How does a laser rangefinder work?

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Discussion Overview

The discussion revolves around the working principles of laser rangefinders, also known as distance meters. Participants seek detailed explanations of the physics and electronics involved, including signal processing and the components that make up these devices.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests a comprehensive understanding of laser rangefinders, expressing dissatisfaction with superficial explanations that only mention the basic principle of measuring distance using light pulses.
  • Another participant suggests considering the precision of the internal clock needed for accurate measurements, hinting at the technical complexities involved.
  • A third participant provides links to external resources, including a Wikipedia page and a technical document, as potential sources of information.
  • One participant questions the feasibility of expecting a complete instruction guide with circuit diagrams, emphasizing that the forum is not a teaching institution.
  • Another participant outlines the basic components of a laser rangefinder, including a light generator, a light sensor, and a timing mechanism.
  • Some participants express frustration with perceived unhelpful responses, suggesting a lack of effort from the original poster and questioning the quality of engagement in the thread.

Areas of Agreement / Disagreement

There is no consensus on the level of detail or type of information that should be provided. Some participants feel that the original poster should conduct more research independently, while others are willing to share resources. Disagreement exists regarding the appropriateness of the responses given to the original inquiry.

Contextual Notes

Participants express varying expectations regarding the depth of information available in the forum, with some seeking detailed technical guidance and others emphasizing self-directed learning. The discussion reflects differing opinions on the nature of assistance that should be provided in a forum setting.

DariusP
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Summary: Laser rangefinder (distance meter) working principle

Hello, could anyone explain to me (or direct to) how a laser rangefinder/distance meter works?

I want to learn about it in as much detail as possible. All I could find so far were very premature explanations telling me that a laser shoots a light pulse and knowing the speed of light is able to calculate the distance.

I want more information and I want it to be as much in-depth as possible (physics and electronics behind it (+ how the electronics themselves work), how the signal is processed, etc).

If you ever saw and remember where I could find useful information then please direct me to it (or maybe you have a good understanding and could explain it here).
 
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DariusP said:
Summary: Laser rangefinder (distance meter) working principle

Hello, could anyone explain to me (or direct to) how a laser rangefinder/distance meter works?

I want to learn about it in as much detail as possible. All I could find so far were very premature explanations telling me that a laser shoots a light pulse and knowing the speed of light is able to calculate the distance.

I want more information and I want it to be as much in-depth as possible (physics and electronics behind it (+ how the electronics themselves work), how the signal is processed, etc).

If you ever saw and remember where I could find useful information then please direct me to it (or maybe you have a good understanding and could explain it here).

Google is your friend, although you are asking rather technical questions- for example, how to reject off-target reflections/scattering. How about if you start by figuring out how precise the internal clock needs to be to obtain a measurement accuracy of 0.1m?

https://precisionrifleblog.com/2013/10/29/how-do-rangefinders-work/
 
DariusP said:
Summary: Laser rangefinder (distance meter) working principle

I want more information and I want it to be as much in-depth as possible
You want a complete instruction guide plus circuit diagrams and construction details? Is that a realistic expectation? PF is a discussion forum and not a teaching institution.
If you read around about the problem and have some specific questions arising from your research you will find PF a valuable source of specific help and advice.
 
Ok, I will ask a simpler question then: does anyone know what parts constitute a laser distance meter/rangefinder?

I can probably try and deduce how each part works by myself.
 
If you had read the first paragraph or two in either of the references provided, you would already know the answers:

A piece which generates light.
A piece which senses light.
A piece which measures the time between the one and the other.
 
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@jbriggs444 I had to smile.
I wonder if the website Howthingswork could help here.
 
I don't know what's up with these useless replies... not the first time too. Maybe people here are already stuck in post count addiction? Anyway - if anyone will ever come around this thread, feel free to visit this link I found:
http://www.ti.com/lit/ug/sbau305a/sbau305a.pdf
I'm sure you'll find something useful there
 
DariusP said:
I don't know what's up with these useless replies... not the first time too. Maybe people here are already stuck in post count addiction?
We try to help folks learn how to learn, not just spoonfeed them answers. Honestly, you showed so little effort of your own in this thread. Right up to posting that good link in your final post in this thread.

Thread is closed.
 
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