Optical Flat window sheet is an optical flat plate that plays the role of protecting electronic components / sensors / semiconductor components in the optical path. Window chip is one of the basic optical elements in optics. It is an optical flat plate that plays the role of protecting electronic components / sensors / semiconductor components in the optical path. The window slice does not change the optical magnification, and only affects the optical path in the optical path. Mechanical properties such as light transmittance, surface accuracy, thickness, parallelism and substrate material are important parameters of window slice.
Optical Flat window sheet is an optical glass sheet with two parallel surfaces formed after grinding and polishing. They can be used as protective elements when used between two environments, but they have little effect on the passing visible light. Commonly used coatings include antireflection film (AR) and scratch resistant film (as), which can also improve the effect according to customer needs. They can be waterproof, dustproof and scratch resistant, and can be customized according to customer requirements. Optical Flat window chip is the front protection chip of optical system. It can be mainly used for the packaging of CCD / CMOS chip, the protection of optical instruments, measuring instruments and digital equipment, the cover chip on laser diode, etc.
Basic principle of optical window film inspection
All kinds of impurities in the optical window must be different from the optical window itself in optical properties. When the light enters the optical window, all kinds of impurities will be different from the surrounding optical window in reflection and refraction. For example, when the uniform light is vertically incident on the optical window sheet, if there is no impurity in the optical window sheet, the outgoing direction will not change, and the detected light is also uniform; When the optical window contains impurities, the outgoing light will change, and the detected image will also change. Due to the existence of impurities, stress concentration and deformation occur around them, which is also easy to observe in the image. If light transmission defects (such as cracks, bubbles, etc.) are encountered, the light will be refracted at the defect position, and the intensity of the light is greater than that of the surrounding, so the light detected on the target surface of the camera will be enhanced accordingly; If light absorbing impurities (such as sand) are encountered, the light at the defect location will become weaker, and the light detected on the target surface of the camera is weaker than the surrounding light. By analyzing the intensity change and image characteristics of the image signal collected by the camera, the corresponding defect information can be obtained
