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Polarized Light/Dispersion Microscope

Microscopes for dispersion staining allow for qualitative analysis and identification of asbestos

Polarized light microscopes can measure the properties of asbestos, such as refractive indices, birefringence, retardation, extinction angles, pleochroism and signs of elongation, helping in the identification of asbestos. LV100ND POL/DS is a high-performance, polarized light microscope with accessories that enable dispersion staining observation at up to 400x magnification.

Download LV100ND POL Brochure (1.2MB)


Key Features

Highlights

  • The LV100ND POL/DS employs optics with high extinction factors, facilitating detection and observation of high-precision optical properties.
  • The LV100ND POL/DS enables analysis of birefringence, extinction angles, signs of elongation, refractive indices, birefringence magnitudes, and pleochroism of asbestos.
  • Changing the objectives and PH modules allows observation of asbestos dispersion colors corresponding to the refractive indices of the immersion liquid. The LV100ND POL/DS enables both quantitative analysis and dispersion staining observation of asbestos.
  • A fully rotatable circular graduated stage offers trouble-free sample rotation and accurate analysis during polarization observation.

Birefringence

Mixture of rock wool and chrysotile

The cross Nicols, diagonal position

The cross Nicols, extinction position


Extinction angle

Amosite

The parallel Nicols, cleavage face aligned with the crosshair

The cross Nicols, extinction angle measured


Sign of elongation

Amosite Positive: Subtractive diagonal position

Crocidolite Negative: Additive diagonal position


Refractive index (refraction index of the liquid nD=1.605)

Chrysotile and amosite

The upper part of a specimen is focused

The lower part of a specimen is focused


Retardation (optical path difference) for obtaining birefringence magnitude

Amosite

Diagonal position

Subtractive diagonal position confirmed (a test plate is inserted)

Analyzer rotation angle measured (Senarmont compensator is inserted)


Pleochroism

Crosidolite

Parallel to vibration direction of polarizer

Orthogonal to vibration direction of polarizer


Dispersion colors

Chrysotile
nD = 1.550, red-violet to blue

Amosite
nD = 1.680, pink

Crocidolite
nD = 1.680, orange to red ocher