Spectrometry: general spectrometry

A wide range of applications in research & development and in-line production demand highly accurate analysis of light or reflection of light. Analysis by means of luminance measurements and tristimulus colorimeters may not always reveal all required information. Spectrometry, sometimes known as spectroscopy, allows detailed data regarding the composition of light per wavelength. By dispersing a light beam via a prism or grating, the amount of energy at individual wavelengths can be measured. Spectral information can for example be used to determine spectral power distribution, presence of undesired wavelengths, colour rendering properties of light sources or transmissive/reflective properties of materials. This is generally considered as regular spectrometry. Admesy offers different types of spectrometers, each serving specific needs for R&D and in-line production measurements.
Spectrometry can be described as the study that focuses on the analysis of light by dispersing light beams into individual wavelengths. This analysis is typically done with a spectrometer: an instrument which is capable of determining the composition of light.

By dispersing the incoming light via a grating into individual wavelengths, the proportions of each wavelength can be measured. Besides the visual range [VIS], which can be seen by the human eye,  Admesy also offers products measuring  from ultraviolet [UV] to Near-infrared [NIR]. The picture below shows an overview of different wavelengths.

Filter wheel

Light analysis by means of spectrometers is typically expressed in spectral graphs which represent the spectral power distribution. The picture below shows the spectral power distribution of several  “white” Light sources using a calibrated spectroradiometer.


Admesy offers different spectroradiometers each serving specific needs for R&D and in-line measurements. The table below gives an overview of different parameters and corresponding measurement devices. These applications do not only cover display and lighting measurements, but also transmission and reflection measurements.

Spectral measurements
Rhea  Hera Cronus
 Colour analysis X X X
 Dominant & Peak wavelength X X X
 Luminance & Illuminance X X X
 Luminous intensity Cosine corrector Cosine corrector Cosine corrector
 Luminous flux  Combined with sphere Combined with sphere Combined with sphere
 PAR  Cosine corrector  Cosine corrector  Cosine corrector
 Low luminance X