Still the Best Alternative: Optical Sensors

When it comes to automation, we know that good, better and best are based on your unique needs.

Due to the recent increase in competition and efficiency increase targets, all users want to overcome the sensor-related problems they experience. They are looking for another solution, especially instead of previous generation detection methods such as limit switches and proximity, which have contact or very close detection methods. At this point, we thought that photoelectric sensors were the best alternative for the solution and that it would be useful to provide more information on the subject.

What is a photoelectric sensor?

Photoelectric sensors are devices that produce signals based on a change in the intensity or angle of the returning light, using infrared, red LED or laser light to detect the object through various technologies. It can detect the absence or presence of the object, its color and distance.

Photoelectric technology provides long- and short-range detection and can detect almost any material, including glass, metal, plastic, wood and liquid. Sensing distance ranges are far ahead of inductive, capacitive, magnetic and ultrasonic technologies.

Additionally, compared to limit switches, photoelectric sensors do not have moving parts or require contact, nor do they suffer from wear and tear over time.

Photocells: The most commonly used photoelectric sensors are photocells. LED light sources and a photodiode as a receiver enable detection by controlling the light reflected back to the receiver. Since it is affordable compared to other photoelectric sensors, it is used as a standard in non-contact detection.

New generation micro photocells are increasing their use in assembly machines every day, thanks to their small size and detection capabilities.

Fiber Optic Sensors: Fiber optic sensors have various advantages over photoelectric sensors due to their miniature size, flexibility and resistance to harsh conditions. The use of fiber optic sensors in environments with excessive vibration, excessive oil, high ambient temperature or high magnetic field provides detection without being affected by these environmental factors.

In addition, in cases where specially shaped light spots are needed for difficult detection applications, you can easily find solutions with hundreds of sensor cable alternatives.

The new generation of fiber sensors have a detection distance that is 1.5 times longer than previous models, and the minimum detectable object size is ten times smaller. The best-performing Omron E3NXFA series fiber sensor in the world easily solves challenging applications. It also allows you to make settings with a single button.

Laser Sensors: Laser sensors have better operating limits and detection ranges than LED-based photoelectric sensors, allowing them to detect smaller objects in tight spaces. Thanks to the compact laser beam, laser photoelectric switches are ideal for applications where the precise detection of small objects, features or edges and aiming of the laser beam through small holes or apertures is required: The laser light is easily visible light spot - simplifies alignment and offers longer ranges with reflex and beam photoelectric switch variations.

The laser sensor facilitates its applications with a wide range of detection modes and simplified sensitivity adjustment

Distance-based laser distance sensors allow you to make direct measurements with very high precision. Laser distance sensors also provide analog and digital data output for measurement.

Photoelectric sensors; It can detect objects from the longest distance compared to inductive and capacitive sensors. However, it is the type of sensor most affected by environmental conditions such as dirt and debris, so review the application carefully.

Options such as smaller or adjustable linear spot diameter and developments in cmos image cells allow you to guarantee precise detection and measurement independent of color and material. Omron E3NC series laser sensors are the smallest CMOS embedded laser sensors in the industry.

All of the above products belong to OMRON's new generation detection system N-Smart.

The N-Smart series features sensors with stable detection capability and open network connectivity with optimum cost performance. It contributes to increasing continuity and efficiency by providing information to the controller. We have examined this issue in detail in another blog.

When choosing a sensor, consider these key considerations:

• object to be detected
• Background and objects to ignore
• Installation space restrictions
• Sensor mounting method
• Electrical connections and wiring

Knowing the product to be detected helps determine which type of sensor should be used. However, it is very important to remember that the sensor can also detect the background behind the product or a person or object passing behind.

Need help finding the right solution?

When it comes to automation, we know there's good, better and best based on your unique needs. We can help you find the right solution.