08-16-2017, 10:32 PM
advantages of digital respiration rate meter
Introduction
Measurement of physiological parameters like heart rate and respiration rate is crucial in the field of medicine. Here is a simple method for respiration rate measurement using a displacement transducer. Its responds fast and is cost effective. By using this, respiration rate can be measured in the range of 0 to 999 respirations/ minute. Digital Respiration Rate Meter uses a displacement transducer for sensing the respiration rate using IR transmitter and receiver as shown in the physical assembly. Inhaling and exhaling the air during respiration causes a light ball to move up and down in a capillary glass tube. This movement is sensed with the help of an IR transmitter-receiver assembly of the sensing circuit and converted into pulses through the pulse generator. These pulses are counted for a minute using a counter. The respiration rate is displayed on a 3-digit display through the seven segment decoder/driver. Start switch S1 is used to reset the display to zero and enable the counter for a minute to count the respiration pulse. The gate pulse generator consists of a monostable multivibrator. When triggered by start switch, it generates gating pulse of one minute duration.