Double telecentric lens is a special type of industrial lens which plays an important role in the field of machine vision and precision measurement. The design principle of the double telecentric lens is that two pieces of optical material with different refractive indices and dispersion properties are precisely bonded together to make industrial lenses, which can reduce or eliminate perspective errors.

Perspective error is caused by the refraction of light and changes in angle of view, which will lead to distortion and distortion of the captured image. In conventional industrial lenses, perspective error occurs due to the relative position between the lens and the image sensor. However, the design principle of the double telecentric lens can effectively eliminate such errors.

The design principle of the double telecentric lens is that, in the longitudinal and horizontal direction, the image obtained by shooting in both the horizontal and vertical direction has no perspective distortion, and it can be within a certain object distance, the magnification of the image obtained by shooting will not change, thus eliminating the perspective error.

Double telecentric lens has the following advantages:

1. Low imaging distortion rate, high resolution, stable play in the small defects high-precision detection scene;

2. No parallax, large depth of field, constant magnification, which can achieve clear imaging of the edges of workpieces in different positions and at different heights;

3. Extremely low telecentricity, focusing error, stray light elimination double guarantee.

Double telecentric lens plays an important role in the field of machine vision and precision measurement, it can eliminate perspective errors, provide high stability and high resolution images, adaptable and cost-effective. For some application scenarios that require high-precision measurement and identification, double telecentric lenses are an excellent choice.