American Journal of Applied Sciences

Low-Noise High-Accuracy TOF Laser Range Finder

Shahram Mohammad Nejad and Saeed Olyaee

DOI : 10.3844/ajassp.2008.755.762

American Journal of Applied Sciences

Volume 5, Issue 7

Pages 755-762


This paper presents a new low-noise high-accuracy laser range finder based on the Time-Of-Flight (TOF) method. A Q-switched Nd:YAG laser at 1064 nm as a source and a SLIK avalanche photodiode as a detector are used. The optical section of the system including ZnS/MgF2 optical filter, designed by C++ and Zemax software, has been successfully implemented and tested. The quality factor of the optical filter is obtained about 2.53. Using the 1.5 MW Nd:YAG laser, the lowest detectable optical power is limited to about 8.14 nW. The absolute range finding error in the range of 0.3-20 km is also measured as δr= ± 50 cm. Furthermore, the sampling rate of the distance measurement can be adjusted between 1 and 20 samples per second.


© 2008 Shahram Mohammad Nejad and Saeed Olyaee. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.