Laser protective lens, also known as laser window lens and optical window lens, is an optical plane lens that protects electronic components, sensors and semiconductor components in the optical path. Window slice is one of the basic optical elements in optics. It does not change the optical magnification, but only affects the optical path in the optical path. Mechanical properties such as light transmittance, surface accuracy, thickness, parallelism, substrate material are important parameter indexes of window slice.
The laser protective lens is an optical glass plate with two parallel surfaces after polishing. They can be used as protective elements in a variety of complex environments, and their efficient transmittance makes them have little impact on the passing visible light. Commonly used coatings are anti-reflective film (AR) and anti-scratch film (AS), which can also improve the effect according to the needs of customers. They can be waterproof, dustproof and anti-scratch, and can be customized according to customer requirements. Optical window piece is the front protection piece of optical system, mainly used for the packaging of CCD/CMOS chips, the protection of optical instruments, measuring instruments and digital devices, various laser devices, cover pieces on laser diodes, etc.
Basic principle of laser protective lens detection
Various impurities in the optical window must be different from the optical window. When the light enters the optical window, various impurities will be different from the surrounding optical window in terms of reflection and refraction. For example, when the uniform light is perpendicular to the optical window; For example, there is no impurity in the optical window, the emission direction will not change, and the detected light is also uniform; When there are impurities in the optical window, the emitted light will change and the detected image will change accordingly. Due to the existence of impurities, stress concentration and deformation occur around them, and can be easily observed in the image. If light transmission defects (such as cracks, bubbles, etc.) are encountered, the light will be refracted at the defect, and the light intensity is greater than the surrounding, so the light detected on the camera target will be correspondingly enhanced; If light absorbing (such as sand) impurities are encountered, the light position at the defect will become weaker, and the light detected on the camera target will be weaker than the surrounding. The corresponding defect information is obtained by analyzing the intensity and image characteristics of the image signal collected by the camera.