Papadimitriou Konstantinos I, Dempsey Laura A, Hebden Jeremy C, Arridge Simon R, Powell Samuel
Department of Computer Science, University College London, WC1E 6BT, London, UK.
Department of Medical Physics and Biomedical Engineering, University College London, WC1E 6BT, London, UK.
Biomed Opt Express. 2018 May 10;9(6):2648-2663. doi: 10.1364/BOE.9.002648. eCollection 2018 Jun 1.
We introduce a compact time-domain system for near-infrared spectroscopy using a spread spectrum technique. The proof-of-concept single channel instrument utilises a low-cost commercially available optical transceiver module as a light source, controlled by a Kintex 7 field programmable gate array (FPGA). The FPGA modulates the optical transceiver with maximum-length sequences at line rates up to 10Gb/s, allowing us to achieve an instrument response function with full width at half maximum under 600ps. The instrument is characterised through a set of detailed phantom measurements as well as proof-of-concept measurements, demonstrating performance comparable with conventional pulsed time-domain near-infrared spectroscopy systems.
我们介绍了一种采用扩频技术的紧凑型近红外光谱时域系统。该概念验证单通道仪器利用一个低成本的商用光收发模块作为光源，由Kintex 7现场可编程门阵列（FPGA）控制。FPGA以高达10Gb/s的线速率用最大长度序列调制光收发器，使我们能够实现半高全宽低于600ps的仪器响应函数。该仪器通过一组详细的仿体测量以及概念验证测量进行表征，其性能与传统脉冲时域近红外光谱系统相当。
