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Telecentric lens There are two types of telecentricity: object-side and image-side telecentricity (referring to the positions of the entrance pupil and exit pupil respectively). Therefore, telecentric lenses are divided into: object-direction telecentric lenses, image-direction telecentric lenses, and bi-telecentric lenses.
1. Object-side telecentricity
In the general sense, a mechanical vision telecentric lens refers to an object-side telecentric lens. If the entrance pupil of the lens is located at infinity in the image side (all objects behind the objective lens) position (as shown in Figure 2), it can be called an object telecentric lens.
Figure 1. Object-space telecentric lens with the entrance pupil projected to infinity on the image side
In optical design, RW Escorts achieves object-direction telecentricity by placing the system’s aperture diaphragm at the center of the front group. Since the entrance pupil is at infinity, the field of view is constant regardless of the field angle. Because the chief ray (which defines the system’s field of view) passes through the optical axis at the aperture stop and passes through the entrance pupilThe optical axis means that when the pupil is at infinity, the light ray will be parallel to the optical axis and the field of view is zero (Figure 2). In contrast, any entrance pupil placed at an infinite distance from the lens will result in non-parallel chief rays (as shown in the image traced in Figure 3 for a non-telecentric lens).
Figure 2. An object-space telecentric lens whose chief ray is completely parallel to the optical axis in the object space. Note that the field of view does not change no matter where the object is stereoscopically located because the chief ray that defines the field of view is exactly parallel to the optical axis.
Figure 3. The entrance pupil is located where the principal ray of the object side passes through the optical axis, otherwise Rwandans SugardaddyTelecentric lens shown
2. Image telecentric lens
The object telecentricity is defined by the position of the entrance pupil in the object space. The image telecentricity can be determined by the exit pupil located at infinity within the object space. Definition of ejection pupil. This situation is shown in Figure 4.
Figure 4. Image-side telecentric lens with the exit pupil projected to the image-side infinity
The situation is roughly the same: if the lens is object-side telecentric, the magnification of the object will not Change, if the lens is telecentric in the image direction, the magnification ratio will not change with the three-dimensional position of the sensor (as shown in Figure 5). This means that sensor position tolerances are not as important to the camera as the subject-side telecentric lenses, as RW Escorts Small offsets will not Rwanda Sugar cause magnification differences between two systems with the same lens.
Figure 5. Image telecenter when the main lightRwandans Sugardaddy line is completely parallel to the optical axis in the image lens. Please note that no matter where the sensor is located Rwanda Sugar Daddy, the image height will not change, because the main ray and light that define the image height will not change. The axes are completely parallel.
In addition, telecentric lenses do not suffer from the cos4θ attenuation of radioactive measurements because Rwanda Sugar the light rays are perpendicular to the entire area. sensor. This is advantageous because, assuming there is no selective halo built into the lens design, it makes the image absolutely illuminated.The bright distribution is doubled evenly. Image telecentricity is not exclusive to telecentric lenses, as image telecentricity can also be specified in conventional lenses (such as fixed focal length lenses). However, most fixed focus lenses on the market are not designed to be image-centered as they usually require additional components ( Therefore more cost is required) to achieve telecentricity, and depending on the size of the sensor used, a considerably larger diameter may be required. If a non-telecentric lens is telecentric, it will usually be marked.
3. Bi-telecentric lens
Although the object-direction telecentricity can provide much higher measurement accuracy than traditional lenses, if the lens is both object-direction and Rwandans EscortLike fangyuanxin (bi-telecentric), it can also achieve higher accuracy. The same principle of image-side and object-side telecentricity is equally applicable; in a bi-telecentric lens, the entrance and exit pupils project to their respective infinities (as shown in Figure 6).
Figure 6. The entrance and exit pupils Rwanda Sugar Daddy are projected to the image side and object side infinity respectively Bi-telecentric lens at a distance
A bi-telecentric lens is the most correct type of telecentric lens due to its complete field of viewRwanda Sugar Daddy It is not affected by changes caused by changes in object position or sensor position, nor does it suffer any cos4θ attenuation.
Figure 7 shows a comparison of three different lenses – a fixed focal length lens, an object-only telecentric lens and a bi-telecentric lens – with the x-axis showing the task distance (Rwandans Escortmm) compared to the change in the nominal value, the y-axis represents the percentage of dimensional error compared to the actual value.
Figure 7. Comparison of three different lenses (non-telecentric, object-space telecentric and bi-telecentric) and the associated dimensional errors for each lens as the task size changes.
As shown in the figure, the bi-telecentric lens is the most accurate lens in the group, with an error of less than 0.2% when the task interval is offset by 4mm. Bi-telecentric lenses should be used in applications requiring the highest accuracy and precision.
Original title: Monakata Rwanda Sugar Characteristics and differences of telecentric, telecentric and bi-telecentric lenses
Article Source: [WeChat public account: New Machine Vision] continuedTo be added for tracking care! Please indicate the source when transcribing and publishing the article.
Freelance editor: haq
Original title: Characteristics and differences of object telecentric, image telecentric and bi-telecentric lenses
Article source: [Microelectronics Signal: vision263com, WeChat public account: New Machine Vision] Welcome to add tracking and follow! Please indicate the source when transcribing and publishing the article.
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