A Portable 16-Channel Magnetic Sensor For Human Magnetocardiographic Experiments
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 10
Abstract
We constructed a portable, low-cost 16-channel magnetic sensor for Magnetocardiography (MCG) applications. The sensor is based on a high-sensitivity optically pumped magnetometer (OPM) with a novel configuration of nearly parallel pump and probe laser beams. The OPM-based 16-channel magnetic sensing is realized in a single module by using a fairly large rubidium vapor cell, broad pump/probe laser beams, and a 16-channel photodiode matrix, leading projected 10-fold reduction of the cost of sensors. The portability of the sensor is achieved by coupling the pump and probe lasers to OPM optics through multi-mode optical fibers. The 16-channel magnetic sensor is covered with a non-magnetic enclosure for safe operation. For MCG experiments with the sensor, its main components except lasers are located inside a magnetically shielded room (MSR), which reduces ambient magnetic noise. The location of lasers and supporting electronics outside the MSR improves the sensitivity of the sensor. We report that the 16-channel magnetic sensor has a magnetic field sensitivity sufficient to directly detect the human cardiac magnetic signals.
Authors and Affiliations
Young Jin Kim, Igor Savukov
Keywords
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