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    Figure 9.   Low humidity level test of the developed  system.

    Figure 8. Performance test results of the developed system. Figure 10. Middle humidity level test of the developed system.

       

     

         

    Figure 11.   High humidity level test of the developed  system.

    environment. However, the developed system can easily cope within these circumstances. Because the  humidify- ing method is an active method, humidity is indepen- dently produced from the temperature of the incubator chamber.论文网

    Conclusions

    In this study, the humidity measurement and control system has been developed to control the humidity level of the incubator environment.  Since  the  humidifier is an active humidifier, high humidity levels are easily provided even at an ambient condition. In addition to these, temperature is one of the control parameters not affected by the humidifying processes. The IC-type humidity sensor is used in the humidity measurement circuit. Since the linearity of the sensor is better, accuracy is higher, the response time is faster than the other humidity sensor, and the RH of the incubator environment is controlled with small fluctuations around the control values. Since, measurement and control processes are achieved by the high-performance and high-speed PIC microcontroller, it is possible to provide  better performance to  control.

    1. POOLE, D.R., 1997, Challenges in the design of transport incubators. Biomedical Instrumentation and  Technology, March – April, 137 – 139.

    2. GATTS, J., WINCHESTER, S. and FISKE, K., 1992, The safety of partial intrauterine analog transition environment. Neona- tal Intensive Care, 5, 51 – 57.

    3. BOUATTOU RA, D., VILLON, P. and FARGES, G., 1998, Dynamic programming approach for newborn’s incubator humidity control. IEEE Transactions on Biomedical Engineering, 45, 48 – 49.

    4. DOEBELIN, E. O., 1990, Measurement Systems Application and Design (New York: McGraw-Hill), pp. 68, 340, 725 – 726, 769.

    5. BOYLE, H. B., 1992, Transducer Handbook (Oxford: Butter- worth-Heinemann), 175 – 177.

    6. HONEYWELL, 2000, Micro-Switch Sensing and Control, 99 –   100.

    7. HARDY, B., 1998, Its-90 formulation for vapor pressure, frostpoint temperature, dewpoint temperature and en- hancement factors in the range 7 1008C to +1008C. In Proceedings of the Third International Symposium on Humidity and  Moisture,  Teddington  (London, UK).

    8. KENDRICK, A. H., SMITH, E. C. and WILSON, R. S. E., 1997, Selecting and using nebulizer equipment. Thorax, 52 (suppl. 2) 92 – 101.

    9. POTT, P. J., 1987, Handbook of Silicate Rock  Analysis: Inductively Coupled Plasma-Mass Spectrometry (Glasgow: Black- ie),  pp.  575 – 586.

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    Chest, 99, 156S – 160S.

    11. KNOCH, M., 1999, Potentials to  improve  nebulizer  systems for solutions and suspensions. In 12th International Congress, Satellite Meeting on Mucus, Cilia, and Mucociliary Interactions (Vienna,  Austria),  12 – 16  June.

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