PolyOneTechie said:I am looking at EMI Shielding effectiveness testing and I would like to measure how a material is shielding Electromagnetic waves, qualitatively. Is there a way to measure how a material is shielding qualitatively and quantitatively (in dB)?
Reflectance and absorbance are both measures of how much light is absorbed or reflected by a substance. Reflectance measures the amount of light that is reflected off the surface of a material, while absorbance measures the amount of light that is absorbed by the material.
Reflectance and absorbance are measured using a spectrophotometer, which measures the amount of light that passes through a sample. The difference in the amount of light before and after passing through the sample is used to calculate the reflectance and absorbance values.
Reflectance and absorbance are inversely related. This means that as one increases, the other decreases. A high reflectance value indicates that a material reflects a lot of light and absorbs very little, while a high absorbance value indicates that a material absorbs a lot of light and reflects very little.
Measuring reflectance and absorbance is important in various fields such as chemistry, biology, and environmental science. It can be used to identify substances, determine their concentration, and understand their properties and behavior.
The data from reflectance and absorbance measurements can be used to create graphs and analyze trends in the behavior of substances. It can also be compared to known values to identify unknown substances or to monitor changes in a sample over time.