A Portable 16-channel Magnetic Sensor for Human Magnetocardiographic Experiments [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.45 Wind engines
• Thông tin xuất bản: Los Alamos, N.M. : Oak Ridge, Tenn. : Los Alamos National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2018
• Mô tả vật lý: Size: p. 54-57 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 261892
• Chủ đề: 1. 16-channel magnetic sensing; 2. 47 other instrumentation; 3. 60 applied life sciences; 4. Magnetically shield room; 5. Magnetocardiography; 6. Optically pumped magnetometer; 7. Portability

Tóm tắt

Here, 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 array, 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 surrounded by 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 the 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.