Laser Displacement Sensor: Principles and Applications

Abstract: Laser Displacement Sensor is a sensor that measures the distance between a light spot and the sensor using triangulation. By analyzing distance data we can detect presence, displacement distance, material stack levels, and more.

1. Principle of Laser Displacement Sensors

A laser displacement sensor measures the distance between a light spot and the sensor using triangulation. The laser is focused and projected onto the object through a transmitting lens. Part of the reflected beam from the object forms a spot on the position detector. When the object moves, the reflected spot shifts on the PSD (position sensitive device) panel. By calculating the change in detected position, the sensor-to-object distance variation can be determined.

When measuring reference distance ① the reflected laser hits the center of the photosensitive element inside the sensor. For a shorter distance ② the reflected beam strikes a lower point ② on the photosensitive element. For a longer distance ③ the reflected beam strikes an upper point ③. Because the receiving point corresponds one-to-one with the measurement distance (the emission point, measurement point and receiving point form a specific triangle), the measuring point position can be computed from the receiving point location.

2. Common Applications of Laser Displacement Sensors

Laser displacement sensors offer high measurement accuracy, fast response, and strong stability. Below are several common applications in automation:

* Measuring roll material height

Laser displacement sensors can measure roll thickness to determine material usage.

* Detecting package box height

They accurately detect the height of boxes on conveyors, determining whether items are standing upright or lying flat.

* Measuring PCB component height

Laser displacement sensors can stably measure component heights on PCBs without being affected by different materials.

* Checking whether bottle caps are tightened

By measuring the overall bottle height (with cap) and comparing with the standard height, the sensor determines whether caps are properly tightened.

There are many laser displacement sensor types on the market. For example, Atonm offers five laser displacement models: LD1-H030, LD1-H050, LD1-H100, LD1-H200, and LD1-H400. Atonm laser displacement sensors provide high accuracy, fast response and strong stability. For detailed product information and usage instructions, click the links below:

1. Laser Displacement Sensor LD1-H030

2. Laser Displacement Sensor LD1-H050

3. Laser Displacement Sensor LD1-H100

4. Laser Displacement Sensor LD1-H200

5. Laser Displacement Sensor LD1-H400

Atonm laser distance sensors are widely used in automotive, home appliances, PCB, industrial robots, lithium batteries, 3C electronics, mobile phone manufacturing, metal packaging and other fields, and will continue to expand into new application areas.

Common application scenarios include:

1. Measuring sheet material bending

   
   

2. Measuring substrate warp

3. Measuring remaining roll material

4. Detecting presence of micro gaskets

5. Controlling placement head and workpiece height

6. Measuring screw insertion depth

 7. Determining casting orientation

8. Measuring component thickness