Design of an FPGA-based high-speed data acquisition system for frequency scanning interferometry long-range measurement

Sivanathan, Sivagunalan, Roula, Mohammed Ali, Li, Kang, Qiao, Dun and Copner, Nigel Joseph 2023. Design of an FPGA-based high-speed data acquisition system for frequency scanning interferometry long-range measurement. IEEE Open Journal of Instrumentation and Measurement 3 , 7000110. 10.1109/OJIM.2023.3347268

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Abstract

Frequency scanning interferometry (FSI) has become a popular method for long-range, targetbased, distance measurements. However, the cost of developing such systems, particularly the electronic components required for high-speed data acquisition (DAQ), remains a significant concern. In this article, we present a cost-effective, FPGA-based real-time DAQ system specifically designed for FSI, with a focus on long absolute distance measurements. Our design minimizes the use of third-party intellectual property (IP) and is fully compatible with the Xilinx FPGA 7 series families. The hardware employs a 160-MS/s, 16-bit dual-channel ADC interfaced to the FPGA via a low-voltage differential signaling (LVDS). The proposed system incorporates an external sampling clock, referred to as the K-clock, which linearizes the laser’s tuning rate, enabling optical measurements to be sampled at equal optical frequency intervals rather than equal time intervals. Additionally, we present the design of a high-speed, 160-MS/s ADC module for the front-end analog signal interface and the LVDS connection to the chosen FPGA. We demonstrate that the digitized data samples can be efficiently transmitted to a polarization controller (PC) application via a USB interface for further processing.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	2768-7236
Date of First Compliant Deposit:	18 June 2024
Date of Acceptance:	4 December 2023
Last Modified:	02 Jul 2024 10:15
URI:	https://orca.cardiff.ac.uk/id/eprint/169878

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