This light is captured by the detector to measure the blood stream, as can be observed in Figure 6. The working principle of the PPG sensor is based on the emission of infrared light by an LED which penetrates the skin and blood vessels. It also measures the amount of air left in your lungs after you exhale as much as you can. With a 10 V excitation voltage, the output signal will be 100 mV.īody plethysmography is a pulmonary (lung-related) function test that determines how much air is in your lungs after you take in a deep breath. In practice, most strain gauge bridges and strain-based transducers will output less than 10 mV/V (10 mV of output per volt of excitation voltage). Signal Amplification – The output of strain gauges and bridges is relatively small.
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