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Bar Lights for Machine Vision

Bar lights (also line lights) provide flexible bright or dark field illumination. In order to obtain the best possible image of an object, the installation position, the number of lights and the angle of incidence are important. The bar lights are a solution for Machine Vision, industrial automation, robotics and identification applications – manufactured by wenglor.

Illumination Methods

LBA, LBL and LBO Bar Lights

LBT Miniature Bar Light

LBD Bar Light Diffuse

LB9 Bar Light IP69K

Lighting Methods with Bar Lights

Bar lights are most commonly used in one of these lighting methods. However, there are additional techniques that are specified in the respective product section.

Brightfield

By using a bar light as incident light, direct illumination causes reflections on the surface of the object being examined.

Low Angle

Using bar lights at a flat angle enables a contrast to be created at the edges, which allows slight illumination of the surface.

Darkfield

Positioned as a flat aligned illumination, the bar light highlights edges strongly while hardly any light falls on the surface.

LBA, LBL and LBO Bar Lights with Angle Changers for Machine Vision

wenglor LBA, LBL and LBO bar lights can be configured to suit almost any application. Pair the bar lights with the optional ZBAG angle changers to widen the beam angle and have flexibility and control of illumination across the field of view. The direct illuminators have a perfect balance between brightness and homogeneity, allowing the product to be used at both small and large working distances. The bar lights can be operated with high intensity in continuous mode or synchronized to the machine vision camera in strobe mode with increased luminosity (overdrive). They are available with white, red and infrared light.

Machine Vision Bar Lights – Effects and Features

Beam Angle – Functionality of Angle Changers

What Is an Angle Changer?
Angle changers are a special type of diffuser that can be attached directly onto the LBA, LBL and LBO bar lights. By increasing the beam angle, angle changers also diffuse the light and help to achieve a better homogeneity across the field of view.

Rapid feasibility testing for new projects: Quickly and easily identify the best illumination solution with our angle changer
Protected IP65 design integrity: No need to dismantle the product to change the beam angle
Huge flexibility: Attach angle changers to suit many working distances and machine vision applications

Impact on Beam Angle

Narrow
ZBAG001

Medium
ZBAG002

Wide

ZBAG003

Line
ZBAG004

Impact on Brightness

43,500 lux			34,500 lux		17,400 lux		43,000 lux
Measurements made at working distance WD = 500 mm with LBAW201, measured in the middle of the field of view (FoV) – strobe overdrive mode.

Impact on Brightness

Impact on Exposure Time

×2		×2.5		×5		×2
200 μs		250 μs		500 μs		200 μs

×2
×2.5	×5	×2
200 μs
250 μs	500 μs	200 μs

Curve Effect – Creating Excellent Homogeneity

Angle Changers – Tool-Free Mounting

Field of View – Calculating the Illuminated Area

Bar Light without Angle Changers – Illuminating Big Working Distances

Products / Working Distance in m	1	1.5	2	3
Bar Lights 125 mm	20,000 lux	-	-	-
Bar Lights 250 mm	41,000 lux	24,000 lux	-	-
Bar Lights 375 mm	-	28,000 lux	18,000 lux	-
Bar Lights 500 mm	-	-	23,000 lux	11,000 lux

Bar Lights 125 mm
Bar Lights 125 mm	20,000 lux	-	-	-
Bar Lights 250 mm
Bar Lights 250 mm	41,000 lux	24,000 lux	-	-
Bar Lights 375 mm
Bar Lights 375 mm	-	28,000 lux	18,000 lux	-
Bar Lights 500 mm
Bar Lights 500 mm	-	-	23,000 lux	11,000 lux

Special Illumination Method – Creating the Dome Effect

Special Illumination Method – Using Bar Lights for Line Scan

Polarization – Reducing Glossiness

Product	Angle Changer
ZBAG101	Polarized ±10° beam angle
ZBAG102	Polarized ±17° beam angle
ZBAG103	Polarized ±25° beam angle
ZBAG104	Polarized ±9…16° beam angle
ZBAG105	Polarizer alone

Daisy Chain Connection Unit – Direct Connection to the Camera

The LBL and LBO bar lights have three M12 connection options and can therefore be connected directly to the camera or in series with other bar lights. Precise signal synchronization between the camera and the connected bar lights is achieved through a single connection cable, with no additional power supply required. If the camera does not provide sufficient power for the bar light, this can also be supplied via the second M12 connector. The LBL series is particularly suitable for high-speed production lines.

Legend to the figures:
1: Bar light 1
2: Bar light 2
A: Input M12 × 5-pin
B: Output M12 × 5-pin
EC: Control cabinet

: 24 V power connection

: Signal cable

: 24 V power connection + signal

Connection via Control Cabinet

Connection without Control Cabinet

LBT Mini Bar Light with Angle Changers for Industrial Image Processing

wenglor’s mini bar lights from the LBT series offer extremely flexible configuration for applications with limited space. They are characterized by a compact housing, high luminosity and uniform light distribution, making them suitable for both small and large working distances. The LBT mini bar lights can be used either continuously with high intensity or synchronously with the machine vision camera in strobe mode with increased brightness (overdrive). The optional ZBAG angle changers extend the illumination angle, allowing the illumination of the field of vision to be individually adjusted and controlled. The LBT series is also available in various light spectra, including white, red and infrared light.

LBT Mini Bar Lights – Wide Range of Product Highlights

Protection Class IP67 – Robust Against Dirt, Dust and Water

Changing of the Beam Angle – Flexibility in Industrial Image Processing

Definition of angle changer
An angle changer is a special scattered light diffuser that can be mounted directly on the LBT mini bar light. It extends the beam angle and thus improves the light distribution over the entire visual field, resulting in homogeneous illumination.

Quickly check the feasibility of new projects: Angle changers make it easy to find the ideal lighting solution
Protected design integrity according to IP67 standard: No need to disassemble the product to adjust the beam angle
High versatility: The use of angle changers enables different working distances and applications in the field of industrial image processing

Changes to the Aperture Angle

±10° beam angle
ZBTG001

±17° beam angle
ZBTG002

±25° beam angle
ZBTG003

±9…16° beam angle
ZBTG004

Angle Changer – Quick and Easy Installation

Polarization Filters – Avoid Gloss, Mirroring Effects and Reflections

Highly Flexible Cable – Countless Mounting Options

Performance – Powerful Illumination and Integrated Electronics

Linking – Combination of Multiple Bar Lights

LBD Diffuse Bar Light without Angle Changers

wenglor LBD bar lights are highly diffuse illuminators, perfect for diffuse low angle illumination, direct illumination at a close working distance and backlighting of specific features on the field of view. Thanks to integrated current control and flexible mounting options, the lighting is very easy to install and perfect for a myriad of Machine Vision and identification applications. They are available with white, red and infrared light.

Special Illumination Method – Using LBD Bar Lights as Back Lighting

The illumination surface is so diffused it can be used as a back light to create homogeneous transmitted light. This can be applied where the silhouette of an object needs to be inspected. The following sample pictures were captured using one LBDW101 with a working distance of 220 mm.

The stated working distance in this example is the distance from the camera to the sample part.

See samples on the right →

Screw Head

Milk Cap

Circuit Board

Back Light with Aperture f/4

Back Light with Aperture f/8

Illumination Methods – Examples

The shown samples were captured in each illumination method being common for bar lights. The following sample pictures were captured using two LBDW101 with a working distance of 220 mm and an exposure time of 1 ms.

The stated working distance in this example is the distance from the camera to the sample part.

Screw Head

Milk Cap

Circuit Board

Brightfield with Aperture f/2.8

Low Angle with Aperture f/4

Darkfield with Aperture f/4

LB9 IP69K Machine Vision Bar Light without Angle Changers

Waterproof IP69K Washdown Bar Lights

wenglor LB9 bar lights are industrial IP69K illuminators. The food grade enclosure is perfectly suited for environments subject to high pressure, high temperature washdowns containing steam and cleaning chemicals. The barlights are provided with L-brackets that allow 360° mounting, making them easy to install. They are available with red, infrared and white light.

Easy installation
Perfect for food, beverage and pharmaceutical Machine Vision applications
Designed to withstand the harsh chemical cleaning and decontamination
Wide ambient operating temperature range

IP69K Cable Gland

IP69K protection
For harsh environments

Internal Fans

For homogenizing temperatures
For moisture reduction

Ventilation

For pressure equalization
For moisture reduction

Smooth Body

For reducing bacteria
For easy cleaning

Function Principles and Illumination Techniques

	Brightfield	Low Angle	Darkfield	Dome	Back Light	Angle Changer Compatible
LBA Bar Light
LBD Bar Light
LB9 Bar Light
LBT Bar Light
All bar lights are available with red, infrared and white light.

Function Principles and Illumination Techniques

LBA Bar Light
LBA Bar Light	Brightfield	Low Angle	Darkfield	Dome	Back Light	Angle Changer Compatible
LBD Bar Light
LBD Bar Light	Brightfield	Low Angle	Darkfield	Dome	Back Light	Angle Changer Compatible
LB9 Bar Light
LB9 Bar Light	Brightfield	Low Angle	Darkfield	Dome	Back Light	Angle Changer Compatible
LBT Bar Light
LBT Bar Light	Brightfield	Low Angle	Darkfield	Dome	Back Light	Angle Changer Compatible
All bar lights are available with red, infrared and white light.