Laser sensors
Laser sensors reliably detect even small objects of various material types over large distances. Due to the small light spot, they are able to work very precisely at a long range. Laser distance sensors are ideally suited for detecting the presence of objects and measuring distances. Read more here
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Laser distance sensors: precise distance measurement down to the millimetre
Laser sensors are among the most advanced measuring devices in optical sensor technology and set new standards for precision and reliability. Compared with conventional optical sensors such as infrared or red-light sensors, laser sensors offer significantly higher measurement accuracy - even over long distances. The focused, coherent laser beam enables precise distance measurement and reliable detection of even the smallest or most difficult objects, which often present a challenge for other types of sensor.
Advantages of laser sensors:
- Reliable operation even under changing lighting conditions (e.g. daylight, artificial light, darkness)
- Precise measurement on dark or differently reflective surfaces
- Thanks to the small light spot diameter, particularly accurate detection and reliable recognition of even the smallest objects/edges, even at greater distances
- Integrated control for demand-based switching the laser on/off (e.g. with AL001, AL013, AL014) - lowers energy consumption and reduces operating costs
How laser sensors work and their properties
Laser distance sensors operate on the basis of the time-of-flight principle (TOF), which measures the time taken by an emitted laser beam to reach an object and return from it. These sensors consist of a transmitter that emits laser light and a receiver that captures the reflected light. The distance to the object is calculated by multiplying the speed of light by the measured time and dividing by two. The sensor then calculates the distance from this time or phase information - a method that is particularly suitable for stable distance measurements and greater measuring distances.
Time-of-flight (ToF):
- Transit time (or phase shift) of the light
- For stable measurements over longer distances
Laser sensors in practical use
Conveyor technology
In conveyor technology, laser distance sensors are used to monitor the position and distance of goods on conveyor belts. They enable precise control of conveyor speed and the sorting of goods. The sensors must meet high requirements in terms of accuracy and response speed in order to ensure smooth operation. One example is a car manufacturer that uses laser sensors to monitor material flow in production in order to avoid bottlenecks.
Packaging industry
In the packaging industry, laser distance sensors are used to measure the height and width of products before packaging. This ensures optimum product comparison and efficient use of packaging material. The sensors must be capable of carrying out precise measurements even in darkness and under varying lighting conditions. One example is a company that packages food products and has integrated the sensors for quality control to ensure that the products meet the requirements.
Robotics
In robotics, laser distance sensors are used to detect obstacles and control movements precisely. These sensors enable robots to navigate in dynamic environments. The key technical requirements for the sensors are high measurement accuracy and short response times. One example is a logistics company that uses autonomous robots for warehouse management, which can safely navigate between shelves and pick up goods efficiently with the help of laser sensors.
Types of laser sensors at autosen: an overview
| Sensor type | Laser diffuse reflective sensor | Laser retro-reflective sensor | Laser through-beam sensor |
|---|---|---|---|
| Operating principle | Detects objects that interrupt the laser beam | Transmitter and receiver in the same housing, light is reflected back by the reflector | Separate transmitter and receiver, detection by interruption of the laser beam over long distances |
| Typical areas of application | Presence detection, manufacturing processes | Space-saving installations, conveyor technology | Long ranges, harsh environments |
| Particular strengths | Detects even very small or dark objects | Easy installation, for limited installation space | High reliability, detects over long distances |
| Find out more | About the measuring principle > | About the measuring principle > | About the measuring principle > |
Frequently asked questions (FAQ) about laser sensors
A laser sensor measures the distance by emitting a laser beam and determining the time the beam takes to return to the sensor. This method is precise and is frequently used in industry for distance measurement, for example in automated warehouses.
Yes, laser sensors are generally safe as long as the relevant safety guidelines are observed. Most devices operate with a laser class that is considered harmless. At autosen, laser sensors are available in protection class 1 or 2. However, it is advisable to wear safety goggles when working with high-power lasers.
Consider which range and accuracy are required. For example, applications in automotive production often require sensors with high precision and fast response times.
Maintenance depends on usage. In general, the sensor should be checked regularly for contamination and cleaned if necessary. In industrial environments, quarterly maintenance may be advisable.
Laser sensors are used in a wide variety of fields such as material processing, robotics and the construction industry. For example, they are used in wood processing to measure distances between machines precisely.
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