Yes, there are methods and devices available to measure the absorption, transmission, and reflection of materials in the infrared (IR) spectrum. These measurements are typically performed using specialized instruments known as spectrophotometers or infrared spectrometers.
Transmission Measurement: A transmission measurement involves passing infrared light through a material and measuring the amount of light that is transmitted. This is typically done using a transmission spectrophotometer or an infrared spectrometer equipped with a transmission accessory. The instrument directs the IR light through the sample, and the detector measures the intensity of the transmitted light. By comparing the intensity of the transmitted light with the incident light, the instrument can determine the material's transmittance.
Reflection Measurement: Reflection measurements in the infrared spectrum are performed using reflection spectrophotometers or infrared spectrometers equipped with reflection accessories. These instruments direct infrared light onto the surface of the material and measure the intensity of the reflected light. By comparing the intensity of the reflected light with the incident light, the instrument can determine the material's reflectance.
Absorption Measurement: Absorption measurements are typically obtained indirectly by subtracting the transmitted or reflected light from the incident light. In transmission measurements, the absorption is calculated as (1 - transmittance), while in reflection measurements, it is calculated as (1 - reflectance). The absorption spectrum provides information about how much infrared energy is absorbed by the material at different wavelengths.
It's important to note that the specific wavelength range of 800 nm to 20 μm falls within the near-infrared (NIR) and mid-infrared (MIR) regions, respectively. Different instruments may have different wavelength ranges and resolutions, so it is necessary to choose an instrument that suits the specific requirements of your measurements.
Spectrophotometers and infrared spectrometers are available from various manufacturers and can be found in research laboratories, industrial settings, and specialized testing facilities. Consulting with scientific instrument suppliers or experts in the field will help you choose the most suitable equipment for your specific needs.