The image below shows a UV-Visible spectrophotometer. Such instruments come in either single or double beam configurations, referring to the way in which the ratio of the incident and transmitted light intensities through the sample is determined. Both types of spectrophotometer consist of one or more light sources, a wavelength selector, a sample compartment, and a dectector (immediately to the right of the sample compartment). Click on the different parts of the instrument, or use the links below, for more details.

internals of a uv-visible spectrophotometer Sources Selector Sample Detector

Parts of a UV-Vis spectrophotometer: Light Sources | Wavelength Selector | Sample Compartment | Detector