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9. Measurement of solid sample
CAUTION
After measurement finishes, wipe up wet and soiled parts of the instrument with tissues
moistened with alcohol or neutral detergent. Moreover, wipe down the whole instrument
with dry tissues to remove moisture completely from it.
For measuring solid samples, use contact liquid, the test piece set or/and polarizing
eyepiece depending on the situation. If the occasion arises, inquire of the store that you
purchased your refractometer from or our distributor for those items referring to the parts
and consumable supplies list on page 43.
Measurable solid samples are limited to transparent matters such as glass, plastic.
Generally measurement of solid samples such as glass, etc. has no need of a constant
temperature circulating bath, because their refractive indices are hardly affected by
temperature change. However, some kinds of plastics whose refractive indices are greatly
affected by temperature change need to use a constant temperature circulating bath.
Fig. 9-1
Polished side or
Glossy side
(Lighting side)
Polished side or
Glossy side
(the surface to contact
the main prism)
Rectangular parallelepipeds of 20 to
30mm long by 8mm bread by 3 to
10mm high are optimum. It is
desired that the lighting side and the
surface to contact the main prism
are polished (if not finished with
optical polish but the surface is plane
and shiny, it has no problem) and the
edge between lighting side and the
surface to contact the main prism
meet at right angles to each other
(Fig. 9-1).
(1) Measuring glass, plastic
samples
(1)-1 Desirable sample conditions
