UV-Vis

A monochromator isolates a narrow band of wavelengths from broadband light; the Czerny-Turner layout is the industry standard for compact UV-Vis instruments.

Diffraction gratings use microscopic periodic grooves to disperse light into its component wavelengths, forming the heart of modern spectrophotometers.

Ultraviolet–visible spectroscopy measures how much light a sample absorbs at each wavelength, revealing concentration, purity, and molecular information.

UV-Vis spectrophotometers use two complementary light sources. Here is why both are needed and how the instrument switches between them.

The Beer–Lambert law links absorbance to concentration, making quantitative analysis possible. Here is what it says and where it holds.

Both designs measure absorbance, but they handle the reference differently. The choice affects stability, speed, and cost.