatal incubator were evaluated. System identification result is based on genetic algorithm and least squares algorithm (RLS) to find the NARMA input-output mathematical model. For this object, we have achieved and implemented an acquisition chain based on a PIC micro- controller. At the command, a comparative study was made between Proportional Integral Derivative (PID) controller and Model Based Predictive Control (MPC) witch parameters of PID and the cost function of (MPC) were optimized using Genetic Algorithm (GA). The environment for the development of different algorithms is the MATLAB 7.X software.
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