A synchronization controller based on FPGA for an underwater laser imaging system

LEI Xuan-hua; YANG Ke-cheng

doi:10.3969/j.issn.1001-3806.2010.O5.029

A synchronization controller based on field programmable gate array(FPGA) for an underwater laser imaging system was proposed to realize the synchronization of the pulsed laser and the intensified CCD (ICCD) and improve the image resolution.The controller, taking the advantages of FPGA's high compact and flexibility, uses the phase-locking-loop for the global clock frequency and the carry chain for delay cell so that the precision of pulse delay and pulse width gets up to a nanosecond level.Problems with the precision and stabilization induced by discrete components in conventional control circuits were solved. Experimental results indicate that synchronization controller is a feasible solution for gated imaging system working under tight time and visibility requirements of stability and real-time applications.

A synchronization controller based on FPGA for an underwater laser imaging system

Corresponding author: YANG Ke-cheng, kcyang@hust.edu.cn

1. Wuhan National Laboratory For Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

2. Department of Weaponry Engineering, Naval University of Engineering Wuhan 430033, China

Received Date: 2009-11-04

Accepted Date: 2009-12-25

Available Online: 2010-09-25

Abstract: A synchronization controller based on field programmable gate array(FPGA) for an underwater laser imaging system was proposed to realize the synchronization of the pulsed laser and the intensified CCD (ICCD) and improve the image resolution.The controller, taking the advantages of FPGA's high compact and flexibility, uses the phase-locking-loop for the global clock frequency and the carry chain for delay cell so that the precision of pulse delay and pulse width gets up to a nanosecond level.Problems with the precision and stabilization induced by discrete components in conventional control circuits were solved. Experimental results indicate that synchronization controller is a feasible solution for gated imaging system working under tight time and visibility requirements of stability and real-time applications.

HTML

Reference (9)

[1]	TAN Ch S,SEET G,SLUZEK A,et al.A novel application of range-gated underwater laser imaging system (ULIS) in near-target turbid medium[J].Optics and Lasers in Engineering,2005,43(9):995-1009.
[2]	McLEAN E A,BURRIS H R,Jr,STRAND M P.Short-pulse range-gated optical imaging in turbid water[J].Appl Opt,1995,34(21):4343-4351.
[3]	BUSCK J,HEISELBERG H.Gated viewing and high-accuracy three-dimensional laser radar[J].Appl Opt,2004,43(24):4705-4710.
[4]	CHEN M S,LI T S,HE Zh Y.Application research of range-gated technique in underwater laser imaging system[J].Chinese Journal of Lasers,2008,35(s1):197-203(in Chinese).
[5]	XU X W,GUO J,YU Q Y,et al.Key technique of laser range gated imaging[J].Laser Technology,2003,27(6):603-605(in Chinese).
[6]	SUN Zh H,DENG J H,YAN X W.Progress and current state of the development of laser imaging detection system and its key techniques[J].Science Technology Review,2008,26(3):74-79.
[7]	WU J,SHI Z.The 10ps wave union TDC:Improving FPGA TDC resolution beyond its cell delay[C]//Nuclear Science Symposium Conference Record.Dresden,Germany:IEEE,2008:3440-3446.
[8]	KALISZ J,SZPLET R,PONIECKI A.Field-programmable-gate-array-based time-to-digital converter with 200ps resolution[J].IEEE Trans Instrum Measurement,1997,46(1):51-55.
[9]	FAVI C,CHARBON E.A 17ps time-to-digital converter implemented in 65nm FPGA technology[C]//FPGA'09:Proceeding of the ACM/SIGDA International Symposium on Field Programmable Gate Arrays.Monterey,USA:Association for Computing Machinery,2009:113-120.

A synchronization controller based on FPGA for an underwater laser imaging system

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views