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. LV100ND POL/DS is a high-performance, polarizing microscope with accessories that enable dispersion staining observation of up to 400x.

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