What is telecentric lens system?

What is telecentric lens system?

Telecentric lenses are designed to have a constant magnification regardless of the object’s distance or location in the field of view. This attribute is ideal for many machine vision measurement applications, as measurements of an object’s dimension will be independent of where it is located.

What is telecentric illumination?

A telecentric illuminator increases edge contrast and measurement accuracy by decreasing diffuse reflections from the object. Collimated light rays exit the illuminator and remain collimated as they strike an object’s surface (Figure 2).

Are objectives telecentric?

Telecentricity of an objective essentially means having a orthographic perspective like for an observer at infinite distance. That implies that the chief rays are horizontal left and right of the optical system, and the entrance or exit pupil lies at infinity.

Are microscope objectives telecentric?

The aperture stop in a microscope is located at the back focal plane of the microscope objective. This makes the microscope objective telecentric in object space. Therefore, in microscopy, the object is observed with constant magnification, even for defocused object planes.

Are microscopes telecentric?

Is a microscope objective telecentric?

Microscope objectives are also sometimes made object-space telecentric. That avoids the apparent sizes changes of out-of-focus planes in thick specimens.

What are telecentric lenses used for?

Telecentric Lenses. Telecentric lenses are designed to have a constant magnification regardless of the object’s distance or location in the field of view. This attribute is ideal for many machine vision measurement applications, as measurements of an object’s dimension will be independent of where it is located.

What is the difference between LSM and telecentric scan lenses?

Thorlabs’ LSM scan lenses are optimized for Optical Coherence Tomography (OCT) laser scanning imaging systems. Telecentric scan lenses are crucial for OCT and other laser scanning imaging systems, as they produce a flat imaging plane as a laser beam is scanned across the sample.

What is a telecentric scan lens path?

A telecentric scan lens path can also maximize the captured scattered or emitted light from the sample (the signal) into the detection system. In addition, the spot size and shape vary minimally over the entire FOV (see S pecs tab), which results in nearly constant image resolution.

What is the height of the two screws in telecentric imaging?

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.