Pulse Detector Through Difference Amplifier

Norwahidah, Mohd Noor (2006) Pulse Detector Through Difference Amplifier. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is about to develop a circuit which can detect the human pulse with the principal of correlation analysis or known as lock-in analysis. Human pulse signal which around 0.5 to I second with 20 μ V that can be detected through the photodiode. This detector can detect human pulse through difference amplifier. The blood pressure varying with the heartbeat changes the amount of blood in the peripheral blood vessel. This lead to an optically measurable alteration of skin reflectance and transmittance. An infrared LED is used to transmit and receive the signal from the pulse from a finger. Back scattered light is detected by a photodiode. Then, the high frequency noise from the measured signal is removed by a low-pass filter which build up with operational amplifiers. The principal of correlation analysis or known as ·Lock-in· analysis, is being used to extract signal buried in a noise.

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