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  2. Transmittance - Wikipedia

    en.wikipedia.org/wiki/Transmittance

    n i is the number density of the attenuating species i in the material sample; ε i is the molar attenuation coefficient of the attenuating species i in the material sample; c i is the amount concentration of the attenuating species i in the material sample; ℓ is the path length of the beam of light through the material sample.

  3. Refractive index and extinction coefficient of thin film ...

    en.wikipedia.org/wiki/Refractive_index_and...

    Reflectance and transmittance measurements of the uncoated glass substrate were needed in order to determine the previously unknown n(λ) and k(λ) spectra of the glass. The reflectance and transmittance of ITO deposited on the same glass substrate were then measured simultaneously, and analyzed using the Forouhi–Bloomer equations.

  4. Transfer-matrix method (optics) - Wikipedia

    en.wikipedia.org/wiki/Transfer-matrix_method...

    Although the scattering length density profile is normally a continuously varying function, the interfacial structure can often be well approximated by a slab model in which layers of thickness (d n), scattering length density (ρ n) and roughness (σ n,n+1) are sandwiched between the super- and sub-phases. One then uses a refinement procedure ...

  5. Collimated transmission theory - Wikipedia

    en.wikipedia.org/wiki/Collimated_transmission_theory

    Spectrophotometry: Quantitative measurement of transmittance based on wavelength. It is important in a number of biomedical fields ranging from the measurement of a solute in a sample to determining enzyme kinetics for a given substrate-enzyme pair. Spectrophotometry requires multiple wavelengths for a wide variety of samples.

  6. OD600 - Wikipedia

    en.wikipedia.org/wiki/OD600

    Spectrophotometer for OD600 and Cell Density Measurements. OD600 (Also written as O.D. 600, D 600, o.d. 600, OD 600) is an abbreviation indicating the optical density of a sample measured at a wavelength of 600 nm in 1 cm light path (unless otherwise stated).

  7. Particle-size distribution - Wikipedia

    en.wikipedia.org/wiki/Particle-size_distribution

    Typical apparatus disperses the sample in liquid, then measures the density of the column at timed intervals. Other techniques determine the optical density of successive layers using visible light or x-rays. Advantages: this technique determines particle size as a function of settling velocity.

  8. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/.../1951_USAF_resolution_test_chart

    A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.

  9. Densitometry - Wikipedia

    en.wikipedia.org/wiki/Densitometry

    Optical density is a result of the darkness of a developed picture and can be expressed absolutely as the number of dark spots (i.e., silver grains in developed films) in a given area, but usually it is a relative value, expressed in a scale. [citation needed]