Extracting Biomedical Signals from High Noise Environments

Modern measurement systems must have the ability to perform measurements in high-level noise environments. The field with a particularly high content of noise is biomedicine. The traditional approach to solving this problem is to inject very high energy signals in order to minimize the impact of noise on the measurement (Magnetic resonance imaging, X-rays). Unfortunately, this means that these systems are very large, expensive, difficult to maintain and often contain toxic materials. This paper presents research aimed at finding a non-invasive method that uses low-intensity signals that are completely harmless to humans, and at the same time allows extracting the measured signal from a highly noised environment. Noise suppression was achieved with a lock-in amplifier.