A simple and reliable counting and display circuit for laser rangefinder

Khaled Gasmi*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


A digital counting and display circuit for long distance laser rangefinder is presented. The laser rangefinder uses a pulsed Nd:YAG laser emitting in the near-infrared spectral region at the wavelength of 1.06 μm to measure distances to targets with a resolution of 5 m, an accuracy of ±1.5 m, and a maximum range of 15 km based on a direct time-of-flight method. The detection is achieved with a probability of detection of 0.99 and a probability of false alarm of 1.5×10-7. The digital circuit is characterized by its simplicity, versatility and reliability. It is placed at the end of an optoelectronic detection chain formed by a silicon avalanche photodiode, a low-noise and fast multistage amplifier, and a fast analog-to-digital converter.

Original languageEnglish
Title of host publicationOptical Sensors 2021
EditorsFrancesco Baldini, Jiri Homola, Robert A. Lieberman
ISBN (Electronic)9781510643789
StatePublished - 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Bibliographical note

Publisher Copyright:
© 2021 SPIE.


  • Avalanche photodiode
  • Counting
  • Display
  • Laser
  • Range finder
  • Time-of-flight

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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