Error analysis of phase-shift laser rangefinder with high-level signal

The amplitude of the photoelectric current delivered by the photodiode of a 1–10 m phase-shift laser rangefinder varies by a factor greater than 1000. With high levels, amplitude distortion generates a phase-shift error in mixing circuits. A model is proposed to analyse this error. It demonstrates t...

Full description

Saved in:
Bibliographic Details
Published in:Sensors and actuators. A. Physical. 1997-07, Vol.62 (1), p.534-538
Main Authors: Perchet, G., Lescure, M., Bosch, T.
Format: Article
Language:English
Subjects:
Error analysis
High-level signals
Laser rangefinders
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The amplitude of the photoelectric current delivered by the photodiode of a 1–10 m phase-shift laser rangefinder varies by a factor greater than 1000. With high levels, amplitude distortion generates a phase-shift error in mixing circuits. A model is proposed to analyse this error. It demonstrates that such an error can be suppressed with a clipper differential circuit, the load impedances of which are compensated, and by generating the harmonics of a useful signal on the local oscillator with a differentiated square wave. Theoretically, an improvement of more than 30 times may be achieved with a phase-shift error less than 0.1 degree for a 20 MHz frequency. Experimentation at 10 MHz shows that the new circuit is implementable and strongly reduces the error introduced by the usual one.
ISSN:0924-4247
1873-3069
DOI:10.1016/S0924-4247(97)01544-6