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Transmission and Diffuse Reflection Spectroscopy

The interaction of light with matter can reveal a great deal of information about the characteristics and nature of your sample material. When electromagnetic energy in the form of ultraviolet, visible or near-infrared light strikes the surface of a material, that energy is transmitted, reflected or absorbed or, most likely, some combination of these. How the light behaves when it hits a surface depends on physical characteristics, structure and chemical properties of the material.

Physical Laws Governing Light Behavior

In analyzing light spectra, there are several well documented scientific principles governing the behavior of light that help us make sense of the collected data. Developing reference standards adds further utility to spectra data, allowing researchers and scientists around the world to share understanding and a common vocabulary.

One of the most common and essential physical law that spectroscopists use is the Beer-Lambert law which explains light attenuation in relation to the physical properties of the sample and states that transmission is proportional to a sample’s optical depth and the concentration of the absorbing species in a material sample.

The modular design and multichannel capabilities of the Avantes line are a benefit in transmission and reflection spectroscopy, enabling broadband coverage from approximately 200 nm through 2500 nm while achieving incredible resolution for target wavelength ranges. We also offer a wide selection of versatile sampling accessories and probes. Discover the right solution for your transmission/ reflection measurement needs with the help of our expert sales engineers today.

Applications for Transmission/Reflection Spectroscopy

Transmission reflection spectroscopy is so prevalent that it is nearly impossible to list even a fraction of the applications researchers have found and it forms the basis of many other spectroscopic techniques. Color measurements are based on reflection spectroscopy and thin film metrology in the semiconductor industry is based on reflection or transmission spectroscopy. We also find transmission reflection measurements at work in biological and life sciences when studying everything from air pollution to the structure of butterfly wings.

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Spectrometers for Transmission and
Diffuse Reflection Spectroscopy

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AvSpec-ULS2048CL-EVO

The StarLine AvaSpec-ULS2048CL-EVO offers you this latest technology using CMOS instead of the conventional CCD technology. In combination with our latest AS-7010 electronics, it offers you a versatile device including USB3.0 communication with 10x higher speed communications and 50x more memory. The AvaSpec-ULS2048CL-EVO is also available as OEM unit, bench-only or rackmount version.

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AvaSpec-ULS2048x64TEC

The SensLine AvaSpec-ULS2048x64TEC backthinned detecor has good sensitivity in the UV and IR regionand .89 mm pixel height maximizes photon collection while the cooling enables long integration times up to 500 seconds with low noise values. three-stage Peltier cooling device integrated into our exclusive ultra-low stray-light optical bench improves the dark baseline and reduces the dark noise by a factor of 2-3.

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Variable Collimating Lens Holder

The variable collimating lens holder is the perfect tool for transmission measurements of samples of various sizes and thicknesses. The vertical bars can be adjusted to samples up to 160 mm thick. Two COL-UV/VIS collimating lenses are included with the variable collimating lens holder.

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Transmission/ Reflection Spectroscopy Resources

Transmission/Reflection Spectroscopy Information Page

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Spectra of the Month Feature: Thin Film Transmission Measurement

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Video: How to Perform a Transmission Measurement

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Related: Color Measurements

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Find the Right Instrument for your
Transmission Reflection Application

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