① No need to measure reflectivity of inner wall

② Two integrating spheres have no influence on each other

③ Calibration of system is easier and experimental device is simpler

④ Lower cost

① Low measurement accuracy

② Can only be measured in steps

③ Sample cannot be illuminated diffusely in transmission geometry

① Most accurate method at present

② Suitable for layered structure organization

③ Diffuse reflectivity and diffuse transmittance can be measured at same time

④ Sample can be illuminated by diffuse reflection in transmission or reflection geometry

① Demand for stability of light source is very high

② It is difficult to implement and calibrate

③ Price is relatively high

① It is only suitable for in vitro measurement

② Scope of application is narrow

① Measurement accuracy is higher

② Micro-areas can be measured

①Experimental conditions specified in model must be strictly met

②Error is large for plane medium with multiple scattering

①Can use computer-aided means

②High flexibility and accuracy

① Scattering is obviously stronger than absorption

② Relationship between optical parameters and measured parameters is an implicit function

① It only aims at one-dimensional diffuse radiation that scattering far exceeds absorption.

② Theoretical model is not perfect

① Samples with differences in refractive index at boundary

② Samples with multi-layer properties

① Theoretical model is more perfect

② Non-destructive measurement

① Iterative solution can be obtained quickly with help of computer

② Anisotropic scattering and internal reflection at boundary can be flexibly included

③Result is very accurate when illumination diameter is less than sample diameter

① Recognized as most accurate measurement method at present

② Loss of light at edge of sample can be accurately calculated