Spectroscopy Concepts

Our spectrometers are flexible systems that allow for a large number of configurations, which provides the optimization of the optical and spectroscopic performance for a specific application. The optical components such as the entrance slit, diffraction grating, or detector can have a strong influence on the sensitivity, optical and digital resolution, and stray light of the spectrometer. In this section, we provide you with some useful information about how our spectrometers work and how to choose the ideal optical components to achieve maximum performance and sensitivity on your spectrometer.

What is Spectroscopy?

Optical component with a periodic structure (groove density) that splits and diffracts the incoming beam into its component wavelengths. It is an important component to outline the operational wavelength range of the spectrometer.

Optical Resolution

The parameter that is measured as full width at half maximum (FWHM) and depends on the diameter of the collection optical fiber, entrance slit width, groove density of the grating, and the number of detector elements. 


The sensitivity of a spectrometer is a measure of how the optical input (light that enters the spectrometer) relates to the spectral output (counts that are registered in the graphical display of the software).

Stray Light

The light that unintentionally scatters within the spectrometer and reaches the wrong part of the detector, originating a false reading. Absorbance and transmittance values are affected by stray light percentage inside the spectrometer.

Digital Resolution

The digital resolution of a spectrometer is obtained from an analog to digital converter. This component is responsible for converting the voltage produced by the incident photons, which produce electrons, in the detector pixels into a digital signal that is sent to and processed by the computer for graphical display.