spherometer

A spherometer is a precision instrument used to measure the curvature of spherical surfaces, such as lenses, mirrors, and other optical components. It consists of a small, usually circular, base plate with three adjustable feet or legs, which are arranged to form an equilateral triangle. A vertical stem, typically made of a rigid material like metal or glass, is attached to the center of the base plate. The stem carries a circular scale and a graduated dial or vernier, used to measure the distance between the base plate and the top of the stem.

To use a spherometer, the user places the base plate on the surface being measured and adjusts the feet to level the instrument. The graduated dial or vernier is then read to determine the curvature of the surface. Spherometers are available in various ranges and resolutions, allowing for measurements of both small, precise curvatures and larger, more general curvatures.

Spherometers have been used in the manufacture of optical components, such as lenses and mirrors, where accurate control of curvature is critical. They are also employed in the cleaning and maintenance of precision optical components, ensuring that surfaces remain accurate and intact. Additionally, spherometers have been used in scientific research, particularly in fields such as microscopy and spectroscopy, where precise control of curvature and surface shape is essential.

Spherometers are typically made from high-accuracy materials, such as glass or quartz, and are designed to provide a high degree of precision and stability in their measurements. They are widely used in both industrial and academic settings, where precise control of curvature is required for the manufacture and maintenance of optical components.