Abstract
This research discusses the polymer optical fiber sensor for respiratory measurements. The infrared LED that produces light will propagate along the polymer optical fiber which will be received by the phototransistor and the differential amplifier. The output voltage in the form of an analog signal will be converted to a digital signal by the Arduino Uno microcontroller and displayed on the computer. The polymer optical fiber sensor is installed on the corset using a variety of configuration (straight, sinusoidal, and spiral), placed in the abdomen, and a variety of positions (abdomen, chest, and back) using only a spiral configuration. While doing the inspiration, the stomach will be enlarged so that the optical fiber sensor will have strain. The strain will cause loss of power, the resulting light intensities received by the phototransistor are reduced, and the output voltage on the computer decreases. The result shows that the highest voltage amplitudes were in the spiral configuration placed in the abdominal position for slow respiration measurements with the highest range, sensitivity, and resolution which are 0.119 V, 0.238 V/s, and 0.004 s, respectively. The advantages of our work are emphasized on measurement system simplicity, low cost, easy fabrication, and handy operation and can be connected with the Arduino Uno microcontroller and computer.
Highlights
Respiration is a process of oxygen entering the lungs and reaching the body’s cells, as well as the processes that cause carbon dioxide out of the body through the nose and mouth
Core and cladding of polymer optical fibers are made from polymethyl methacrylate (PMMA) with a refractive index of the core and a refractive index of the cladding, each are ncore = 1:49 and ncladding = 1:402, with a numerical value of the polymer optical fiber which is NA = 0:5
The data obtained in the test is used to analyze sensor characterization which includes the calculation of output voltage range values, sensitivity, and resolution
Summary
Respiration is a process of oxygen entering the lungs and reaching the body’s cells, as well as the processes that cause carbon dioxide out of the body through the nose and mouth. Respiration has a frequency taken within a certain time; this level may vary depending on the oxygen requirement. Respiratory rate measurement is one of the important physiological parameter in the medical field. Respiration will provide the pertinent information about the condition of the human heart, nerves, and lungs [1,2,3]. Several methods of measuring the respiratory rate using sensor systems have been developed, using optical fiber [4]. The optical fiber can be applied as multipurpose sensors in various measurement fields with several advantages in terms of sensitivity, selectivity, reversibility, flexibility, accuracy, smaller size, and lightweight [5]
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