Common photoelectric sensors primarily use visible red light, infrared light, and laser light as their light sources, in addition to blue light, green light, and white light. Each light source has its own advantages and disadvantages and is suitable for specific applications.
This type of light source is widely used in sensors. The light spot is visible, large, easy to align, convenient to install and adjust, and affordable, meeting the needs of most applications. The drawback is its relatively low detection accuracy.
Laser light has a small, bright, and concentrated spot size, high energy, good anti-interference properties, and high detection accuracy, making it suitable for detecting small objects and applications requiring high precision. The downside is its higher price. Laser light source sensors are classified into Class I and Class II lasers. Class I lasers are safe for humans, while Class II lasers pose a lesser risk of harm. This means that Class II lasers have higher energy than Class I lasers. Therefore, when using photoelectric sensors with Class II lasers, avoid staring directly at the lens for extended periods.
Infrared LEDs and receiving elements exhibit strong responsiveness and high efficiency to infrared light. Therefore, long-range photoelectric sensors mostly utilize infrared light sources. Within the same product series, infrared light often offers a greater detection distance compared to red light. Infrared light boasts high energy and good anti-interference capabilities, but its invisible spot can make installation and adjustment more cumbersome. However, the "invisible spot" isn't without its drawbacks. Some applications require an invisible spot, such as when workers are constantly nearby, as a visible spot can be uncomfortable. Furthermore, infrared sensors are more suitable for situations where the object being measured has poor reflectivity or where there is significant ambient light interference.
The longer the wavelength of light, the greater its attenuation in water. Utilizing this property, Banner Engineering in the United States developed the QS30H2O, a sensor that uses 1450nm infrared light specifically for detecting the presence or absence of liquids in water.
Given that installation space may be limited in some applications, Banner Engineering in the United States has also developed a fiber optic detection solution. The DF-G3LIR fiber optic amplifier also uses 1450nm infrared light.
Blue light sources are not as widely applicable as red or infrared light. For strongly light-absorbing objects, such as solar silicon wafers, sensors using blue light sources are more suitable.
Banner Engineering's VS8 sensor series features professional blue light source sensors that are small in size and compact in structure, making them perfectly suited for the needs of industries such as solar energy and electronics.
The above light sources are generally used in color mark sensors.
Generally used in color sensors, when a light source of the three primary colors shines on the object being measured, it will reflect different proportions of the three primary colors, thus enabling the identification of subtle color differences.
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