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Structure and working principle of optical endoscopes

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The structure of the optical endoscopeThe main body of the optical endoscope's appearance is a slender rod, and its internal structure includes: imaging system, illumination system, mirror body (tubular portion), mirror body (handheld portion), and end components, in which the mirror body plays the role of a protective sleeve, which can enhance the mechanical stability of the entire device, and the internal placement of the lens system as the core, which can include objective lenses, prisms, and so on, in order to In order to meet the needs of the application, the overall length can also be extended through the extension tube screwed to each other. The following diagram shows the structure of the lens system, which also shows the imaging principle.

The working principle of an optical endoscope:



Mainly optical imaging and transmission, specifically the working principle can be summarized in the following steps.

1. Illumination light is transmitted to the surface to be measured (the light source can be fixed on the straight tube of the mirror body, or an external light source can be used to guide the illumination).

2. The reflected light from the surface to be measured is collected by the objective lens.

3. The reflected light is transmitted back through a lens inside the mirror.

4. The operator observes the image through an eyepiece or external observation device.

Application of Optical BorescopeBecause of the features of compactness and flexibility, adjustable viewing direction, and all-round inspection, the optical borescope is good at inspecting narrow spaces or complex holes and crevices. For example, the casting process as a molding process material is usually poured into the casting cavity in a fluid state, and the castings obtained through this molding process may have process-related discontinuity defects, and optical endoscopy can be used to check surface irregularities, wrong shape, shrinkage, casting scars, unfused, underpoured, porosity, cracks, burrs, etc. in the compact structure of the casting. Also like engines, gas turbines, gearboxes . Bolt holes, as well as production assembly and other processes can be observed using optical endoscopy, in civil aviation, petrochemical, hydropower, wind energy, machinery manufacturing, automotive, shipping and other fields have more applications!

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