Analysis and Design of Algorithms for the Pulmonary Function Test

Avani Kalathiya; Ghanshyam D. Parmar

CALL FOR PAPERS : Mar-2023

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25-Mar-23

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Analysis and Design of Algorithms for the Pulmonary Function Test

Author(s):

Avani Kalathiya , Government Engineering College, Sector-28, Gandhinagar; Ghanshyam D. Parmar, Government Engineering College, Sector-28,Gandhinagar.

Keywords:

IR Transmitter-Receiver, LED, Differential Pressure Sensor, Atmega8, Flow Rate, Volume, Bias

Abstract:

Spirometer measures the amount of volume and flow rate of air that is inhaled & exhaled. Spirometer is a noninvasive diagnostic instrument. [1][2] This paper represents the comparison of three different spirometer sensor designs. 1st design of spirometer sensor is made up with using Infra Red Transmitter – Receiver. 2nd design is made up by using LED (Light Emitting Diode) – LDR (Light dependent resistor) pair as visible light Transmitter – Receiver. 3rd design uses differential pressure sensor which senses difference in air flow pressure. This differential pressure sensor is used for the further processing. The microcontroller, MAX232, and USB to 232 converters are used to display the output of sensor. MATLAB display the real time graph of spirometer. Flow rate and volume of the air flow are calculated in MATLAB software. Then bias removal algorithm has being applied to reduce the bias seen in the flow graph. Also expiration and inspiration graph has been separated from the complete flow graph. Parameters such as tidal volume, inspiratory volume, FEV1 and FVC can be calculated from this flow rate and volume graph. This paper also provides these parameter values of the persons of different age also.