How to stably detect an object using an optical sensor

In order to stably detect various objects using optical sensors in various devices and equipment;

1. understand the types of optical sensors, their detection principles and features,
2. choose optimal optical sensors for the application, and
3. install and use them correctly to maximize their performance.

Especially when using reflective sensors, various application factors affect object detection, such as shape, size, color, surface conditions, and detection distance of the object to be detected, as well as the surrounding environment, such as ambient light.
In general, it is difficult for reflective optical sensors to stably detect (1) low-reflectance objects such as black objects, (2) glossy objects such as mirrors, and (3) transparent objects such as glasses.

"Stable object detection" refers to the state in which the sensor is able to reliably detect objects without malfunctioning, even if various factors related to the amount of light received by the sensor fluctuate within the range assumed in the equipment design.
In other words, it is important that sensors are chosen and used correctly to provide sufficient margin against variable factors. Long-term "stable detection" ultimately leads to improved reliability of devices and equipment.

For more information, see the FAQs for Engineers: Sensors (e.g., Search for "stable detection").

Stable detection with OMRON's reflective sensors!

Two options: light convergent reflective sensors and light diffuse reflective sensors

OMRON's reflective sensor for built-in equipment, B5W series, is a small-sized advanced optical sensor that incorporates a photomicrosensor with optical lens, an LED pulse-driven circuit (modulated light), and a circuit that is less sensitive to ambient light. The B5W series is used in various applications because it can detect objects that were difficult to stably detect with photomicrosensors (photointerrupters) and distant objects.

OMRON's reflective sensors are available in two types: light convergent reflective sensors that are less sensitive to colors and materials of the object to be detected, such as shiny, black, and transparent objects, and light diffuse reflective sensors that can detect distant objects.

1. Light Convergent Reflective Sensor: B5W-LB Series

Light convergent reflective sensors less susceptible to colors and materials
Reliably detect even shiny, black, and transparent objects

Learn more

2. Light Diffuse Reflective Sensor: B5W-DB Series

Super miniature light diffuse reflective sensor capable of detecting a distant object up to 550 mm

Learn more

2. Features of Light Diffuse Reflective Sensor: B5W-DB Series

OMRON's light diffuse reflective sensor B5W-DB series for built-in equipment has the following features:

1) Long distance detection is possible, enabling detection of objects that are far from the equipment.

Sanitary equipment: Touchless switches

Automatic guided vehicles: Obstacle detection

* Click the equipment name for details of application examples.

Depending on where the equipment is installed, if there are background or other objects that should not be detected, the B5W-DB11A1ーA is available with a variable sensing distance.

2) Designed to be less susceptible to ambient light.

* Make sure that the receiver lens of the sensor is not exposed to direct light from outside. And confirm that there is no malfunction due to ambient light in the actual environment before use.

3) Ultra-small and simple shape for easy incorporation into equipment, and screw mountable from four directions, allowing for greater flexibility in structural design of equipment.

This section provides detailed explanations of your challenges and requests and their solution examples, using specific application examples that serve as design tips so that you can effectively use OMRON's built-in type reflective sensor B5W series.

Application Examples 1　　- Use of light convergent reflective sensors -

Example 1-01
Analysis Equipment A

Transparent object detection, etc.

Example 1-02
Analysis Equipment B

Glossy surface detection, etc.

Example 1-03
Coffee Brewer A

Coffee grounds detection

Example 1-04
Coffee Brewer B

Various cup detection

Example 1-05
Drink Server

Touchless switch
(hand detection)

Example 1-06
Vending Machine

Detect cup dispenser door open

Example 1-07
Liquid Food Server

Various cup detection

Example 1-08
Sanitary Equipment A

Touchless switch
(hand detection)

Example 1-09
Dental Clinical Unit

Touchless switch
(hand detection)

Example 1-10
Packing Machine

Various packing film detection

Example 1-11
Printing Equipment

Various printing forms detection

Example 1-12
Automatic Tester

various trays & tapes detection

Example 1-13
Picking System

Touchless switch
(hand detection)

Example 1-14
Parts Transfer Device

Various trays detection

Example 1-15
Solar Cells Transfer Equipment

Detect passing of cassettes

Application Examples 2　　- Use of light diffuse reflective sensors -

Example 2-01
Sanitary Equipment B

Touchless switch
(hand detection)

Example 2-02
Automated Guided Vehicle (AGV)

Detect obstacles

Reflective Sensors Related Contents

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