engineering

Laser guidance

Laser guidance is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Laser guidance rather than just read about it. In short: Laser guidance directs a robotics system to a target position by means of a laser beam. The laser guidance of a robot is accomplished by projecting a laser light, image processing and communication to improve the accuracy of guidance.

Key takeaways

Laser guidance belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Laser guidance to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Laser guidance from memory before moving on to harder problems.

Reference excerpt

Laser guidance directs a robotics system to a target position by means of a laser beam. The laser guidance of a robot is accomplished by projecting a laser light, image processing and communication to improve the accuracy of guidance. The key idea is to show goal positions to the robot by laser light projection instead of communicating them numerically. This intuitive interface simplifies directing the robot while the visual feedback improves the positioning accuracy and allows for implicit localization. The guidance system may serve also as a mediator for cooperative multiple robots. Examples of proof-of-concept experiments of directing a robot by a laser pointer are shown on video. Laser guidance spans areas of robotics, computer vision, user interface, video games, communication and smart home technologies.

Commercial systems Samsung Electronics Co., Ltd. appears to have used this technology in its robotic vacuum cleaners since 2014 and registered the trademark "PointCleaning" (USPTO serial No. 86555014) in March 2015. Following the grant to Samsung of U.S. Patent No. 9,675,229 and its European counterpart, EP 2963515, both patents were challenged by Igor Paromtchik through an ex parte reexamination in the United States and opposition proceedings in Europe. The European patent was revoked in March 2024. The U.S. patent ceased to be in force in June 2025 due to non-payment of maintenance fees, approximately ten years before the end of its full statutory term. Google Inc. applied for a patent with USPTO on using visual light or laser beam between devices to represent connections and interactions between them (Appl. No. 13/659,493, Pub. No. 2014/0363168). However, no patent was granted to Google on this application.

Military use

Laser guidance is used by military to guide a missile or other projectile or vehicle to a target by means of a laser beam, either beam riding guidance or semi-active laser homing (SALH). With this technique, a laser is kept pointed at the target and the laser radiation bounces off the target and is scattered in all directions (this is known as "painting the target", or "laser painting"). The missile, bomb, etc. is launched or dropped somewhere near the target. When it is close enough for some of the reflected laser energy from the target to reach it, a laser seeker detects which direction this energy is coming from and adjusts the projectile trajectory towards the source. While the projectile is in the general area and the laser is kept aimed at the target, the projectile should be guided accurately to the target. Countermeasures to laser guidance are laser detection systems, smoke screen, and anti-laser active protection systems.

See also Guidance system Laser rangefinder List of laser articles List of laser applications Semi-active radar homing

References

Illustrations

Worked examples

Example 1 — a first encounter with Laser guidance

Start with the simplest possible case. Write down what Laser guidance claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Laser guidance before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Laser guidance ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Laser guidance

In research: Laser guidance appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Laser guidance in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Laser guidance is common in secondary-school and first-year university syllabi. It links to neighbouring topics Laser applications, Missile guidance, Robot navigation, so understanding it makes those chapters shorter.
In everyday life: Look for Laser guidance outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Laser guidance in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Laser guidance means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Laser guidance out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Laser guidance in simple terms?

Why does Laser guidance matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Laser guidance?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Laser guidance.