Concentric-circle reticles place several circles around a common centre for optical centring and radial comparison. They help compare circular edges, projected diameters and the symmetry of a visible field.
Specify optical glass or fused silica, overall dimensions, thickness, pattern-side orientation and the clear aperture. Define transmission, reflectance or optical density at the working wavelength when optical contrast is critical.
Concentric rings make decentring visible as unequal clearance around a circular target. Ring diameters and concentricity define the reference, while magnification determines their equivalent size at the object.
Ring and angle references in lensmetersRings can support centring, projected-size comparison and lensmeter readout. In a lensmeter, the instrument optics define the relationship between ring displacement and prism power; ring geometry alone does not set that value.
Optical references in measuring instrumentsConcentric-circle reticles place several circles around a common centre for optical centring and radial comparison. They help compare circular edges, projected diameters and the symmetry of a visible field.
Choose this pattern when the feature of interest is circular or when several radial limits must be visible together. Use a central cross or orientation mark when the centre also needs an independent reference.
Concentric rings share one centre. A particle-comparison reticle usually places separate circles of different sizes beside one another. A protractor adds angular readings rather than diameter references.
Circle diameters, radial intervals, line width, centre marks and numbering determine the comparison method. Equal radial steps and equal-area rings create different sampling regions.
A patterned reticle with a defined common centre and ring geometry. Specimen-plane diameter values are established in the working optical arrangement.
Comparison rings for circular features and particle sizes.
Compare round features and concentricity in a viewing field.
No. Annular area grows with radius for a fixed radial interval. Equal-area sampling needs a different sequence of radii.
Yes, but establish the centre first. Otherwise eccentricity can be mistaken for a diameter change.
Only after the optical conversion is established. Calibrate a microscope reticle against a specimen-plane reference.
Concentric circle reticles share one centre across several rings for centring, radial comparison and circular-outline inspection.
Specify each diameter and line width, plus the common centre relative to the datum. Choose the ring sequence for the task.
Ring diameters, spacing, line width, centre mark, mounting datum and active field.
They can use equal spacing or a specified diameter sequence. Define each ring and its intended role in the drawing.