Detection device for detecting macro-defects in infrared glass

Abstract

The invention discloses a detection device for detecting macro-defects in infrared glass, wherein an infrared light source, a circular tube, infrared transmitting flat ground glass, an infrared lens and an infrared planar array imaging detector are arranged in sequence; a detected infrared glass sample is placed between the infrared transmitting flat ground glass and the infrared lens; the inner wall of the circular tube is black and provided with screw threads capable of eliminating parasitic lights; the ratio phi1 / phi2 of the inner diameter phi1 of the circular tube to the diameter phi2 of the detected infrared glass sample is larger than or equal to 1 / 3 and less than or equal to 1, and the ratio L / phi1 of the length L of the circular tube to the inner diameter phi1 of the circular tube is larger than or equal to 5; the infrared light source, the infrared lens and the infrared planar array imaging detector share one optical axis; an adjustable power supply supplies power to the infrared light source; the infrared planar array imaging detector is connected to an image processing module; the image processing module is connected to a display; and the device uses a transmission imaging method, and can fast shoot detective images in the glass. The device provided by the invention has the advantages that the structure is simple, the cost is low, the operation is fast and convenient, the internal defects of infrared glasses with inner diameters from several to dozens of millimetres can be detected, and the adaptability to the thickness change of the glass is strong.

Description

technical field [0001] The invention relates to glass detection equipment, in particular to an infrared glass internal macro defect detection device. Background technique [0002] Infrared glass has good infrared optical properties, such as easy adjustment of glass components, wide transmission spectrum range, large difference in refractive index and germanium single crystal, and easy to form an achromatic lens group with germanium lenses. Therefore, it is widely used in military and civilian applications. The scope of application of infrared glass is more and more extensive, and the requirements for the quality of infrared glass materials are also increasing. Macroscopic defects inside the glass (such as streaks, cracks, crystallization, phase separation, bubbles, etc.) have become one of the key indicators to determine the quality of infrared glass. Uniformity, and thermal inhomogeneity caused during the solidification forming process. [0003] At present, some patents a...

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Problems solved by technology

If the optical interference detection method is used, the device is more complicated, and the pollution of the glass window, the vibration of the experimental system, the defect of the optical instrument, and the unevenness of the brightness of the lighting source will introduce noise, and the operation is inconvenient.

Moreover, infrared glass works in the near-infrared to mid-far infrared band, and has a longer wavelength. It is used for infrared imaging to allow the non-uniformity of the infrared wavelength limit. It is not very suitable to use interferometric measurement methods with high precision.

Another example is that some patents or documents use visible light sources to detect internal defects of visible light glass. This method also has problems in the detection of internal defects of infrared glass, because for many infrared glasses that are opaque to visible light, visible light sources cannot illuminate. Internal Defects of These Infrared Glasses

[0004] To sum up, there is currently a lack of detection devices for macroscopic defects inside infrared glass in China

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