Laser Sensor

A: 1. Different principles Photoelectric sensors are controlled by converting changes in light intensity into changes in electrical signals. Laser sensors first emit laser pulses from a laser emitting diode aimed at the target. After being reflected by the target, the laser scatters in all directions. Part of the scattered light returns to the sensor receiver, is received by the optical system, and is imaged on the avalanche photodiode and converted into a corresponding electrical signal.

2. Different light sources The light source of the photoelectric sensor can be seen in red light and infrared light, but the laser sensor uses laser technology for measurement. The difference here is that the spot of red light and infrared light is large, and it will become larger as the distance increases, which is not conducive to detecting small objects. The light source of the laser sensor is laser. As a light source, the light source will change size with the distance. The difference between laser and ordinary is that the laser spot will be very small. As the distance increases, the spot will also expand, but it is a very subtle change that cannot be seen by the naked eye, so people usually say that the light source of the laser will not expand.

3. Different application fields Laser sensors are mainly used in object detection, such as presence, position, positioning, counting, convex and concave, positive and negative functions, and are widely used in packaging, electronics and other industries. Photoelectric sensors are used in many fields such as position detection, liquid level control, product counting, width discrimination, speed detection, fixed length shearing, hole recognition, signal delay, automatic door sensing, color mark detection, punching and shearing machines, and security protection. In addition, the concealment of infrared rays can also be used as anti-theft alarms in banks, warehouses, stores, offices and other occasions where they are needed.

4. Different costs Laser sensors are also a type of photoelectric sensors. Because the light sources are different, the manufacturing costs are different, so laser sensors and photoelectric sensors are distinguished.

A: Photoelectric sensors are divided into:

1. LED red light sensor;

2. Infrared light sensor;

3. Laser sensor;

4. Fiber optic amplifier sensor composed of optical fiber.

So the laser sensor belongs to the photoelectric sensor. The chip is the same, but the photosensitive material is different.

A: 1. Laser displacement sensors are widely used in industry, science and research. Its main purpose is measurement to obtain accurate measurements of length, distance and surface roughness.

2. Laser displacement sensors can also be used to measure the gap between two planes, such as in the automotive industry or 3D printing to measure the accuracy of parts. In addition, it is also used in dimensional measurement and assembly systems in the aerospace and defense industries.

3. Laser displacement sensors are also used in industrial automation, robotics and machine vision. In these fields, its precise measurement can achieve efficient production and quality control. It is also widely used in the microelectronics and medical equipment manufacturing industries to measure tiny distances between components.

A: 1. Spot size: Large spot: Photoelectric sensors often use red LEDs as light sources, which produce larger spots, making it more convenient to align and adjust the equipment. It is inexpensive and can meet most applications, making it a more commonly used sensor. However, while this large spot design brings convenience, it also comes with certain limitations. The spot will gradually increase with the extension of the distance, with low accuracy and weak anti-interference. Small spot: Small spots are widely used in high-precision positioning occasions. For example, the small spot equipped with a laser displacement sensor is particularly suitable for measuring small workpieces and fine shapes. At the same time, it can also achieve accurate measurement for target surfaces with curvature or irregular shapes. This technology has a wide range of applications, including but not limited to high-precision measurement requirements such as film correction detection and thickness detection.

2. Spot shape: Circular spot: Circular spot helps to maintain the stability and consistency of the light beam, evenly distribute the light, avoid measurement errors caused by irregular spots, enhance signal stability, and adapt to a variety of application requirements. Strip spot: The length is longer and can detect a wider range. It is often used to detect hollow objects to avoid missed detection due to too small a spot. In addition, the strip spot design is suitable for detecting the presence of conveyor belts and PCB boards, and has high response speed and flexibility. Flat-top spot: It has a clear focused spot shape, sharp edges, and uniform energy distribution. It is suitable for occasions that require uniform irradiation, such as laser material processing and plane lighting. Square spot: It is suitable for the detection of mesh materials because the square spot can better capture the details of the mesh structure.

3. Spot type: Visible light spot: There are red light and laser spots. The laser spot is small and concentrated, with strong energy and good anti-interference, which is suitable for high-precision detection. The red light spot provides a visible and easy-to-align light source with good anti-interference and applicability. It is particularly suitable for application scenarios such as reflective plate sensors and small object recognition. The spots of these two light sources are suitable for most basic applications. Invisible light spot: It mainly includes infrared light, ultraviolet light, etc. This type of light cannot be directly captured by the human eye. The advantages are strong energy and good anti-interference. When the reflectivity of the object being measured is poor or the external ambient light interference is large, a sensor with an infrared light source can be used. The disadvantage is that the light spot is invisible, which brings some troubles to the debugging process, and the divergence angle of the light is relatively large, so the light spot size is relatively larger.

A: 1. What to measure

2. External environment

3. Special requirements

4. Components (fiber unit, reflector, lens unit, metal mounting accessories, slit)

5. Transparent objects generally use retro-reflection because light passes through the transparent object twice.