What is a telecentric lens used for?

Because their images have constant magnification and geometry, telecentric lenses are used for metrology applications, when a machine vision system must determine the precise size of objects independently from their position within the FOV and even when their distance is affected by some degree of unknown variations.

How do I choose a telecentric lens?

Having fixed working distance and aperture, telecentric lenses are classified by their magnification and image circle. Choosing the right telecentric lens is easy: we must find the magnification under which the image fit the sensor.

What is machine vision lens?

TAMRON’s fixed-focal lenses for machine vision are thoroughly designed for industrial, traffic, and medical applications. Their optical excellence paired with compact, ruggedized housings, and comfortable locking features makes TAMRON the first choice for experienced vision system designers.

Where do you need to locate the aperture stop of an optical system to make it telecentric in image space?

For the image-space telecentric system, the exit pupil of this system at infinity. The easiest way to make an image-space telecentric system is placing the stop aperture at the front focal plane and maintain the exit pupil at infinity.

How are bi telecentric lenses used in Thorlabs?

Thorlabs’ telecentric lenses are all bi-telecentric designs. Figure 2 shows an example ray trace through a bi-telecentric lens and illustrates how the chief rays pass through the system. Figure 2: A ray trace through an idealized bi-telecentric lens system.

How does a telecentric scan lens work?

Telecentric scan lenses produce a flat image plane and a spot size that suffers minimal distortion as the angle of the incident beam with respect to the optical axis of the lens is varied; varying the angle of incidence causes the focal spot to scan over the field of view in the image plane.

Can a bi telecentric lens affect magnification?

In a bi-telecentric lens, neither the image nor object location will affect the magnification. Thorlabs’ telecentric lenses are all bi-telecentric designs.

How tall are the screws in a telecentric lens?

With the telecentric imaging system (Fig. 4), the height of the two screws appears to be the same, even though the object planes are separated by approximately 45 mm along the optical axis.