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Optical distortion and telecentricity in telecentric lens Rwanda Sugar: why industrial measurement pays so much attentionRwandans SugardaddyBoth goals?
In the field of machine vision or industrial inspection, ordinary lenses often cannot meet the needs of precise measurement. The core reason is not the resolution, but the stability of geometric imaging.
The two key parameters involved are “Optical Distortion” and “TelecentricitRW Escortsy)”.
Many people have heard of these concepts, but do not really understand their significance in engineering scenarios. The above test Rwandans Escort exam is explained in as clear a way as possible.
Optical distortion: whether the geometric shape can be faithfully restored
Optical distortion describes whether the lens imaging maintains the true geometric proportions of the object being measured.
It is not difficult for ordinary lenses to appear at the edge of the field of view:
Straight-line bends (barrel/pincushion distortion)
The proportion is stretched
Dimensional errors occur with position
This kind of distortion is not a serious problem when shooting images, but it will bring obvious errors in industrial measurements, especially when it is necessary to measure edge characteristics, hole spacing, and contours.
One of the design focuses of telecentric lenses is to control distortion to a very low level so that the proportions within the entire field of view are as consistent as possible.
In other words: You place the object anywhere in the field of view, and the size should remain the same.
Telecentricity: the core indicator that determines “whether the size changes with distance”
Compared with distortion, telecentricity has a more critical impact on measurement accuracy.
Telecentricity measures:
When the position of the measured object (front and rear directionRwanda Sugar) changes slightly, whether the image size remains stable.
Ordinary lenses have an obvious perspective effect, which is what we often call near and far:
If the object is slightly forward, the image will be larger
If the object is slightly backward, the image will be smaller
The camera is harmless when used for “observation”, but it will cause errors that are difficult to eliminate when used for “measurement”. For example, for a 10mm object, at 50cm we measure 10mm, and it becomes 9.8mm at 51cm, which is undoubtedly a catastrophic problem for industrial measurement.
The telecentric Rwanda Sugar lens controls the direction of the principal ray entering the system to make it nearly parallel, thereby obtaining a “perspective-free” imaging feature Rwanda Sugar Daddy. The result is very critical:
Even if the measured object changes its position back and forth, the image size remains almost unchanged.
This means that the measurement results no longer depend on the exact position of the object, greatly improving the repeatability and stability of the results.
Why are optical distortion and telecentricity indispensable?
In real industrial scenarios, measurement errors mainly originate from two types:
① Horizontal geometric inconsistency – corresponding distortion, that is, stretching will occur at the edges of the screen, resulting in measurement errors Rwandans Escort.
② Dimensional drift caused by changes in longitudinal position – corresponding to the telecentricity, that is, the values measured at different distances are Rwandans Sugardaddy different.
If a lens has low distortion but insufficient telecentricity, it will still cause dimensional instability due to distance drift.
On the contrary, if the telecentricity is high but the distortion is large, the geometric outline of the edge area will still be stretched and deformed.
The real value of a telecentric lens lies in its ability to control these two dimensions at the same time.
Why are ordinary lens adjustment methods not enough?
People often ask: Can lens defects be corrected through software correction? Rwandans Escort update, the most basic cannot be processed with one calibration.
Therefore, as long as the following tasks are involved, telecentric lenses are simply “irreplaceable”:
High-precision dimensional measurement
Inspection of workpieces with incompletely fixed positions
Thickness, spacing, contours and other scenes that require high geometric consistency
Industrial automated online mass inspection
In these applications, measurement stability directly determines yield, and yield directly determines cost.
Two sentences to establish a complete concept
Optical distortion: whether the lens can maintain true geometric proportions in the entire field of view.
Telecentricity: Whether the image size can remain stable when the object distance changes.
Industrial measurement has extremely high requirements for them, because what equipment needs is not “clear vision” but “accurate sighting”.
Note: The content and pictures contained in this article were written by the resident author or co-operated with the website to authorize the transcription and publication Rwandans Escort. The opinions expressed in the article only represent the author’s own and do not represent the attitude of electronic enthusiasts. The article and its accompanying pictures are only for engineers’ learning purposes. If there is any inherent copyright infringement or other violations, please contact this site for resolution. Report appeal
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