期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 70, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2020.3020682
关键词
Eye movement; field-programmable gate array (FPGA); oculography; oculomotor; scleral coil; search coil; vestibular
资金
- National Institute on Deafness and Other Communication Disorders [R01DC009255, R01DC002390, R01DC013536]
- NIDCD [R01DC014503, 2T32DC000023-31]
- MED-EL GmbH
This study presents a new magnetic coil system optimized for recording 3-D eye movements with high precision and accuracy in small animals. By utilizing an FPGA for digital demodulation, the system is able to provide real-time output at a high sampling rate, resulting in improved performance compared to older analog-based systems.
Vestibular and oculomotor research often requires measurement of 3-D eye orientation and movement with high spatial and temporal precision and accuracy. We describe the design, implementation, validation, and use of a new magnetic coil system optimized for recording 3-D eye movements using small scleral coils in animals. Like older systems, the system design uses off-the-shelf components to drive three mutually orthogonal alternating magnetic fields at different frequencies. The scleral coil voltage induced by those fields is decomposed into three signals, each related to the coil's orientation relative to the axis of one field component. Unlike older systems based on analog demodulation and filtering, this system uses a field-programmable gate array (FPGA) to oversample each induced scleral coil voltage (at 25 M samples/s), demodulate in the digital domain, and average over 25 k samples per data point to generate 1-k samples/s output in real time. Noise floor is <0.036 degrees peak-to-peak and linearity error is <0.1 degrees during 345 degrees rotations in all three dimensions. This FPGA-based design, which is both reprogrammable and freely available upon request, delivers sufficient performance to record eye movements at high spatial and temporal precision and accuracy using coils small enough for use with small animals.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据