Title :
A low-cost, optical feedback laser range-finder with chirp-control
Author :
Bosch, T. ; Pavageau, S. ; Alessandro, D.D. ; Servag, N. ; Lodi, V. Annovazzi ; Donat, S.
Author_Institution :
ENSEEIHT, Toulouse, France
Abstract :
A new laser range finder using optical feedback interferometry and wavelength sweep has been developed. Our aim was to design a high-accuracy sensor for operation on short distances, using a low-cost Mach-Zender interferometer to separately measure the chirp of the laser. Experimentally, on a plain diffusing target, at a 10-cm distance, we were able to demonstrate an accuracy of 100 μm. Projected accuracy is down to 20-50 μm
Keywords :
Mach-Zehnder interferometers; chirp modulation; laser feedback; laser ranging; light interferometry; 10 cm; absolute distance measurement; chirp-control; high-accuracy sensor; laser rangefinder; low-cost Mach-Zender interferometer; optical feedback interferometry; plain diffusing target; pseudo-periodic signal; semiconductor laser; short distance operation; wavelength sweep; Chirp; Coherence; Frequency; Laser feedback; Optical feedback; Optical interferometry; Optical modulation; Optical sensors; Power lasers; Semiconductor lasers;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.928244
