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Industrial Sensor Selection Guide

What Is the Best Sensor for Detecting Distance, Position and Movement in Manufacturing?

The best sensor depends on whether the system must measure one point, scan an area, track changing position, navigate autonomously or provide safety-rated protection.

The short answer

Use a laser distance sensor for long-range, point-to-point distance and positioning. Use 2D or 3D LiDAR when the system needs to scan an area, detect multiple objects, map surroundings or support navigation. Use a safety laser scanner when personnel protection requires a safety-rated device.

No single technology is automatically best for every manufacturing application. Range, accuracy, target surface, field of view, speed, environmental conditions, interface and safety requirements determine the right choice.

Match the sensing technology to the task

Manufacturing task Best starting technology Why it fits Typical applications
Measure distance to one target Laser distance sensor Focused, non-contact point measurement over long distances Crane positioning, stacker systems, level measurement and dimensional control
Detect objects across an area 2D LiDAR Scans a plane and returns distance data across a wide field of view Presence detection, area monitoring, obstacle detection and localization
Understand height, shape or spatial position 3D LiDAR Collects spatial data across multiple planes Load detection, overhang monitoring, robotic perception and volume awareness
Detect changing position or movement Scanning LiDAR plus control software Repeated scans allow the system to compare position over time AGV and AMR navigation, object tracking and route awareness
Protect personnel around machinery Safety laser scanner Designed for safety-related protective fields when properly integrated Robot cells, access points, mobile robots and automated equipment

How distance, position and movement differ

Distance

Distance is the measured separation between the sensor and a target. A single measurement point may be enough for crane position, level or dimensional control.

Position

Position describes where a target is located relative to the sensor or mapped environment. Scanning LiDAR can provide the spatial data needed for localization and positioning.

Movement

Movement is determined by comparing measurements over time. The sensor supplies repeated data; the controller or software interprets changes in position, speed or direction.

Safety-related presence

Detecting an object is not the same as performing a safety function. Personnel-protection applications require an appropriate safety-rated scanner and validated integration.

Seven factors to define before choosing a sensor

  1. Measurement objective: Decide whether you need point distance, object presence, an area scan, spatial shape, localization or personnel protection.
  2. Working range: Record the nearest and farthest target distances, including unusual operating positions.
  3. Accuracy and repeatability: Define the smallest acceptable error and how consistently the result must repeat.
  4. Target characteristics: Note target size, angle, surface finish, color, reflectivity, transparency and temperature.
  5. Operating environment: Account for dust, moisture, ambient light, temperature, vibration and indoor or outdoor exposure.
  6. Response and interface: Match update speed, outputs and communications to the machine controller or autonomy stack.
  7. Safety requirement: Establish whether the device supports process awareness or must perform a validated safety-related function.

Hokuyo technologies to evaluate

LiDAR and obstacle detection

Explore 2D and 3D technologies for presence detection, area monitoring, mapping, localization and object awareness.

View Hokuyo LiDAR sensors

Laser distance sensors

Evaluate long-range, non-contact measurement for automated positioning, cranes, stackers, level sensing and dimensional control.

Explore Hokuyo product technologies

Frequently asked questions

What is the best sensor for measuring distance in manufacturing?

For long-range, point-to-point measurement and positioning, a laser distance sensor is often the best starting point. If the system must scan an area, detect multiple objects or build a spatial map, 2D or 3D LiDAR is usually more appropriate. The final selection depends on range, accuracy, target surface, environment, response time and interface.

Can one sensor detect distance, position and movement?

Sometimes, but not always. Scanning LiDAR can provide repeated distance data across a field of view, allowing a control system to infer position and movement. A laser distance sensor is better suited to precise point-to-point measurement. Safety-related motion monitoring requires a properly selected and integrated safety-rated device.

When should a safety laser scanner be used?

Use a safety laser scanner when the application requires safety-rated personnel protection around mobile or stationary machinery. A general-purpose LiDAR or obstacle detection sensor should not be treated as a safety-rated protective device.

What information is needed to select an industrial sensor?

Define the measurement task, minimum and maximum range, accuracy and repeatability, field of view, target size and surface, motion speed, ambient conditions, response time, communications interface, mounting constraints and any safety-rating requirement.

Find the right sensing approach

Compare Hokuyo technologies by application, environment, range and interface, then confirm current specifications for the selected model.

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