Hardware implementation and comparison of displacement retrieval algorithms   for a laser diode-based optical feedback interferometric sensor

Ghazi REHMAN; Usman ZABIT; Muhammad Obaid ULLAH

Makale detayları

Hardware implementation and comparison of displacement retrieval algorithms for a laser diode-based optical feedback interferometric sensor

Yazarlar:

Ghazi REHMAN | Usman ZABIT | Muhammad Obaid ULLAH

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2018 Vol.26 Issue 4, pp.1820-1832

Belge Tipi:

Makale

Yayın Tarihi:

7/2018

Belge Dili:

Türkçe

Document ID (Org No.):

2000734911

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632

Özet:

 

Optical feedback interferometer (OFI) lasers, also called   self-mixing (SM) lasers, have been widely explored over the last couple of   decades due to their low cost, compactness, and self-aligned nature and they   provide a very good solution for measurements of displacement, vibration,   distance, velocity, etc. The SM effect takes place when a part of the laser   beam is fed back to the active laser cavity after reflecting from the   target. The reflected beam interferes with the emitted beam and hence the   optical and spectral characteristics of the laser get changed. To retrieve   the vibration or displacement signal of the target from the SM signal,   different postprocessing algorithms have been proposed, such as the phase   unwrapping method (PUM). The first step of the PUM leads to the coarse   estimation of the laser phase and the final step is an iterative joint   estimation of 2 parameters, namely laser coupling coefficient CCC and   linewidth enhancement factor αα\alpha . To make this algorithm applicable   for real-time measurements, parallel joint estimation for a wide range of   CCC and αα\alpha  values needs to be done. In this research, 3 algorithms,   namely PUM, direct fringe unwrapping (DFU), and improved DFU (IDFU) were   tested for FPGA implementation by using Verilog HDL (hardware description   language) so that more precise and real-time vibration and displacement   signals of targets could be extracted from the SM sensor in an embedded   systems environment. These algorithms were developed using Verilog HDL for   implementation on the Xilinx Spartan-3 Xcs400-FG320 development board. Our   designed IDFU algorithm performed 0.4920.4920.492\, times better than the parallel   PUM algorithm in maximum clock frequency and 1.531.531.53 and 1.211.211.21 times better   than the PUM in slice registers and LUT utilization of hardware resources,   respectively. The designed DFU algorithm can operate 1.3551.3551.355 times better   than IDFU in maximum clock frequency and 25.3425.3425.34 and 14.2514.2514.25 times better   than IDFU in slice registers and LUT utilization of hardware resources,   respectively.

Makale detayları

Hardware implementation and comparison of displacement retrieval algorithms for a laser diode-based optical feedback interferometric sensor

Yazarlar: Ghazi REHMAN | Usman ZABIT | Muhammad Obaid ULLAH

Yayıncı: TUBITAK

Dergi: Turkish Journal of Electrical Engineering and Computer Science 2018 Vol.26 Issue 4, pp.1820-1832

Belge Tipi: Makale

Yayın Tarihi: 7/2018

Belge Dili: Türkçe

Document ID (Org No.): 2000734911

Sıklık: İki Aylık

eISSN: 1303-6203

pISSN: 1300-0632

Sayı

Yazarlar:

Ghazi REHMAN | Usman ZABIT | Muhammad Obaid ULLAH

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2018 Vol.26 Issue 4, pp.1820-1832

Belge Tipi:

Makale

Yayın Tarihi:

7/2018

Belge Dili:

Türkçe

Document ID (Org No.):

2000734911

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632