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Investigation of a PID-Based Dynamic Illuminance Control System for Intelligent Neonatal Jaundice Phototherapy Using

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Continuous monitoring during phototherapy is crucial for newborns with neonatal jaundice (NNJ). This study developed an adjustable, three-dimensional blue LED system for precise light intensity control, enhancing treatment safety and efficacy.

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Area of Science:

  • Neonatal Medicine
  • Biomedical Engineering
  • Phototherapy Technology

Background:

  • Newborns require continuous monitoring during phototherapy due to limited communication and physiological immaturity.
  • Neonatal jaundice (NNJ) is effectively treated with light-emitting diode (LED) phototherapy.
  • Precise control of light intensity is essential for safe and effective NNJ phototherapy.

Purpose of the Study:

  • To develop and evaluate a novel three-dimensional blue LED phototherapy system for NNJ treatment.
  • To enable precise, adjustable control of light intensity and output for enhanced therapeutic precision.
  • To extend previous research on indirect light intensity measurement for improved newborn monitoring.

Main Methods:

  • Utilized an Arduino Mega 2560 microcontroller with pulse-width modulation (PWM) for independent LED intensity regulation.
  • Designed an adjustable, arc-shaped structure mounting blue LED strips for mechanical and electronic adjustment.
  • Employed computer simulations and PID control algorithms for stable output contour achievement and dynamic duty cycle adjustment.

Main Results:

  • Blue LEDs emitting light at 460 ± 10 nm were confirmed to align with bilirubin's peak absorption spectrum, optimizing phototherapy efficacy.
  • Observed absorption peaks fell within the therapeutically effective range for NNJ treatment.
  • Experimental data demonstrated largely linear LED radiation output, supporting linear control algorithms.

Conclusions:

  • The developed three-dimensional blue LED system offers precise control over phototherapy parameters for NNJ.
  • The system's linear output and dynamic adjustability confirm its feasibility for advanced research and clinical application.
  • This technology enhances the safety and efficacy of phototherapy for neonatal jaundice.