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Spectroscopic measurement
What is a spectroscopic measurement?
Light is spectrally separated by wavelength, and the intensity distribution of light for each wavelength is arranged to create a spectrum. Spectra are primarily measured using spectrometers and are graphically represented with intensity (vertical axis) plotted against wavelength (horizontal axis).
In the context of luminescent materials or light-emitting devices, measuring their spectrum is referred to as spectroscopic measurement.
Spectroscopic techniques, such as absorption spectroscopy, emission spectroscopy, and fluorescence spectroscopy, are used to analyze the interaction of light with matter. These techniques provide detailed information about the electronic and molecular structure of materials, enabling the identification of substances and the study of their behavior under different conditions.
Principle of spectroscopic measurement using a spectrometer
Figure 1 illustrates the structure of a spectrometer (polychromator) commonly used for spectral measurements. Light emitted from the measurement target enters the spectrometer through the entrance slit. Subsequently, the collimated light, made parallel by a collimating mirror, impinges upon the grating and is spectrally separated by wavelength. The spectrally separated light then strikes each pixel of the sensor via a focusing mirror, allowing for the acquisition of spectral data.
Figure 1: Structural diagram of a spectrometer (polychromator) using a grating
Figure 2: Example of a spectrum
Spectral measurement examples
Measurement examples of OPAL-Luxe high dynamic range spectrometer
He-Ne laser measurement
This is an example of measuring the He-Ne laser with OPAL-Luxe.
Due to its high dynamic range, it is possible to simultaneously measure the laser’s peak wavelength and other weak lights contained in the laser.
Simultaneous measurement of GaN excitation light, band-edge emission, and fluorescence
This is an example of photoluminescence (PL) measurement when the compound semiconductor gallium nitride (GaN) is excited by a helium-cadmium laser (wavelength 325 nm).
Measurement examples of PMA-12 Photonic multichannel analyzer
Metal halide lamp’s emission spectrum
Chromaticity evaluation of white LED
Temporal change of plasma emission spectrum
Measurement examples of mini-spectrometers
Measurement of visible LED
Example of measuring the emission of a visible LED with the mini-spectrometer C10082MD.
Measurement of white LED and three-color LED
Example of measuring the emission of a white LED and a three-color LED with the mini-spectrometer C10988MA-01.
Fluorescence measurement of quinine solution
Example of measuring a 1000 ppm quinine solution with the mini-spectrometer C10083CA (The buffer solution is dilute sulfuric acid).
Featured Products and Systems
This is a small, multi-channel type spectrometer that has an ultra-high dynamic range in a wide wavelength region.
This is a compact multichannel spectrophotometer that integrates a spectrometer and a high-sensitivity detector. We offer a wide variety of models with different measurement wavelengths and sensitivities.
Mini-spectrometers are small, low-cost spectrometers (polychromators). We offer more than 20 types of mini-spectrometers that cover the wavelength range from ultraviolet to near-infrared.
Light sources lineup
The Laser-Driven Tunable Light Source (LDTLS™) is a compact, fully integrated and highly stable tunable broadband light source based on proven Laser-Driven Light Source (LDLS™) technology.
The Chromatiq Spectral Engine™ (CSE) is a sophisticated light source capable of matching real-world lighting conditions, emulating illuminant standards, and creating custom spectra.
Other measurement methods
- Confirmation
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