Rowland circle

Rowland circle

[′rō‚lənd ‚sər·kəl]
(spectroscopy)
A circle drawn tangent to the face of a concave diffraction grating at its midpoint, having a diameter equal to the radius of curvature of a grating surface; the slit and camera for the grating should lie on this circle.
References in periodicals archive ?
c) Diffraction from the grating to the image plane (along the Rowland circle) according to the wavelength.
The grating center point [P.sub.i], the input position I and the center output position O are chosen to be on a circle (called the Rowland circle).
ARCOS stands for Advanced Rowland Circle Optical System.
The ARCOS is one of the few Rowland Circle ICP systems on the market.
Curved diffraction gratings designed in a Rowland circle configuration have the property that a source located on the Rowland circle will be imaged on the circle at a location dependent on wavelength.
The instrument uses 32 linear CCD detectors in an optimized Paschen-Runge mount ORCA (Optimized Rowland Circle Alignment) for simultaneously recording the wavelengths between 130 and 770 nm.