Laser sensor pdf

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AccuProfile Ordering Sheet. TeraTerm — download for free. Variations in target position and orientation can cause the spot where the laser hits the target to change, resulting in incorrect detection. Position Adjustment tool tracks misaligned targets.

The camera follows the position, orientation, and placement of the target, making it possible to identify the target location for every target. IL Series CMOS multi-function analog laser sensors are reflective laser displacement sensors that provide the best-in-class detection ability and stability at reasonable cost.

Stable detection is possible without tuning for workpiece types or their surface conditions, so the IL Series can be added to production lines to help make setup, changeover, and product changes easier. With a wide-ranging lineup of sensor heads, including high-accuracy models and long-range up to 3. Laser Displacement Sensors. Long Range Laser Displacement Meter.

Laser gauge. Its visible beam spot makes alignment and positioning very easy. Since the light beam is focused, the sensor can be installed without worries about stray light. The major types of laser sensors include reflective, thrubeam, and retro-reflective.

Laser sensors are largely divided into multi-purpose types and distance-setting types. Multi-purpose types are further divided into reflective, thrubeam, and retro-reflective models.

All of these models use a visible laser beam but their detection principles are different. This section describes these models and their detection principles with illustrations.

To detect targets, the sensor emits a laser beam to make it reflect from the surface of the target, and receives the reflected beam to detect the target. The sensor detects targets by sensing whether the laser signal beam emitted from the transmitter is interrupted by the target or not. When the signal beam is interrupted by a target, the light receiving element receives the light reflected by the surface of the target and detects the target. This type of laser sensor contains a laser light emitting element, a receiver lens, and a light receiving element CMOS in the sensor head.

The sensor emits a laser beam to a target and receives the reflected light. Based on the change in the position where the light is received light entry angle , the sensor can detect the change in the distance to the target height or position of the target. When using this principle, the path of the laser beam from the light source to the point of reflection on the target surface to the light receiving element forms a triangle.

Consequently, it is called the triangulation principle method. Unlike light from LEDs or other light sources, the light beam of a laser sensor is visible and travels in a straight line, so the position of the beam spot can be found immediately. Since the mounting position can be determined easily, the time needed for integration or changeover can be reduced greatly when compared with photoelectric sensors.

Unlike light from LEDs or other light sources, the laser beam emitted from a laser light emitting element travels in a straight line. Since the light is visible, the beam spot is easily identified. With a reflective laser sensor, it is possible to visualize whether or not the beam spot is exactly in the desired position. With a thrubeam laser sensor, installation can be done quickly and accurately because it is easy to align the optical axis and determine the detection position.

This brings advantages such as reduced installation work and more precise installation. The laser beam used for laser sensors not only travels in a straight line and has high power, but also does not spread over long distances.

The sensor can maintain a small beam spot even for long distance detection, which can help meet various installation conditions. Laser sensors emit powerful light that does not spread, even over long distances. This means detection is possible far from the sensor head. For example, even when the sensor needs to be mounted at a distance robotic cells, operator interference, high temperatures, chemical splashing, etc.

KEYENCE also provides a wide variety of sensor heads that can be used under various installation conditions, including types offering variable beam spot sizes and those specialized for long-distance detection. By using a light beam from a laser light source that travels straighter than LEDs, laser sensors generate hardly any stray light. They have the advantage of fewer false detections even when installed in narrow spaces inside machines or equipment. Sensors using LED light sources are susceptible to interference from stray light.

When these sensors are installed in narrow spaces inside equipment, false detections may be caused by unexpected reflection. Laser beams do not generate stray light even in narrow spaces. They travel in straight lines to allow detection with small beam spots. It is also possible to install reflective laser sensors in spaces inside equipment to detect targets or to use thrubeam laser sensors to detect and monitor gaps themselves.

Detecting remaining roll of transparent film. The remaining amount of film is detected with a laser beam applied to the side of the roll of film. For roll machines and automatic packaging machines, this ensures proper timing to feed the film base material and prevents problems. Universal Change Detection function that can detect the remaining amount of transparent film.

If there is no background, the roll can be detected in combination with a reflector. Long-distance detection for web tension control. Introducing a position based laser sensor laser displacement sensor allows for consistent loop control during transfer of a sheet or web. KEYENCE offers a lineup of ultra-long range laser displacement sensors that can perform accurate detection even from distances up to mm This range offers flexible installation and ensures stable detection while staying out of harm's way.

Using an image-based laser sensor to detect the heights of parts and materials. The IX Series image-based laser sensor can simultaneously detect height at multiple points along with the presence of parts and materials, without being affected by position deviation of a target.

The sensor can detect up to 16 points within the field of view of In addition to presence detection of multiple bolts on automotive parts, incorrect bolt height can also be checked simultaneously thanks to height differentiation using a laser. The camera can store the characteristics of the target. Even when the target is placed differently, the position is corrected within the image and accurate points can be detected.

Since the detection is based on the difference between the reference height and the height of the target point, both tilting of the target and incorrect part heights can be detected. This is even possible when the target parts have the same color, such as body frames and vibration-damping material.

If ambient light, such as pulse-lighting inverter light or light from a fluorescent lamp, enters the receiver of a laser sensor, the sensor may incorrectly recognize it as reflection of the light it emitted. Alternatively, adjust the angle of the receiver so that it does not receive the ambient light. Also provide as much distance between the ambient light source and receiver as possible.

In some cases, using a direct-current lighting light source may reduce the chance of sensor malfunctions. Transparent objects have high transmission ratios. It is not uncommon to see presence detection of transparent objects fail due to insufficient difference in the received light intensity. Sometimes a slight change in the received light intensity, such as the position of the reflector, can have a negative effect on detection. To solve this problem, mount the sensor so that the optical axis is angled toward the entry direction of the transparent object instead of perpendicular to the entry direction.

This makes the shaded area larger and the receiver less likely to receive specular reflection from the target. This should result in a sufficient difference in received light intensity to detect the presence of the target.

When using a retro-reflective model, selecting a model with a large spot size can reduce the variation in the amount of reflected light caused by the reflector position. If the detection requires identifying a subtle difference in light intensity, using a separate amplifier model to visualize the received light intensity will make it easier to determine the best settings on site.

It can also help to use an amplifier that is capable of automatic correction of setting values. Mirrored targets tend to cause specular reflection of light. When the tilt of the target changes, the laser beam traveling in a straight line may not return properly to the receiver, resulting in insufficient received light intensity.