Crosstalk analysis of 1 m to 10 m laser phase-shift range finder

Author

Bosch, Thierry ; Lescure, Marc

Author_Institution

Dept. Autom. et Productique, Ecole des Mines, Nantes, France

Volume

46

Issue

6

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

1224

Lastpage

1228

Abstract

A heterodyne phase-shift laser range finder has been developed for the measurement of distances of 1 m to 10 m. An analysis of the crosstalk between the current source and the photoelectric receiver of this device permits prediction of the accuracy of the setup. For example, when the amplitude of the crosstalk is proportional to the modulation frequency and for a given photoelectric signal-to-induction ratio of 30 at 10 m, the maximum corresponding error is about 5 cm. To determine the magnitude of the crosstalk, we propose a model taking into account that the amplitude and the phase-shift of the induced signal depend on whether the coupling is inductive or capacitive. Crosstalk modeling shows that very slight inductive or capacitive coupling is sufficient to affect distance measurement

Keywords

laser ranging; measurement errors; optical crosstalk; phase shifters; 1 to 10 m; CW laser; accuracy; capacitive coupling; crosstalk; crosstalk modeling; current source; distance measurement; error; heterodyne phase-shift laser range finder; induced signal; inductive coupling; measurement of distances; modulation frequency; phase-shift; photoelectric receiver; photoelectric signal-to-induction ratio; semiconductor laser; Circuits; Distance measurement; Frequency; Laser modes; Optical crosstalk; Optical interferometry; Optical mixing; Phase measurement; Pulse measurements; Semiconductor lasers;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.668256

Filename

668256