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  7. ECLIPSE LV100-UDM-POL/DS

Polarizing/Dispersion Microscope ECLIPSE LV100-UDM-POL/DS

Polarizing 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. LV100-UDM-POL/DS is a high-performance, polarizing microscope with accessories that enable dispersion staining observation of up to 400x.

  • The LV100-UDM-POL/DS employs optics with high extinction factors, facilitating detection and observation of high-precision optical properties.
  • The LV100-UDM-POL/DS enables analysis of birefringence, extinction angles, signs of elongation, refractive indices, birefringence magnitudes and pleochroism of asbestos.
  • Changing the objective and condenser lenses allows observation of asbestos dispersion colors corresponding to the refractive indices of the immersion liquid. The LV100-UDM-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


Cross polars, diagonal position


Cross polars, extinction position

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Extinction angle

Amosite


Plain polarized light, cleavage face alignedwith the crosshair


Crossed polars, extinction angle measured

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Sign of elongation


Amosite Positive: Subtractive diagonal position


Crocidolite Negative: Additive diagonal position

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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

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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)

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Pleochroism

Crosidolite


Parallel to vibration direction of polarizer


Orthogonal to vibration direction of polarizer

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Dispersion colors


Chrysotile
nD = 1.550, red-violet to blue


Amosite
nD = 1.680, pink


Crocidolite
nD = 1.680, orange to red ocher