Implement an adjustable delay time digital trigger for an NI data acquisition card in a high-speed demodulation system

Hongtao Zhang; Lingling Fan; Pengfei Wang; Seong-Wook Park

doi:10.1117/12.918727

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4 May 2012 Implement an adjustable delay time digital trigger for an NI data acquisition card in a high-speed demodulation system

Hongtao Zhang, Lingling Fan, Pengfei Wang, Seong-Wook Park

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Proceedings Volume 8370, Fiber Optic Sensors and Applications IX; 83700V (2012) https://doi.org/10.1117/12.918727
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

A National Instruments (NI) DAQ card PCI 5105 is installed in a high-speed demodulation system based on Fiber Fabry-Pérot Tunable Filter. The instability of the spectra of Fiber Bragg Grating sensors caused by intrinsic drifts of FFP-TF needs an appropriate, flexible trigger. However, the driver of the DAQ card in the current development environment does not provide the functions of analog trigger but digital trigger type. Moreover, the high level of the trigger signal from the tuning voltage of FFP-TF is larger than the maximum input overload voltage of PCI 5105 card. To resolve this incompatibility, a novel converter to change an analog trigger signal into a digital trigger signal has been reported previously. However, the obvious delay time between input and output signals limits the function of demodulation system. Accordingly, we report an improved low-cost, small-size converter with an adjustable delay time. This new scheme can decline the delay time to or close to zero when the frequency of trigger signal is less than 3,000 Hz. This method might be employed to resolve similar problems or to be applied in semiconductor integrated circuits.

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Hongtao Zhang, Lingling Fan, Pengfei Wang, and Seong-Wook Park "Implement an adjustable delay time digital trigger for an NI data acquisition card in a high-speed demodulation system", Proc. SPIE 8370, Fiber Optic Sensors and Applications IX, 83700V (4 May 2012); https://doi.org/10.1117/12.918727

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