Relative Diffuse Reflectance Measurement
Diffuse Reflectance Measurement
Since light cannot penetrate opaque (solid) samples, it is reflected on the surface of the samples. As shown in the figure, incident light reflected symmetrically with respect to the normal line is called "specular reflection," while incident light scattered in different directions is called "diffuse reflection."
With integrating spheres, measurement is performed by placing the sample in front of the incident light window, and concentrating the light reflected from the sample on the detector using a sphere with a barium sulfate-coated inside. The obtained value becomes the reflectance (relative reflectance) with respect to the reflectance of the reference standard white board, which is taken to be 100%.
When light is directed at the sample at an angle of 0°, specular reflected light exits the integrating sphere and is not detected. As a result, only diffuse reflected light is measured. Models of integrating spheres with different angles of incidence are available, enabling measurement of both specular and diffuse reflected light in instances such as these.
News / Events
Shimadzu has released the AIRsight, Infrared/Raman Microscope
Raman and FTIR microscopy in perfect harmony. Infrared and Raman Microscope based on a combination of two analytical techniques to provide complementary molecular information. The AIRsight system improves the efﬁciency of analytical operations by making it easy to perform all process steps from sample observation to data analysis.
In order to reduce plastic waste, the development of eco-friendly alternative materials is being promoted. As an alternative, biomass plastics and biodegradable plastics are becoming more widely available. Biodegradable Plastics are plastics that are decomposed into low-molecular compounds by microorganisms in the environment. So they break down easily in nature, which is an opposite characteristic of petroleum-based plastics.
Various instruments are used for the appraisal of precious stones. These instruments are not limited to general gemstone appraisal tools such as the stereoscopic microscope, but also include various analytical instruments.
Shimadzu has released the IRXross
The IRXross™ creates a new concept for infrared spectroscopy. It offers the optimal solution for a new era with diverse application requirements.
UV TALK LETTER Vol. 22 is now available.
Shimadzu has released the Guide to Biopharmaceutical Solutions